Tejos, Nicolas, Lopez, Sebastian, Prochaska, J. Xavier, Bloom, Joshua S., Chen, Hsiao-Wen, Dessauges-Zavadsky, Miroslava, ...
We revisit echelle spectra (spectral resolution R ~ 40000) of 8 Gamma-Ray Burst afterglows to obtain the incidence (dN/dz) of weak intervening Mg II systems at a mean redshift of = 1.5. We show that...
Revisiting the origin of the high metallicities of sub-damped Lyman-alpha systems (2009)
Dessauges-Zavadsky, Miroslava, Ellison, Sara L., Murphy, Michael T.
Sub-damped Lyman-alpha systems (sub-DLAs) have previously been found to exhibit a steeper metallicity evolution than the classical damped Lyman-alpha systems (DLAs), evolving to close to solar...
Ellison, Sara L., Murphy, Michael T., Dessauges-Zavadsky, Miroslava
Using a sample of 21 damped Lyman alpha systems (DLAs) and 35 sub-DLAs, we evaluate the D-index from high-resolution spectra of the Mg ii λ 2796 profile. This sample represents an increase in...
Revisiting the origin of the high metallicities of sub-damped Lyman-alpha systems (2009)
Dessauges-Zavadsky, Miroslava, Ellison, Sara L., Murphy, Michael T.
Sub-damped Lyman-alpha systems (sub-DLAs) have previously been found to exhibit a steeper metallicity evolution than the classical damped Lyman-alpha systems (DLAs), evolving to close to solar...
Ellison, Sara L., Murphy, Michael T., Dessauges-Zavadsky, Miroslava
Using a sample of 21 damped Lyman alpha systems (DLAs) and 35 sub-DLAs, we evaluate the D-index from high-resolution spectra of the Mg ii λ 2796 profile. This sample represents an increase in...
Revisiting the origin of the high metallicities of sub-damped Lyman-alpha systems (2009)
Dessauges-Zavadsky, Miroslava, Ellison, Sara L., Murphy, Michael T.
Sub-damped Lyman-alpha systems (sub-DLAs) have previously been found to exhibit a steeper metallicity evolution than the classical damped Lyman-alpha systems (DLAs), evolving to close to solar...
Ellison, Sara L., Murphy, Michael T., Dessauges-Zavadsky, Miroslava
Using a sample of 21 damped Lyman alpha systems (DLAs) and 35 sub-DLAs, we evaluate the D-index = EW / Delta v x 1000 from high resolution spectra of the MgII lambda 2796 profile. This sample...
Strong magnetic fields in normal galaxies at high redshifts (2008)
Bernet, Martin L., Miniati, Francesco, Lilly, Simon J., Kronberg, Philipp P., Dessauges-Zavadsky, Miroslava
The origin and growth of magnetic fields in galaxies is still something of an enigma. It is generally assumed that seed fields are amplified over time through the dynamo effect, but there are few...
Prochaska, Jason X., Dessauges-Zavadsky, Miroslava, Ramirez-Ruiz, Enrico, Chen, Hsiao-Wen
We survey NV absorption in the afterglow spectra of long-duration gamma-ray bursts (GRBs) with the intent to study highly ionized gas in the galaxies hosting these events. We identify a high...
Resolving The ISM Surrounding GRBs with Afterglow Spectroscopy (2008)
Prochaska, Jason X., Chen, Hsiao-Wen, Dessauges-Zavadsky, Miroslava, Bloom, Joshua S.
We review current research related to spectroscopy of gamma-ray burst (GRB) afterglows with particular emphasis on the interstellar medium (ISM) of the galaxies hosting these high redshift events....
Fynbo, Johan P. U., Prochaska, J. Xavier, Sommer-Larsen, Jesper, Dessauges-Zavadsky, Miroslava, Moller, Palle
We test the hypothesis that the host galaxies of long-duration gamma-ray bursts (GRBs) as well as quasar-selected damped Lyman-alpha (DLA) systems are drawn from the population of UV-selected...
The contribution of UVES@VLT to the new era of QSO absorption line studies (2007)
D'Odorico, Valentina, Dessauges-Zavadsky, Miroslava
We briefly review the main results obtained in the field of QSO absorption line studies with the UVES high resolution spectrograph mounted on the Kueyen unit of the ESO Very Large Telescope (Paranal,...
THE ASTROPHYSICAL JOURNAL, 565 696719, 2002 February 1 (2007)
The American Astronomical, Sergei A. Levshakov, Miroslava Dessauges-zavadsky, Sandro Dodorico, Paolo Molaro
We have detected in high-resolution spectra of the quasar Q0347[3819 obtained with the UV-Visual Echelle Spectrograph (UVES) at the VLT/Kueyen telescope over 80 absorption features in the Lyman and...
A Homogeneous Sample of Sub-DLAs IV: Global Metallicity Evolution (2007)
Peroux, Celine, Dessauges-Zavadsky, Miroslava, D'Odorico, Sandro, Kim, Tae-Sun, McMahon, Richard G.
An accurate method to measure the abundance of high-redshift galaxies consists in the observation of absorbers along the line of sight toward a background quasar. Here, we present abundance...
On the Incidence of C IV Absorbers Along the Sightlines to Gamma-Ray Bursts (2007)
Tejos, Nicolas, Lopez, Sebastian, Prochaska, Jason X., Chen, Hsiao-Wen, Dessauges-Zavadsky, Miroslava
We report on the statistics of strong (W_r > 0.15 A) C IV absorbers at z=1.5-3.5 toward high-redshift gamma-ray bursts (GRBs). In contrast with a recent survey for strong Mg II absorption systems at...
On the Nature of Velocity Fields in High z Galaxies (2007)
Prochaska, Jason X., Chen, Hsiao-Wen, Wolfe, Arthur M., Dessauges-Zavadsky, Miroslava, Bloom, Joshua S.
We analyze the gas kinematics of damped Lya systems (DLAs) hosting high z gamma-ray bursts (GRBs) and those toward quasars (QSO-DLAs) focusing on threestatistics: (1) dv, the velocity interval...
Prochaska, Jason X., Chen, Hsiao-Wen, Dessauges-Zavadsky, Miroslava, Bloom, Joshua S.
We study the chemical abundances of the interstellar medium surrounding high z gamma-ray bursts (GRBs) through analysis of the damped Lya systems (DLAs) identified in afterglow spectra. These...
Missing Molecular Hydrogen and the Physical Conditions of GRB Host Galaxies (2007)
Tumlinson, Jason, Prochaska, Jason X., Chen, Hsiao-Wen, Dessauges-Zavadsky, Miroslava, Bloom, Joshua S.
We examine the abundance of molecular hydrogen (H2) in the spectra of gamma ray burst afterglows (GRBs). In nearby galaxies H2 traces the cold neutral medium (CNM) and dense molecular star-forming...
Chen, Hsiao-Wen, Prochaska, Jason X., Ramirez-Ruiz, Enrico, Bloom, Joshua S., Dessauges-Zavadsky, Miroslava, Foley, Ryan J.
We investigate available constraints on the circumstellar medium (CSM) around long-duration gamma-ray burst (GRB) progenitors from afterglow spectra. We first establish a statistical sample of five...
On the incidence of strong MgII absorbers along gamma-ray burst sight lines (2006)
Prochter, Gabriel E., Prochaska, Jason X., Chen, Hsiao-Wen, Bloom, Joshua S., Dessauges-Zavadsky, Miroslava, Foley, Ryan J., ...
We report on a survey for strong ( rest equivalent width W-r >= 1 angstrom) intervening Mg II systems along the sight lines to long-duration gamma-ray bursts (GRBs). The GRB spectra that comprise the...
The Metal-Strong Damped Lyman-alpha Systems (2006)
Herbert-Fort, Stéphane, Prochaska, Jason X., Dessauges-Zavadsky, Miroslava, Ellison, Sara L., Howk, J. Chris, Wolfe, Arthur M., ...
We have identified a metal-strong (logN(Zn+) > 13.15 or logN(Si+) > 15.95) DLA (MSDLA) population from an automated quasar (QSO) absorber search in the Sloan Digital Sky Survey Data Release 3...
Temporal Variation in Excited Fe^+ Near a GRB Afterglow (2006)
Dessauges-Zavadsky, Miroslava, Chen, Hsiao-Wen, Prochaska, Jason X., Bloom, Joshua S., Barth, Aaron J.
Excited Si^+ and Fe^+ species are routinely observed in the host environment of gamma-ray burst (GRB) afterglows, but are not commonly seen in other extragalactic locations. Their presence signals...
A Homogeneous Sample of Sub-DLAs III: Total Gas Mass Omega_(HI+HeII) at z>2 (2005)
Peroux, Celine, Dessauges-Zavadsky, Miroslava, D'Odorico, Sandro, Kim, Tae Sun, McMahon, Richard G.
Absorbers seen in the spectrum of background quasars are a unique tool to select HI-rich galaxies at all redshifts. In turns, these allow to determine the cosmological evolution of the HI gas,...
A Homogeneous Sample of Sub-DLAs II: Statistical, Kinematic and Chemical Properties (2003)
Peroux, Celine, Dessauges-Zavadsky, Miroslava, D'Odorico, Sandro, Kim, Tae Sun, McMahon, Richard G.
Damped Ly-alpha Systems (DLAs), with N(HI)>2*10^20 cm^{-2}, observed in quasars have allowed us to quantify the chemical content of the Universe over cosmological scales. Such studies can be extended...
Chemical abundances in DLAs and the distant Universe / (2003)
Dessauges-Zavadsky, Miroslava.
Enthält versch. Sonderdr.
A new deuterium abundance measurement from a damped Ly-alpha system at z_abs = 3.025 (2001)
D'Odorico, Sandro, Dessauges-Zavadsky, Miroslava, Molaro, Paolo
We present the first D/H measurement in a damped Ly-alpha system at z_abs = 3.025 towards QSO 0347-3819 obtained from the UVES-VLT spectra. The DLA absorber has a metallicity of [Zn/H] = -1.25 and a...