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Help Detailed Information for a Named Object

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Cosmological Parameters

Results for object NGC 3921 (Arp 224)

  • Overview
  • Cross-IDs (36)
  • Coordinates (15)
  • Redshifts (13)
  • Classifications (11)
  • Galaxy Extinctions
  • Notes (8)
  • Diameters (12)
  • Photometry & SED (82)
  • Spectra (5)
  • Images (40)
  • References (177)
  • External Links
SED Plot Loading...
IRSA FinderChart ImagePOSS-II F (North), AAO-SES/SERC-ER (South), Red image
Search images
Image Credit: Caltech or AAO/ROE

Selected data and derived quantities for NGC 3921†.  More information in the tabs above.
Cross-identificationsEssential note
NGC 3921; UGC 06823; ARP 224; VV 031; MRK 0430 VV misprints dec as +56d21.5; corrected in MCG errata.
Coordinates for Preferred Position
Equatorial (J2000)Galactic
RA, DecRA, Dec [Deg]Unc Semi-major,minor ["]Unc PA [deg]ReferenceLon, Lat [deg]
11h51m06.873s, +55d04m43.50s177.778640, 55.0787495.00E-01, 5.00E-01 02007SDSS6.C...0000:140.248833, 59.975008
Preferred Redshift & Derived Quantities [H0 = km/sec/Mpc], Ωmatter = , Ωvacuum = ]Redshift-independent Distances
z (Helio)V (Helio) [km/s]ReferenceV (CMB) [km/s]Hubble Distance (CMB) [Mpc]# Measurements
0.01967 +/- 0.000005896.019098 +/- 0.8993782006AJ....131..185R 6067 +/- 12 83.11 +/- 5.82
Classifications
Object TypeMorphologyReferenceActivity TypeReferenceOther
G(R')SA(s)0/a pec1991RC3.9.C...0000dStar-burst nucleus1983ApJ...268..602B(R')SA(s)0/a pec
Quick-look Angular & Physical DiametersForeground Galactic Extinction (2011ApJ...737..103S)
PassbandDiameter ["]ReferenceDiameter [kpc]Aλ [mag] VAλ [mag] K
POSS1 103a-O 132.001973UGC...C...0000N55.24 0.0380.004
Quick-look Photometry & Luminosities (brightest flux in each spectral region)
Spectral regionBandApparent mag or fluxReferenceAbsolute Mag or νLν [W]νLν [L☉(bol)]
X-Ray
UV
Visible z (SDSS Model) AB 12.266 +/- 0.002 asinh mag 2007SDSS6.C...0000: -22.37 +/- 0.50 [mag] 3.19E+10 +/- 6.37E+09
Near-IR H 10.063 +/- 0.020 mag 20032MASX.C.......: -24.57 +/- 0.50 [mag] 3.90E+10 +/- 7.84E+09
Far-IR 60 microns (IRAS) 8.279E-01 +/- 6 % Jy 1990IRASF.C...0000M 3.53E+36 +/- 7.38E+35 [W] 9.19E+09 +/- 1.92E+09
Radio 1.4GHz 8.4 +/- 0.5 milliJy 1998AJ....115.1693C 1.00E+31 +/- 2.09E+30 [W] 2.61E+04 +/- 5.44E+03
 †Derived quantities are based on the median redshift-independent distance when available, otherwise the preferred redshift is used with the selected cosmological parameters (which can be changed in search options).
 Cosmological params can be changed in search options.
Cross-identifications for NGC 3921
Coordinates for NGC 3921
Preferred Position:  11h51m06.873s +55d04m43.50s Equatorial J2000.0  (2007SDSS6.C...0000:)
Preferred Position of NGC 3921
Reference FrameLongitudeLatitudeLongitudeLatitudeUncertainty Ellipse (arcsec)
Decimal DegreesDecimal DegreesSexagesimalSexagesimalSemimajor (a)Semiminor (b)PA (deg)
RA/Dec Equatorial (J2000.0)177.77864055.07874911h51m06.873s+55d04m43.50s5.00E-015.00E-01 0
RA/Dec Equatorial (B1950.0)177.12018955.35679411h48m28.845s+55d21m24.46s5.00E-015.00E-01 0
Galactic140.24883359.9750085.00E-015.00E-01 0
Supergalactic59.9346924.0329955.00E-015.00E-01 0
Ecliptic (J2000.0)148.79390848.0264695.00E-015.00E-01 0
Ecliptic (B1950.0)148.08900248.0234885.00E-015.00E-01 0
Measured Positions for NGC 3921
Redshifts and Derived Quantities for NGC 3921
Preferred Redshift: Z = 0.01967, H0 = km/sec/Mpc, Ωmatter = , Ωvacuum =
Quantities Derived from Preferred Redshift for NGC 3921 
Calculated and Corrected Velocities
TypeVelocitiesReference
V (Heliocentric) 5896 ± 1 km/s2006AJ....131..185R
V (Kinematic LSR) 5904 ± 1 km/s1986MNRAS.221.1023K
V (Galactocentric GSR) 5973 ± 3 km/s1991RC3.9.C...0000d
V (Local Group) 5984 ± 5 km/s1996AJ....111..794K
V (3K CMB) 6067 ± 12 km/s1996ApJ...473..576F
V (Virgo Infall only) 6165 ± 14 km/s2000ApJ...529..786M
V (Virgo + GA only) 6269 ± 16 km/s2000ApJ...529..786M
V (Virgo + GA + Shapley) 6302 ± 16 km/s2000ApJ...529..786M
Hubble Flow Distance and Distance Modulus (where H0 = km/sec/Mpc ± km/sec/Mpc)
TypeDistanceModulus
D (Galactocentric GSR) 81.82 ± 5.73 Mpc(m-M) = 34.56 ± 0.15 mag
D (Local Group) 81.97 ± 5.74 Mpc(m-M) = 34.57 ± 0.15 mag
D (3K CMB) 83.11 ± 5.82 Mpc(m-M) = 34.60 ± 0.15 mag
D (Virgo Infall only) 84.45 ± 5.91 Mpc(m-M) = 34.63 ± 0.15 mag
D (Virgo + GA only) 85.87 ± 6.01 Mpc(m-M) = 34.67 ± 0.15 mag
D (Virgo + GA + Shapley) 86.32 ± 6.04 Mpc(m-M) = 34.68 ± 0.15 mag
Scale at Hubble Flow Distances
TypeValues
Scale (Galactocentric GSR) 397 pc/arcsec = 0.397 kpc/arcsec = 23.80 kpc/arcmin = 1.43 Mpc/degree
Scale (Local Group) 397 pc/arcsec = 0.397 kpc/arcsec = 23.84 kpc/arcmin = 1.43 Mpc/degree
Scale (3K CMB) 403 pc/arcsec = 0.403 kpc/arcsec = 24.17 kpc/arcmin = 1.45 Mpc/degree
Scale (Virgo Infall only) 409 pc/arcsec = 0.409 kpc/arcsec = 24.57 kpc/arcmin = 1.47 Mpc/degree
Scale (Virgo + GA only) 416 pc/arcsec = 0.416 kpc/arcsec = 24.98 kpc/arcmin = 1.50 Mpc/degree
Scale (Virgo + GA + Shapley) 419 pc/arcsec = 0.419 kpc/arcsec = 25.11 kpc/arcmin = 1.51 Mpc/degree
Cosmology-Corrected Quantities [H0 = km/sec/Mpc, Ωmatter = , Ωvacuum = ]
[Redshift 0.020237 as corrected to the ]
TypeValues
Luminosity Distance84.4 Mpc (m-M) = 34.63 mag
Angular-Size Distance81.1 (m-M) = 34.55 mag
Co-Moving Radial Distance82.8 (m-M) = 34.59 mag
Co-Moving Tangential Distance82.8 (m-M) = 34.59 mag
Co-Moving Volume0.00237 Gpc^3
Light Travel-Time 0.267 Gyr
Age at Redshift 0.020237 13.032 Gyr
Age of Universe 13.299 Gyr
Scale (Cosmology Corrected) 393 pc/arcsec = 0.393 kpc/arcsec = 23.60 kpc/arcmin = 1.42 Mpc/degree
Surface Brightness DimmingFlux Density per Unit Area = 0.92299; Magnitude per Unit Area = 0.08701 mag
Measured Redshifts of NGC 3921
Classifications for NGC 3921
Galaxy Extinctions for NGC 3921
Notes for NGC 3921
Measured Diameters for NGC 3921
Photometry & SED for NGC 3921
Quick-look Photometry & SED plot for NGC 3921
Quick Look Photometry & Luminosities (brightest flux in each spectral region)
SED Plot
Photometry for NGC 3921
See also Spectra.

Images for object NGC 3921 (Arp 224)

IRSA FinderChart ImagePOSS-II F (North), AAO-SES/SERC-ER (South), Red image
View in IRSA Finderchart

Image Credit: Caltech or AAO/ROE

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Literature References for NGC 3921
External Resource Links for NGC 3921
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