2005A&A...441....9A


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST02:02:26

2005A&A...441....9A - Astronomy and Astrophysics, volume 441, 9 (2005/10-1)

Spectral energy distribution of the metagalactic ionizing radiation field from QSO absorption spectra.

AGAFONOVA I.I., CENTURION M., LEVSHAKOV S.A. and MOLARO P.

Abstract (from CDS):

A computational procedure is presented to estimate the spectral shape of the ionizing background between 1 and 10Ryd by analyzing optically thin absorption systems in the spectra of high redshift quasars. The procedure is based on the response surface methodology from the theory of experimental design. The shape of the recovered UV background at z∼3 shows a significant intensity decrease between 3 and 4Ryd compared to the metagalactic spectrum of Haardt & Madau (1996ApJ...461...20H). This decrease is interpreted as produced by HeII Gunn-Peterson effect. There are no features indicating a contribution from galaxies to the UV background which is therefore dominated by QSOs at z∼3.

Abstract Copyright:

Journal keyword(s): cosmology: observations - line: formation - line: profiles - Galaxy: abundances - galaxies: quasars: absorption lines

Nomenclature: paragr.3.3: [ACL2005] QSO J0942-1104 abs N.NNNN N=1.

Simbad objects: 8

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Number of rows : 8

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 QSO B0347-383 QSO 03 49 43.6605705480 -38 10 30.834942758     17.3     ~ 178 0
2 [LAD2003] QSO J0349-3810 abs 2.96591 ALS 03 49 43.68 -38 10 31.3           ~ 2 0
3 [ACL2005] QSO J0942-1104 abs 2.9375 ALS 09 42 53.50 -11 04 25.9           ~ 1 0
4 QSO B0940-1050 QSO 09 42 53.5076745009 -11 04 25.929146122   16.96 16.6 16.6   ~ 86 0
5 QSO J2233-606 QSO 22 33 37.5814904803 -60 33 29.146578276 16.90 17.39 17.16 16.93 16.51 ~ 86 0
6 [LAC2002] QSO J2233-6033 abs 1.94 ALS 22 33 37.59 -60 33 29.1           ~ 3 0
7 QSO B2347-4342 QSO 23 50 34.2595236845 -43 25 59.680334378   16.3 16.3     ~ 159 0
8 [CMV2003] QSO J0942-1104 abs 2.917 DLA ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2020.08.14-02:02:26

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