2010A&A...512A..49T


Query : 2010A&A...512A..49T

2010A&A...512A..49T - Astronomy and Astrophysics, volume 512, A49-49 (2010/3-1)

INTEGRAL hard X-ray spectra of the cosmic X-ray background and Galactic ridge emission.

TUERLER M., CHERNYAKOVA M., COURVOISIER T.J.-L., LUBINSKI P., NERONOV A., PRODUIT N. and WALTER R.

Abstract (from CDS):

We derive the spectra of the cosmic X-ray background (CXB) and of the Galactic ridge X-ray emission (GRXE) in the ∼20-200keV range from the data of the IBIS instrument aboard the INTEGRAL satellite obtained during the four dedicated Earth-occultation observations in early 2006. We analyze the modulation of the IBIS/ISGRI detector counts induced by the passage of the Earth through the field of view of the instrument. Unlike previous studies, we do not fix the spectral shape of the various contributions, but model instead their spatial distribution and derive for each of them the expected modulation of the detector counts. The spectra of the diffuse emission components are obtained by fitting the normalizations of the model lightcurves to the observed modulation in different energy bins. Because of degeneracy, we guide the fits with a realistic choice of the input parameters and a constraint for spectral smoothness. The obtained CXB spectrum is consistent with the historic HEAO-1 results and falls slightly below the spectrum derived with Swift/BAT. A 10% higher normalization of the CXB cannot be completely excluded, but it would imply an unrealistically high albedo of the Earth. The derived spectrum of the GRXE confirms the presence of a minimum around 80 keV with improved statistics and yields an estimate of ∼0.6M for the average mass of white dwarfs in the Galaxy. The analysis also provides updated normalizations for the spectra of the Earth's albedo and the cosmic-ray induced atmospheric emission. This study demonstrates the potential of INTEGRAL Earth-occultation observations to derive the hard X-ray spectra of three fundamental components: the CXB, the GRXE and the Earth emission. Further observations would be extremely valuable to confirm our results with improved statistics.

Abstract Copyright:

Journal keyword(s): earth - Galaxy: disk - galaxies: active - diffuse radiation - X-rays: diffuse background - X-rays: general

Simbad objects: 28

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Number of rows : 28
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 2MASS J14471488-6317192 Sy2 14 47 14.88 -63 17 19.2           ~ 18 0
2 2MASX J14513316-5540388 Sy2 14 51 33.1399230504 -55 40 38.331391008           ~ 41 0
3 IGR J14532-6356 gam 14 53 15 -63 55.6           ~ 4 0
4 2MASS J15092601-6649232 CV* 15 09 26.0168351808 -66 49 23.279486268           ~ 42 0
5 PSR B1509-58 Psr 15 13 55.52 -59 08 08.8     13.06     ~ 823 1
6 SWIFT J1535.8-5749 AG? 15 35 52.8 -57 50 55           ~ 20 0
7 V* QV Nor HXB 15 42 23.3633146128 -52 23 09.577395960   16.3 14.5     B0.2Ia:e 398 1
8 V* QU TrA LXB 15 47 54.6 -62 34 06           ~ 146 0
9 INTEGRAL1 19 CV* 16 16 37.7619215160 -49 58 44.568123960   17.4   16.2 14.5 ~ 39 0
10 CXOU J162046.2-513006 HXB 16 20 46.2644580432 -51 30 06.045320232   18.9   16.28 13.4 B8IIIe 59 0
11 SWIFT J1626.5-5156 HXB 16 26 36.5197704024 -51 56 30.600051936       16.03 14.59 B0V 77 0
12 IGR J16283-4838 HXB 16 28 10.83216 -48 38 56.0904           OBsg 32 0
13 IGR J16318-4848 HXB 16 31 48.3090342864 -48 49 00.665054832           ~ 166 0
14 3FHL J1633.0-4746e HXB 16 32 01.87 -47 52 28.3           O8I 165 3
15 V* KZ TrA LXB 16 32 16.79 -67 27 39.3 17.40 18.60 18.5     ~ 553 1
16 NAME Triangulum Australis Cluster ClG 16 38 16.1 -64 20 50           ~ 110 0
17 NAME AX J163904-4642 HXB 16 39 06 -46 42.2           BIV-V 89 1
18 V* V801 Ara LXB 16 40 55.5976953528 -53 45 04.948107156 17.50 18.20 17.5   17.07 ~ 838 1
19 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 2009 0
20 IGR J17008-6425 gam 17 00 49 -64 25.5           ~ 6 0
21 [KRL2007b] 214 LXB 17 00 58.46 -46 11 08.6           ~ 230 0
22 V* V821 Ara HXB 17 02 49.3876391280 -48 47 23.087954544 16.20 16.30 15.5     ~ 1960 0
23 IGR J17062-6143 LXB 17 06 16.2820758768 -61 42 40.593758076           ~ 74 0
24 NGC 6300 Sy2 17 16 59.5418094960 -62 49 13.946588832   10.88 13.08 9.44 10.2 ~ 406 0
25 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13329 0
26 ESO 103-35 Sy2 18 38 20.3204821536 -65 25 39.141804936   14.75 14.53 13.24   ~ 297 0
27 NAME Galactic Bulge reg ~ ~           ~ 3972 0
28 NAME Galactic Ridge ? ~ ~           ~ 476 1

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2022.12.06-19:17:54

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