2013ApJ...777....7S

Query : 2013ApJ...777....7S

2013ApJ...777....7S - Astrophys. J., 777, 7 (2013/November-1)

Discovery of a large population of ultraluminous X-ray sources in the bulgeless galaxies NGC 337 and ESO 501-23.

SOMERS G., MATHUR S., MARTINI P., WATSON L., GRIER C.J. and FERRARESE L.

Abstract (from CDS):

We have used Chandra observations of eight bulgeless disk galaxies to identify new ultraluminous X-ray source (ULX) candidates, study their high-mass X-ray binary (HMXB) population, and search for low-luminosity active galactic nuclei (AGNs). We report the discovery of 16 new ULX candidates in our sample of galaxies. Eight of these are found in the star forming galaxy NGC 337, none of which are expected to be background contaminants. The HMXB luminosity function of NGC 337 implies a star formation rate (SFR) of 6.8_–3.5^+4.4 M_☉/yr, consistent at 1.5σ with a recent state of the art SFR determination. We also report the discovery of a bright ULX candidate (X-1) in ESO 501-23. X-1's spectrum is well fit by an absorbed power law with Γ = 1.18_–0.11^+0.19 and N_H= 1.13_–1.13^+7.07/cm2, implying a 0.3-8 keV flux of 1.08_–0.07^+0.05 x 10^–12 erg/s/cm2. Its X-ray luminosity (L_X ) is poorly constrained due to uncertainties in the host galaxy's distance, but we argue that its spectrum implies L_X> 10⁴⁰ erg/s. An optical counterpart to this object may be present in an Hubble Space Telescope image. We also identify ULX candidates in IC 1291, PGC 3853, NGC 5964, and NGC 2805. We find no evidence of nuclear activity in the galaxies in our sample, placing a flux upper limit of 4x10^–15 erg/s/cm2 on putative AGN. Additionally, the Type II-P supernova SN 2011DQ in NGC 337, which exploded two months before our X-ray observation, is undetected.

Abstract Copyright: ∼

Journal keyword(s): galaxies: nuclei - X-rays: binaries - X-rays: galaxies

VizieR on-line data: <Available at CDS (J/ApJ/777/7): table1.dat table3.dat table4.dat table5.dat table6.dat table7.dat>

Nomenclature: Table 7: [SMM2013] IC 1291 X-N, [SMM2013] ESO 501-23 X-NN, [SMM2013] UGC 6446 X-1, [SMM2013] NGC NNNN X-NN, [SMM2013] PGC 3853 X-N N=40.

Simbad objects: 187

Full paper

View the references in ADS

Number of rows : 187

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2024	#notes
1	SDSS J005935.40-073621.5	QSO	00 59 35.3973520704	-07 36 21.435835320		20.8		20.3		~	6	0
2	CXOU J005937.3-073034	X	00 59 37.3	-07 30 34						~	1	0
3	SDSS J005940.46-073348.1	*	00 59 40.46448	-07 33 48.1788		21.8		20.1		~	1	0
4	CXOU J005943.5-073501	X	00 59 43.5	-07 35 01						~	1	0
5	CXOU J005944.6-073058	X	00 59 44.6	-07 30 58						~	1	0
6	CXOU J005947.5-073417	ULX	00 59 47.49864	-07 34 16.0320				18.3		~	1	0
7	SN 2011dq	SN*	00 59 47.75	-07 34 20.5						SNIIP	13	1
8	SDSS J005948.10-073808.1	*	00 59 48.055	-07 38 06.60		15.9		14.4		~	1	0
9	CXOU J005948.5-073457	ULX	00 59 48.5	-07 34 57						~	1	0
10	CXOU J005949.5-073523	ULX	00 59 49.482	-07 35 22.89						~	1	0
11	CXOU J005949.5-073436	ULX	00 59 49.5	-07 34 36						~	1	0
12	NGC 337	EmG	00 59 50.090	-07 34 40.66	11.97	12.06	11.61	12.4	12.2	~	278	1
13	CXOU J005950.4-073454	ULX	00 59 50.4	-07 34 54						~	1	0
14	WISE J005950.64-073457.1	ULX	00 59 50.6	-07 34 58						~	1	0
15	CXOU J005951.5-073134	X	00 59 51.5	-07 31 34						~	1	0
16	SDSS J005951.73-073052.1	*	00 59 51.7308328704	-07 30 52.112899620		19.0		19.2		~	2	0
17	CXOU J005951.9-073458	ULX	00 59 51.9	-07 34 58						~	1	0
18	CXOU J005952.3-073447	ULX	00 59 52.3	-07 34 47						~	1	0
19	CXOU J005953.3-073457	ULX	00 59 53.3	-07 34 57						~	1	0
20	USNO-B1.0 0824-00013656	ULX	00 59 53.323	-07 35 22.20		17.8		18.7		~	1	0
21	CXOU J005954.6-073656	MIR	00 59 54.589	-07 36 56.25						~	1	0
22	SDSS J005956.43-073832.3	*	00 59 56.43096	-07 38 32.3520				20.3		~	1	0
23	CXOU J010007.3-073522	X	01 00 07.3	-07 35 22						~	1	0
24	SDSS J010442.22-060710.7	*	01 04 42.2213867304	-06 07 10.798532760		18.8		18.7		~	1	0
25	CXOU J010443.6-060808	X	01 04 43.6	-06 08 08						~	1	0
26	SDSS J010454.29-060621.0	X	01 04 54.295	-06 06 21.03						~	1	0
27	CXOU J010500.2-061540	X	01 05 00.2	-06 15 40						~	1	0
28	CXOU J010502.6-061509	X	01 05 02.6	-06 15 09						~	1	0
29	CXOU J010502.8-061536	X	01 05 02.8	-06 15 36						~	1	0
30	CXOU J010504.5-061323	ULX	01 05 04.5	-06 13 23						~	1	0
31	MCG-01-03-085	LSB	01 05 04.8748186464	-06 12 44.774236980		12.1		12.1	12.0	~	92	0
32	CXOU J010505.3-061148	ULX	01 05 05.3	-06 11 48						~	1	0
33	XMS J010506.6-061510	AGN	01 05 06.5	-06 15 09						~	3	0
34	CXOU J010509.0-060650	X	01 05 09.0	-06 06 50						~	1	0
35	CXOU J010511.3-061207	ULX	01 05 11.3	-06 12 07						~	1	0
36	CXOU J010513.1-062151	MIR	01 05 13.116	-06 21 51.99						~	1	0
37	CXOU J010513.9-061750	X	01 05 13.9	-06 17 50						~	1	0
38	SDSS J010513.94-061028.6	X	01 05 13.946	-06 10 28.69						~	1	0
39	CXOU J010515.5-061639	MIR	01 05 15.538	-06 16 39.95						~	1	0
40	CXOU J010516.1-061749	MIR	01 05 16.087	-06 17 48.12						~	1	0
41	CXOU J010517.0-061825	X	01 05 17.0	-06 18 25						~	1	0
42	SDSS J010522.28-061151.4	QSO	01 05 22.288	-06 11 51.46						~	5	0
43	CXOU J010522.4-061252	X	01 05 22.4	-06 12 52						~	1	0
44	CXOU J010523.5-062029	X	01 05 23.5	-06 20 29						~	1	0
45	SDSS J010523.59-061249.6	X	01 05 23.592	-06 12 49.69						~	1	0
46	CXOU J010529.6-061734	MIR	01 05 29.708	-06 17 33.43						~	1	0
47	[FWB2009] HLX-1	ULX	01 10 28.30	-46 04 22.3			24.5	23.80		~	202	1
48	NGC 1365	Sy1	03 33 36.458	-36 08 26.37	10.48	10.08	9.63	8.79	9.7	~	1802	2
49	[SK2009] X2	ULX	03 33 41.85	-36 07 31.4						~	9	0
50	2MASS J07371703+6535579	HXB	07 37 17.0432126424	+65 35 57.826001220						SNIIP	279	1
51	CXOU J091944.8+635739	X	09 19 44.8	+63 57 39						~	1	0
52	SDSS J091947.13+635716.3	*	09 19 47.1347596992	+63 57 16.008988608		20.5		19.7		~	1	0
53	CXOU J091947.6+640743	X	09 19 47.6	+64 07 43						~	1	0
54	SDSS J091953.27+640336.4	X	09 19 53.276	+64 03 36.41						~	1	0
55	CXOU J091955.4+635934	MIR	09 19 55.382	+63 59 34.17						~	1	0
56	CXOU J091957.5+640206	X	09 19 57.5	+64 02 06						~	1	0
57	NVSS J092004+635518	Rad	09 20 04.9475086992	+63 55 26.026656168		19.6		19.0		~	2	0
58	CXOU J092006.3+640738	ULX	09 20 06.3	+64 07 38						~	1	0
59	[SMM2013] NGC 2805 X-14	ULX	09 20 11.2042832856	+64 07 23.789767116		20.2		17.6		~	1	0
60	USNO-B1.0 1540-00162375	ULX	09 20 13.09	+64 04 39.3		15.2				~	1	0
61	SDSS J092013.63+640605.4	ULX	09 20 13.6745092701	+64 06 05.200941725		15.9				~	1	0
62	CXOU J092014.9+640436	ULX	09 20 14.9	+64 04 36						~	1	0
63	CXOU J092018.6+640615	ULX	09 20 18.894	+64 06 14.92						~	1	0
64	CXOU J092019.5+640624	ULX	09 20 19.521	+64 06 22.29						~	1	0
65	USNO-B1.0 1540-00162426	ULX	09 20 19.69	+64 04 54.9		19.8		17.4		~	1	0
66	CXOU J092020.2+640409	ULX	09 20 20.2	+64 04 09						~	1	0
67	NGC 2805	GiP	09 20 20.3891233968	+64 06 10.716485004		11.9				~	214	1
68	CXOU J092020.6+640607	ULX	09 20 20.6	+64 06 07						~	1	0
69	CXOU J092021.0+640617	ULX	09 20 21.0	+64 06 17						~	1	0
70	CXOU J092032.1+640424	ULX	09 20 32.284	+64 04 22.08						~	1	0
71	CXOU J092033.2+640345	ULX	09 20 33.2	+64 03 45						~	1	0
72	USNO-B1.0 1541-00162121	ULX	09 20 34.45	+64 06 41.6		18.6				~	1	0
73	CXOU J092037.0+641349	MIR	09 20 36.885	+64 13 48.56						~	1	0
74	SDSS J092037.69+635827.5	*	09 20 37.70064	+63 58 27.2172		21.4		19.6		~	1	0
75	CXOU J092038.2+641429	X	09 20 38.2	+64 14 29						~	1	0
76	SDSS J092043.52+640050.5	*	09 20 43.53528	+64 00 50.2704		21.4		19.5		~	1	0
77	CXOU J092044.7+641042	X	09 20 44.7	+64 10 42						~	1	0
78	CXOU J103503.4-244814	X	10 35 03.4	-24 48 14						~	1	0
79	CXOU J103507.0-244149	X	10 35 07.0	-24 41 49						~	1	0
80	CXOU J103509.4-245248	X	10 35 09.4	-24 52 48						~	1	0
81	CXOU J103510.4-243846	X	10 35 10.4	-24 38 46						~	1	0
82	CXOU J103511.5-245055	X	10 35 11.5	-24 50 55						~	1	0
83	CXOU J103514.5-243939	X	10 35 14.5	-24 39 39						~	1	0
84	CXOU J103514.8-244455	X	10 35 14.8	-24 44 55						~	1	0
85	CXOU J103520.7-243708	X	10 35 20.7	-24 37 08						~	1	0
86	CXOU J103522.2-244513	ULX	10 35 22.2	-24 45 13						~	1	0
87	CXOU J103522.6-244503	ULX	10 35 22.6	-24 45 03						~	1	0
88	CXOU J103522.8-244632	ULX	10 35 22.7862645384	-24 46 31.632536532		16.2		14.3		~	1	0
89	ESO 501-23	EmG	10 35 23.20	-24 45 14.9		13.15	12.74	13.0	13.1	~	41	0
90	USNO-B1.0 0652-00247945	ULX	10 35 23.305	-24 45 17.45		11.9		17.0		~	1	0
91	CXOU J103526.9-244745	X	10 35 26.9	-24 47 45						~	1	0
92	CXOU J103528.1-245347	X	10 35 28.1	-24 53 47						~	1	0
93	CXOU J103528.3-244824	X	10 35 28.3	-24 48 24						~	1	0
94	CXOU J103529.5-244835	X	10 35 29.5	-24 48 35						~	1	0
95	CXOU J103534.2-244448	X	10 35 34.2	-24 44 48						~	1	0
96	CXOU J103535.3-244318	X	10 35 35.2750065696	-24 43 18.289890444		20.1		18.9		~	2	0
97	SDSS J112606.34+534859.1	QSO	11 26 06.349	+53 48 59.18		21.1				~	7	0
98	CXOU J112620.9+534447	X	11 26 20.9	+53 44 47						~	1	0
99	SDSS J112622.34+534722.8	X	11 26 22.341	+53 47 22.80						~	1	0
100	SDSS J112623.53+534856.3	X	11 26 23.539	+53 48 56.33						~	1	0
101	SDSS J112626.22+534954.9	QSO	11 26 26.2256900688	+53 49 55.007775192		20.9				~	8	0
102	CXOU J112626.7+534437	X	11 26 26.7	+53 44 37						~	1	0
103	CXOU J112629.1+535007	MIR	11 26 29.230	+53 50 07.04						~	1	0
104	SDSS J112631.99+535023.0	QSO	11 26 32.0042890512	+53 50 22.790557068		20.0		20.1		~	6	0
105	CXOU J112635.7+534456	ULX	11 26 35.7	+53 44 56						~	1	0
106	UGC 6446	GiC	11 26 40.4656762968	+53 44 48.012539280		14.5				~	156	0
107	BD+54 1442	PM*	11 26 41.9140501320	+53 42 57.961229904				9.8		~	16	0
108	SDSS J112645.63+533911.3	QSO	11 26 45.6297049464	+53 39 11.034178992		19.9		20.4		~	7	0
109	SDSS J112646.20+534921.7	QSO	11 26 46.19400	+53 49 21.4068		21.5		20.4		~	7	0
110	CXOU J112654.6+534002	X	11 26 54.6	+53 40 02						~	1	0
111	SDSS J112656.08+533932.3	*	11 26 56.07384	+53 39 32.0040		20.8		20.1		~	1	0
112	SDSS J112659.25+534517.1	QSO	11 26 59.244	+53 45 16.85						~	7	0
113	CXOU J112717.0+534112	X	11 27 17.0	+53 41 12						~	1	0
114	CXOU J114033.8+561520	X	11 40 33.8	+56 15 20						~	1	0
115	SDSS J114035.56+560914.6	QSO	11 40 35.58024	+56 09 14.4324		21.6				~	8	0
116	CXOU J114038.0+561023	X	11 40 38.0	+56 10 23						~	1	0
117	CXOU J114047.6+561059	MIR	11 40 47.683	+56 10 58.85						~	1	0
118	CXOU J114048.5+561847	X	11 40 48.5	+56 18 47						~	1	0
119	CXOU J114049.3+560101	MIR	11 40 49.1489464032	+56 01 01.471061424						~	1	0
120	CXOU J114050.2+561708	X	11 40 50.2	+56 17 08						~	1	0
121	CXOU J114053.4+560809	X	11 40 53.4	+56 08 09						~	1	0
122	CXOU J114053.5+561011	X	11 40 53.5	+56 10 11						~	1	0
123	NGC 3804	LSB	11 40 54.2302328040	+56 12 07.479490968		13.8				~	102	1
124	CXOU J114054.5+561557	X	11 40 54.5	+56 15 57						~	1	0
125	SDSS J114104.42+561237.5	X	11 41 04.429	+56 12 37.56						~	1	0
126	SDSS J114109.64+560818.9	*	11 41 09.6628294032	+56 08 18.786256224		19.6		18.3		~	1	0
127	CXOU J114109.6+561522	MIR	11 41 09.700	+56 15 23.14						~	1	0
128	SDSS J114112.36+561441.2	QSO	11 41 12.382	+56 14 41.01						~	6	0
129	CXOU J114114.8+561409	X	11 41 14.8	+56 14 09						~	1	0
130	CXOU J114115.4+560841	X	11 41 15.4	+56 08 41						~	1	0
131	CXOU J114118.4+560248	X	11 41 18.4	+56 02 48						~	1	0
132	CXOU J114119.0+560932	X	11 41 19.0	+56 09 32						~	1	0
133	CXOU J114119.6+561258	X	11 41 19.6	+56 12 58						~	1	0
134	SDSS J114124.27+560448.9	QSO	11 41 24.3096806160	+56 04 48.823807980		20.5		20.7		~	7	0
135	StKM 1-963	PM*	11 41 29.7224764728	+56 07 31.817658360		12.60	11.53	10.9		K5	6	0
136	SDSS J153708.14+060549.3	*	15 37 08.1484006860	+06 05 49.263954125		20.6		20.0		~	1	0
137	CXOU J153712.5+060053	MIR	15 37 12.437	+06 00 53.85						~	1	0
138	CXOU J153714.8+055921	X	15 37 14.8	+05 59 21						~	1	0
139	SDSS J153715.37+055906.9	*	15 37 15.3787327512	+05 59 06.994131360		20.6		20.1		~	1	0
140	CXOU J153724.7+060103	X	15 37 24.7	+06 01 03						~	1	0
141	CXOU J153725.3+060329	MIR	15 37 25.349	+06 03 29.70						~	1	0
142	CXOU J153727.6+060025	X	15 37 27.6	+06 00 25						~	1	0
143	CXOU J153730.8+055852	ULX	15 37 30.8	+05 58 52						~	1	0
144	CXOU J153731.6+060316	X	15 37 31.6	+06 03 16						~	1	0
145	CXOU J153733.0+060350	X	15 37 33.0	+06 03 50						~	1	0
146	CXOU J153733.1+055756	ULX	15 37 33.1	+05 57 56						~	1	0
147	USNO-B1.0 0959-00250298	ULX	15 37 33.45	+05 59 16.0		19.0		19.1		~	1	0
148	CXOU J153734.2+060131	X	15 37 34.2	+06 01 31						~	1	0
149	CXOU J153736.0+055545	X	15 37 36.0	+05 55 45						~	1	0
150	NGC 5964	EmG	15 37 36.2103407496	+05 58 26.360661972		12.45	11.82	11.48	10.89	~	126	0
151	SDSS J153737.26+055538.7	X	15 37 37.265	+05 55 38.79						~	1	0
152	CXOU J153738.9+055845	ULX	15 37 38.9	+05 58 45						~	1	0
153	SDSS J153740.62+060315.9	*	15 37 40.62504	+06 03 15.9912		21.6				~	1	0
154	CXOU J153743.7+060104	X	15 37 43.7	+06 01 04						~	1	0
155	CXOU J153743.9+055632	X	15 37 43.9	+05 56 32						~	1	0
156	SDSS J153749.45+055832.7	X	15 37 49.455	+05 58 32.72						~	1	0
157	CXOU J153750.5+055811	X	15 37 50.5	+05 58 11						~	1	0
158	CXOU J153751.6+060003	X	15 37 51.6	+06 00 03						~	1	0
159	SDSS J153752.79+055902.5	X	15 37 52.792	+05 59 02.57						~	1	0
160	SDSS J153758.31+054724.7	PM*	15 37 58.309	+05 47 24.96		17.3		15.2		~	1	0
161	CXOU J183327.0+491736	X	18 33 27.0	+49 17 36						~	1	0
162	CXOU J183327.7+491816	X	18 33 27.7	+49 18 16						~	1	0
163	CXOU J183330.8+491216	X	18 33 30.91	+49 12 15.3		21.6		20.0		~	1	0
164	TYC 3534-2788-1	*	18 33 31.7820616152	+49 14 16.969646652		10.4	9.91	9.4		~	1	0
165	WISE J183333.40+491617.2	X	18 33 33.4004003040	+49 16 17.202377316		20.9		20.2		~	1	0
166	CXOU J183336.4+490950	X	18 33 36.4	+49 09 50						~	1	0
167	CXOU J183340.9+492251	X	18 33 40.9	+49 22 51						~	1	0
168	CXOU J183344.1+492109	X	18 33 44.1	+49 21 09						~	1	0
169	WISE J183346.08+491711.1	*	18 33 46.0788418632	+49 17 11.486780052		13.7		12.7		~	1	0
170	CXOU J183346.6+492136	X	18 33 46.6	+49 21 36						~	1	0
171	CXOU J183347.0+491423	X	18 33 47.0	+49 14 23						~	1	0
172	CXOU J183347.6+491946	X	18 33 47.6	+49 19 46						~	1	0
173	CXOU J183350.6+491558	ULX	18 33 50.6	+49 15 58						~	1	0
174	CXOU J183351.4+491332	X	18 33 51.4	+49 13 32						~	1	0
175	CXOU J183351.5+491642	ULX	18 33 51.5	+49 16 42						~	1	0
176	IC 1291	LSB	18 33 52.573	+49 16 42.86		14.2				~	49	1
177	CXOU J183353.7+491904	X	18 33 53.7	+49 19 04						~	1	0
178	CXOU J183355.3+491527	X	18 33 55.3	+49 15 27						~	1	0
179	USNO-B1.0 1392-00289633	ULX	18 33 55.46	+49 17 41.2		16.4		17.9		~	1	0
180	USNO-B1.0 1392-00289637	ULX	18 33 55.789	+49 17 46.10		16.8		18.7		~	1	0
181	CXOU J183356.5+492343	X	18 33 56.5	+49 23 43						~	1	0
182	CXOU J183400.8+492028	X	18 34 00.8	+49 20 28						~	1	0
183	CXOU J183402.2+491817	X	18 34 02.1653619408	+49 18 16.894528740		21.0		20.2		~	1	0
184	CXOU J183410.5+490933	X	18 34 10.5	+49 09 33						~	1	0
185	CXOU J183412.1+492155	X	18 34 12.1	+49 21 55						~	1	0
186	CXOU J183415.8+491242	X	18 34 15.72	+49 12 42.4		21.1		19.7		~	1	0
187	CXOU J183416.4+491544	X	18 34 16.4	+49 15 44						~	1	0

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