2009A&A...493..501M


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.10CEST20:05:39

2009A&A...493..501M - Astronomy and Astrophysics, volume 493, 501-509 (2009/1-2)

A new measurement of the cosmic X-ray background.

MORETTI A., PAGANI C., CUSUMANO G., CAMPANA S., PERRI M., ABBEY A., AJELLO M., BEARDMORE A.P., BURROWS D., CHINCARINI G., GODET O., GUIDORZI C., HILL J.E., KENNEA J., NOUSEK J., OSBORNE J.P. and TAGLIAFERRI G.

Abstract (from CDS):

We present a new measurement of the cosmic X-ray background (CXRB) in the 1.5-7keV energy band, performed by exploiting the Swift X-ray telescope (XRT) data archive. We also present a CXRB spectral model in a wider energy band (1.5-200keV), obtained by combining these data with the recently published Swift-BAT measurement. From the XRT archive we collect a complete sample of 126 high Galactic latitude gamma-ray burst (GRB) follow-up observations. This provides a total exposure of 7.5Ms and a sky-coverage of ∼7 square degrees which represents a serendipitous survey, well suited for a direct measurement of the CXRB in the 1.5-10keV interval. Our work is based on a complete characterization of the instrumental background and an accurate measurement of the stray-light contamination and vignetting calibration. We find that the CXRB spectrum in the 1.5-7keV energy band can be equally well fitted by a single power-law with photon index Γ=1.47±0.07 or a single power-law with photon index Γ=1.41±0.06 and an exponential roll-off at 41keV. The measured flux in the 2-10keV energy band is 2.18 ±0.13x10–11erg/cm2/s/deg2 in the 2-10keV band. Combining Swift-XRT with Swift-BAT (15-200keV) we find that, in the 1.5-200keV band, the CXRB spectrum can be well described by two smoothly-joined power laws with the energy break at 29.0±0.5keV corresponding to a νFν peak located at 22.4±0.4keV. Taking advantage of both the Swift high energy instruments (XRT and BAT), we produce an analytical description of the CXRB spectrum over a wide (1.5-200keV) energy band. This model is marginally consistent with the HEAO1 measurement (∼10% higher) at energies higher than 20keV, while it is significantly (30%) higher at low energies (2-10keV).

Abstract Copyright:

Journal keyword(s): X-rays: diffuse background - surveys - instrumentation: miscellaneous

Status at CDS:  

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9303 1
2 SNR B0102-72.3 SNR 01 04 01.2 -72 01 52           ~ 342 1
3 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5549 4
4 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5286 1
5 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1523 0
6 GRB 080319C gB 17 15 55.48 +55 23 31.7           ~ 135 0
7 ACO S 1136 ClG 23 36 14.3 -31 36 24           ~ 22 0
8 GRB 071028B gB 23 36 38.83 -31 37 13.3           ~ 16 0
9 NAME Local Bubble ISM ~ ~           ~ 683 0

    Equat.    Gal    SGal    Ecl

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2020.04.10-20:05:39

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