A Study of Quasar Proximity in O VI Absorbers at z=2-3 (2008)
Fox, Andrew J., Bergeron, Jacqueline, Petitjean, Patrick
(Abridged) With the goal of investigating the nature of OVI absorbers at high redshifts, we study the effects of proximity to the background quasar. In a sample of sixteen quasars at z(QSO) between...
Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey (2007)
Willott, Chris J., Delorme, Philippe, Omont, Alain, Bergeron, Jacqueline, Delfosse, Xavier, Forveille, Thierry, ...
The Canada-France High-z Quasar Survey (CFHQS) is an optical survey designed to locate quasars during the epoch of reionization. In this paper we present the discovery of the first four CFHQS quasars...
The missing metals problem. III How many metals are expelled from galaxies? (2007)
Bouche, Nicolas, Lehnert, Matthew D., Aguirre, Anthony, Peroux, Celine, Bergeron, Jacqueline
[Abridged] We revisit the metal budget at z~2. In the first two papers of this series, we already showed that ~30% (to
The missing metals problem – III. How many metals are expelled from galaxies? (2007)
Bouché, Nicolas, Lehnert, Matthew D., Aguirre, Anthony, Peroux, Celine, Bergeron, Jacqueline
The warm-hot intergalactic medium at z~2.2: Metal enrichment and ionization source (2005)
Bergeron, Jacqueline, Aracil, Bastien, Petitjean, Patrick, Pichon, Christophe
Results are presented for our search for warm-hot gas towards the quasar Q 0329-385. We identify ten OVI systems of which two are within 5000 km/s of z_em and a third one should be of intrinsic...
Metals in the Intergalactic Medium (2005)
Aracil, Bastien, Petitjean, Patrick, Pichon, Christophe, Bergeron, Jacqueline
We use high spectral resolution (R=45000) and high signal-to-noise ratio (S/N \\~ 35-70 per pixel) spectra of 19 high-redshift (2.1
Highly ionized absorbers at high redshift (2005)
Bergeron, Jacqueline, Herbert-Fort, Stéphane
We investigate the existence of a metal-rich OVI population in 10 high spectral resolution quasar spectra and define observational criteria for this class of absorbers. The low temperatures of nearly...
Norman, Colin, Ptak, Andrew, Hornschemeier, Ann, Hasinger, Guenther, Bergeron, Jacqueline, Comastri, Andrea, ...
The cosmological star formation rate in the combined Chandra Deep Fields North and South is derived from our X-Ray Luminosity Function for Galaxies in these Deep Fields. Mild evolution is seen up to...
Metals in the Intergalactic Medium (2004)
Aracil, Bastien, Petitjean, Patrick, Pichon, Christophe, Bergeron, Jacqueline
We use high spectral resolution (R=45000) and high signal-to-noise ratio (S/N \\~ 35-70 per pixel) spectra of 19 high-redshift (2.1
Metals in the Intergalactic Medium (2004)
Aracil, Bastien, Petitjean, Patrick, Pichon, Christophe, Bergeron, Jacqueline
We use high spectral resolution (R=45000) and high signal-to-noise ratio (S/N \\~ 35-70 per pixel) spectra of 19 high-redshift (2.1
Norman, Colin, Ptak, Andrew, Hornschemeier, Ann, Hasinger, Günther, Bergeron, Jacqueline, Comastri, Andrea, ...
Norman, Colin, Ptak, Andrew F., Hornschemeier, Ann, Hasinger, Gunther H., Bergeron, Jacqueline, Comastri, Andrea, ...
The cosmological star formation rate in the combined Chandra Deep Fields North and South is derived from our X-ray luminosity function for galaxies in these deep fields. Mild evolution is seen up to...
Norman, Colin, Ptak, Andrew F., Hornschemeier, Ann, Hasinger, Gunther H., Bergeron, Jacqueline, Comastri, Andrea, ...
The cosmological star formation rate in the combined Chandra Deep Fields North and South is derived from our X-ray luminosity function for galaxies in these deep fields. Mild evolution is seen up to...
The Clustering of Intergalactic Metals (2003)
Pichon, Christophe, Scannapieco, Evan, Aracil, Bastien, Petitjean, Patrick, Aubert, Dominique, Bergeron, Jacqueline, ...
We measure the spatial clustering of metals in the intergalactic medium from z = 1.7 to 3.0, as traced by 643 CIV and 104 SiIV N >= 10^12 cm^-2 absorption systems in 19 high signal-to-noise (40-80)...
Metals in the Intergalactic Medium (2003)
Aracil, Bastien, Petitjean, Patrick, Pichon, Christophe, Bergeron, Jacqueline
We use high spectral resolution (R=45000) and high signal-to-noise ratio (S/N \~ 35-70 per pixel) spectra of 19 high-redshift (2.1
Rao, Sandhya M., Nestor, Daniel B., Turnshek, David A., Lane, Wendy M., Monier, Eric M., Bergeron, Jacqueline
We present optical and near-infrared ground-based imaging results on four low-redshift damped Ly-alpha (DLA) galaxies. The corresponding DLA systems were discovered in our HST spectroscopic surveys...
The warm-hot intergalactic medium at z~2.2: Metal enrichment and ionization source (2002)
Bergeron, Jacqueline, Aracil, Bastien, Petitjean, Patrick, Pichon, Christophe
Results are presented for our search for warm-hot gas towards the quasar Q 0329-385. We identify ten OVI systems of which two are within 5000 km/s of z_em and a third one should be of intrinsic...
The Abundances of Nitrogen and Oxygen in Damped Lyman Alpha Systems (2002)
Pettini, Max, Ellison, Sara L., Bergeron, Jacqueline, Petitjean, Patrick
We take a fresh look at the abundance of nitrogen in DLAs with oxygen abundances between 1/10 and 1/100 of solar. This is a metallicity regime poorly sampled in the local universe and where QSO...
The warm-hot intergalactic medium at z~2.2: Metal enrichment and ionization source (2002)
Bergeron, Jacqueline, Aracil, Bastien, Petitjean, Patrick, Pichon, Christophe
Results are presented for our search for warm-hot gas towards the quasar Q 0329-385. We identify ten OVI systems of which two are within 5000 km/s of z_em and a third one should be of intrinsic...
The warm-hot intergalactic medium at z~2.2: Metal enrichment and ionization source (2002)
Bergeron, Jacqueline, Aracil, Bastien, Petitjean, Patrick, Pichon, Christophe
Results are presented for our search for warm-hot gas towards the quasar Q 0329-385. We identify ten OVI systems of which two are within 5000 km/s of z_em and a third one should be of intrinsic...
Resolving the hard x-ray background in the Chandra Deep Field South (2002)
Gilli, Roberto, Giacconi, Riccardo, Tozzi, Paolo, Rosati, Piero, Hasinger, Günther, Kewley, Lisa, ...
Properties of Low-Redshift Damped Lyman Alpha Galaxies (2001)
Nestor, Daniel B., Rao, Sandhya M., Turnshek, David A., Monier, Eric, Lane, Wendy, Bergeron, Jacqueline
Images of five QSO fields containing six damped Lyman alpha (DLA) systems at redshifts 0.09
Weymann, Ray J., Jannuzi, Buell T., Lu, Limin, Bahcall, John N., Bergeron, Jacqueline, Boksenberg, Alec, ...
We present an analysis of the evolution of the Ly alpha absorption lines in the redshift interval 0.0 to \sim 1.5 based upon a sample of 987 lines identified in the spectra of 63 QSOs obtained with...
Jannuzi, Buell T., Bahcall, John N., Bergeron, Jacqueline, Boksenberg, Alec, Hartig, George F., Kirhakos, Sofia, ...
We present a catalogue of absorption lines obtained from the analysis of the ultra-violet spectra of 66 quasars. The data were acquired with the Faint Object Spectrograph of the HST as part of the...
Are Damped Lyman alpha Systems Rotating Disks ? (1998)
Ledoux, Cedric, Petitjean, Patrick, Bergeron, Jacqueline
We report on high spectral resolution observations of five damped Lyman alpha systems whose line velocity profiles and abundances are analyzed. By combining these data with information from the...
A HST Spectroscopic study of QSOs with intermediate redshift damped Lyman-alpha systems (1998)
Boisse, Patrick, Brun, Vincent Le, Bergeron, Jacqueline, Deharveng, Jean-Michel
We present HST spectra for a sample of six QSOs with intermediate redshift (z_a < 1) damped Ly-alpha systems. These observations aim at measuring the HI column density and detect metal lines in order...
Evolution of quasar absorption-selected galaxies (1997)
Guillemin, Patrick, Bergeron, Jacqueline
We present the results of a survey of galaxies selected by their gas cross-section which give rise to MgII absorption lines in the spectra of background quasars. The sample comprises 11 galaxies...
The HST Quasar Absorption Line Key Project VII. Absorption Systems at $z_{\rm abs} \leq 1.3$ (1995)
Bahcall, John N., Bergeron, Jacqueline, Boksenberg, Alec, Hartig, George F., Jannuzi, Buell T., Kirhakos, Sofia, ...
We present evidence that clumps of \lya lines are physically associated with about half of the extensive metal-line systems (absorption systems with four or more observed metal-line species) found in...