Astronomy:UGC 11861
| UGC 11861 | |
|---|---|
| File:250px The barred spiral galaxy UGC 11861, imaged by the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Cepheus |
| Right ascension | 21h 56m 24.3586s[1] |
| Declination | +73° 15′ 37.733″[1] |
| Redshift | 0.004930[1] |
| Helio radial velocity | 1478 ± 1 km/s[1] |
| Distance | 64.2 ± 4.5 Mly (19.68 ± 1.39 Mpc)[1] |
| Apparent magnitude (V) | 15.2[1] |
| Characteristics | |
| Type | SABdm[1] |
| Size | ~94,300 ly (28.91 kpc) (estimated)[1] |
| Apparent size (V) | 3.5′ × 2.6′[1] |
| Other designations | |
| IRAS 21557+7301, PGC 67671[1] | |
UGC 11861 is a barred spiral galaxy in the constellation of Cepheus. Its velocity with respect to the cosmic microwave background is 1334 ± 10 km/s, which corresponds to a Hubble distance of 19.68 ± 1.39 Mpc (~64.2 million light-years).[1] In addition, three non redshift measurements give a distance of 18.933 ± 5.26 Mpc (~61.7 million light-years).[2] The first known reference to this galaxy comes from volume IV of the Catalogue of Galaxies and of Clusters of Galaxies compiled by Fritz Zwicky in 1968, where it was listed as CGCG 343-003, and described as an "extremely diffuse spiral".[3]
The SIMBAD database lists UGC 11861 as an active galaxy nucleus candidate, i.e. it has a compact region at the center that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.[4] In addition, the galaxy contains two broad spiral arms wrapping around its central region.[5]
Supernovae
Three supernovae have been observed in UGC 11861:
- SN 1995ag (Type II, mag. 17) was discovered by Jean Mueller on 28 September 1995.[6][7]
- SN 1997db (Type II, mag. 16.9) was discovered by Michael Schwartz on 2 August 1997.[8][9]
- SN 2011dm (Type Ia, mag. 18.8) was discovered by the Lick Observatory Supernova Search (LOSS) on 15 June 2011.[10][11]
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 UGC 11861". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=UGC+11861.
- ↑ "Distance Results for UGC 11861". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=UGC+11861.
- ↑ Zwicky, Fritz; Herzog, E. (1968). Catalogue of galaxies and of clusters of galaxies. IV. California Institute of Technology. pp. 214–215. Bibcode: 1968cgcg.book.....Z. https://ui.adsabs.harvard.edu/abs/1968cgcg.book.....Z/abstract. Retrieved August 20, 2024.
- ↑ "UGC 11861". Strasbourg Astronomy Data Centre. https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=UGC+11861.
- ↑ information@eso.org. "A super(nova) spiral" (in en). https://esahubble.org/images/potw2434a/.
- ↑ Mueller, J.; Griffith, D.; Brewer, C.; Mendenhall, J. D.; Reid, I. N.; Gizis, J. (1995). "Supernova 1995ag in UGC 11861". International Astronomical Union Circular (6244): 1. Bibcode: 1995IAUC.6244....1M. http://www.cbat.eps.harvard.edu/iauc/06200/06244.html#Item1.
- ↑ "SN 1995ag". IAU. https://www.wis-tns.org/object/1995ag.
- ↑ Schwartz, M.; Offutt, W.; Filippenko, A. V.; Leonard, D. C.; Gilbert, A. M. (1997). "Supernova 1997db in UGC 11861". International Astronomical Union Circular (6711): 2. Bibcode: 1997IAUC.6711....2O. http://www.cbat.eps.harvard.edu/iauc/06700/06711.html#Item2.
- ↑ "SN 1997db". IAU. https://www.wis-tns.org/object/1997db.
- ↑ Kandrashoff, M.; Kelly, J.; Cenko, S. B.; Li, W.; Filippenko, A. V. (2011). "Supernova 2011dm in UGC 11861 = PSN J21564159+7317489". Central Bureau Electronic Telegrams (2745): 1. Bibcode: 2011CBET.2745....1K. http://www.cbat.eps.harvard.edu/iau/cbet/002700/CBET002745.txt.
- ↑ "SN 2011dm". IAU. https://www.wis-tns.org/object/2011dm.
External links
- UGC 11861 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
21h 56m 24.3586s, +73° 15′ 37.733″
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