Astronomy:NGC 4848
| NGC 4848 | |
|---|---|
| File:NGC4848 - HST - Potw2029a.tif Hubble Space Telescope (HST) image of the galaxy | |
| Observation data (J2000 epoch) | |
| Constellation | Coma Berenices |
| Right ascension | 12h 58m 05.6s[1] |
| Declination | +28° 14′ 34″[1] |
| Redshift | 0.023513 ± 0.000033 |
| Helio radial velocity | 7,049 ± 10 km/s[1] |
| Distance | 340 ± 15 Mly (104 ± 4.5 Mpc)[1] |
| Group or cluster | Coma cluster |
| Apparent magnitude (V) | 13.7[2] |
| Characteristics | |
| Type | SBab: sp[1] |
| Apparent size (V) | 1.6′ × 0.5′[1] |
| Notable features | Hydrogen tail |
| Other designations | |
| UGC 8082, MCG +05-31-039, CGCG 160-055, PGC 44405, 5C 04.058[1] | |
NGC 4848 is a barred spiral galaxy in the constellation Coma Berenices. It is circa 340 million light-years from Earth, which, given its apparent dimensions, means that NGC 4848 is about 170,000 light years across. It was discovered by Heinrich d'Arrest on April 21, 1865.[3] It is considered part of the Coma Cluster, which is in its northwest part. The galaxy has been stripped of its gas as it passed through the cluster.[4]
Characteristics
NGC 4848 is a spiral galaxy viewed nearly edge-on that is classified as SBab by de Vaucouleurs. Its nucleus is active, and it has been categorised as an HII region.[5] A number of bright HII regions form a ring around the nucleus with a radius of 5–10 arcseconds. The star formation rate is estimated to be 9 M☉ per year based on the H-alpha, ultraviolet, infrared and radio luminosity.[4]
The galaxy distribution of hydrogen gas is asymmetrical and forms a tail pointing away from the cluster center. The tail has projected dimensions of 62.5 by 18.5 kpc and an estimated hydrogen mass of 4×109 M☉. The tail was probably formed as a result of ram pressure as the galaxy passed through the Coma Cluster and its intergalactic medium at a speed of about 1,330 km/s, starting 200 million years ago according to Fossati et al.,[4] while a previous study indicated a timeline of 400 million years.[6] The lost hydrogen is estimated to comprise two thirds of the original hydrogen content of the galaxy.[6] A few star-forming regions, probably HII regions, are in the tail.[4]
A dwarf galaxy may cross the disk of NGC 4848; however, its mass is too low to be a source of the hydrogen tail.[6]
See also
- NGC 4921, a spiral galaxy in the Coma Cluster that has lost its hydrogen
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "NASA/IPAC Extragalactic Database". Results for NGC 4848. http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+4848.
- ↑ "Revised NGC Data for NGC 4848". http://spider.seds.org/ngc/revngcic.cgi?NGC4848.
- ↑ Seligman, Courtney. "NGC 4848 (= PGC 44405)". http://cseligman.com/text/atlas/ngc48.htm#4848.
- ↑ 4.0 4.1 4.2 4.3 Fossati, Matteo; Gavazzi, Giuseppe; Boselli, Alessandro; Fumagalli, Michele (August 2012). "65 kpc of ionized gas trailing behind NGC 4848 during its first crossing of the Coma cluster". Astronomy & Astrophysics 544: A128. doi:10.1051/0004-6361/201219933. Bibcode: 2012A&A...544A.128F.
- ↑ Gavazzi, G.; Savorgnan, G.; Fumagalli, Mattia (October 2011). "The complete census of optically selected AGNs in the Coma supercluster: the dependence of AGN activity on the local environment". Astronomy & Astrophysics 534: A31. doi:10.1051/0004-6361/201117461. Bibcode: 2011A&A...534A..31G. https://cdsarc.unistra.fr/viz-bin/nph-Cat/html?J/A+A/534/A31/table4.dat.[yes|permanent dead link|dead link}}]
- ↑ 6.0 6.1 6.2 Vollmer, B.; Braine, J.; Balkowski, C.; Cayatte, V.; Duschl, W. J. (August 2001). "12CO(1-0) observations of NGC 4848: A Coma galaxy after stripping". Astronomy & Astrophysics 374 (3): 824–838. doi:10.1051/0004-6361:20010800. Bibcode: 2001A&A...374..824V.
External links
- NGC 4848 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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