2014ApJ...788..188S

Query : 2014ApJ...788..188S

2014ApJ...788..188S - Astrophys. J., 788, 188 (2014/June-3)

Faint dwarfs in nearby groups.

SPELLER R. and TAYLOR J.E.

Abstract (from CDS):

The number and distribution of dwarf satellite galaxies remain a critical test of cold dark matter-dominated structure formation on small scales. Until recently, observational information about galaxy formation on these scales has been limited mainly to the Local Group. We have searched for faint analogues of Local Group dwarfs around nearby bright galaxies, using a spatial clustering analysis of the photometric catalog of the Sloan Digital Sky Survey (SDSS) Data Release 8. Several other recent searches of SDSS have detected clustered satellite populations down to Δm_r≡ (m_r, sat_- m_r, main_) ∼ 6-8, using photometric redshifts to reduce background contamination. SDSS photometric redshifts are relatively imprecise, however, for faint and nearby galaxies. Instead, we use angular size to select potential nearby dwarfs and consider only the nearest isolated bright galaxies as primaries. As a result, we are able to detect an excess clustering signal from companions down to Δm_r= 12, 4 mag fainter than most recent studies. We detect an overdensity of objects at separations <400 kpc, corresponding to about 4.6±0.5 satellites per central galaxy, consistent with the satellite abundance expected from the Local Group, given our selection function. Although the sample of satellites detected is incomplete by construction, since it excludes the least and most compact dwarfs, this detection provides a lower bound on the average satellite luminosity function, down to luminosities corresponding to the faintest "classical" dwarfs of the Local Group.

Abstract Copyright: ∼

Journal keyword(s): dark matter - galaxies: dwarf - galaxies: formation - galaxies: groups: general - galaxies: luminosity function, mass function - Local Group

Simbad objects: 62

Full paper

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Number of rows : 62

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	MCG-03-01-015	G	00 01 57.9	-15 27 50		11.50	11.10	10.93	~	782	2
2	NAME Andromeda XX	G	00 07 30.70	+35 07 56.4			18.2		~	77	0
3	And XIX	G	00 19 32.10	+35 02 37.1			15.6		~	168	0
4	NAME Andromeda XXVI	G	00 23 45.6	+47 54 58			17.3		~	76	0
5	NAME Cetus Dwarf Galaxy	G	00 26 10.8	-11 03 14			13.2		~	257	0
6	NAME Andromeda XXV	G	00 30 08.9	+46 51 07			14.8		~	120	0
7	NAME Andromeda III	G	00 35 33.8	+36 29 52			14.4		~	309	0
8	NAME Andromeda XVII	G	00 37 07.0	+44 19 20			15.8		~	101	0
9	NAME Andromeda XXVII	G	00 37 27.1	+45 23 13			16.7		~	82	0
10	NGC 185	Sy2	00 38 57.9400026024	+48 20 15.035874648		9.10	9.2		~	840	1
11	M 110	GiG	00 40 22.0572349992	+41 41 07.507220136		8.92	8.07		~	1370	1
12	M 32	GiG	00 42 41.82480	+40 51 54.6120	9.51	9.03	8.08		~	2236	2
13	M 31	AGN	00 42 44.330	+41 16 07.50	4.86	4.36	3.44		~	13622	1
14	NAME Andromeda I	G	00 45 39.8	+38 02 28		13.9	12.7		~	355	0
15	NAME Andromeda XI	G	00 46 20.0	+33 48 05			17.5		~	130	0
16	NAME Andromeda XII	G	00 47 27.0	+34 22 29			18.3		~	124	0
17	NAME Andromeda XIV	G	00 51 35.0	+29 41 49			15.9		~	132	0
18	NAME Andromeda XIII	G	00 51 51.0	+33 00 16			18.1		~	128	0
19	NAME SMC	G	00 52 38.0	-72 48 01		2.79	2.2		~	12317	1
20	NAME Andromeda IX	G	00 52 53.0	+43 11 45			16.3		~	176	1
21	NAME Pisces V	G	00 59 29.8	+32 22 36			14.4		~	149	0
22	NAME Sculptor Dwarf Galaxy	G	01 00 09.4	-33 42 32		9.79	8.6	8.81	~	1498	4
23	NAME Pisces I	G	01 03 55.0	+21 53 06		16.18	14.3		~	404	0
24	IC 1613	GiC	01 04 48.4071	+02 07 10.185		10.42	10.01	9.77	~	1316	2
25	NAME Andromeda X	G	01 06 33.70	+44 48 15.8			16.6		~	125	1
26	NAME Andromeda V	G	01 10 17.1	+47 37 41			15.3		~	215	0
27	NAME Andromeda XV	G	01 14 18.7	+38 07 03			14.6		~	123	0
28	NAME Andromeda II	G	01 16 29.8	+33 25 09			11.7		~	402	0
29	NAME Andromeda XXIV	G	01 18 30.0	+46 21 58			16.3		~	64	0
30	NAME Andromeda XXII	G	01 27 40.0	+28 05 25			18.0		~	95	0
31	NAME Andromeda XXIII	G	01 29 21.8	+38 43 08			14.2		~	88	0
32	M 33	GiG	01 33 50.8965749232	+30 39 36.630403128	6.17	6.27	5.72		~	6226	1
33	NAME Segue 2	G	02 19 16.0	+20 10 31			15.2		~	299	0
34	MCG-06-07-001	G	02 39 59.3	-34 26 57		9.02	7.4		~	1894	1
35	NAME Magellanic Clouds	GrG	03 00	-71.0					~	7988	0
36	NAME LMC	G	05 23 34.6	-69 45 22			0.4		~	19090	0
37	ESO 206-20A	G	06 41 36.7	-50 57 58		22.14	11.0	19.47	~	1190	0
38	NAME UMa II Galaxy	G	08 51 30.0	+63 07 48			13.3		~	410	0
39	Z 64-73	G	10 08 28.12	+12 18 23.4		11.3	10.0		~	1284	1
40	NAME UMa I Galaxy	G	10 34 52.80	+51 55 12.0			14.4		~	355	1
41	NAME Willman 1	G	10 49 21.0	+51 03 00			15.2		~	345	0
42	Z 126-111	G	11 13 28.13	+22 09 10.1		12.9	12.0		~	899	0
43	NAME Leo Cluster	ClG	11 30.0	+15 00					~	71	0
44	NAME Leo V	LSB	11 31 09.60	+02 13 12.0			16.0		~	234	0
45	NAME Leo IV	LSB	11 32 57.0	-00 32 00			15.1		~	419	1
46	NAME Coma Dwarf Galaxy	G	12 26 59.0	+23 54 15			14.1		~	482	1
47	NAME Virgo Cluster	ClG	12 30 47.8	+12 23 07					~	7107	0
48	NAME CVn II dSph	G	12 57 09.6	+34 19 12			16.1		~	287	2
49	ACO 1656	ClG	12 59 44.40	+27 54 44.9					~	5141	2
50	NAME CVn I dSph	G	13 28 03.5	+33 33 21			13.1		~	352	1
51	NAME Bootes III	G	13 57 07.4	+26 46 30			12.6		~	115	1
52	NAME Bootes II	G	13 58 00.0	+12 51 00			15.4		~	269	0
53	NAME Bootes Dwarf Spheroidal Galaxy	G	14 00 00.0	+14 30 00			12.8		~	491	0
54	Z 318-18	G	15 09 08.0	+67 13 21		13.60	10.6		~	1459	0
55	Z 300-12	G	17 20 14.335	+57 55 16.39		12.40	10.6		~	1428	1
56	NAME SDG	G	18 55 19.0	-30 32 43		4.5	3.6		~	2438	2
57	MCG-02-53-003	G	20 46 51.7	-12 50 54	15.75	15.18	14.83	14.46	~	470	1
58	NAME Pisces II	G	22 58 31.0	+05 57 09			16.3		~	283	0
59	NAME Andromeda VII	GiG	23 26 31.0	+50 40 33		13.6	11.8		~	222	1
60	NAME Peg dSph	GiG	23 51 46.3	+24 34 57		14.5	13.2		~	250	2
61	NAME Andromeda XXI	G	23 54 47.7	+42 28 15			14.8		~	117	0
62	NAME Local Group	GrG	~	~					~	9325	0

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