2001ApJS..134...77S

Query : 2001ApJS..134...77S

2001ApJS..134...77S - Astrophys. J., Suppl. Ser., 134, 77-102 (2001/May-0)

Faint X-ray sources resolved in the ASCA galactic plane survey and their contribution to the galactic ridge X-ray emission.

SUGIZAKI M., MITSUDA K., KANEDA H., MATSUZAKI K., YAMAUCHI S. and KOYAMA K.

Abstract (from CDS):

The X-ray emission from the central region of the Galactic plane, |l|≲45° and |b|≲0°.4, was studied in the 0.7-10 keV energy band with a spatial resolution of ∼3' with the Advanced Satellite for Cosmology and Astrophysics (ASCA) observatory. We developed a new analysis method for the ASCA data to resolve discrete sources from the extended Galactic ridge X-ray emission (GRXE). We successfully resolved 163 discrete sources with an X-ray flux down to 10–12.5 ergs.cm–2.s–1 and determined the intensity variations of the GRXE as a function of the Galactic longitude with a spatial resolution of about 1°. The longitudinal intensity variation in the energy band above 4 keV, for which there is little absorption in the Galactic plane, shows a large enhanced feature within |l|≲30°. This suggests a strong enhancement of X-ray emissivity of the GRXE inside the 4 kpc arm of the Galaxy. Searches for identifications of the resolved X-ray sources with cataloged X-ray sources and optical stars show that the 66% are unidentified. Spectral analysis of each source shows that a large number of the unidentified sources have hard X-ray spectra obscured by the Galactic interstellar medium. We classified the sources into several groups by the flux, the hardness and the softness of the spectra, and performed further detailed analysis for the spectra summed within each group. Possible candidates of X-ray origins of these unidentified sources are discussed based on the grouping spectral analysis. Also, we derived the logN-logS relations of the resolved sources in the energy bands below and above 2 keV separately. The logN-logS relation of the Galactic X-ray sources above 2 keV was obtained for the first time with this study. It is represented by a power-law with an index of -0.79±0.07 after correction for the contribution of extragalactic X-ray sources. This flat power-law relation suggests that the spatial distribution of the X-ray sources should have an armlike structure in which the solar system is included. The integrated surface brightness of the resolved sources is about 10% of the total GRXE in both energy bands. The approximately 90% of the emission remaining is still unresolved.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: General - X-Rays: General

VizieR on-line data: <Available at CDS (J/ApJS/134/77): table2.dat table5.dat>

Simbad objects: 166

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Number of rows : 166
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 AX J1431.8-6021 X 14 31 49 -60 21.2           ~ 1 0
2 V* V841 Cen RS* 14 34 16.0459114320 -60 24 28.981545336   9.63 8.57   7.498 K1IIIe 90 0
3 HD 128696 EB* 14 40 38.4650661120 -60 01 36.861554064   10.63 9.84     K0V 10 1
4 AX J1445.3-5949 X 14 45 20.6 -59 49 32           ~ 2 0
5 AX J1445.7-5931 * 14 45 43.7017934712 -59 32 05.119745172           OIf* 2 0
6 WR 62-1 WR* 14 46 53.5727857008 -59 19 38.298633816           WN7-8h 4 0
7 CD-58 5836 * 14 55 39.6075153504 -59 13 07.709411712   11.47 10.61     G9V(e) 8 0
8 AX J1457.5-5901 X 14 57 33 -59 01.3           ~ 2 0
9 AX J1504.6-5824 X 15 04 36 -58 24.7           ~ 4 0
10 AX J1510.0-5824 X 15 10 06 -58 24.9           ~ 3 0
11 AX J1537.8-5556 X 15 37 52 -55 56.3           ~ 2 0
12 AX J1538.3-5541 LXB 15 38 18.24 -55 56 16.8           ~ 11 0
13 AX J1539.7-5532 X 15 39 48 -55 32.0           ~ 1 0
14 AX J1541.3-5522 X 15 41 22 -55 22.0     14.20     ~ 2 0
15 AX J1542.5-5519 X 15 42 34 -55 19.3           ~ 1 0
16 AX J1545.9-5443 X 15 45 58 -54 43.1           ~ 2 0
17 AX J1549.0-5420 X 15 49 05 -54 20.5           ~ 2 0
18 AX J1549.8-5416 V* 15 49 51.6875106240 -54 16 29.518974192           ~ 9 0
19 AX J1550.5-5408 X 15 50 36 -54 08.7           ~ 2 0
20 PSR J1550-5418 Psr 15 50 54.18 -54 18 23.9           ~ 409 1
21 AX J1553.5-5347 X 15 53 32 -53 47.6           ~ 2 0
22 ASAS J155644-5324.6 Ro* 15 56 43.7308869984 -53 24 41.681071044   14.02 12.166   11.020 K0IIIe 9 0
23 CPD-53 6881 * 15 58 36.2383250712 -53 34 12.488137032   11.57 11.27     A1 4 0
24 HD 146628 * 16 19 29.5214538960 -49 45 40.715149896 10.23 10.58 10.06 10.02   B1/2Ia 69 1
25 IGR J16195-4945 HXB 16 19 32.1832111152 -49 44 30.565493340   17.4 16.8 15.3 15.295 ON9.7Iab 53 0
26 V* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1643 0
27 AX J1620.1-5002 X 16 20 12 -50 02.2     12.38     ~ 9 0
28 EM* VRMF 1 Em* 16 20 46.6 -49 42 19     15.58     ~ 2 0
29 AX J1621.4-4933 X 16 21 25 -49 33.7           ~ 1 0
30 CD-49 10572 * 16 21 45.9352839312 -49 35 02.018903496 12.92 12.83 12.08 12.16   OB 7 0
31 HD 147070 * 16 21 57.4879849848 -49 39 44.806652028   9.84 9.280     K3(III) 20 0
32 AX J1622.1-5005 X 16 22 08 -50 05.7     12.20     ~ 3 0
33 AX J1622.7-4946 X 16 22 47 -49 46.9           ~ 1 0
34 IGR J16320-4751 HXB 16 32 01.76 -47 52 29.0           BN0.5Ia 174 0
35 2E 3714 WR* 16 32 48.511 -47 45 06.27           Ofpe/WN9 6 0
36 HD 148937 SB* 16 33 52.3869185520 -48 06 40.476418740 6.49 7.12 6.71 7.61   O6f?p 391 1
37 AX J1635.4-4728 X 16 35 25 -47 28.4           ~ 1 0
38 SNR G337.2+00.1 Rad 16 35 56.0 -47 19 54           ~ 25 1
39 AX J1637.8-4656 X 16 37 51 -46 56.6           ~ 2 0
40 NAME AX J163904-4642 HXB 16 39 06 -46 42.2           BIV-V 97 1
41 AX J1640.7-4632 BL? 16 40 43.2 -46 31 48           ~ 158 2
42 AX J1651.0-4403 X 16 51 06 -44 03.5           ~ 2 0
43 AX J1652.2-4414 X 16 52 18 -44 14.1           ~ 1 0
44 AX J1654.3-4337 CV? 16 54 23.4059768318 -43 37 43.799676560           ~ 6 0
45 HD 152335 ** 16 54 41.74881 -43 33 36.0170           F7V 27 0
46 AX J1656.7-4239 X 16 56 50.1 -42 39 06           ~ 2 0
47 AX J1657.1-4255 X 16 57 07 -42 55.3           ~ 1 0
48 AX J1657.3-4321 X 16 57 24 -43 21.5           ~ 2 0
49 AX J1659.0-4208 X 16 59 02 -42 08.1           ~ 3 0
50 AX J1659.0-4242 X 16 59 05 -42 42.3     11.68     ~ 2 0
51 AX J1659.3-4234 X 16 59 23 -42 34.9           ~ 1 0
52 AX J1659.8-4209 X 16 59 52 -42 09.1           ~ 2 0
53 2XMMi J170004.2-415804 HXB 17 00 04.26 -41 58 04.7           Be? 23 0
54 HD 153295 HXB 17 00 25.2435659064 -42 19 00.279910236 9.05     9.52   B2e 78 0
55 NAME OAO 1657-41 HXB 17 00 48.884 -41 39 21.46           Ofpe/WN9 246 0
56 2E 1657.3-4204 X 17 00 54.3 -42 09 19           ~ 1 0
57 AX J1701.2-4212 X 17 01 13 -42 12.2           ~ 1 0
58 SNR G344.7-00.1 SNR 17 03 49 -41 42.5           ~ 86 0
59 AX J1704.7-4109 X 17 04 45 -41 09.6           ~ 2 0
60 AX J1705.1-4113 X 17 05 06 -41 14.0           ~ 1 0
61 AX J1705.6-4038 X 17 05 41.1 -40 38 50           ~ 2 0
62 AX J1705.9-4104 X 17 05 56 -41 05.0           ~ 1 0
63 AX J1717.2-3718 X 17 17 15 -37 18.7     13.00     ~ 3 0
64 SNR G349.7-00.2 X 17 18 05 -37 26.9           ~ 5 0
65 AX J1719.1-3652 Ro* 17 19 13.1036042592 -36 51 24.319244952   14.69 13.31 12.88 11.183 ~ 5 0
66 AX J1719.3-3703 X 17 19 23 -37 03.0           ~ 3 0
67 AX J1720.8-3710 X 17 20 51 -37 10.4     11.68     ~ 4 0
68 SNR G350.1-00.3 SNR 17 21 06 -37 26.9     13.60     ~ 78 0
69 AX J1725.8-3533 X 17 25 51 -35 33.7           ~ 2 0
70 HD 319810 * 17 26 19.6236675936 -35 17 14.617641408   11.18 10.63     G0 4 0
71 AX J1726.7-3540 X 17 26 41.9 -35 40 30           ~ 3 0
72 AX J1726.7-3504 X 17 26 42 -35 04.0           ~ 1 0
73 SNR G352.7-00.1 Rad 17 27 43 -35 06.5           ~ 72 1
74 HD 159176 Be* 17 34 42.4921337376 -32 34 53.995451196 4.88 5.74 5.70 7.19   O7V 254 0
75 SNR G355.6+00.0 SNR 17 35 18 -32 37.0           ~ 27 0
76 AX J1735.8-3207 X 17 35 48 -32 07.2           ~ 3 0
77 AX J1736.4-3141 * 17 36 28 -31 41.2     12.80     G0III 3 0
78 AX J1753.5-2538 X 17 53 31 -25 38.6           ~ 2 0
79 AX J1754.0-2553 X 17 54 04 -25 53.2           ~ 2 0
80 HD 164492 Y*O 18 02 23.5527520992 -23 01 50.999556180 6.49 7.49 6.80 7.52   O7.5Vz 229 0
81 AX J1808.0-1956 X 18 08 01 -19 56.0           ~ 1 0
82 AX J1808.2-2021 X 18 08 17 -20 21.7           ~ 1 0
83 AX J1808.6-2024 ISM 18 08 39 -20 24.6           ~ 130 3
84 AX J1808.9-2004 X 18 08 57 -20 04.6           ~ 1 0
85 SNR G010.5-00.0 Rad 18 09.1 -19 47           ~ 18 1
86 HD 166077 * 18 09 43.7551521168 -19 18 51.642648360   10.24 10.15     A2/3II/III 7 0
87 AX J1809.8-1943 Psr 18 09 51.07 -19 43 51.8           ~ 463 0
88 AX J1810.5-1917 X 18 10 33 -19 17.6           ~ 2 0
89 AX J1811.2-1828 X 18 11 17 -18 28.3           ~ 3 0
90 HD 166441 * 18 11 23.8347182376 -19 12 28.952904132   11.25 9.72     G6/K1 5 0
91 AX J1812.1-1835 X 18 12 12 -18 35.4           ~ 3 0
92 SNR G011.8-00.2 SNR 18 12.4 -18 44           ~ 22 0
93 AX J1817.0-1607 X 18 17 05 -16 07.9           ~ 1 0
94 AX J1818.8-1527 X 18 18 49 -15 27.8     11.29     ~ 2 0
95 AX J1818.8-1559 X 18 18 53 -15 59.5           ~ 15 0
96 V* V1962 Sgr Or* 18 19 17.5128058872 -16 01 12.993415428           ~ 4 0
97 AX J1819.2-1548 X 18 19 18 -15 48.2           ~ 1 0
98 SNR G016.7-00.1 X 18 21 04 -14 20.6           ~ 1 0
99 AX J1822.2-1425 X 18 22 16 -14 25.4           ~ 1 0
100 SNR G018.1-00.2 Rad 18 24 37.0 -13 15 18           ~ 43 1
101 AX J1824.7-1253 X 18 24 43 -12 53.2           ~ 1 0
102 AX J1825.1-1253 X 18 25 10 -12 53.3     12.23     ~ 3 0
103 AX J1825.5-1144 X 18 25 30 -11 44.9           ~ 2 0
104 AX J1825.6-1214 X 18 25 39 -12 14.8           ~ 1 0
105 AX J1826.8-1206 X 18 26 51 -12 06.4           ~ 1 0
106 AX J1828.7-1116 X 18 28 47 -11 16.9     13.40     ~ 4 0
107 AX J1830.6-1002 AGN 18 30 38 -10 02.8           ~ 13 0
108 Suzaku J1831-0943 X 18 31 15 -09 44.0           ~ 2 0
109 AX J1831.2-1008 X 18 31 16 -10 08.6           ~ 4 0
110 AX J1832.1-0940 X 18 32 06 -09 40.7           ~ 1 0
111 IRAS 18293-0941 HX? 18 32 08.9370854568 -09 39 05.940276624         12.32 Be? 8 0
112 AX J1832.3-0840 CV* 18 32 19.3114984032 -08 40 30.244090656           ~ 24 0
113 AX J1832.5-0916 X 18 32 31 -09 16.2           ~ 2 0
114 AX J1833.7-0828 X 18 33 46 -08 28.1     13.76     ~ 3 0
115 3XMM J183359.4-082226 X 18 33 59.696 -08 22 25.60           ~ 5 0
116 AX J1834.6-0801 X 18 34 41 -08 02.0           ~ 2 0
117 2E 1832.4-0812 X 18 35 08.9 -08 09 40           ~ 2 0
118 AX J1835.3-0754 X 18 35 18 -07 54.7           ~ 1 0
119 X Sct X-1 HXB 18 35 25.8244223112 -07 36 50.416365528           ~ 80 0
120 AX J1836.1-0756 X 18 36 08 -07 56.6           ~ 1 0
121 2E 1833.6-0649 X 18 36 21.1 -06 46 47           ~ 4 0
122 AX J1838.0-0655 BL? 18 38 03.13 -06 55 33.4           ~ 77 2
123 AX J1839.5-0544 X 18 39 31 -05 44.6           ~ 2 0
124 AX J1839.9-0546 X 18 39 58 -05 46.9           ~ 1 0
125 AX J1840.0-0552 X 18 40 05 -05 52.2     13.50     ~ 2 0
126 GSC 05125-01818 * 18 40 10.3639327584 -05 44 20.598761868   12.19 11.78     B5 2 0
127 AX J1840.4-0544 X 18 40 24 -05 44.8           ~ 1 0
128 4C -04.71 Rad 18 41 19.8 -04 56 06           ~ 326 3
129 AX J1843.9-0351 X 18 43 56 -03 51.6           ~ 1 0
130 AX J1844.0-0355 X 18 44 01 -03 55.6     13.20     ~ 2 0
131 AX J1844.7-0305 X 18 44 38 -03 08.6           ~ 3 0
132 AX J1846.0-0231 X 18 46 00 -02 31.6           ~ 3 0
133 AX J1846.1-0239 X 18 46 11 -02 39.5           ~ 3 0
134 AX J1846.4-0258 Psr 18 46 24.5 -02 58 28           ~ 26 0
135 2E 4131 X 18 46 47.274 -02 41 02.42           ~ 2 0
136 2MASS J18473666-0156334 ** 18 47 36.670 -01 56 33.46           WN7 28 0
137 AX J1847.6-0219 X 18 47 41 -02 19.0           ~ 3 0
138 AX J1848.8-0129 X 18 48 48 -01 29.2           ~ 17 0
139 AX J1849.5-0055 X 18 49 31.2 -00 56 25           ~ 2 0
140 SNR G032.5+00.1 SNR 18 50 05.000 -00 25 00.00           ~ 50 1
141 RX J1852.6+0039 X 18 52 40.12 +00 39 06.7           ~ 5 0
142 AX J1855.8+0129 X 18 55 52 +01 29.5     14.30     ~ 3 0
143 TYC 453-327-1 SB* 18 56 09.5638891248 +02 17 43.770440436   10.72 9.95 9.798   ~ 5 0
144 AX J1856.7+0220 X 18 56 43 +02 20.3           ~ 2 0
145 AX J1856.8+0245 X 18 56 51 +02 45.8           ~ 4 0
146 AX J1857.3+0247 X 18 57 21 +02 47.5           ~ 3 0
147 AX J1857.8+0240 X 18 57 51 +02 40.3           ~ 2 0
148 AX J1859.0+0333 X 18 59 07.5 +03 33 33           ~ 2 1
149 AX J1900.1+0427 X 19 00 08 +04 27.6           ~ 2 0
150 SNR G038.6+00.0 SR? 19 01 44 +04 59.3           ~ 3 0
151 AX J1905.5+0659 X 19 05 35 +06 59.0     15.00     ~ 3 0
152 RX J1907.5+0708 X 19 07 34.6 +07 08 21           ~ 5 0
153 AX J1907.8+0803 X 19 07 50 +08 03.5           ~ 1 0
154 AX J1908.2+0832 X 19 08 14 +08 32.5           ~ 1 0
155 AX J1908.3+0745 X 19 08 19 +07 45.4           ~ 1 0
156 2E 4200 HXB 19 10 43.551 +09 16 29.83           B 24 0
157 RX J1911.0+0906 X 19 11 00.80 +09 06 15.6           ~ 5 0
158 AX J1941.8+2251 X 19 41 53 +22 51.7           ~ 2 0
159 AX J1943.1+2318 X 19 43 10 +23 18.8     12.10     ~ 2 0
160 AX J1943.5+2323 X 19 43 33 +23 23.9           ~ 2 0
161 AX J1946.3+2436 X 19 46 22 +24 36.8     12.40     ~ 3 0
162 EM* VES 52 Em* 19 46 50 +25 12.9   15.20 13.48     ~ 7 0
163 AX J1949.6+2631 X 19 49 40 +26 31.8           ~ 2 0
164 AX J1949.8+2534 X 19 49 52 +25 34.4           ~ 10 0
165 AX J1950.1+2628 X 19 50 06 +26 28.3     13.70     ~ 4 0
166 NAME Galactic Ridge ? ~ ~           ~ 499 1

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