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Cosmological Parameters

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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

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POSS-II F (North), AAO-SES/SERC-ER (South), Red image
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Image Credit: Caltech or AAO/ROE

Selected data and derived quantities for NGC 3921†. More information in the tabs above.
Cross-identifications				Essential 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, Dec	RA, Dec [Deg]	Unc Semi-major,minor ["]	Unc PA [deg]	Reference	Lon, Lat [deg]
11h51m06.873s, +55d04m43.50s	177.778640, 55.078749	5.00E-01, 5.00E-01	0	2007SDSS6.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]	Reference	V (CMB) [km/s]	Hubble Distance (CMB) [Mpc]	# Measurements
0.01967 +/- 0.00000	5896.019098 +/- 0.899378	2006AJ....131..185R	6067 +/- 12	83.11 +/- 5.82
Classifications
Object Type	Morphology	Reference	Activity Type	Reference	Other
G	(R')SA(s)0/a pec	1991RC3.9.C...0000d	Star-burst nucleus	1983ApJ...268..602B	(R')SA(s)0/a pec
Quick-look Angular & Physical Diameters				Foreground Galactic Extinction (2011ApJ...737..103S)
Passband	Diameter ["]	Reference	Diameter [kpc]	A_λ [mag] V	A_λ [mag] K
POSS1 103a-O	132.00	1973UGC...C...0000N	55.24	0.038	0.004
Quick-look Photometry & Luminosities (brightest flux in each spectral region)
Spectral region	Band	Apparent mag or flux	Reference	Absolute Mag or νL_ν [W]	νL_ν [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 ()

Preferred Position of NGC 3921

Reference Frame	Longitude	Latitude	Longitude	Latitude	Uncertainty Ellipse (arcsec)
	Decimal Degrees	Decimal Degrees	Sexagesimal	Sexagesimal	Semimajor (a)	Semiminor (b)	PA (deg)
RA/Dec Equatorial (J2000.0)	177.778640	55.078749	11h51m06.873s	+55d04m43.50s	5.00E-01	5.00E-01	0
RA/Dec Equatorial (B1950.0)	177.120189	55.356794	11h48m28.845s	+55d21m24.46s	5.00E-01	5.00E-01	0
Galactic	140.248833	59.975008			5.00E-01	5.00E-01	0
Supergalactic	59.934692	4.032995			5.00E-01	5.00E-01	0
Ecliptic (J2000.0)	148.793908	48.026469			5.00E-01	5.00E-01	0
Ecliptic (B1950.0)	148.089002	48.023488			5.00E-01	5.00E-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
Type	Velocities	Reference
V (Heliocentric)	5896 ± 1 km/s	2006AJ....131..185R
V (Kinematic LSR)	5904 ± 1 km/s	1986MNRAS.221.1023K
V (Galactocentric GSR)	5973 ± 3 km/s	1991RC3.9.C...0000d
V (Local Group)	5984 ± 5 km/s	1996AJ....111..794K
V (3K CMB)	6067 ± 12 km/s	1996ApJ...473..576F
V (Virgo Infall only)	6165 ± 14 km/s	2000ApJ...529..786M
V (Virgo + GA only)	6269 ± 16 km/s	2000ApJ...529..786M
V (Virgo + GA + Shapley)	6302 ± 16 km/s	2000ApJ...529..786M
Hubble Flow Distance and Distance Modulus (where H₀ = km/sec/Mpc ± km/sec/Mpc)
Type	Distance	Modulus
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
Type	Values
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, Ω_matter = , Ω_vacuum = ]
[Redshift 0.020237 as corrected to the ]
Type	Values
Luminosity Distance	84.4 Mpc (m-M) = 34.63 mag
Angular-Size Distance	81.1 (m-M) = 34.55 mag
Co-Moving Radial Distance	82.8 (m-M) = 34.59 mag
Co-Moving Tangential Distance	82.8 (m-M) = 34.59 mag
Co-Moving Volume	0.00237 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 Dimming	Flux 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

Images for object NGC 3921 (Arp 224)

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

Image Credit: Caltech or AAO/ROE

Preview	File Size KB	Information	Lambda m	Clambda	Spectral Region	Band	FOV 1 arcmin	FOV 2 arcmin	Res. arcsec	Telescope	Refcode
Preview	File Size KB	Information	Lambda m	Clambda	Spectral Region	Band	FOV 1 arcmin	FOV 2 arcmin	Res. arcsec	Telescope	Refcode

Literature References for NGC 3921

External Resource Links for NGC 3921

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Results for object NGC 3921 (Arp 224)

Images for object NGC 3921 (Arp 224)