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The evolution of the Cosmic Microwave Background Temperature: Measurements of TCMB at high redshift from carbon monoxide excitation
P. Noterdaeme, P. Petitjean, R. Srianand +2
A milestone of modern cosmology was the prediction and serendipitous discovery of the Cosmic Microwave Background (CMB), the radiation left over after decoupling from matter in the…
Variability selected high-redshift quasars on SDSS Stripe 82
N. Palanque-Delabrouille, Ch. Yeche, A. D. Myers +11
The SDSS-III BOSS Quasar survey will attempt to observe z>2.15 quasars at a density of at least 15 per square degree to yield the first measurement of the Baryon Acoustic Oscillati…
Revisiting the He II to H I ratio in the Intergalactic Medium
Sowgat Muzahid, Raghunathan Srianand, Patrick Petitjean
We estimate the He II to H I column density ratio, η= N(He II)/N(H I), in the intergalactic medium towards the high redshift (z_{em} = 2.885) bright quasar QSO HE 2347-4342 using V…
The VLT LBG Redshift Survey I: Clustering and Dynamics of ~1000 Galaxies at z~3
Rich Bielby, T. Shanks, P. M. Weilbacher +11
We present the initial imaging and spectroscopic data acquired as part of the VLT VIMOS Lyman-break galaxy Survey. UBR (or UBVI) imaging covers five 36'x36' fields centred on brigh…
Detection of 21-cm, H2 and Deuterium absorption at z>3 along the line-of-sight to J1337+3152
R. Srianand, N. Gupta, P. Petitjean +2
We report the detection of 21-cm and H2 absorption lines in the same DLA system (log N(HI)=21.36+-0.10) at zabs=3.17447 towards SDSSJ133724+315254 (z=3.174). We estimate the spin t…
HD molecules at high redshift: The absorption system at z=2.3377 towards Q 1232+082
A. V. Ivanchik, P. Petitjean, S. A. Balashev +4
We present a detailed analysis of the H_2 and HD absorption lines detected in the Damped Lyman-alpha (DLA) system at z_abs=2.3377 towards the quasar Q1232+082. We show that this in…