M81 Group

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The M81 Group is a galaxy group in the constellations Ursa Major and Camelopardalis that includes the galaxies Messier 81 and Messier 82. It also contains several galaxies with high apparent brightnesses.

Members[]

Name	Type	Right ascension	Declination	Redshift (km/s)	App. Magnitude
Arp's Loop		09^h 57^m 32.6^s	+69° 17′ 00″	99	16.1
DDO 78	Im	10^h 26^m 27.4^s	+67° 39′ 16″	55	15.8
F8D1	dE	09^h 44^m 47.1^s	+67° 26′ 19″		13.9
FM1	dSph	09^h 45^m 10.0^s	+68° 45′ 54″		17.5
HIJASS J1021+6842		10^h 21^m 00.0^s	+68° 42′ 00″	46	20
Holmberg I	IAB(s)m	09^h 40^m 32.3^s	+71° 10′ 56″	139	13.0
Holmberg II	Im	08^h 19^m 05.0^s	+70° 43′ 12″	142	11.1
Holmberg IX	Im	09^h 57^m 32.0^s	+69° 02′ 45″	46	14.3
HS 117	I	10^h 21^m 25.2^s	+71° 06′ 51″	-37	16.5
IC 2574	SAB(s)m	10^h 28^m 23.5^s	+68° 24′ 44″		17.0
IKN		10^h 08^m 05.9^s	+68° 23′ 57″		16.5
KKH 57	dSph	10^h 00^m 16.0^s	+63° 11′ 06″		18.5
Messier 81	SA(s)ab	09^h 55^m 33.2^s	+69° 03′ 55″	-34	6.9
Messier 81 Dwarf A	I	08^h 23^m 56.0^s	+71° 01′ 45″	113	16.5
Messier 82	I0	09^h 55^m 52^s	+69° 40′ 47″	203	9.3
NGC 2366	IB(s)m	07^h 28^m 54.7^s	+69° 12′ 57″	80	11.4
NGC 2403	SAB(s)cd	07^h 28^m 51.4^s	+65° 36′ 09″	131	8.9
NGC 2976	SAc pec	09^h 47^m 15.5^s	+67° 54′ 59″	3	10.8
NGC 3077	I0 pec	10^h 03^m 19.1^s	+67° 44′ 02″	14	10.6
NGC 4236	SB(s)dm	12^h 16^m 42^s	+69° 27′ 45″	0	10.1
PGC 28529	Im	09^h 53^m 48.5^s	+68° 58′ 08″	-40	17.1
PGC 28731	dE	09^h 57^m 03.1^s	+68° 35′ 31″	-135	15.6
PGC 29231	dE	10^h 04^m 41.1^s	+68° 15′ 22″		16.7
PGC 31286	dSph	10^h 34^m 29.8^s	+66° 00′ 30″		16.7
PGC 32667	Im	10^h 52^m 57.1^s	+69° 32′ 58″	116	14.9
UGC 4459	Im	08^h 34^m 07.2^s	+66° 10′ 54″	20	14.5
UGC 4483		08^h 37^m 03.0^s	+69° 46′ 31″	156	15.1
UGC 5428	Im	10^h 05^m 06.4^s	+66° 33′ 32″	-129	18
UGC 5442	Im	10^h 07^m 01.9^s	+67° 49′ 39″	-18	18
UGC 5692	13.5	10^h 30^m 35.0^s	+70° 37′ 07.2″	56	13.5
UGC 6456	Pec	11^h 27^m 59.9^s	+78° 59′ 39″	-103	14.5
UGC 7242	Scd	12^h 14^m 08.4^s	+66° 05′ 41″	68	14.6
UGC 8201	Im	13^h 06^m 24.9^s	+67° 42′ 25″	31	12.8
UGCA 133	Im	07^h 34^m 11.4^s	+66° 53′ 10″		15.6

Interactions within the group[]

Messier 81, Messier 82 and NGC 3077 are all strongly interacting with each other. The gravitational interactions have stripped some hydrogen gas away from all three galaxies, leading to the formation of filamentary gas structures within the group. Moreover, the interactions have also caused some interstellar gas to fall into the centers of Messier 82 and NGC 3077, which has led to strong starburst activity (or the formation of many stars) within the centers of these two galaxies.

M81 Group

Members[]

Interactions within the group[]

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