2012A&A...548A..87M


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST06:01:57

2012A&A...548A..87M - Astronomy and Astrophysics, volume 548A, 87-87 (2012/12-1)

Spectrum of the unresolved cosmic X-ray background: what is unresolved 50 years after its discovery.

MORETTI A., VATTAKUNNEL S., TOZZI P., SALVATERRA R., SEVERGNINI P., FUGAZZA D., HAARDT F. and GILLI R.

Abstract (from CDS):

We study the spectral properties of the unresolved cosmic X-ray background (CXRB) in the 1.5-7.0 keV energy band with the aim of providing an observational constraint on the statistical properties of those sources that are too faint to be individually probed. We made use of the Swift X-ray observation of the Chandra deep field South complemented by the Chandra data. Exploiting the lowest instrument background (Swift) together with the deepest observation ever performed (Chandra) we measured the unresolved emission at the deepest level and with the best accuracy available today. We find that the unresolved CXRB emission can be modeled by a single power law with a very hard photon index Γ=0.1±0.7 and a flux of 5+3.2–2.6x10–12 erg/s/cm2/deg2 in the 2.0-10keV energy band (1σ error). Thanks to the low instrument background of the Swift-XRT, we significantly improved the accuracy with respect to previous measurements. These results point towards a novel ingredient in AGN population synthesis models, namely a positive evolution of the Compton-thick AGN population from local Universe to high redshift.

Abstract Copyright:

Journal keyword(s): X-rays: diffuse background - X-rays: general - galaxies: active

Status at CDS:  

Simbad objects: 6

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Number of rows : 6

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 GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1045 1
2 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1803 1
3 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5573 4
4 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 607 0
5 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1524 0
6 NAME Local Bubble ISM ~ ~           ~ 691 0

    Equat.    Gal    SGal    Ecl

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2020.05.27-06:01:57

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