CENTAURUS A/M83 GROUP

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. 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.
This group is sometimes identified as one group^[1][2] and sometimes identified as two groups.^[3] 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.

Contents

Members

Member identification

Member list

References

Members

Member identification

The brightest group members were frequently identified in early galaxy group identification surveys.^[1][2] 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.^[6] 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.^[7] 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.^[8] Several optical surveys later identified 20 more candidate objects to the group.^[9][10][11]

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. Note that Karachentsev divides this group into two subgroups centered around Centaurus A and Messier 83.

'Members of the Centaurus A Subgroup'

Name	Type[12]	R.A. (J2000)12	Dec. (J2000)12	Redshift (km/s)12	Apparent Magnitude12
Cen 7	Sph				17.3
Cen N					17.5
Centaurus A (NGC 5128)	S0 pec			547 ± 5	7.8
Centaurus A-dE1	dSph				19.3
Centaurus A-dE3	dE				17.1
HIPASS J1337-39	Im			492 ± 4	16.5
HIPASS J1348-37				581 ± 8	16.9
HIPASS J1351-47				529 ± 6
KKs 51	E/Sph				16.7
KKs 55	Sph				18.5
KKs 57	Sph				18.1
LEDA 166152	dI			617 ± 4	16.3
LEDA 166167	dI/dSph				18
LEDA 166172	dSph				18.5
LEDA 166175	dSph				19.2
LEDA 166179	dSph				18
NGC 4945	SB(s)cd			563 ± 3	9.3
NGC 5102	SA0			468 ± 2	10.4
NGC 5206	SB(r)0			571 ± 10	11.6
NGC 5237	I0			361 ± 4	13.2
PGC 45104	IABm
PGC 45717	I0 pec			1853 ± 32	13.3
PGC 45916	dE			784 ± 31	14.1
PGC 46663	IBm			741	16.1
PGC 46680	Im				16.6
PGC 47171	IABm			516 ± 3	12.9
PGC 48515	dE				17.6
PGC 48738	IB(s)m			545 ± 2	14.0
PGC 49615	dS0/Im			561 ± 32	14.8

'Members of the M83 Subgroup'

Name	Type[12]	R.A. (J2000)12	Dec. (J2000)12	Redshift (km/s)12	Apparent Magnitude12
AM 1321-304	dIm			487 ± 1	16.7
Centaurus A-dE2	dE/Im				17.6
Centaurus A-dE4	dSph				19.
HIDEEP J1336-3321				591	17.3
IC 4247	S			274 ± 65	14.4
IC 4316	IBm pec			674 ± 53	15.0
KK 208	dI			381	14.3
LEDA 166163	dI			571 ± 3	17.1
LEDA 166164	dSph				17.6
M83	SAB(s)c			513 ± 2	8.2
NGC 5253	Im pec			407 ± 3	10.9
NGC 5264	IB(s)m			478 ± 3	12.6
PGC 47885				13848	15.8
PGC 48111	Im			587 ± 3	15.0
UGCA 365	Im			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. Although HIPASS J1337-39 is only listed as a possible member of the M83 Subgroup in the later list published by Karachentsev, later analyses indicate that this galaxy is within the subgroup.^[14]

References

1. Nearby Galaxies Catalog, R. B. Tully, , , Cambridge University Press, 1988, ISBN 0-521-35299-1
2. Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members, P. Fouque, E. Gourgoulhon, P. Chamaraux, G. Paturel, , , Astronomy and Astrophysics Supplement, 1992
3. General study of group membership. II - Determination of nearby groups, A. Garcia, , , Astronomy and Astrophysics Supplement, 1993
4. Nearby Galaxies Catalog, R. B. Tully, , , Cambridge University Press, 1988, ISBN 0-521-35299-1
5. Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members, P. Fouque, E. Gourgoulhon, P. Chamaraux, G. Paturel, , , Astronomy and Astrophysics Supplement, 1992
6. Discovery of Numerous Dwarf Galaxies in the Two Nearest Groups of Galaxies, S. Cote, K. C. Freeman, C. Carigan, P. J. Quinn, , , Astronomical Journal, 1997
7. New Galaxies Discovered in the First Blind H I Survey of the Centaurus A Group, 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, , , Astrophysical Journal, 1999
8. HIDEEP - an extragalactic blind survey for very low column-density neutral hydrogen, 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, , , Monthly Notices of the Royal Astronomical Society, 2003
9. Testing the Surface Brightness Fluctuations Method for Dwarf Elliptical Galaxies in the Centaurus A Group, H. Jerjen, K. C. Freeman, B. Binggeli, , , Astronomical Journal, 2000
10. Surface BR Photometry of Newly Discovered Dwarf Elliptical Galaxies in the Nearby Sculptor and Centaurus A Groups, H. Jerjen, K. C. Freeman, B. Binggeli, , , Astronomical Society, 2000
11. New distances to galaxies in the Centaurus A group, 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, , , Astronomy and Astrophysics, 2002
12. NASA/IPAC Extragalactic Database
13. NASA/IPAC Extragalactic Database
14. Star formation history and evolution of gas-rich dwarf galaxies in the Centaurus A group, M. Grossi, M. J. Disney, B. J. Pritzl, P. M. Knezek, J. S. Gallagher, R. F. Minchin, K. C> Freeman, , , Monthly Notices of the Royal Astronomical Society, 2006