2007A&A...473..805W


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET22:09:24

2007A&A...473..805W - Astronomy and Astrophysics, volume 473, 805-818 (2007/10-3)

The transverse proximity effect in spectral hardness on the line of sight towards HE 2347-4342.

WORSECK G., FECHNER C., WISOTZKI L. and DALL'AGLIO A.

Abstract (from CDS):

We report the discovery of 14 quasars in the vicinity of HE 2347-4342, one of the two quasars whose intergalactic HeII forest has been resolved with FUSE. By analysing the HI and the HeII opacity variations separately, no transverse proximity effect is detected near three foreground quasars of HE 2347-4342: QSO J23503-4328 (z=2.282, θ=3.59'), QSO J23500-4319 (z=2.302, θ=8.77') and QSO J23495-4338 (z=2.690, θ=16.28'). This is primarily due to line contamination and overdensities probably created by large-scale structure. By comparing the HI absorption and the corresponding HeII absorption, we estimated the fluctuating spectral shape of the extragalactic UV radiation field along this line of sight. We find that the UV spectral shape near HE 2347-4342 and in the projected vicinity of the three foreground quasars is statistically harder than expected from UV background models dominated by quasars. In addition, we find three highly ionised metal line systems near the quasars. However, they do not yield further constraints on the shape of the ionising field. We conclude that the foreground quasars show a transverse proximity effect that is detectable as a local hardening of the UV radiation field, although the evidence is strongest for QSO J23495-4338. Thus, the relative spectral hardness traces the proximity effect also in overdense regions prohibiting the traditional detection in the HI forest. Furthermore, we emphasise that softening of quasar radiation by radiative transfer in the intergalactic medium is important to understand the observed spectral shape variations. From the transverse proximity effect of QSO J23495-4338 we obtain a lower limit on the quasar lifetime of ∼25Myr.

Abstract Copyright:

Journal keyword(s): galaxies: quasars: general - galaxies: quasars: absorption lines - galaxies: intergalactic medium - cosmology: diffuse radiation

Nomenclature: Table 1: [WFW2007] JHHMMm+DDMM N=14. Text: [WFW2007] QSO JHHMM+DDMM abs N.NNNN N=3+1+1+1.

Simbad objects: 21

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Number of rows : 21

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 LBQS 0301-0035 QSO 03 03 41.0490260705 -00 23 21.909853081   18.26 17.93 17.6   ~ 99 0
2 [WW2006] D QSO 03 04 30.4 -00 08 11     24.3     ~ 6 0
3 LBQS 0302-0019 QSO 03 04 49.8591748182 -00 08 13.537401746   18.08 17.80 17.5   ~ 229 0
4 HS 1700+6416 QSO 17 01 00.6195618802 +64 12 09.118927057   16.39 16.17     ~ 330 0
5 [L92b] Mark A HS* 20 43 59.2255386146 -10 47 41.693629843 11.854 13.010 13.256 13.370 13.494 sdO 66 1
6 PG 2213-006 HS* 22 16 28.3762668612 -00 21 13.502700359 12.747 13.93 14.14 14.54 14.348 sdOB 72 0
7 QSO J2349-4338 QSO 23 49 34.5383401594 -43 38 08.683741228   20.21       ~ 4 0
8 [WFW2007] J23500-4319 QSO 23 50 00.28 -43 19 46.1           ~ 1 0
9 [WFW2007] J23502-4334 QSO 23 50 16.1850588586 -43 34 14.742611556   18.95       ~ 4 0
10 QSO J2350-4328 QSO 23 50 21.5587614537 -43 28 43.727578587   20.66       ~ 3 0
11 QNQ J23503-4317 QSO 23 50 21.9355632352 -43 17 30.171729778   21.94       ~ 3 0
12 QSO B2347-4342 QSO 23 50 34.2595236845 -43 25 59.680334378   16.3 16.3     ~ 159 0
13 QSO J2350-4319 QSO 23 50 44.9647323061 -43 19 26.033615977   19.90       ~ 3 0
14 QNQ J23507-4326 QSO 23 50 45.3930955363 -43 26 37.044242345   21.05       ~ 3 0
15 [WFW2007] J23508-4335 QSO 23 50 52.91 -43 35 06.8           ~ 1 0
16 2MASS J23505478-4330424 QSO 23 50 54.8215855179 -43 30 42.307180120   18.23       ~ 3 0
17 QNQ J23510-4336 QSO 23 51 05.5230356626 -43 36 57.287176459   20.74       ~ 3 0
18 QSO J2351.1-4319 QSO 23 51 09.4608204065 -43 19 41.573051348   21.00       ~ 3 0
19 [WFW2007] J23512-4332 QSO 23 51 15.18 -43 32 34.3           ~ 1 0
20 QNQ J23514-4339 QSO 23 51 25.5453579768 -43 39 03.046832216   21.57       ~ 3 0
21 [WFW2007] J23515-4324 QSO 23 51 33.05 -43 24 45.2           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2019.12.12-22:09:24

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