Article (Scientific journals)
HST observations of the QSO pair Q1026-0045A,B
Petitjean, Patrick; Surdej, Jean; Smette, Alain et al.
1998In Astronomy and Astrophysics, 334, p. 45-L48
Peer Reviewed verified by ORBi
 

Files


Full Text
Petitjean_A&A_1998_334_L45_L48.pdf
Publisher postprint (167.82 kB)
Download

The authors thank SAO/NASA ADS Astronomy Abstract Service for their deposit authorization and EDP Sciences for the publication


All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
QUASARS: INDIVIDUAL: Q 1026-0045A; GALAXIES: ISM; QUASARS:ABSORPTION LINES; GALAXIES: HALO
Abstract :
[en] The spatial distribution of the Lyalpha forest is studied using new HST data for the quasar pair Q 1026-0045 A and B at z_em = 1.438 and 1.520 respectively. The angular separation is 36 arcsec and corresponds to transverse linear separations between lines of sight of ~ 300h(-1}_{50) kpc (q_o = 0.5) over the redshift range 0.833 < z < 1.438. From the observed numbers of coincident and anti-coincident Lyalpha absorption lines, we conclude that, at this redshift, the Lyalpha structures have typical dimensions of ~ 500h(-1}_{50) kpc, larger than the mean separation of the two lines of sight. The velocity difference, Delta V, between coincident lines is surprisingly small (4 and 8 pairs with Delta V < 50 and 200 km s(-1) respectively). Metal line systems are present at z_abs = 1.2651 and 1.2969 in A, z_abs = 0.6320, 0.7090, 1.2651 and 1.4844 in B. In addition we tentatively identify a weak Mg ii system at z_abs = 0.11 in B. It is remarkable that the z_abs = 1.2651 system is common to both lines of sight. The system at z_abs = 1.4844 has strong O vi absorption. There is a metal-poor associated system at z_abs = 1.4420 along the line of sight to A with complex velocity profile. We detect a strong Lyalpha absorption along the line of sight to B redshifted by only 300 km s(-1) relatively to the associated system. It is tempting to interpret this as the presence of a disk of radius larger than 300h(-1}_{50) kpc surrounding quasar A. Based on observations obtained with the NASA/ESA Hubble Space Telescope by the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Petitjean, Patrick;  Institut d'Astrophysique de Paris - CNRS, 98bis Boulevard Arago, F-75014 Paris, France ; UA CNRS 173-DAEC, Observatoire de Paris-Meudon, F-92195 Meudon Principal Cedex, France
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Smette, Alain;  NASA-Goddard Space Flight Center, Code 681, Greenbelt, MD 20771, USA
Shaver, Peter;  European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei Muenchen, Germany
Muecket, Jan;  Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
Remy, Marc;  Institut d'Astrophysique, Universitede Liege, Avenue de Cointe 5, B-4000 Liege, Belgium
Language :
English
Title :
HST observations of the QSO pair Q1026-0045A,B
Publication date :
1998
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
334
Pages :
L45-L48
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://arxiv.org/abs/astro-ph/9804242
Available on ORBi :
since 17 December 2009

Statistics


Number of views
43 (1 by ULiège)
Number of downloads
54 (1 by ULiège)

Scopus citations®
 
39
Scopus citations®
without self-citations
22

Bibliography


Similar publications



Contact ORBi