| Refcode | Title | |
| 1998ApJ...492...57D | An X-Ray Temperature Map of the Merging Cluster Abell 2255 | |
| 1998ApJ...492...79F | X-Ray Spectral Survey of WGACAT Quasars. I. Spectral Evolution and Low-Energy Cutoffs | |
| 1998ApJ...492...91E | X-Ray Spectral Survey of WGACAT Quasars. II. Optical and Radio Properties of Quasars with Low-Energy X-Ray Cutoffs | |
| 1998ApJ...492..110M | HIPPARCOS Parallaxes and the Cepheid Distance Scale | |
| 1998ApJ...492..116S | HST/WFPC2 Observations of Warm Ultraluminous Infrared Galaxies | |
| 1998ApJ...492..137S | The Starburst-AGN Connection. II. The Nature of Luminous Infrared Galaxies as Revealed by VLBI, VLA, Infrared, and Optical Observations | |
| 1998ApJ...492..173K | Monitoring Lyα Emission from the Blazar 3C 279 | |
| 1998ApJ...492..521P | Physical Conditions of the Molecular Gas in Seyfert Galaxies | |
| 1998ApJ...492L.135S | WFPC2 Observations of NGC 454: An Interacting Pair of Galaxies | |
| 1998ApJ...493...62R | Anatomy of a Merger: A Numerical Model of A754 | |
| 1998ApJ...493...91T | ASCA Observations of Type 2 Seyfert Galaxies. III. Orientation and X-Ray Absorption | |
| 1998ApJ...493..129S | The Asymmetric Wind in M82 | |
| 1998ApJ...494...47F | Limits on Cosmological Models from Radio-selected Gravitational Lenses | |
| 1998ApJ...494..150S | Starburst Galaxies. III. Properties of a Radio-selected Sample | |
| 1998ApJ...494..175C | Redshifted Neutral Hydrogen 21 Centimeter Absorption toward Red Quasars | |
| 1998ApJ...494..503B | Constraining Ω0 with the Angular Size-Redshift Relation of Double-lobed Quasars in the FIRST Survey | |
| 1998ApJ...494L.155F | Molecular Hydrogen and Paα Emission in Cooling Flow Galaxies | |
| 1998ApJ...495..152L | The Formation of Quasars in Low-Luminosity Hosts via Galaxy Harassment | |
| 1998ApJ...495..196A | A Near-Infrared Imaging Study of Seyfert Galaxies with Extended Emission-Line Regions | |
| 1998ApJ...495..222R | Balmer Line Variations in the Radio-loud Active Galactic Nucleus PG 1512+370 | |
| 1998ApJ...495..227L | An Unusual Radio Galaxy in Abell 428: A Large, Powerful FR I Source in a Disk-dominated Host | |
| 1998ApJ...495..276A | The [O iii] Emission-Line Nebula of the Z = 3.594 Radio Galaxy 4C +19.71 | |
| 1998ApJ...495..749S | ASCA Observations of the Broad-Line Radio Galaxy 3C 445 | |
| 1998ApJ...495L..47H | The Nature of the Extended H I Gas around NGC 4449: The Dr. Jekyll/Mr. Hyde of Irregular Galaxies | |
| 1998ApJ...495L..75B | X-Ray Emission from Early-Type Galaxies: A Complete Sample Observed by ROSAT | |
| 1998ApJ...496...39Z | The Properties of Poor Groups of Galaxies. I. Spectroscopic Survey and Results | |
| 1998ApJ...496...73M | The Properties of Poor Groups of Galaxies. II. X-Ray and Optical Comparisons | |
| 1998ApJ...496..117F | The Near- and Mid-Infrared Continuum Emission of Seyfert Nuclei: Constraints on the Models of Obscuring Tori | |
| 1998ApJ...496..133B | A Search for Ultraviolet Emission from LINERs | |
| 1998ApJ...496..145L | Dust-to-Gas Ratio and Metal Abundance in Dwarf Galaxies | |
| 1998ApJ...496..177M | Hubble Space Telescope Observations of the Gravitationally Lensed Cloverleaf Broad Absorption Line QSO H1413+1143: Spectroscopy of the Lyα Forest and Metal-Line Systems | |
| 1998ApJ...496..786C | Large-Scale Outflows in Edge-on Seyfert Galaxies. III. Kiloparsec-Scale Soft X-Ray Emission | |
| 1998ApJ...496L...5T | 1E 0657-56: A Contender for the Hottest Known Cluster of Galaxies | |
| 1998ApJ...497...89V | Effects of Interaction-induced Activities in Hickson Compact Groups: CO and Far-Infrared Study | |
| 1998ApJ...497..133B | Radio-luminous Southern Seyfert Galaxies. I. Radio Images and Selected Optical/Near-Infrared Spectroscopy | |
| 1998ApJ...497..594T | VLBI Observations of Gamma-Ray-quiet Active Galactic Nuclei: Comparing Radio-Core Brightness Temperatures | |
| 1998ApJ...498..170G | Differences between the Optical/Ultraviolet Spectra of X-Ray Bright and X-Ray Faint QSOs | |
| 1998ApJ...498..181K | The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XIII. The Metallicity Dependence of the Cepheid Distance Scale | |
| 1998ApJ...498..195F | A Spectroscopic Survey of the Galaxy Cluster CL 1358+62 at Z = 0.328 | |
| 1998ApJ...498..553E | Near-Infrared Spectroscopy of Powerful Radio Galaxies at Z = 2.2-2.6 | |
| 1998ApJ...498..570D | Probing the Dusty Accretion Torus of Seyfert Galaxies | |
| 1998ApJ...498..660P | High-Energy Gamma-Ray Emission from Galactic Kerr-Newman Black Holes. II. The Radiative Jets | |
| 1998ApJ...498L.115B | Mid-Infrared [Ne II] Line Emission from the Nucleus of NGC 253 | |
| 1998ApJ...499..670B | Far-Infrared Emission From E and E/S0 Galaxies | |
| 1998ApJ...499..713T | Evidence of Energy Nonequipartition between Particles and Fields in Lobes of the Radio Galaxy PKS 1343-601 (Centaurus B) | |
| 1998ApJ...500..173A | Optical Identification of the Hardest X-Ray Source in the ASCA Large-Sky Survey | |
| 1998ApJ...500..181S | ISOCAM Mid-Infrared Imaging of the Quiescent Spiral Galaxy NGC 7331 | |
| 1998ApJ...500..642H | Central Black Hole Masses in Active Galactic Nuclei Inferred from X-Ray Variability | |
| 1998ApJ...500..660T | Scattered Radiation from Obscured Quasars in Distant Radio Galaxies | |
| 1998ApJ...500..693F | The Mid-Infrared Color-Luminosity Relation and the Local 12 Micron Luminosity Function | |
| 1998ApJ...501...32H | The Hubble Space Telescope Extragalactic Distance Scale Key Project. X. The Cepheid Distance to NGC 7331 | |
| 1998ApJ...501...82P | Optical Continuum and Emission-Line Variability of Seyfert 1 Galaxies | |
| 1998ApJ...501...94S | The Nature of the Optical Light in Seyfert 2 Galaxies with Polarized Continua | |
| 1998ApJ...501..110B | Spectropolarimetry of 3CR 68.1: A Highly Inclined Quasar | |
| 1998ApJ...501..597S | The Local Luminosity Function at 25 Microns | |
| 1998ApJ...501L.171S | Near-Infrared Observations of a Redshift 4.92 Galaxy: Evidence for Significant Dust Absorption | |
| 1998ApJ...502..130R | Sheets and Filaments as the Origin of the High-Velocity Tail of the Lyα Forest | |
| 1998ApJ...502..134W | Statistics of Active Galactic Nuclei in Rich Clusters Revisited | |
| 1998ApJ...502..199F | Hubble Space Telescope and VLA Observations of Seyfert 2 Galaxies: The Relationship between Radio Ejecta and the Narrow-Line Region | |
| 1998ApJ...502..218A | Radio Spectra of Selected Compact Sources in the Nucleus of M82 | |
| 1998ApJ...502..229S | A Radio Millihalo in the Nucleus of NGC 1275 | |
| 1998ApJ...502..558V | A Catalog of 200 Galaxy Clusters Serendipitously Detected in the ROSAT PSPC Pointed Observations | |
| 1998ApJ...502..582C | Extensive Spiral Structure and Corotation Resonance | |
| 1998ApJ...502L..23P | Kinematics of the Neutral Hydrogen Toward the Core of NGC 3894 | |
| 1998ApJ...503..138D | Near-Infrared Imaging of Gigahertz Peaked Spectrum, Compact Steep Spectrum, and Large-Scale FR II Radio Galaxies | |
| 1998ApJ...503..156D | Hosts of Powerful Radio Galaxies in the Near-Infrared: Implications for Radio Source Evolution | |
| 1998ApJ...503..231F | Molecular Gas in Markarian 109: Constraining the O2/CO Ratio in Chemically Young Galaxies | |
| 1998ApJ...503..646H | The Ultraviolet Spectroscopic Properties of Local Starbursts: Implications at High Redshift | |
| 1998ApJ...503L..19Y | Deep H-Band Galaxy Counts and Half-Light Radii from Hubble Space Telescope/NICMOS Parallel Observations | |
| 1998ApJ...503L.109H | On the Far-Infrared Emission of Quasars | |
| 1998ApJ...504...64L | First Results from the ISO-IRAS Faint Galaxy Survey | |
| 1998ApJ...504...93V | Near-Infrared Spectroscopy of ARP Interacting Galaxies | |
| 1998ApJ...504..693K | ASCA Observations of Blazars and Multiband Analysis | |
| 1998ApJ...504..702L | Submilliarcsecond Polarimetric Imaging of Blazar Jets at 43 GHz | |
| 1998ApJ...504..720B | Star Formation in Dwarf Galaxies | |
| 1998ApJ...505..111J | Measuring Distances Using Infrared Surface Brightness Fluctuations | |
| 1998ApJ...505..174G | Ultraviolet-Optical Observations of the Seyfert 2 Galaxies NGC 7130, NGC 5135, and IC 3639: Implications for the Starburst-Active Galactic Nucleus Connection | |
| 1998ApJ...505..207T | The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XI. The Cepheids in NGC 4414 | |
| 1998ApJ...505..506G | Lyα Absorption Systems and the Nearby Galaxy Distribution | |
| 1998ApJ...505..536H | The Luminosity Function of Galaxies in Compact Groups | |
| 1998ApJ...505..594N | New Constraints on the Continuum Emission Mechanism of Active Galactic Nuclei: Intensive Monitoring of NGC 7469 in the X-Ray and Ultraviolet | |
| 1998ApJ...505..639E | The Nuclear Starburst in NGC 253 | |
| 1998ApJ...505..732H | ASCA X-Ray Spectroscopy of Large Magellanic Cloud Supernova Remnants and the Metal Abundances of the Large Magellanic Cloud | |
| 1998ApJ...506..116R | Near-Infrared Halo Emission in the Edge-on Spiral Galaxy ESO 240-G11 | |
| 1998ApJ...506..205E | Near-Infrared Spectroscopy and a Search for CO Emission in Three Extremely Luminous IRAS Sources: IRAS F09105+4108, IRAS F15307+3252, and PG 1634+706 | |
| 1998ApJ...506..509K | Correlation Function of Superclusters of Galaxies | |
| 1998ApJ...506..519T | An Infrared Search for Star-forming Galaxies at Z > 2 | |
| 1998ApJ...506..637T | Magnetic Fields in Quasar Cores | |
| 1998ApJ...506..647S | The Difference between the Narrow-Line Regions of Seyfert 1 and Seyfert 2 Galaxies | |
| 1998ApJ...506L..89A | Near-Infrared Observations of a Redshift 5.34 Galaxy: Further Evidence for Dust Absorption in the Early Universe | |
| 1998ApJ...506L.101V | Enhanced Hα Emission in Early-Type Galaxies Belonging to Compact Groups | |
| 1998ApJ...507..155C | Star Formation Rates in Faint Radio Galaxies | |
| 1998ApJ...507..558H | An Optical/Near-Infrared Study of Radio-loud Quasar Environments. II. Imaging Results | |
| 1998ApJ...507..706P | Geodetic VLBI Observations of EGRET Blazars | |
| 1998ApJ...507..726S | The Missing Interstellar Medium of NGC 147 and M32 | |
| 1998ApJ...507..759A | The Stellar Dynamics and Mass of NGC 1316 Using the Radial Velocities of Planetary Nebulae | |
| 1998ApJ...507..774Y | CO (J = 4 --> 3) and 650 Micron Continuum Observations of the z = 0.93 Hyperluminous Infrared Galaxy FSC 15307+3252 | |
| 1998ApJ...507L.121T | 13CO (J = 1-0) Depression in Luminous Starburst Mergers | |
| 1998ApJ...508..576X | Emission Features and Source Counts of Galaxies in the Mid-Infrared | |
| 1998ApJ...508..627K | The IRAS 1 Jy Sample of Ultraluminous Infrared Galaxies. II. Optical Spectroscopy | |
| 1998ApJ...508..648T | X-Ray Signatures of an Ionized Reprocessor in the Seyfert Galaxy Ton S180 | |
| 1998ApJ...508L..33S | Discovery of a Nuclear X-Ray Source in NGC 7331: Evidence for a Massive Black Hole | |
| 1998ApJ...509..309C | A Search for Peculiar Objects with the NASA Orbital Debris Observatory 3 Meter Liquid Mirror Telescope | |
| 1998ApJS..114...59L | A Near-Infrared Spectroscopic Survey of LINER Galaxies | |
| 1998ApJS..114...73G | ASCA Observations of Seyfert 1 Galaxies. III. The Evidence for Absorption and Emission Due to Photoionized Gas | |
| 1998ApJS..114..177Z | The Ultraviolet Continuum Emission of Radio Galaxies. I. Description of Sources from the Hubble Space Telescope Archives | |
| 1998ApJS..115....1S | The MX Northern Abell Cluster Redshift Survey | |
| 1998ApJS..115...43N | Very Wide Galaxy Pairs of the Northern and Southern Sky | |
| 1998ApJS..115..163D | A CCD Study of the Environment of Seyfert Galaxies. I. The Survey | |
| 1998ApJS..116...29G | Infrared Observations of Galaxies in the Local Universe. I. The Survey and Some Representative Results | |
| 1998ApJS..117...25M | A Hubble Space Telescope Imaging Survey of Nearby Active Galactic Nuclei | |
| 1998ApJS..117..319A | Identification of a Complete Sample of Northern ROSAT All-Sky Survey X-Ray Sources. III. The Catalog | |
| 1998ApJS..117..361C | Planetary Nebulae in the NRAO VLA Sky Survey | |
| 1998ApJS..118..127L | Radio-loud Active Galaxies in the Northern ROSAT All-Sky Survey. III. New Spectroscopic Identifications from the RASS-Green Bank BL Lacertae Survey | |
| 1998ApJS..118..401D | An X-Ray Minisurvey of Nearby Edge-on Starburst Galaxies. I. The Data | |
| 1998ApJS..119....1H | An Optical Near-Infrared Study of Radio-loud Quasar Environments. I. Methods and Z = 1-2 Observations | |
| 1998ApJS..119...25H | A VLA Study of 15 3CR Radio Galaxies | |
| 1998ApJS..119...41K | The IRAS 1 Jy Survey of Ultraluminous Infrared Galaxies. I. The Sample and Luminosity Function | |
| 1998ApJS..119...75K | Pulsars in the NRAO VLA Sky Survey | |
| 1998ApJS..119..159S | A Deep Survey of H I-selected Galaxies: The Sample and the Data | |
| 1998ApJS..119..239C | The Pico DOS Dias Survey Starburst Galaxies | |
| 1998ApJS..119..277G | A Complete Redshift Survey to the Zwicky Catalog Limit in a 2h × 15° Region around 3C 273 | |
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