2014ApJ...782...35S

Query : 2014ApJ...782...35S

2014ApJ...782...35S - Astrophys. J., 782, 35 (2014/February-2)

Choirs H I galaxy groups: the metallicity of dwarf galaxies.

SWEET S.M., DRINKWATER M.J., MEURER G., BEKKI K., DOPITA M.A., KILBORN V. and NICHOLLS D.C.

Abstract (from CDS):

We present a recalibration of the luminosity-metallicity relation for gas-rich, star-forming dwarfs to magnitudes as faint as M_R∼ -13. We use the Dopita et al. metallicity calibrations to calibrate the relation for all the data in this analysis. In metallicity-luminosity space, we find two subpopulations within a sample of high-confidence Sloan Digital Sky Survey (SDSS) DR8 star-forming galaxies: 52% are metal-rich giants and 48% are metal-medium galaxies. Metal-rich dwarfs classified as tidal dwarf galaxy (TDG) candidates in the literature are typically of metallicity 12 + log(O/H) = 8.70±0.05, while SDSS dwarfs fainter than M_R= -16 have a mean metallicity of 12 + log(O/H) = 8.28±0.10, regardless of their luminosity, indicating that there is an approximate floor to the metallicity of low-luminosity galaxies. Our hydrodynamical simulations predict that TDGs should have metallicities elevated above the normal luminosity-metallicity relation. Metallicity can therefore be a useful diagnostic for identifying TDG candidate populations in the absence of tidal tails. At magnitudes brighter than M_R∼ -16, our sample of 53 star-forming galaxies in 9 H I gas-rich groups is consistent with the normal relation defined by the SDSS sample. At fainter magnitudes, there is an increase in dispersion of the metallicity of our sample, suggestive of a wide range of H I content and environment. In our sample, we identify three (16% of dwarfs) strong TDG candidates (12 + log(O/H) > 8.6) and four (21%) very metal-poor dwarfs (12 + log(O/H) < 8.0), which are likely gas-rich dwarfs with recently ignited star formation.

Abstract Copyright: ∼

Journal keyword(s): galaxies: abundances - galaxies: dwarf - galaxies: formation - galaxies: groups: general - galaxies: star formation - techniques: spectroscopic

Errata: erratum vol. 786, art. 75 (2014)

Simbad objects: 63

Full paper

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Number of rows : 63

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	ESO 153-13	Sy2	02 04 19.8626653176	-55 13 50.629770480		14.90		13.43		~	24	0
2	LEDA 411565	G	02 04 29.7706065312	-55 12 55.968282432						~	4	0
3	ESO 153-15	EmG	02 04 34.9851205896	-55 07 09.588518616		14.89		13.44		~	21	0
4	ESO 153-16	AG?	02 04 50.780	-55 13 01.55		15.09		14.48		~	20	0
5	LEDA 412308	AG?	02 04 54.770	-55 08 31.99						~	6	0
6	2MASS J02045713-5513334	AG?	02 04 57.1221107040	-55 13 33.826615932		17.70		16.81		~	6	0
7	LEDA 411167	EmG	02 05 00.68040	-55 15 19.6776		17.44		16.55		~	8	0
8	ESO 153-17	Sy1	02 05 05.5375932000	-55 06 42.737952528		13.92		12.71	13.6	~	46	0
9	SINGG HIPASS J0205-55 S9	EmG	02 05 23.760	-55 14 14.20						~	2	0
10	GALEXASC J025729.07-742234.1	EmG	02 57 29.230	-74 22 34.75						~	4	0
11	ESO 31-5	EmG	02 58 06.6537089784	-74 27 23.383725840		14.07		13.31	13.4	~	49	0
12	LEDA 250130	AG?	02 58 42.760	-74 26 03.55						~	6	0
13	LEDA 250148	AG?	02 58 52.430	-74 25 53.25						~	6	0
14	LEDA 440613	G	04 00 06.0390760896	-52 39 32.637544992						~	5	0
15	ACO 3193	ClG	04 00 40.820	-52 44 02.72						~	34	0
16	ESO 156-29	G	04 00 40.9286171208	-52 44 02.311333584		15.29				~	17	0
17	SINGG HIPASS J0400-52 S2	EmG	04 00 48.070	-52 41 02.81						~	3	0
18	LEDA 14278	G	04 00 53.0089136304	-52 49 38.509829364		14.89				~	16	0
19	LEDA 438049	G	04 01 08.990	-52 49 32.78						~	4	0
20	SINGG HIPASS J0400-52 S8	EmG	04 01 17.000	-52 42 08.50						~	2	0
21	IC 2029	G	04 01 17.9617913496	-52 48 02.772950076		15.73		14.31		~	11	0
22	IC 2028	G	04 01 18.2293962312	-52 42 26.901796428		14.94		13.62		~	21	0
23	SINGG HIPASS J0400-52 S9	EmG	04 01 19.290	-52 47 56.10						~	2	0
24	HCG 31	CGG	05 01 37	-04 15.4						~	132	0
25	NAME HYA SUPERCL	SCG	08 57.9	+03 10						~	204	0
26	NGC 2992	Sy2	09 45 42.045	-14 19 34.90	13.54	13.14	12.18	12.6	12.2	~	951	3
27	M 81	Sy2	09 55 33.1726556496	+69 03 55.062505368		7.89	6.94			~	4725	3
28	NGC 3431	Sy2	10 51 15.0493220328	-17 00 29.027211696		14.3		13.39	13.8	~	75	0
29	LEDA 888246	AG?	10 51 25.82832	-17 08 16.8216						~	6	0
30	GALEXASC J105125.91-170506.1	EmG	10 51 26.010	-17 05 03.61						~	5	0
31	SINGG HIPASS J1051-17 S7	EmG	10 51 33.360	-17 08 36.63						~	5	0
32	LEDA 890556	AG?	10 51 35.940	-16 59 16.80						~	7	0
33	LEDA 32573	Sy2	10 51 37.4624525568	-17 07 29.012460672		14.05				~	32	0
34	2MASS J10514280-1706347	EmG	10 51 42.80208	-17 06 34.7184						~	5	0
35	GALEXASC J105150.89-165831.6	EmG	10 51 50.910	-16 58 31.64						~	5	0
36	GALEXASC J105156.50-170504.8	EmG	10 51 56.5264820640	-17 05 03.957986508						~	3	0
37	NGC 5291	Sy2	13 47 24.5000261808	-30 24 25.449445800		15.18	14.00	13.57	12.7	~	161	1
38	LEDA 1036674	AG?	14 03 13.480	-06 06 24.17						~	5	0
39	NGC 5426	GiP	14 03 24.8484884640	-06 04 08.186632788		12.6		12.76	12.4	~	178	0
40	APG 271	IG	14 03 25.45	-06 02 59.9						~	209	0
41	NGC 5427	Sy1	14 03 26.0408044536	-06 01 50.682790236		14.67	13.96	11.54		~	307	0
42	SINGG HIPASS J1403-06 S4	EmG	14 03 34.620	-06 07 59.27						~	3	0
43	LEDA 826102	EmG	14 08 33.285	-21 36 07.29		15.89		15.10		~	6	0
44	SINGG HIPASS J1408-21 S5	EmG	14 08 39.820	-21 38 14.30						~	2	0
45	6dFGS gJ140841.1-213741	EmG	14 08 41.070	-21 37 40.81		16.40		15.38	15.4	~	10	0
46	ESO 578-26	G	14 08 41.9819874480	-21 35 49.905971808		14.33		13.38		~	33	0
47	SINGG HIPASS J1408-21 S6	EmG	14 08 52.840	-21 42 07.20						~	2	0
48	LEDA 170335	EmG	14 08 57.781	-21 38 52.80		15.59		14.54		~	9	0
49	MCG-01-41-006	AG?	16 09 36.84	-04 37 12.6		15.4		15.4	15.3	~	20	0
50	SINGG HIPASS J1956-50 S4	EmG	19 55 45.920	-50 06 15.50						~	2	0
51	2MASX J19555339-5002124	EmG	19 55 53.210	-50 02 10.82						~	3	0
52	GALEXASC J195608.16-500222.0	EmG	19 56 08.1761439840	-50 02 21.670935864						~	4	0
53	IC 4909	EmG	19 56 45.586	-50 03 20.69		14.62		13.50	13.9	~	23	0
54	ESO 234-28	EmG	20 27 32.1304257768	-51 39 19.919445948		14.31		13.20	13.9	~	25	0
55	2MASS J20274857-5144205	EmG	20 27 48.520	-51 44 19.35						~	4	0
56	GALEXASC J202754.77-513805.9	EmG	20 27 54.640	-51 38 04.52						~	4	0
57	ESO 234-32	Sy2	20 28 06.4780776120	-51 41 29.805268200		14.49		13.34		~	40	0
58	NGC 7582	Sy2	23 18 23.60	-42 22 13.3	11.62	10.92	10.62			~	978	3
59	SINGG HIPASS J2318-42a S4	EmG	23 18 50.440	-42 23 50.30						~	3	0
60	NGC 7590	Sy1	23 18 54.7949760192	-42 14 20.515300476		12.12	13.76	11.06	11.8	~	290	1
61	NGC 7599	EmG	23 19 21.145	-42 15 24.62		11.87	11.41	11.12	11.6	~	134	1
62	NAME Local Group	GrG	~	~						~	9325	0
63	HIPASS J0400-52	EmG	~	~						~	3	0

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