2014A&A...563A..46M


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.27CET22:43:43

2014A&A...563A..46M - Astronomy and Astrophysics, volume 563A, 46-46 (2014/3-1)

X-ray observation of ULAS J1120+0641, the most distant quasar at z = 7.08.

MORETTI A., BALLO L., BRAITO V., CACCIANIGA A., DELLA CECA R., GILLI R., SALVATERRA R., SEVERGNINI P. and VIGNALI C.

Abstract (from CDS):

We probe the emission mechanism of the accreting super massive black holes in the high redshift Universe and, to do this, we study the X-ray spectrum of ULAS1120+064, the highest redshift quasar detected so far at z=7.085, which has been deeply observed (340ks) by XMM-Newton. Despite the long integration time, the spectral analysis is limited by the poor statistics, with only 150 source counts being detected. We measured the spectrum in the 2-80keV rest-frame (0.3-10keV observed) energy band. Assuming a simple power law model, we find a photon index of 2.0±0.3 and a luminosity of 6.7±0.3x1044erg/s in the 2-10keV band, while the intrinsic absorbing column can only be loosely constrained (NH<1023cm–2). Combining our measure with published data, we calculate that the X-ray-to-optical spectral index αOX is 1.8±0.1, in agreement with the αOX-UV luminosity correlation that is valid for lower redshift quasars. This is the second time that a z>6 quasar has been investigated through a deep X-ray observation. In agreement with previous studies of z∼6 AGN samples, we do not find any hint of evolution in the broadband energy distribution. Indeed from our dataset, ULAS 1120+0641 is indistinguishable from the population of optically bright quasar at lower redshift.

Abstract Copyright:

Journal keyword(s): quasars: supermassive black holes - quasars: individual: ULAS J1120+0641 - early Universe

Simbad objects: 2

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Number of rows : 2

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 SDSS J103027.09+052455.0 QSO 10 30 27.092 +05 24 55.02   26.15 25.44     ~ 217 0
2 QSO J1120+0641 QSO 11 20 01.48 +06 41 24.3           ~ 164 0

    Equat.    Gal    SGal    Ecl

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2020.02.27-22:43:43

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