2008A&A...491..209R

Query : 2008A&A...491..209R

2008A&A...491..209R - Astronomy and Astrophysics, volume 491, 209-217 (2008/11-3)

Low-mass X-ray binaries in the bulge of the Milky Way.

REVNIVTSEV M., LUTOVINOV A., CHURAZOV E., SAZONOV S., GILFANOV M., GREBENEV S. and SUNYAEV R.

Abstract (from CDS):

We study the population of low-mass X-ray binaries (LMXBs) in the Galactic bulge using the deep survey of this region by the IBIS telescope aboard the INTEGRAL observatory. Thanks to the increased sensitivity with respect to previous surveys of this field, we succeeded in probing the luminosity function (LF) of LMXBs down to ∼7x1034erg/s in the 17-60keV energy band. The slope of the 17-60keV LF in the 1035-1037erg/s range is dlogN/dlogL=-0.96±0.20. At these low luminosities, the spectra of LMXBs between 2 and 60keV are similar to that of the Crab, and therefore nearly equal amounts of energy are released in the standard (2-10keV) and hard (17-60keV) X-ray bands. This implies that the LMXB LF is flat both in the 17-60keV and 2-10keV energy bands over the 1035-1037erg/s luminosity range. This further suggests that the faint end of the 2-10keV LF is significantly flatter than its bright end (above 1037erg/s), where a slope of dlogN/dlogL~-1.8 was previously measured. We discuss the origin of this flattening. We also demonstrate that the spatial distribution of persistent LMXBs in the Galactic center/Galactic bulge region is consistent with a model of stellar mass distribution that includes the nuclear stellar disk component in the innermost degree of the Galaxy. The spatial distribution of transient LMXBs detected in the Galactic center region indicates an increased fraction of transient sources in the innermost degree of the Galaxy with respect to outer regions.

Abstract Copyright: ∼

Journal keyword(s): binaries: general - stars: luminosity function, mass function - Galaxy: bulge - X-rays: binaries - X-rays: general

CDS comments: Table 1 IGR J17448-3231 is probably IGR J17448-3232 in Simbad. GRS 1747-313 is Granat 1747-312.

Simbad objects: 73

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Number of rows : 73
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12651 1
2 M 1 SNR 05 34 30.9 +22 00 53           ~ 6193 1
3 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5261 0
4 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1463 0
5 NGC 4278 LIN 12 20 06.8242 +29 16 50.722 11.54 11.09 10.16     ~ 946 2
6 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4486 3
7 4U 1705-32 LXB 17 08 54.40 -32 18 57.5           ~ 59 0
8 [KRL2007b] 222 LXB 17 09 07.61 -36 24 25.7           ~ 284 1
9 [KRL2007b] 224 HX? 17 09 46.124 -36 27 57.31   21.16       ~ 49 0
10 V* V1228 Sco LXB 17 19 58.990 -31 45 01.11           ~ 115 1
11 2MASS J17251139-3616575 HXB 17 25 11.392 -36 16 57.53     14.30     B0-1Ia 126 2
12 [KRL2007b] 238 LXB 17 25 25.50 -32 57 17.5     14.50     ~ 47 0
13 4U 1722-30 LXB 17 27 33.25 -30 48 07.4     12.50     ~ 265 1
14 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5     15.50     ~ 824 1
15 V* V2116 Oph Sy* 17 32 02.1532435416 -24 44 44.129169096   20.78 18.4     M6IIIe 692 1
16 [KRL2007b] 247 BH? 17 33 13 -24 09.4           ~ 16 0
17 NAME Rapid Burster LXB 17 33 24.61 -33 23 19.8           ~ 414 2
18 IGR J17353-3257 HX? 17 35 18.0 -32 57 00           ~ 5 0
19 IGR J17353-3539 HX? 17 35 23.6138988984 -35 40 12.820419300       15.77 12.74 ~ 11 0
20 Granat 1734-292 Sy2 17 37 28.3811310912 -29 08 02.119558272           ~ 143 0
21 1ES 1735-26.9 LXB 17 38 17.12 -26 59 38.6           ~ 167 0
22 AX J1739.1-3020 HXB 17 39 11.5515537336 -30 20 37.787917704     14.40 13.91   O8.5Iab(f) 157 1
23 RX J1739.4-2942 LXB 17 39 29.87 -29 42 10.7           Be? 38 0
24 [KRL2007b] 258 LXB 17 39 53.95 -28 29 46.8           ~ 98 0
25 NGC 6400 OpC 17 40 14.9 -36 57 25     8.8     ~ 32 0
26 2RXP J174040.9-280852 HXB 17 40 41.2 -28 08 50           ~ 27 1
27 2E 1737.5-2817 LXB 17 40 42.84 -28 18 08.5           ~ 79 0
28 [KRL2007b] 262 gam 17 41 56.0 -28 01 55           ~ 16 0
29 SWIFT J1743.1-3620 HXB 17 43 01.3294550646 -36 22 22.218956366       16.8   OI 47 0
30 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 674 1
31 SWIFT J1744.6-3232 gam 17 44 37.46 -32 32 20.2           ~ 20 0
32 KS 1741-293 LXB 17 44 51.63 -29 20 42.8           ~ 102 0
33 2XMM J174502.1-285450 LXB 17 45 02.33 -28 54 49.7           ~ 133 0
34 AX J1745.6-2901 LXB 17 45 35.6400 -29 01 33.888           ~ 172 1
35 1A 1742-289 X 17 45 37.1832 -29 01 04.656           ~ 92 1
36 [KRL2007b] 270 gam 17 45 38.5 -29 01 15           ~ 26 0
37 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14420 0
38 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4392 3
39 2MASS J17455993-2854498 LXB 17 45 59.94 -28 54 49.8     11.93     ~ 15 0
40 2E 3943 LXB 17 46 05.20 -29 30 53.3           ~ 209 1
41 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 745 0
42 2E 3944 LXB 17 46 21.09 -28 43 42.3     12.50     ~ 121 0
43 [KRL2007b] 275 LXB 17 47 02.60 -28 52 58.9     14.20     ~ 177 0
44 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2266 1
45 1RXS J174725.6-300241 LXB 17 47 25.4 -30 02 41           ~ 63 0
46 AX J1747.4-3000 LXB 17 47 25.90 -30 00 02.0           ~ 108 0
47 IGR J17475-2253 AGN 17 47 30.0 -22 53 00           ~ 4 0
48 CXOGCS J174742.4-282228 MoC 17 47 42.41 -28 22 28.1           ~ 47 1
49 X Sgr X-1 LXB 17 47 56.0 -26 33 49           ~ 375 0
50 [KRL2007b] 281 LXB 17 48 13.148 -36 07 57.02     20.9     ~ 102 0
51 4U 1745-203 LXB 17 48 53.40 -20 21 43.0           ~ 84 1
52 2MASS J17485512-3254521 Sy2 17 48 55.13 -32 54 52.1           ~ 54 0
53 2XMM J174906.8-273232 HXB 17 49 06.79 -27 32 32.4           B1-3 48 0
54 2XMM J174912.3-272537 HXB 17 49 12.28 -27 25 37.4           B3 34 0
55 RX J1749.8-3312 LXB 17 49 48.940 -33 12 11.60           ~ 58 0
56 4U 1746-371 LXB 17 50 12.66 -37 03 08.2     8.43     ~ 195 1
57 IGR J17505-2644 gam 17 50 30.0 -26 44 00           ~ 7 0
58 Granat 1747-312 LXB 17 50 46.862 -31 16 28.86           ~ 118 1
59 [KRL2007b] 291 LXB 17 51 13.49 -30 37 23.4           ~ 246 0
60 IGR J17544-2619 HXB 17 54 25.2722906112 -26 19 52.576928292   14.71 12.94 12.10 10.38 O9Ib 190 0
61 IGR J17585-3057 gam 17 58 30.0 -30 57 00           ~ 13 1
62 IGR J17586-2129 HXB 17 58 34.5557606184 -21 23 21.534625068           ~ 29 0
63 [KRL2007b] 297 LXB 17 59 45.7 -22 01 39           ~ 64 1
64 4U 1758-25 LXB 18 01 09.7308060816 -25 04 44.120221284     11.08     ~ 655 1
65 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 392 1
66 X Sgr X-3 LXB 18 01 32.3 -20 31 44           ~ 235 1
67 SAX J1802.7-2017 HXB 18 02 41.9407199832 -20 17 17.312648064   17.4 16.4     BIII 89 0
68 [KRL2007b] 304 LXB 18 06 59.8 -29 24 30           ~ 219 0
69 [KRL2007b] 312 LXB 18 17 43.537 -33 01 07.80           ~ 171 0
70 XTE J1818-245 LXB 18 18 24.430 -24 32 17.96           ~ 37 0
71 V* V4634 Sgr LXB 18 29 28.2 -23 47 49 18.90 19.40 19     ~ 350 0
72 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2628 0
73 NAME Galactic Bulge reg ~ ~           ~ 4299 0

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