2015ApJ...798L..45V

Query : 2015ApJ...798L..45V

2015ApJ...798L..45V - Astrophys. J., 798, L45 (2015/January-2)

Forty-seven Milky Way-sized, extremely diffuse galaxies in the Coma cluster.

VAN DOKKUM P.G., ABRAHAM R., MERRITT A., ZHANG J., GEHA M. and CONROY C.

Abstract (from CDS):

We report the discovery of 47 low surface brightness objects in deep images of a 3°x3° field centered on the Coma cluster, obtained with the Dragonfly Telephoto Array. The objects have central surface brightness µ(g, 0) ranging from 24-26 mag/arcsec2 and effective radii r_eff= 3''-10'', as measured from archival Canada-France-Hawaii Telescope images. From their spatial distribution we infer that most or all of the objects are galaxies in the Coma cluster. This relatively large distance is surprising as it implies that the galaxies are very large: with r_eff= 1.5-4.6 kpc their sizes are similar to those of L_* galaxies even though their median stellar mass is only ∼6x10⁷ M_☉. The galaxies are relatively red and round, with < g - i > = 0.8 and < b/a > = 0.74. One of the 47 galaxies is fortuitously covered by a deep Hubble Space Telescope Advanced Camera for Surveys (ACS) observation. The ACS imaging shows a large spheroidal object with a central surface brightness µ₄₇₅ = 25.8 mag/arcsec2, a Sérsic index n = 0.6, and an effective radius of 7'', corresponding to 3.4 kpc at the distance of Coma. The galaxy is not resolved into stars, consistent with expectations for a Coma cluster object. We speculate that these "ultra-diffuse galaxies" may have lost their gas supply at early times, possibly resulting in very high dark matter fractions.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Coma - galaxies: evolution - galaxies: structure

Nomenclature: Table 1: [VAM2015] DFNN N=47.

Simbad objects: 54

Full paper

View the references in ADS

Number of rows : 54

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	And XIX	G	00 19 32.10	+35 02 37.1		15.6		~	168	0
2	ACO S 373	ClG	03 38 29.4	-35 27 08				~	2029	0
3	NAME Virgo Cluster	ClG	12 30 47.8	+12 23 07				~	7107	0
4	SMDG J1253152+274115	LSB	12 53 15.1	+27 41 15				~	14	0
5	[BKY2023] 1407	LSB	12 53 53.7	+26 56 48				~	3	0
6	[BKY2023] 1329	LSB	12 54 51.4	+26 59 46				~	3	0
7	SMDG J1255062+273727	LSB	12 55 06.161	+27 37 27.32		20.73	20.45	~	10	0
8	[ARF2020] COMA 43 5882	LSB	12 55 10.512	+28 33 32.21		21.04	20.75	~	5	0
9	SMDG J1255301+273451	LSB	12 55 30.103	+27 34 50.33		20.99	20.94	~	7	0
10	SMDG J1255481+263352	LSB	12 55 48.1	+26 33 53				~	9	0
11	SMDG J1255554+272736	LSB	12 55 55.40	+27 27 35.9		20.80	20.69	~	13	0
12	SMDG J1256129+273250	LSB	12 56 12.95	+27 32 50.3	21.67	21.15	21.18	~	13	0
13	SMDG J1256227+281955	LSB	12 56 22.687	+28 19 54.26		20.90	20.48	~	12	0
14	SMDG J1256284+273707	LSB	12 56 28.41	+27 37 06.3		20.18	20.06	~	12	0
15	[ARF2020] COMA 42 7038	LSB	12 56 28.944	+27 46 19.23		21.50	20.93	~	6	0
16	SMDG J1256297+282640	LSB	12 56 29.678	+28 26 40.47		19.86	20.60	~	13	0
17	[ARF2020] COMA 32 6293	LSB	12 56 52.375	+27 52 29.65		21.20	20.73	~	5	0
18	SMDG J1257017+282325	LSB	12 57 01.687	+28 23 24.73		19.14	18.50	~	31	0
19	SMDG J1257189+270556	LSB	12 57 18.922	+27 05 55.62		20.00	20.55	~	11	0
20	SDSS J125801.11+271126.4	LSB	12 58 01.119	+27 11 26.47	20.66	20.02	19.68	~	19	0
21	SMDG J1258050+274359	LSB	12 58 05.047	+27 43 58.50		19.92	19.97	~	11	0
22	[ARF2020] COMA 32 5262	LSB	12 58 07.824	+27 54 45.48		20.79	20.64	~	9	0
23	SMDG J1258104+271912	LSB	12 58 10.411	+27 19 11.48	21.32	20.28	20.08	~	11	0
24	SMDG J1258164+275330	LSB	12 58 16.351	+27 53 29.27		20.29	20.23	~	10	0
25	[ARF2020] COMA 21 7180	LSB	12 58 57.919	+27 44 48.47	23.07	21.56	21.01	~	6	0
26	[ARF2020] COMA 22 6669	LSB	12 59 09.360	+27 49 48.32	22.21	21.34	20.98	~	9	0
27	[ARF2020] COMA 24 4030	LSB	12 59 09.528	+29 00 24.47		20.28	19.98	~	18	0
28	SDSS J125913.94+290718.1	LSB	12 59 13.942	+29 07 18.18		20.25	20.02	~	12	0
29	SMDG J1259163+281751	LSB	12 59 16.303	+28 17 50.67		19.95	19.84	~	12	0
30	SDSS J125923.65+272122.3	LSB	12 59 23.656	+27 21 22.39		20.78	20.62	~	6	0
31	SMDG J1259238+274727	LSB	12 59 23.85	+27 47 27.2	21.16	20.23	19.82	~	15	0
32	SMDG J1259304+274451	LSB	12 59 30.46	+27 44 50.4	20.82	19.79	19.60	~	17	0
33	ACO 1656	ClG	12 59 44.40	+27 54 44.9				~	5141	2
34	SMDG J1259487+274639	LSB	12 59 48.72	+27 46 39.0	21.88	20.46	20.07	~	18	0
35	[ARF2020] COMA 22 5585	LSB	13 00 09.055	+28 08 27.14		20.92	20.47	~	9	0
36	[ARF2020] COMA 22 6621	LSB	13 00 18.866	+27 48 06.99	22.48	21.32	21.08	~	11	0
37	GMP 2748	LSB	13 00 20.61	+27 47 12.3	20.15	19.20	18.76	~	27	0
38	[ARF2020] COMA 21 5651	LSB	13 00 35.614	+27 29 51.12		20.95	20.70	~	8	0
39	SMDG J1300473+264700	LSB	13 00 47.280	+26 46 59.30		20.73	20.07	~	13	0
40	SMDG J1300580+265835	LSB	13 00 57.996	+26 58 34.72		19.37	18.43	~	145	0
41	SMDG J1301191+270315	LSB	13 01 19.090	+27 03 15.21		20.11	19.69	~	17	0
42	SMDG J1301303+282229	LSB	13 01 30.341	+28 22 28.55		20.25	20.20	~	21	0
43	SMDG J1301561+280722	LSB	13 01 56.165	+28 07 22.22		20.80	20.46	~	9	0
44	SMDG J1301582+275012	LSB	13 01 58.205	+27 50 11.91		19.89	19.45	~	61	0
45	[ARF2020] COMA 11 3168	LSB	13 02 00.082	+27 19 50.75		19.91	19.48	~	6	0
46	[ARF2020] COMA 12 2574	LSB	13 02 04.121	+27 47 54.33		19.60	19.22	~	6	0
47	SMDG J1302165+285717	LSB	13 02 16.601	+28 57 16.76		20.06	19.81	~	17	0
48	SMDG J1302254+281358	LSB	13 02 25.5	+28 13 58				~	8	0
49	SMDG J1302334+283452	LSB	13 02 33.4	+28 34 51				~	12	0
50	SMDG J1302578+274724	LSB	13 02 57.8	+27 47 25				~	9	0
51	SMDG J1304052+274804	LSB	13 04 05.1	+27 48 05				~	8	0
52	M 101	GiP	14 03 12.583	+54 20 55.50	8.46	7.86	7.76	~	3138	2
53	ACO 2667	ClG	23 51 39.37	-26 05 02.7				~	190	0
54	NAME Local Group	GrG	~	~				~	9325	0

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