Astronomy:NGC 3977
| NGC 3977 | |
|---|---|
 NGC 3977 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 11h 56m 07.1952s[1] |
| Declination | +55° 23′ 26.718″[1] |
| Redshift | 0.019370[1] |
| Helio radial velocity | 5,807±5 km/s[1] |
| Distance | 287.4 ± 20.1 Mly (88.13 ± 6.17 Mpc)[1] |
| Group or cluster | Holm 304 |
| Apparent magnitude (V) | 13.4[1] |
| Characteristics | |
| Type | (R)SA(rs)ab?[1] |
| Size | ~156,600 ly (48.00 kpc) (estimated)[1] |
| Apparent size (V) | 1.5′ × 1.4′[1] |
| Other designations | |
| HOLM 304B, NGC 3980, UGC 6909, MCG+09-20-034, PGC 37497[1] | |
NGC 3977 is an unbarred spiral galaxy in the constellation of Ursa Major. Its velocity with respect to the cosmic microwave background is 5,975±13 km/s, which corresponds to a Hubble distance of 287.4 ± 20.1 Mly (88.13 ± 6.17 Mpc).[1] It was discovered by German-British astronomer William Herschel on 13 April 1784.[2] It was also observed by Lewis Swift on 16 April 1885, causing this galaxy to be listed twice in the New General Catalogue, as both NGC 3977 and NGC 3980.[2]
NGC 3977 along with NGC 3972 are listed together as Holm 304 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.[3] This grouping is purely optical, as NGC 3977 is about four times farther away than NGC 3972.[4]
The SIMBAD database lists NGC 3977 as a LINER galaxy, i.e. a galaxy whose nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms.[5]
Supernovae
Two supernovae have been observed in NGC 3977:
- SN 1946A (type unknown, mag. 18) was discovered by Edwin Hubble in May 1946.[6]
- SN 2006gs (Type II, mag. 17.0) was discovered by Kōichi Itagaki on 22 September 2006.[7][8]
See also
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 3977". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+3977.
- ↑ 2.0 2.1 Seligman, Courtney. "New General Catalogue Objects: NGC 3977". https://cseligman.com/text/atlas/ngc39a.htm#3977.
- ↑ Holmberg, Erik (1937). "A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems". Annals of the Observatory of Lund 6: 1. Bibcode: 1937AnLun...6....1H.
- ↑ "Distance Results for NGC 3972". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+3972.
- ↑ "NGC 3977". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+3977.
- ↑ "SN 1946A". IAU. https://www.wis-tns.org/object/1946A.
- ↑ Frieman, J.; Prasad, R. R.; Li, W.; Itagaki, K.; Nakano, S.; Quimby, R.; Mondol, P.; Puckett, T. et al. (2006). "Supernovae 2006gk-2006gz". International Astronomical Union Circular (8754): 1. Bibcode: 2006IAUC.8754....1F. http://www.cbat.eps.harvard.edu/iauc/08700/08754.html#Item1.
- ↑ "SN 2006gs". IAU. https://www.wis-tns.org/object/2006gs.
External links
- NGC 3977 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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