2005ApJ...635.1103B

Query : 2005ApJ...635.1103B

2005ApJ...635.1103B - Astrophys. J., 635, 1103-1115 (2005/December-3)

INTEGRAL SPI observation of the Galactic central radian: contribution of discrete sources and implication for the diffuse emission.

BOUCHET L., ROQUES J.P., MANDROU P., STRONG A., DIEHL R., LEBRUN F. and TERRIER R.

Abstract (from CDS):

The INTEGRAL observatory has been performing a deep survey of the Galactic central radian since 2003, with the goal of both extracting a catalog of sources and gaining insight into the Galactic diffuse emission. This paper concentrates on the estimation of the total point-source emission contribution. It is now clear that unresolved point sources contribute to the observed diffuse emission; the increasing sensitivity of instruments with time has led to a steady decrease in estimates of this ``diffuse emission.'' We have analyzed the first-year data obtained with the spectrometer and imager SPI on board INTEGRAL. First, a catalog of 63 hard X-ray sources detected, time averaged, during our 2003 Galactic plane survey is derived. Second, after extracting the spectra of the sources detected by SPI, their combined contribution is compared to the total (resolved and unresolved) emission from the Galactic ridge. The data analysis is complex: it requires us to split the total emission into several components, as discrete sources and diffuse emission are superimposed in SPI data. The main result is that point-source emission dominates in the hard X-ray/soft γ-ray domain and contributes around 90% of the total emission around 100 keV, while above 250 keV diffuse electron-positron annihilation, through its three-photon positronium continuum with a positronium fraction ∼0.97 and the 511 keV electron-positron line, dominates over the sources.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: General - Gamma Rays: Observations - Surveys

Simbad objects: 65

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Number of rows : 65
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 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
2 V* BR Cir HXB 15 20 40.8532547060 -57 10 00.206639033   21.4 21.4     B5-A0I 849 1
3 V* QV Nor HXB 15 42 23.3633146128 -52 23 09.577395960   16.3 14.5     B0.2Ia 455 1
4 V* QX Nor LXB 16 12 43.0 -52 25 26           ~ 946 1
5 INTEGRAL1 19 CV* 16 16 37.7619215160 -49 58 44.568123960   17.4   16.2 14.5 ~ 48 0
6 V* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1730 0
7 IGR J16318-4848 HXB 16 31 48.3090342864 -48 49 00.665054832         16.217 B[e]I 181 0
8 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 579 0
9 V* V801 Ara LXB 16 40 55.5976953528 -53 45 04.948107156 17.50 18.20 17.5   17.07 ~ 921 0
10 IGR J16418-4532 HXB 16 41 50.7984926736 -45 32 25.366995132           BN0.5Ia 120 0
11 2MASS J17004888-4139214 HXB 17 00 48.884 -41 39 21.46           Ofpe/WN9 272 0
12 V* V821 Ara LXB 17 02 49.3876391280 -48 47 23.087954544         15.322 ~ 2237 0
13 HD 153919 HXB 17 03 56.7725629224 -37 50 38.913331452 6.06 6.78 6.51 6.08 5.90 O6Iafcp 851 0
14 V* V1101 Sco LXB 17 05 44.4916006152 -36 25 23.049324480   20.10 18.6     ~ 473 0
15 X Ara X-1 LXB 17 06 15.2 -43 02 11           ~ 296 1
16 1RXS J170855.6-440653 LXB 17 08 54.346 -44 06 08.38           ~ 406 1
17 1RXS J171227.5-232140 X 17 12 31 -23 21.2           ~ 5 0
18 V* V2400 Oph CV* 17 12 36.4233668016 -24 14 44.773987164     14.5     ~ 169 0
19 1RXS J171935.6-410054 CV* 17 19 35.8927822656 -41 00 53.529823332   15.60 15.20 15.33 14.3 ~ 68 0
20 2MASS J17251139-3616575 HXB 17 25 11.392 -36 16 57.53     14.30     B0-1Ia 140 2
21 4U 1722-30 LXB 17 27 33.25 -30 48 07.4     12.50     ~ 278 1
22 V* V2216 Oph LXB 17 31 44.17 -16 57 40.9 16.40 17.10 16.8     ~ 329 1
23 NAME Slow Burster LXB 17 31 58.0 -33 49 58     15.50     ~ 865 1
24 V* V2116 Oph Sy* 17 32 02.1532435416 -24 44 44.129169096   20.78 18.4     M6IIIe 719 1
25 Granat 1734-292 Sy2 17 37 28.3811310912 -29 08 02.119558272           ~ 160 1
26 1ES 1735-26.9 LXB 17 38 17.6 -26 59 39           ~ 177 0
27 V* V926 Sco LXB 17 38 58.2384053021 -44 27 00.699118812 16.90 17.70 17.5     ~ 480 0
28 2E 3938 HXB 17 43 54.7 -29 44 44           ~ 693 1
29 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
30 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 805 0
31 AX J1747.4-3000 LXB 17 47 26.0 -30 00 02           ~ 119 0
32 X Sgr X-1 LXB 17 47 56.3 -26 33 47           ~ 402 0
33 4U 1745-203 LXB 17 48 53.40 -20 21 43.0           ~ 86 1
34 2MASS J17485512-3254521 Sy2 17 48 55.13 -32 54 52.1           ~ 61 0
35 4U 1746-371 LXB 17 50 12.66 -37 03 08.2     8.43     ~ 206 1
36 AX J1758.0-2818 X 17 58.0 -28 18           ~ 3 0
37 [KRL2007b] 297 LXB 17 59 45.7 -22 01 39           ~ 68 1
38 4U 1758-25 LXB 18 01 09.7308060816 -25 04 44.120221284     11.08     ~ 705 1
39 2CXO J180112.3-254436 HXB 18 01 12.4783119670 -25 44 35.694663099           AV 417 1
40 [KRL2007b] 304 LXB 18 06 59.8 -29 24 30           ~ 228 0
41 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1316 2
42 V* V4722 Sgr LXB 18 10 44.47 -26 09 01.2   21.5     18.449 ~ 99 0
43 SNR G011.2-00.3 SNR 18 11 28.9 -19 25 29           ~ 305 1
44 SNR G011.8-00.2 SNR 18 12.4 -18 44           ~ 25 0
45 V* V5512 Sgr LXB 18 14 31.3 -17 09 23     12.73     K5III 449 0
46 4U 1812-12 LXB 18 15 06.4 -12 05 48           ~ 124 2
47 V* NP Ser LXB 18 16 01.7 -14 02 09   18.8       K 683 2
48 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 1056 1
49 AX J1825.1-1253 X 18 25 10 -12 53.3     12.23     ~ 3 0
50 V* V691 CrA LXB 18 25 46.8185061768 -37 06 18.529336656 14.30 15.20 15.1     ~ 461 0
51 V* V4634 Sgr LXB 18 29 28.8 -23 47 48 18.90 19.40 19     ~ 399 0
52 2MASS J18322828-0756420 gam 18 32 28.2668437896 -07 56 41.850226932           ~ 27 0
53 SNR G021.5-00.9 SNR 18 33 33.612 -10 34 07.69           ~ 490 1
54 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 724 1
55 Cl* NGC 6652 SAW V10 LXB 18 35 43.9 -32 59 18     18.9     ~ 104 0
56 SNR G027.3+00.0 SNR 18 41 17.8 -04 56 12           ~ 345 3
57 RX J1852.6+0039 X 18 52 40.12 +00 39 06.7           ~ 5 0
58 4U 1850-086 LXB 18 53 04.89 -08 42 19.7 20.40 21.20 21.0     ~ 266 1
59 V* V1223 Sgr CV* 18 55 02.3108012664 -31 09 49.584656268           ~ 347 0
60 XTE J1855-026 HXB 18 55 30.4058947392 -02 36 16.737653700   16.451 14.512 14.056   B0Iaep 104 0
61 4U 1901+03 HXB 19 03 39.3926409480 +03 12 15.758070228           B8-9IV 122 0
62 4U 1908+075 HXB 19 10 48.2133201408 +07 35 51.707133960           O7.5/9.5If 139 0
63 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.854 14.643     A7Ib 2253 4
64 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2810 0
65 V* V1405 Aql LXB 19 18 47.6 -05 14 18 20.90 21.40 21.0     ~ 495 0

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