activity
20092019
most citedDiscovery of a Perseus-like cloud in the early Universe: HI-to-H2 transition, carbon monoxide and small dust grains at zabs=2.53 towards the quasar J0000+0048

79 citations · 333 across the 11 of their papers we have counts for

collaborators
Showing astro-ph.COShow all

3 papers · 1 filter

astro-ph.CO2012★ 50 cited

Search for cold gas in strong MgII absorbers at 0.5<z<1.5: nature and evolution of 21-cm absorbers

N. Gupta, R. Srianand, P. Petitjean +3

We report 4 new detections of 21-cm absorption from a systematic search of 21-cm absorption in a sample of 17 strong (Wr(MgII 2796)>1A) intervening MgII absorbers at 0.5<z<1.5. We…

astro-ph.CO2010★ 51 cited

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…

astro-ph.CO2009

21-cm absorbers at intermediate redshifts

N. Gupta, R. Srianand, P. Petitjean +2

Damped Lyman-alpha systems (DLAs) seen in the spectra of high-z QSOs allow us to probe the physical conditions in protogalaxies. Our understanding of physical conditions in DLAs at…