2014ApJ...790..132D

Query : 2014ApJ...790..132D

2014ApJ...790..132D - Astrophys. J., 790, 132 (2014/August-1)

Some like it hot: linking diffuse X-ray luminosity, baryonic mass, and star formation rate in compact groups of galaxies.

DESJARDINS T.D., GALLAGHER S.C., HORNSCHEMEIER A.E., MULCHAEY J.S., WALKER L.M., BRANDT W.N., CHARLTON J.C., JOHNSON K.E. and TZANAVARIS P.

Abstract (from CDS):

We present an analysis of the diffuse X-ray emission in 19 compact groups (CGs) of galaxies observed with Chandra. The hottest, most X-ray luminous CGs agree well with the galaxy cluster X-ray scaling relations in L_X-T and L_X-σ, even in CGs where the hot gas is associated with only the brightest galaxy. Using Spitzer photometry, we compute stellar masses and classify Hickson CGs 19, 22, 40, and 42, and RSCGs 32, 44, and 86 as fossil groups using a new definition for fossil systems that includes a broader range of masses. We find that CGs with total stellar and H I masses ≳ 10^11.3 M_☉ are often X-ray luminous, while lower-mass CGs only sometimes exhibit faint, localized X-ray emission. Additionally, we compare the diffuse X-ray luminosity against both the total UV and 24 µm star formation rates of each CG and optical colors of the most massive galaxy in each of the CGs. The most X-ray luminous CGs have the lowest star formation rates, likely because there is no cold gas available for star formation, either because the majority of the baryons in these CGs are in stars or the X-ray halo, or due to gas stripping from the galaxies in CGs with hot halos. Finally, the optical colors that trace recent star formation histories of the most massive group galaxies do not correlate with the X-ray luminosities of the CGs, indicating that perhaps the current state of the X-ray halos is independent of the recent history of stellar mass assembly in the most massive galaxies.

Abstract Copyright: ∼

Journal keyword(s): galaxies: groups: general - X-rays: galaxies

Simbad objects: 34

Full paper

View the references in ADS

Number of rows : 34

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	HCG 100	CGG	00 01 19.783	+13 07 21.81						~	58	0
2	Mrk 935	G	00 01 45.250	+13 06 02.00		15.5				~	18	0
3	HCG 7	CGG	00 39 15.9	+00 53 17		11.4				~	87	0
4	RSCG 4	CGG	00 42 49.5	-23 33 11						~	5	0
5	RSCG 15	CGG	01 52 41.4	+36 08 46						~	7	0
6	RSCG 17	CGG	01 56 21.9	+05 38 36						~	6	0
7	HCG 16	CGG	02 09 40.82	-10 11 02.0						~	167	0
8	HCG 22	CGG	03 03 31	-15 40.5						~	69	0
9	HCG 30	CGG	04 36.5	-02 49						~	43	0
10	HCG 31	CGG	05 01 37	-04 15.4						~	128	0
11	HCG 37	CGG	09 13 35.6	+30 00 51						~	63	0
12	SN 2006jc	SN*	09 17 20.78	+41 54 32.7			13.8			SNIbn	327	1
13	RSCG 31	CGG	09 17 25	+41 58.1						~	6	0
14	MLCG 1482	CGG	09 19 44.582	+33 44 39.51						~	7	0
15	ACO 779	ClG	09 19 48.0	+33 45 32						~	247	0
16	MCG-01-25-008	GiG	09 38 53.471	-04 50 55.32		14.09		12.18		~	60	0
17	APG 321	IG	09 38 54	-04 51.1		15				~	82	0
18	M 82	IG	09 55 52.430	+69 40 46.93	9.61	9.30	8.41			~	5721	6
19	HCG 42	CGG	10 00 13.1	-19 38 24						~	98	0
20	NGC 3091	BiC	10 00 14.125	-19 38 11.32		12.04	10.61	10.56	9.25	~	178	0
21	NGC 3096	GiG	10 00 33.1214332440	-19 39 42.939578196		14.08	13.09	13.03	11.75	~	45	0
22	HCG 51	CGG	11 22 21.6	+24 19 41		14.9				~	82	0
23	HCG 54	CGG	11 29 15	+20 34.7						~	51	0
24	HCG 59	CGG	11 48 27	+12 43.0						~	53	0
25	NAME North Polar Spur	ISM	12 00	+00.0						~	351	1
26	HCG 62	CGG	12 53 05.6	-09 12 21						~	304	0
27	ACO 1656	ClG	12 59 48.7	+27 58 50						~	4650	2
28	NGC 5353	GiP	13 53 26.7104646984	+40 16 59.200050612		11.8		10.57		~	274	1
29	HCG 68	CGG	13 53 40.9	+40 19 07			12.4			~	112	0
30	HCG 79	CGG	15 59 11.605	+20 45 24.66						~	113	0
31	HCG 90	CGG	22 02 06.3	-31 55 48						~	128	0
32	NAME Stephan's Quintet	CGG	22 35 57.5	+33 57 36						~	415	1
33	HCG 97	CGG	23 47 24.0	-02 19 08						~	97	0
34	HCG 31r	G	~	~						~	3	0

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