Centaurus A/M83 Group
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| Centaurus A/M83 group | |
 The Centaurus A galaxy is the largest and most massive galaxy in the group |
|
| Observation data (Epoch ) | |
|---|---|
| Constellation(s) | Hydra, Centaurus, & Virgo[1] |
| Right ascension | 13h 20m[2] |
| Declination | -44° 58′[2] |
| Number of galaxies | 44[3] |
| Brightest member | Centaurus A[3] |
| Other designations | |
| NGC 5128 Group,[2] Centaurus A Group,[2] LGG 344[2] | |
| See also: Galaxy groups and clusters, List of galaxy clusters | |
The Centaurus A/M83 Group is a complex group of galaxies in the constellations Hydra, Centaurus, and Virgo. The group may be roughly divided into two subgroups. The Cen A Subgroup, at a distance of 11.9 Mly (3.66 Mpc), is centered around Centaurus A, a nearby radio galaxy.[3] The M83 Subgroup, at a distance of 14.9 Mly (4.56 Mpc), is centered around the Messier 83 (M83), a face-on spiral galaxy.[3]
This group is sometimes identified as one group[4][5] and sometimes identified as two groups.[6] Hence, some references will refer to two objects named the Centaurus A Group and the M83 Group. However, the galaxies around Centaurus A and the galaxies around M83 are physically close to each other, and both subgroups appear not to be moving relative to each other.[3]
Contents |
[edit] Members
[edit] Member identification
The brightest group members were frequently identified in early galaxy group identification surveys.[4][5] However, many of the dwarf galaxies in the group were only identified in more intensive studies. One of the first of these identified 145 faint objects on optical images from the UK Schmidt Telescope and followed these up in hydrogen line emission with the Parkes Radio Telescope and in the hydrogen-alpha spectral line with the Siding Spring 2.3 m Telescope. This identified 20 dwarf galaxies as members of the group.[7] The HIPASS survey, which was a blind radio survey for hydrogen spectral line emission, found five uncatalogued galaxies in the group and also identified five previously-catalogued galaxies as members.[8] An additional dwarf galaxy was identified as a group member in the HIDEEP survey, which was a more intensive radio survey for hydrogen emission within a smaller region of the sky.[9] Several optical surveys later identified 20 more candidate objects to the group.[10][11][12]
[edit] Member list
The table below lists galaxies that have been identified as associated with the Centaurus A/M83 Group by I. D. Karachentsev and collaborators.[12][3] Note that Karachentsev divides this group into two subgroups centered around Centaurus A and Messier 83.
| Name | Type[2] | R.A. (J2000)[2] | Dec. (J2000)[2] | Redshift (km/s)[2] | Apparent Magnitude[2] |
|---|---|---|---|---|---|
| Cen 7 | Sph | 13h 11m 13.8s | -38° 53′ 56″ | 17.3 | |
| Cen N | 13h 48m 09.1s | -47° 33′ 54″ | 17.5 | ||
| Centaurus A (NGC 5128) | S0 pec | 13h 25m 27.6s | -43° 01′ 09″ | 547 ± 5 | 7.8 |
| Centaurus A-dE1 | dSph | 13h 12m 45.2s | -41° 49′ 57″ | 19.3 | |
| Centaurus A-dE3 | dE | 13h 46m 00.8s | -36° 19′ 44″ | 17.1 | |
| HIPASS J1337-39 | Im | 13h 37m 25.3s | -39° 53′ 48″ | 492 ± 4 | 16.5 |
| HIPASS J1348-37 | 13h 48m 47.0s | -37° 58′ 29″ | 581 ± 8 | 16.9 | |
| HIPASS J1351-47 | 13h 51m 12.0s | -46° 58′ 12.9″ | 529 ± 6 | ||
| KKs 51 | E/Sph | 12h 44m 21.5s | -42° 56′ 23″ | 16.7 | |
| KKs 55 | Sph | 13h 22m 12.8s | -42° 43′ 41″ | 18.5 | |
| KKs 57 | Sph | 13h 41m 38.1s | -42° 34′ 55″ | 18.1 | |
| LEDA 166152 | dI | 13h 05m 02.1s | -40° 04′ 58″ | 617 ± 4 | 16.3 |
| LEDA 166167 | dI/dSph | 13h 27m 27.8s | -45° 21′ 10″ | 18 | |
| LEDA 166172 | dSph | 13h 43m 36.0s | -43° 46′ 11″ | 18.5 | |
| LEDA 166175 | dSph | 13h 46m 16.8s | -45° 41′ 05″ | 19.2 | |
| LEDA 166179 | dSph | 13h 48m 46.4s | -46° 59′ 46″ | 18 | |
| NGC 4945 | SB(s)cd | 13h 05m 27.5s | -49° 28′ 06″ | 563 ± 3 | 9.3 |
| NGC 5102 | SA0 | 13h 21m 57.6s | -36° 37′ 49″ | 468 ± 2 | 10.4 |
| NGC 5206 | SB(r)0 | 13h 33m 44.0s | -48° 09′ 04″ | 571 ± 10 | 11.6 |
| NGC 5237 | I0 | 13h 37m 39.0s | -42° 50′ 49″ | 361 ± 4 | 13.2 |
| PGC 45104 | IABm | 13h 03m 33.6s | -46° 35′ 06″ | ||
| PGC 45717 | I0 pec | 13h 10m 32.9s | -46° 59′ 27.3″ | 1853 ± 32 | 13.3 |
| PGC 45916 | dE | 13h 13m 09.1s | -44° 53′ 24″ | 784 ± 31 | 14.1 |
| PGC 46663 | IBm | 13h 21m 47.4s | -45° 03′ 42″ | 741 | 16.1 |
| PGC 46680 | Im | 13h 22m 02.0s | 32° 07′ | 16.6 | |
| PGC 47171 | IABm | 13h 27m 37.4s | -41° 28′ 50″ | 516 ± 3 | 12.9 |
| PGC 48515 | dE | 13h 42m 05.6s | -45° 12′ 18″ | 17.6 | |
| PGC 48738 | IB(s)m | 13h 45m 00.5s | -41° 51′ 40″ | 545 ± 2 | 14.0 |
| PGC 49615 | dS0/Im | 13h 57m 01.4s | -35° 19′ 59″ | 561 ± 32 | 14.8 |
| Name | Type[2] | R.A. (J2000)[2] | Dec. (J2000)[2] | Redshift (km/s)[2] | Apparent Magnitude[2] |
|---|---|---|---|---|---|
| AM 1321-304 | dIm | 13h 24m 36.2s | -30° 58′ 19″ | 487 ± 1 | 16.7 |
| Centaurus A-dE2 | dE/Im | 13h 21m 32.4s | -31° 53′ 11″ | 17.6 | |
| Centaurus A-dE4 | dSph | 13h 46m 40.4s | -29° 58′ 41″ | 19. | |
| HIDEEP J1336-3321 | 13h 36m 56.1s | -33° 21′ 23″ | 591 | 17.3 | |
| IC 4247 | S | 13h 26m 44.4s | -30° 21′ 45″ | 274 ± 65 | 14.4 |
| IC 4316 | IBm pec | 13h 40m 18.4s | -28° 53′ 32″ | 674 ± 53 | 15.0 |
| KK 208 | dI | 13h 36m 35.5s | -29° 34′ 17″ | 381 | 14.3 |
| LEDA 166163 | dI | 13h 21m 08.2s | -31° 31′ 45″ | 571 ± 3 | 17.1 |
| LEDA 166164 | dSph | 13h 22m 56.2s | -33° 34′ 22″ | 17.6 | |
| M83 | SAB(s)c | 13h 37m 00.9s | -29° 51′ 57″ | 513 ± 2 | 8.2 |
| NGC 5253 | Im pec | 13h 39m 55.9s | -31° 38′ 24″ | 407 ± 3 | 10.9 |
| NGC 5264 | IB(s)m | 13h 41m 36.7s | -29° 54′ 47″ | 478 ± 3 | 12.6 |
| PGC 47885 | 13h 35m 08.1s | -30° 07′ 03″ | 13848 | 15.8 | |
| PGC 48111 | Im | 13h 37m 20.0s | -28° 02′ 42″ | 587 ± 3 | 15.0 |
| UGCA 365 | Im | 13h 36m 31.1s | -29° 14′ 06″ | 573 ± 1 | 15.4 |
Additionally, ESO 219-010, PGC 39032, and PGC 51659 are listed as possibly being members of the Centaurus A Subgroup, and ESO 381-018, NGC 5408, and PGC 43048 are listed as possibly being members of the M83 Subgroup.[3] Although HIPASS J1337-39 is only listed as a possible member of the M83 Subgroup in the later list published by Karachentsev,[3] later analyses indicate that this galaxy is within the subgroup.[13]
[edit] References
- ^ Kepple, George Robert; Glen W. Sanner (1998). The Night Sky Observer's Guide, Volume 2. Willmann-Bell, Inc., 73. ISBN 0-943396-60-3.
- ^ a b c d e f g h i j k l m n o NASA/IPAC Extragalactic Database. Results for NGC 5128 Group. Retrieved on 2006-11-22.
- ^ a b c d e f g h I. D. Karachentsev (2005). "The Local Group and Other Neighboring Galaxy Groups". Astronomical Journal 129: 178-188. doi:.
- ^ a b R. B. Tully (1988). Nearby Galaxies Catalog. Cambridge: Cambridge University Press. ISBN 0-521-35299-1.
- ^ a b P. Fouque, E. Gourgoulhon, P. Chamaraux, G. Paturel (1992). "Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members". Astronomy and Astrophysics Supplement 93: 211-233.
- ^ A. Garcia (1993). "General study of group membership. II - Determination of nearby groups". Astronomy and Astrophysics Supplement 100: 47-90.
- ^ S. Cote, K. C. Freeman, C. Carigan, P. J. Quinn (1997). "Discovery of Numerous Dwarf Galaxies in the Two Nearest Groups of Galaxies". Astronomical Journal 114: 1313. doi:.
- ^ G. D. Banks, M. J. Disney, P. M. Knezek, H. Jerjen, D. G. Barnes, R. Bhatal, W. J. G. de Blok, P. J. Boyce, R. D. Ekers, K. C. Freeman, B. K. Gibson, P. A. Henning, V. Kilborn, B. Koribalski, R. C. Kraan-Korteweg, D. F. Malin, R. F. Minchin, J. R. Mould, T. Oosterloo, R. M. Price, M. E. Putman, S. D. Ryder, E. M. Sadler, L. Staveley-Smith, I. Stewart, F. Stootman, R. A. Vaile, R. L. Webster, A. E. Wright (1999). "New Galaxies Discovered in the First Blind H I Survey of the Centaurus A Group". Astrophysical Journal 524: 612-622. doi:.
- ^ R. F. Minchin, M. J. Disney, P. J. Boyce, W. J. G. de Blok, Q. A. Parker, G. D. Banks, K. C. Freeman, D. A. Garcia, B. K. Gibson, M. Grossi, R. F. Haynes, P. M. Knezek, R. H. Lang, D. F. Malin, R. M. Price, I. M. Stewart, A. E. Wright (2003). "HIDEEP - an extragalactic blind survey for very low column-density neutral hydrogen". Monthly Notices of the Royal Astronomical Society 346: 787-802. doi:.
- ^ H. Jerjen, K. C. Freeman, B. Binggeli (2000). "Testing the Surface Brightness Fluctuations Method for Dwarf Elliptical Galaxies in the Centaurus A Group". Astronomical Journal 119: 166-176. doi:.
- ^ H. Jerjen, K. C. Freeman, B. Binggeli (2000). "Surface BR Photometry of Newly Discovered Dwarf Elliptical Galaxies in the Nearby Sculptor and Centaurus A Groups". Astronomical Society 119: 593-608.
- ^ a b I. D. Karachentsev, M. E. Sharina, A. E. Dolphin, E. K. Grebel, D. Geisler, P. Guhathakurta, P. W. Hodge, V. E. Karachetseva, A. Sarajedini, P. Seitzer (2002). "New distances to galaxies in the Centaurus A group". Astronomy and Astrophysics 385: 21-31. doi:.
- ^ M. Grossi, M. J. Disney, B. J. Pritzl, P. M. Knezek, J. S. Gallagher, R. F. Minchin, K. C> Freeman (2006). "Star formation history and evolution of gas-rich dwarf galaxies in the Centaurus A group". Monthly Notices of the Royal Astronomical Society 374: 107-130.
