6 papers
High-S/N Quasar Observations with HST/COS: Deep Fields for Spectroscopy
Andrew J. Fox, Jerry Kriss, Philipp Richter +49
Hubble is still in prime observing condition for making transformative discoveries in UV astronomy. In this white paper we describe the science case for a deep (S/N>30) UV spectros…
Investigating the Circumgalactic Medium through Mg II absorption coincidence
Paryag Sharma, Raghunathan Srianand, Hum Chand +1
We present a statistical measurement of the transverse coherence of Mg II absorption using a large sample of 9204 absorber-centric quasar sightline pairs from…
Circumgalactic medium of quasar host galaxies at 0.4<z<0.8 probed by strong Mg II absorption
Paryag Sharma, Raghunathan Srianand, Hum Chand +1
Using a sample of 166 projected quasar pairs we investigate the influence of active galactic nuclei on the circumgalactic medium (CGM) of the quasar host galaxies probed using stro…
Cosmic Chance Superpositions: Largest Catalog of Quasar-Galaxy Pairs at a Projected Separation of kpc
Labanya Kumar Guha, Raghunathan Srianand, Rajeshwari Dutta
We present the largest catalogue to date of Galaxies On Top Of Quasars (GOTOQs), systems where the sightline to a background quasar passes directly through or very close to a foreg…
HI 21-cm Absorption Associated with Foreground Galaxies on Top of Quasars
Labanya Kumar Guha, Raghunathan Srianand, Rajeshwari Dutta
A systematic search for HI 21-cm absorption in Quasar-Galaxy Pairs (QGPs) provides a powerful means to map the distribution of cold gas around high-redshift star-forming galaxies.…
Quasar radiation transforms the gas in a merging companion galaxy
Sergei Balashev, Pasquier Noterdaeme, Neeraj Gupta +7
Quasars, powered by gas accretion onto supermassive black holes, rank among the most energetic objects of the Universe. While they are thought to be ignited by galaxy mergers and a…