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Title: uGMRT search for cold gas at z ∼ 1–1.4 towards red quasars

Journal Article · · Monthly Notices of the Royal Astronomical Society
ORCiD logo [1];  [2];  [2];  [3]
  1. European Southern Observatory, Karl-Schwarzschild-Str 2, Garching Near Munich D-85748, Germany
  2. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007, India
  3. Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China
+ Show Author Affiliations

ABSTRACT We present results from our search for H i 21-cm and OH 18-cm absorption at z ∼ 1–1.4 towards red quasars showing strong Mg ii absorption using upgraded Giant Metrewave Radio Telescope. The quasars J1501 + 1822 and J1521 + 5508 show multiple strong associated Mg ii absorption at z ∼ 1.1 and signature of reddening in their optical spectra. We report the detection of H i 21-cm absorption towards J1521 + 5508 at the systemic redshift of the quasar, with $$N(\rm{H\,{\small I}}$$) = (1.2 ± 0.2) × 1020 cm−2 for spin temperature of 100 K and unit covering factor. The H i 21-cm absorption is offset from the blueshifted strong Mg ii absorbers by ≳1500 km s−1. We do not detect H i 21-cm absorption at the redshift of the associated Mg ii absorption and at the systemic redshift towards J1501 + 1822. We argue that lack of one-to-one correspondence between Mg ii and H i 21-cm absorption could be related with clumpiness of the neutral gas and the radio and optical sightlines probing different volume of the gas. We find that the presence of strong associated Mg ii absorption and reddening in the optical spectra of the quasars lead to an increased detection rate of associated H i 21-cm absorption at z ≥1. We also report non-detection of intervening OH absorption ([OH]/[H i] ≤ (1–4)× 10−8) at z  = 1.3 towards two red quasars, J0850 + 5159 and J0852 + 3435, which show strong metal and H i 21-cm absorption and the 2175 Å dust extinction bump.

Sponsoring Organization:
USDOE
OSTI ID:
1701788
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 491; ISSN 0035-8711
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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