112 citations · 1.8k across the 47 of their papers we have counts for
17 papers · 1 filter
Three- and two-point spatial correlations of intergalactic medium at using projected quasar triplets
Soumak Maitra, Raghunathan Srianand, Patrick Petitjean +4
We present analysis of two- and three-point correlation functions of Ly forest (at ) using X-Shooter spectra of three background quasar triplets probing transvers…
WEAVE-QSO: A Massive Intergalactic Medium Survey for the William Herschel Telescope
M. M. Pieri, S. Bonoli, J. Chaves-Montero +12
In these proceedings we describe the WEAVE-QSO survey, which will observe around 400,000 high redshift quasars starting in 2018. This survey is part of a broader WEAVE survey to be…
The Galaxy Population In Voids: Are All Voids The Same?
Saeed Tavasoli, Hadi Rahmani, Habib G. Khosroshahi +2
The influence of under-dense environments on the formation and evolution of galaxies is studied by analysing the photometric properties of ~200 galaxies residing in voids, taken fr…
The UVES Large Program for testing fundamental physics - III. Constraints on the fine-structure constant from 3 telescopes
T. M. Evans, M. T. Murphy, J. B. Whitmore +10
Large statistical samples of quasar spectra have previously indicated possible cosmological variations in the fine-structure constant, . A smaller sample of higher signal-to-noi…
The star-formation history of mass-selected galaxies from the VIDEO survey
Jonathan T. L. Zwart, Matt J. Jarvis, Roger P. Deane +5
We measure star-formation rates (SFRs) and specific SFRs (SSFRs) of Ks-selected galaxies from the VIDEO survey by stacking 1.4-GHz Very Large Array data. We split the sample, which…
Constraining the Variation in Fine-Structure Constant Using SDSS DR8 QSO Spectra
H. Rahmani, N. Maheshwari, R. Srianand
We report a robust constrain on the possible variation of fine-structure constant, alpha = e^2/(hbar*c), obtained using O III 4959,5007, nebular emission lines from QSOs. We find D…
Molecular hydrogen in the z = 2.66 damped Lyman-alpha absorber toward Q J0643-5041
D. Albornoz Vásquez, H. Rahmani, P. Noterdaeme +3
We use high signal-to-noise ratio, high-resolution VLT-UVES data of Q J0643-5041 amounting to a total of more than 23 hours exposure time and fit the neutral hydrogen, metals and H…
Fundamental constants and high resolution spectroscopy
P. Bonifacio, H. Rahmani, J. B. Whitmore +14
Absorption-line systems detected in high resolution quasar spectra can be used to compare the value of dimensionless fundamental constants such as the fine-structure constant, alph…
An investigation of the line of sight towards QSO PKS 0237-233
H. Fathivavsari, P. Petitjean, C. Ledoux +4
We present a detailed analysis of absorption systems along the line of sight towards QSO PKS 0237-233 using a high resolution spectrum of signal-to-noise ratio (SNR) ~ 60-80 obtain…
The UVES Large Program for Testing Fundamental Physics II: Constraints on a Change in μ Towards Quasar HE 0027-1836
H. Rahmani, M. Wendt, R. Srianand +14
We present an accurate analysis of the H2 absorption lines from the zabs ~ 2.4018 damped Lyα system towards HE 0027-1836 observed with the Very Large Telescope Ultraviolet and Visu…
The UVES Large Program for Testing Fundamental Physics: I Bounds on a change in alpha towards quasar HE 2217-2818
P. Molaro, M. Centurion, J. B. Whitmore +14
Absorption line systems detected in quasar spectra can be used to compare the value of the fine-structure constant, α, measured today on Earth with its value in distant galaxies. I…
Parsec-scale structures and diffuse bands in a translucent interstellar medium at z 0.079
R. Srianand, N. Gupta, H. Rahmani +3
We present a detailed study of the QSO-galaxy pair [SDSS J163956.35+112758.7 (zq = 0.993) and SDSS J163956.38+112802.1 (zg = 0.079)] based on observations carried out using the Gia…
Constraining the variation of fundamental constants at z ~ 1.3 using 21-cm absorbers
H. Rahmani, R. Srianand, N. Gupta +3
We present high resolution optical spectra obtained with the Ultraviolet and Visual Echelle Spectrograph (UVES) at the Very Large Telescope (VLT) and 21-cm absorption spectra obtai…
Metallicities, dust and molecular content of a QSO-Damped Lyman-α system reaching log N (H i) = 22: An analog to GRB-DLAs
R. Guimarães, P. Noterdaeme, P. Petitjean +4
We present the elemental abundance and H2 content measurements of a Damped Lyman-α (DLA) system with an extremely large H i column density, log N(H i) (cm-2) = 22.0+/-0.10, at zabs…
A statistical study of the luminosity gap in galaxy groups
Saeed Tavasoli, Habib G. Khosroshahi, Ali Koohpaee +2
The luminosity gap between the two brightest members of galaxy groups and clusters is thought to offer a strong test for the models of galaxy formation and evolution. This study fo…
The Lyman-alpha emission of high-z damped Lyman-alpha systems
H. Rahmani, R. Srianand, P. Noterdaeme +1
Using a spectral stacking technique we searched for the average \lya emission from high-z Damped \lya (DLA) galaxies detected in the Sloan Digital Sky Survey QSO spectra. We used a…
The Spatial Distribution Function of Galaxies at High Redshift
Hadi Rahmani, William C. Saslaw, Saeed Tavasoli
This is the first exploration of the galaxy distribution function at redshifts greater than about 0.1. Redshifts are based on the North and South GOODS Catalogs. In each catalog we…