| Refcode | Title | |
| 2021ApJ...906...50B | Robotic Reverberation Mapping of the Southern Seyfert NGC 3783 | |
| 2021ApJ...906...84O | Systematic Study of AGN Clumpy Tori with Broadband X-Ray Spectroscopy: Updated Unified Picture of AGN Structure | |
| 2021ApJ...906...88F | Fundamental Reference AGN Monitoring Experiment (FRAMEx). I. Jumping Out of the Plane with the VLBA | |
| 2021ApJ...906..125J | The Carnegie-Chicago Hubble Program. IX. Calibration of the Tip of the Red Giant Branch Method in the Megamaser Host Galaxy, NGC 4258 (M106) | |
| 2021ApJ...907...17L | The Metallicity Dependence of the High-mass X-Ray Binary Luminosity Function | |
| 2021ApJ...907...29C | Resolving the Dust-to-Metals Ratio and CO-to-H2 Conversion Factor in the Nearby Universe | |
| 2021ApJ...907...45N | Combined Analysis of X-Ray Spectra of NGC 3227 | |
| 2021ApJ...907...52T | The Early Discovery of SN 2017ahn: Signatures of Persistent Interaction in a Fast-declining Type II Supernova | |
| 2021ApJ...907...67A | A Survey of Active Galaxies at TeV Photon Energies with the HAWC Gamma-Ray Observatory | |
| 2021ApJ...907...76H | Space Telescope and Optical Reverberation Mapping Project. IX. Velocity-Delay Maps for Broad Emission Lines in NGC 5548 | |
| 2021ApJ...907...99S | Bright, Months-long Stellar Outbursts Announce the Explosion of Interaction-powered Supernovae | |
| 2021ApJ...907..112L | The Astrophysical Distance Scale. III. Distance to the Local Group Galaxy WLM Using Multiwavelength Observations of the Tip of the Red Giant Branch, Cepheids, and JAGB Stars | |
| 2021ApJ...907L..18D | The Peculiar Ca-rich SN2019ehk: Evidence for a Type IIb Core-collapse Supernova from a Low-mass Stripped Progenitor | |
| 2021ApJ...907L..28B | Identification of a Local Sample of Gamma-Ray Bursts Consistent with a Magnetar Giant Flare Origin | |
| 2021ApJ...908...17Z | A Study of Gas Entropy Profiles of 47 Galaxy Clusters and Groups out to the Virial Radius | |
| 2021ApJ...908...19B | Black Hole Mass Measurements of Radio Galaxies NGC 315 and NGC 4261 Using ALMA CO Observations | |
| 2021ApJ...908...25B | The Host Galaxy of the Dwarf Seyfert UGC 06728 | |
| 2021ApJ...908...51F | Early-time Light Curves of Type Ia Supernovae Observed with TESS | |
| 2021ApJ...908...61K | Revisiting the Integrated Star Formation Law. II. Starbursts and the Combined Global Schmidt Law | |
| 2021ApJ...908...63G | Search for Radio Remnants of Nearby Off-axis Gamma-Ray Bursts in a Sample of Swift/BAT Events | |
| 2021ApJ...908...75B | The Radio Luminosity-risetime Function of Core-collapse Supernovae | |
| 2021ApJ...908...85M | Observational Evidence for Enhanced Black Hole Accretion in Giant Elliptical Galaxies | |
| 2021ApJ...908..110M | On the Thermally Pulsing Asymptotic Giant Branch Contribution to the Light of Nearby Disk Galaxies | |
| 2021ApJ...908..121E | A Comparison of Star-forming Clumps and Tidal Tails in Local Mergers and High-redshift Galaxies | |
| 2021ApJ...908..143J | The Young Supernova Experiment: Survey Goals, Overview, and Operations | |
| 2021ApJ...908..155M | Spatially Resolved BPT Mapping of Nearby Seyfert 2 Galaxies | |
| 2021ApJ...908..156Y | The Kiloparsec-scale Fe Ka Emission in the Compton-thin Seyfert 2 Galaxy NGC 4388 Resolved by Chandra | |
| 2021ApJ...908..166P | Far-Infrared Line Diagnostics: Improving N/O Abundance Estimates for Dusty Galaxies | |
| 2021ApJ...908..170G | GHOST: Using Only Host Galaxy Information to Accurately Associate and Distinguish Supernovae | |
| 2021ApJ...908..204H | Approximate Bayesian Uncertainties on Deep Learning Dynamical Mass Estimates of Galaxy Clusters | |
| 2021ApJ...908..226H | First Cospatial Comparison of Stellar, Neutral-gas, and Ionized-gas Metallicities in a Metal-rich Galaxy: M83 | |
| 2021ApJ...908..232R | Near-infrared and Optical Observations of Type Ic SN 2020oi and Broad-lined Type Ic SN 2020bvc: Carbon Monoxide, Dust, and High-velocity Supernova Ejecta | |
| 2021ApJ...908..238M | Regulating Star Formation in Nearby Dusty Galaxies: Low Photoelectric Efficiencies in the Most Compact Systems | |
| 2021ApJ...909...19G | VLA Imaging of H I-bearing Ultra-diffuse Galaxies from the ALFALFA Survey | |
| 2021ApJ...909...39G | Optical Variability Power Spectrum Analysis of Blazar Sources on Intranight Timescales | |
| 2021ApJ...909...56L | CO Excitation, Molecular Gas Density, and Interstellar Radiation Field in Local and High-redshift Galaxies | |
| 2021ApJ...909...92M | Lyman Continuum Emission Escaping from Luminous Green Pea Galaxies at z = 0.5 | |
| 2021ApJ...909..100S | The Fast-evolving Type Ib Supernova SN 2015dj in NGC 7371 | |
| 2021ApJ...909..106X | A ΔR ∼ 9.5 mag Superflare of an Ultracool Star Detected by the SVOM/GWAC System | |
| 2021ApJ...909..121M | Looking for Obscured Young Star Clusters in NGC 1313 | |
| 2021ApJ...909..129S | The HectoMAP Redshift Survey: First Data Release | |
| 2021ApJ...909..203M | Tracing Young Star-forming Clumps in the Nearby Flocculent Spiral Galaxy NGC 7793 with UVIT Imaging | |
| 2021ApJ...910...19J | Extended X-Ray Emission in Compton Thick AGN with Deep Chandra Observations | |
| 2021ApJ...910...21R | A Broadband View on Microquasar MAXI J1820+070 during the 2018 Outburst | |
| 2021ApJ...910...44V | A Spatially Resolved Survey of Distant Quasar Host Galaxies. II. Photoionization and Kinematics of the ISM | |
| 2021ApJ...910...60S | The Clusters Hiding in Plain Sight (CHiPS) Survey: Complete Sample of Extreme BCG Clusters | |
| 2021ApJ...910...69S | A Census of the Extended Neutral Hydrogen around 18 MHONGOOSE Galaxies | |
| 2021ApJ...910..103L | On the Observational Difference between the Accretion Disk-Corona Connections among Super- and Sub-Eddington Accreting Active Galactic Nuclei | |
| 2021ApJ...910..121N | On the Color-Metallicity Relation of the Red Clump and the Reddening toward the Magellanic Clouds | |
| 2021ApJ...910..139R | Quantifying Feedback from Narrow Line Region Outflows in Nearby Active Galaxies. III. Results for the Seyfert 2 Galaxies Markarian 3, Markarian 78, and NGC 1068 | |
| 2021ApJ...911...16M | The Distance and Peculiar Velocity of the Norma Cluster (ACO3627) Using the Near-infrared J- and Ks-band Fundamental Plane Relations | |
| 2021ApJ...911...17G | Jet-Accretion System in the Nearby mJy Radio Galaxies | |
| 2021ApJ...911...38R | OH Megamasers in H I Surveys: Forecasts and a Machine-learning Approach to Separating Disks from Mergers | |
| 2021ApJ...911...64W | The Black Hole Mass of the z = 2.805 Multiply Imaged Quasar SDSS J2222+2745 from Velocity-resolved Time Lags of the C IV Emission Line | |
| 2021ApJ...911...65B | The Hubble Constant from Infrared Surface Brightness Fluctuation Distances | |
| 2021ApJ...911..121P | The Location of Young Pulsar PSR J0837-2454: Galactic Halo or Local Supernova Remnant? | |
| 2021ApJ...912....9W | CGM2 I: The Extent of the Circumgalactic Medium Traced by Neutral Hydrogen | |
| 2021ApJ...912...10Z | Time Delay of Mg II Emission Response for the Luminous Quasar HE 0435-4312: toward Application of the High-accretor Radius-Luminosity Relation in Cosmology | |
| 2021ApJ...912...12E | Blow-away in the Extreme Low-mass Starburst Galaxy Pox 186 | |
| 2021ApJ...912...30N | Calcium-rich Transient SN 2019ehk in a Star-forming Environment: Yet Another Candidate for a Precursor of a Double Neutron-star Binary | |
| 2021ApJ...912...41S | The Intrinsic Scatter of Galaxy Scaling Relations | |
| 2021ApJ...912...46B | A Large Fraction of Hydrogen-rich Supernova Progenitors Experience Elevated Mass Loss Shortly Prior to Explosion | |
| 2021ApJ...912...55S | ENISALA. II. Distinct Star Formation and Active Galactic Nucleus Activity in Merging and Relaxed Galaxy Clusters | |
| 2021ApJ...912...88G | Extended X-Ray Emission Associated with the Radio Lobes and the Environments of 60 Radio Galaxies | |
| 2021ApJ...912..155O | The Source of Leaking Ionizing Photons from Haro11: Clues from HST/COS Spectroscopy of Knots A, B, and C | |
| 2021ApJ...912..157R | Extreme r-process Enhanced Stars at High Metallicity in Fornax | |
| 2021ApJ...912..160R | Tully-Fisher Distances and Dynamical Mass Constraints for 24 Host Galaxies of Reverberation-mapped AGNs | |
| 2021ApJ...912L..22C | An Old Stellar Population or Diffuse Nebular Continuum Emission Discovered in Green Pea Galaxies | |
| 2021ApJ...913....3Y | The Cepheid Distance to the Narrow-line Seyfert 1 Galaxy NGC 4051 | |
| 2021ApJ...913....8H | The Merger Dynamics of the Galaxy Cluster A1775: New Insights from Chandra and XMM-Newton for a Cluster Simultaneously Hosting a Wide-angle Tail and a Narrow-angle Tail Radio Source | |
| 2021ApJ...913...17U | X-Ray Constraint on the Location of the AGN Torus in the Circinus Galaxy | |
| 2021ApJ...913...18B | The Cosmic Ultraviolet Baryon Survey (CUBS). II. Discovery of an H2-bearing DLA in the Vicinity of an Early-type Galaxy at z = 0.576 | |
| 2021ApJ...913...37C | Revisiting Attenuation Curves: The Case of NGC 3351 | |
| 2021ApJ...913...55H | Luminous Type II Short-Plateau Supernovae 2006Y, 2006ai, and 2016egz: A Transitional Class from Stripped Massive Red Supergiants | |
| 2021ApJ...913...82T | Deep Observations of CO and Free-Free Emission in Ultraluminous Infrared QSO IRAS F07599+6508 | |
| 2021ApJ...913..105O | The Cluster-central Compact Steep-spectrum Radio Galaxy 1321+045 | |
| 2021ApJ...913..120Z | Cosmological Evolution of Fermi Large Area Telescope Gamma-Ray Blazars Using Novel Nonparametric Methods | |
| 2021ApJ...913..134K | Beyond Simple AGN Unification with Chandra-observed 3CRR Sources at 0.5 < z < 1 | |
| 2021ApJ...914...42B | Radio Counterpart Candidates to Unassociated 4FGL-DR2 Sources | |
| 2021ApJ...914...54Y | Comparing the Inner and Outer Star-forming Complexes in the Nearby Spiral Galaxies NGC 628, NGC 5457, and NGC 6946 Using UVIT Observations | |
| 2021ApJ...914...97C | Improving NASA/IPAC Extragalactic Database Redshift Calculations | |
| 2021ApJ...914..104B | Spectral Observations of Superthin Galaxies | |
| 2021ApJ...915....1C | PGC 38025: A Star-forming Lenticular Galaxy with an Off-nuclear Star-forming Core | |
| 2021ApJ...915...21R | CHAOS. VI. Direct Abundances in NGC 2403 | |
| 2021ApJ...915...25T | Revealing Thermal Comptonization of Accretion Disk Photons in IC 4329A with AstroSat | |
| 2021ApJ...915...34H | The Carnegie Chicago Hubble Program X: Tip of the Red Giant Branch Distances to NGC 5643 and NGC 1404 | |
| 2021ApJ...915...51C | Investigating Cold Dust Properties of 12 Nearby Dwarf Irregular Galaxies by Hierarchical Bayesian Spectral Energy Distribution Fitting | |
| 2021ApJ...915...59Z | The Intrinsic Properties of Multiwavelength Energy Spectra for Fermi Teraelectronvolt Blazars | |
| 2021ApJ...915...83T | Fresh Insights on the Kinematics of M49's Globular Cluster System with MMT/Hectospec Spectroscopy | |
| 2021ApJ...915...98P | Multi-scale Radio and X-Ray Structure of the High-redshift Quasar PMN J0909+0354 | |
| 2021ApJ...915..125S | The Effect of the Angular Momentum in the Formation and Evolution of Low Surface Brightness Galaxies | |
| 2021ApJ...915..126L | The Discovery of a Remnant Radio Galaxy in A2065 Using GMRT | |
| 2021ApJ...915..129K | Taking a Long Look: A Two-decade Reverberation Mapping Study of High-luminosity Quasars | |
| 2021ApJ...915L..33M | Stars Lensed by the Supermassive Black Hole in the Center of the Milky Way: Predictions for ELT, TMT, GMT, and JWST | |
| 2021ApJ...916...21R | Toward Precision Cosmology with Improved PNLF Distances Using VLT-MUSEI. Methodology and Tests | |
| 2021ApJ...916...25R | The Black Hole Mass of NGC 4151 from Stellar Dynamical Modeling | |
| 2021ApJ...916...31M | Radiative Driving of the AGN Outflows in the Narrow-line Seyfert 1 Galaxy NGC 4051 | |
| 2021ApJ...916...73S | A Comparison between Nuclear Ring Star Formation in LIRGs and in Normal Galaxies with the Very Large Array | |
| 2021ApJ...916..102A | The Impact of Low-luminosity AGNs on Their Host Galaxies: A Radio and Optical Investigation of the Kiloparsec-scale Outflow in MaNGA 1-166919 | |
| 2021ApJ...917...18C | Threads, Ribbons, and Rings in the Radio Galaxy IC 4296 | |
| 2021ApJ...917...39K | Detection of a Multiphase Ultrafast Wind in the Narrow-line Seyfert 1 Galaxy Mrk 1044 | |
| 2021ApJ...917L..18P | A Corotating Group of Dwarf Galaxies around NGC 2750 as a Centaurus A Analog | |
| 2021ApJ...917L..33H | Dark X-Ray Galaxies in the A1367 Galaxy Cluster | |
| 2021ApJ...918...23M | Galaxy Properties at the Faint End of the H I Mass Function | |
| 2021ApJ...918...34M | The Final Months of Massive Star Evolution from the Circumstellar Environment around SN Ic 2020oi | |
| 2021ApJ...918...46W | Mass, Spin, and Ultralight Boson Constraints from the Intermediate-mass Black Hole in the Tidal Disruption Event 3XMM J215022.4-055108 | |
| 2021ApJ...918...61C | Dissecting the Strong-lensing Galaxy Cluster MS 0440.5+0204. II. New Optical Spectroscopic Observations in a Wider Area and Cluster Dynamical State | |
| 2021ApJ...918...63A | Fast-transient Searches in Real Time with ZTFReST: Identification of Three Optically Discovered Gamma-Ray Burst Afterglows and New Constraints on the Kilonova Rate | |
| 2021ApJ...918...82B | KMTNet Nearby Galaxy Survey. III. Deficient Hα Flux in the Extended Disks of Spiral Galaxies | |
| 2021ApJ...918...88M | Resolved Dwarf Galaxy Searches within 5 Mpc with the Vera Rubin Observatory and Subaru Hyper Suprime-Cam | |
| 2021ApJ...918...89A | The Nickel Mass Distribution of Stripped-envelope Supernovae: Implications for Additional Power Sources | |
| 2021ApJ...919...16F | Measurements of the Hubble Constant: Tensions in Perspective | |
| 2021ApJ...919...17S | Spitzer's Last Look at Extragalactic Explosions: Long-term Evolution of Interacting Supernovae | |
| 2021ApJ...919...40P | The Highly Self-absorbed Blazar PKS 1351-018 | |
| 2021ApJ...919...49Z | SN 2017fgc: A Fast-expanding Type Ia Supernova Exploded in Massive Shell Galaxy NGC 474 | |
| 2021ApJ...919...62R | Orientation and Accretion in a Representative Sample of Active Galactic Nuclei | |
| 2021ApJ...919...73K | Anomalous Hα Emission Line Profile Detected at the Center of DDO 53 | |
| 2021ApJ...919...77C | An ALMA Gas-dynamical Mass Measurement of the Supermassive Black Hole in the Local Compact Galaxy UGC 2698 | |
| 2021ApJ...919..108K | The Nature of Jets in Double-peaked Emission-line AGN in the KISSR Sample | |
| 2021ApJ...919..122V | A Spatially Resolved Survey of Distant Quasar Host Galaxies. I. Dynamics of Galactic Outflows | |
| 2021ApJ...919..137T | Broadband Modeling of Low-luminosity Active Galactic Nuclei Detected in Gamma Rays | |
| 2021ApJ...919..142B | A Bright Ultraviolet Excess in the Transitional 02es-like Type Ia Supernova 2019yvq | |
| 2021ApJ...919L..24B | A Local Universe Host for the Repeating Fast Radio Burst FRB 20181030A | |
| 2021ApJ...920....9L | Reverberation Mapping of Two Luminous Quasars: The Broad-line Region Structure and Black Hole Mass | |
| 2021ApJ...920...60J | Long-term Evolution of the Short-term X-Ray Variability of the Jetted TDE Swift J1644+57 | |
| 2021ApJ...920...63Z | NGC 147 Corroborates the Break in the Stellar Mass-Stellar Metallicity Relation for Galaxies | |
| 2021ApJ...920...84L | A Sub-2% Distance to M31 from Photometrically Homogeneous Near-infrared Cepheid Period-Luminosity Relations Measured with the Hubble Space Telescope | |
| 2021ApJ...920..104P | The Resolved Sunyaev-Zel'dovich Profiles of Nearby Galaxy Groups | |
| 2021ApJ...920..127J | AT 2019qyl in NGC 300: Internal Collisions in the Early Outflow from a Very Fast Nova in a Symbiotic Binary | |
| 2021ApJ...920..152N | Variable Stars in Local Group Galaxies. VI. The Isolated Dwarfs VV 124 and KKr 25 | |
| 2021ApJ...920L..21M | Asymmetric H I 21 cm Lines of Fast Radio Burst Hosts: Connection with Galaxy Interaction | |
| 2021ApJ...921....8P | Resolved Nuclear Kinematics Link the Formation and Growth of Nuclear Star Clusters with the Evolution of Their Early- and Late-type Hosts | |
| 2021ApJ...921...35C | The Quest for the Missing Dust. I. Restoring Large-scale Emission in Herschel Maps of Local Group Galaxies | |
| 2021ApJ...921...36B | A Local Baseline of the Black Hole Mass Scaling Relations for Active Galaxies. IV. Correlations Between MBH and Host Galaxy σ, Stellar Mass, and Luminosity | |
| 2021ApJ...921...42S | Gaia GraL: Gaia DR2 Gravitational Lens Systems. VI. Spectroscopic Confirmation and Modeling of Quadruply Imaged Lensed Quasars | |
| 2021ApJ...921..104C | Testing the Strong Equivalence Principle. II. Relating the External Field Effect in Galaxy Rotation Curves to the Large-scale Structure of the Universe | |
| 2021ApJ...921..129T | AGN-Host Interaction in IC 5063. I. Large-scale X-Ray Morphology and Spectral Analysis | |
| 2021ApJ...921L..35L | A High-velocity Scatterer Revealed in the Thinning Ejecta of a Type II Supernova | |
| 2021ApJ...922...84B | X-Ray Emission of the γ-ray-loud Young Radio Galaxy NGC 3894 | |
| 2021ApJ...922...88O | SÍGAME v3: Gas Fragmentation in Postprocessing of Cosmological Simulations for More Accurate Infrared Line Emission Modeling | |
| 2021ApJ...922..141O | Are Stripped Envelope Supernovae Really Deficient in 56Ni? | |
| 2021ApJ...922..151K | AGN STORM 2. I. First results: A Change in the Weather of Mrk 817 | |
| 2021ApJ...922..157M | Modeling the Unresolved NIR-MIR SEDs of Local (z < 0.1) QSOs | |
| 2021ApJ...922..159T | Compton-Thick AGN in the NuSTAR ERA VII. A joint NuSTAR, Chandra, and XMM-Newton Analysis of Two Nearby, Heavily Obscured Sources | |
| 2021ApJ...922..186H | Measuring an Off-center Detonation through Infrared Line Profiles: The Peculiar Type Ia Supernova SN 2020qxp/ASASSN-20jq | |
| 2021ApJ...922..237W | GRB 210121A: A Typical Fireball Burst Detected by Two Small Missions | |
| 2021ApJ...922..252T | Compton-thick AGN in the NuSTAR Era VI: The Observed Compton-thick Fraction in the Local Universe | |
| 2021ApJ...922..267C | Structures of Dwarf Satellites of Milky Way-like Galaxies: Morphology, Scaling Relations, and Intrinsic Shapes | |
| 2021ApJ...922..268J | RELICS: ICL Analysis of the z = 0.566 Merging Cluster WHL J013719.8-08284 | |
| 2021ApJ...922..272Y | Anomalous Hydrogen Recombination Line Ratios in Ultraluminous Infrared Galaxies | |
| 2021ApJ...923....7B | Characterizing Long-term Optical Variability Properties of γ-Ray-bright Blazars | |
| 2021ApJ...923....9M | Dwarf Galaxies in the MATLAS Survey: Hubble Space Telescope Observations of the Globular Cluster System in the Ultra-diffuse Galaxy MATLAS-2019 | |
| 2021ApJ...923...12A | Evolution of the Ultraviolet Upturn at 0.3 < z < 1: Exploring Helium-rich Stellar Populations | |
| 2021ApJ...923...26D | On the Impact of Inclination-dependent Attenuation on Derived Star Formation Histories: Results from Disk Galaxies in the Great Observatories Origins Deep Survey Fields | |
| 2021ApJ...923...30L | Monitoring Of Jets in Active Galactic Nuclei with VLBA Experiments. XVIII. Kinematics and Inner Jet Evolution of Bright Radio-loud Active Galaxies | |
| 2021ApJ...923...44S | Identifying Circumgalactic Medium Absorption in QSO Spectra: A Bayesian Approach | |
| 2021ApJ...923...51K | MOMO. IV. The Complete Swift X-Ray and UV/Optical Light Curve and Characteristic Variability of the Blazar OJ 287 during the Last Two Decades | |
| 2021ApJ...923...59V | Multiphase Outflows in High-redshift Quasar Host Galaxies | |
| 2021ApJ...923...60V | The EDGE-CALIFA Survey: The Resolved Star Formation Efficiency and Local Physical Conditions | |
| 2021ApJ...923...65F | Stellar Population and Elemental Abundance Gradients of Early-type Galaxies | |
| 2021ApJ...923...67H | MOJAVE. XIX. Brightness Temperatures and Intrinsic Properties of Blazar Jets | |
| 2021ApJ...923...86C | Local Environments of Low-redshift Supernovae | |
| 2021ApJ...923..111T | Exploratory X-Ray Monitoring of Luminous Radio-quiet Quasars at High Redshift: Extended Time-series Analyses and Stacked Imaging Spectroscopy | |
| 2021ApJ...923..146G | Potential Black Hole Seeding of the Spiral Galaxy NGC 4424 via an Infalling Star Cluster | |
| 2021ApJ...923..197P | Are Type Ia Supernovae in Rest-frame H Brighter in More Massive Galaxies? | |
| 2021ApJ...923..206S | Deeply Buried Nuclei in the Infrared-luminous Galaxies NGC 4418 and Arp 220. I. ALMA Observations at λ = 1.4-0.4 mm and Continuum Analysis | |
| 2021ApJ...923..232R | The Sample of Red Supergiants in 12 Low-mass Galaxies of the Local Group | |
| 2021ApJ...923..235C | Star-forming Dwarf Galaxies in Filamentary Structures around the Virgo Cluster: Probing Chemical Pre-processing in Filament Environments | |
| 2021ApJ...923..240S | Deeply Buried Nuclei in the Infrared-luminous Galaxies NGC 4418 and Arp 220. II. Line Forests at λ = 1.4-0.4 mm and Circumnuclear Gas Observed with ALMA | |
| 2021ApJ...923..246G | Central X-Ray Point Sources Found to Be Abundant in Low-mass, Late-type Galaxies Predicted to Contain an Intermediate-mass Black Hole | |
| 2021ApJ...923..251H | Second-epoch ALMA Observations of 321 GHz Water Maser Emission in NGC 4945 and the Circinus Galaxy | |
| 2021ApJ...923..257K | On the Properties of Spectroscopically Confirmed Ultra-diffuse Galaxies across Environments | |
| 2021ApJ...923..258K | The Gravity Collective: A Search for the Electromagnetic Counterpart to the Neutron Star-Black Hole Merger GW190814 | |
| 2021ApJ...923..278L | Massive Star Cluster Formation and Destruction in Luminous Infrared Galaxies in GOALS. II. An ACS/WFC3 Survey of Nearby LIRGs | |
| 2021ApJ...923L...8J | Discovery of the Fastest Early Optical Emission from Overluminous SN Ia 2020hvf: A Thermonuclear Explosion within a Dense Circumstellar Environment | |
| 2021ApJS..252...15M | Placing High-redshift Quasars in Perspective: A Catalog of Spectroscopic Properties from the Gemini Near Infrared Spectrograph-Distant Quasar Survey | |
| 2021ApJS..252...18T | Shadows in the Dark: Low-surface-brightness Galaxies Discovered in the Dark Energy Survey | |
| 2021ApJS..252...29K | BAT AGN Spectroscopic Survey. XX. Molecular Gas in Nearby Hard-X-Ray-selected AGN Galaxies | |
| 2021ApJS..252...32J | Mid-infrared Outbursts in Nearby Galaxies (MIRONG). I. Sample Selection and Characterization | |
| 2021ApJS..253....3H | The Atacama Cosmology Telescope: A Catalog of >4000 Sunyaev–Zel’dovich Galaxy Clusters | |
| 2021ApJS..253....4M | SuperBoRG: Search for the Brightest of Reionizing Galaxies and Quasars in HST Parallel Imaging Data | |
| 2021ApJS..253...20H | Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XII. Reverberation Mapping Results for 15 PG Quasars from a Long-duration High-cadence Campaign | |
| 2021ApJS..253...25K | Giant Radio Quasars: Sample and Basic Properties | |
| 2021ApJS..253...37R | X-Ray-to-radio Offset Inference from Low-count X-Ray Jets | |
| 2021ApJS..253...46P | The Central Engines of Fermi Blazars | |
| 2021ApJS..253...53W | The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). I. Ultraviolet to Infrared Photometry of 22 Million Stars in M33 | |
| 2021ApJS..254...15A | Introducing piXedfit: A Spectral Energy Distribution Fitting Code Designed for Resolved Sources | |
| 2021ApJS..254...30P | Catalog of One-side Head-Tail Galaxies in the FIRST Survey | |
| 2021ApJS..255...10M | A Search for Rapid Mid-infrared Variability in Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies | |
| 2021ApJS..255...18M | Hidden Treasures in the Unknown 3CR Extragalactic Radio Sky: A Multiwavelength Approach | |
| 2021ApJS..255...19L | PHANGS-ALMA Data Processing and Pipeline | |
| 2021ApJS..255...20A | The Dark Energy Survey Data Release 2 | |
| 2021ApJS..255...21J | Infrared Surface Brightness Fluctuation Distances for MASSIVE and Type Ia Supernova Host Galaxies | |
| 2021ApJS..255...22M | An Atlas of Dynamical Evolution Models of 361 Fanaroff-Riley Type II Radio Sources | |
| 2021ApJS..255...29S | The Palomar Transient Factory Core-collapse Supernova Host-galaxy Sample. I. Host-galaxy Distribution Functions and Environment Dependence of Core-collapse Supernovae | |
| 2021ApJS..256....5R | Astro-COLIBRI-The COincidence LIBrary for Real-time Inquiry for Multimessenger Astrophysics | |
| 2021ApJS..256...15B | Stellar Mass and Star Formation Rate within a Billion Light-years | |
| 2021ApJS..256...22I | An XMM-Newton Early-type Galaxy Atlas | |
| 2021ApJS..256...27P | Hubble Frontier Field Clusters and Their Parallel Fields: Photometric and Photometric Redshift Catalogs | |
| 2021ApJS..257...21B | VERTICO: The Virgo Environment Traced in CO Survey | |
| 2021ApJS..257...28M | An ACA Survey of [C I] 3P1-3P0, CO J = 4 - 3, and Dust Continuum in Nearby U/LIRGs | |
| 2021ApJS..257...35C | A MeerKAT 1.28 GHz Atlas of Southern Sources in the IRAS Revised Bright Galaxy Sample | |
| 2021ApJS..257...42L | One of Everything: The Breakthrough Listen Exotica Catalog | |
| 2021ApJS..257...43L | PHANGS-ALMA: Arcsecond CO(2-1) Imaging of Nearby Star-forming Galaxies | |
| 2021ApJS..257...57U | Cold Molecular Gas in Merger Remnants. II. The Properties of Dense Molecular Gas | |
| 2021ApJS..257...60Z | Systematically Measuring Ultra-diffuse Galaxies (SMUDGes). II. Expanded Survey Description and the Stripe 82 Catalog | |
| 2021ApJS..257...61Y | Comprehensive Broadband X-Ray and Multiwavelength Study of Active Galactic Nuclei in 57 Local Luminous and Ultraluminous Infrared Galaxies Observed with NuSTAR and/or Swift/BAT | |
| 2021ApJS..257...64K | Hard X-Ray Irradiation Potentially Drives Negative AGN Feedback by Altering Molecular Gas Properties | |
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