Outflowing atomic and molecular gas at z ~ 0.67 towards 1504 + 377

Kanekar, Nissim ; Chengalur, Jayaram N. (2008) Outflowing atomic and molecular gas at z ~ 0.67 towards 1504 + 377 Monthly Notices of the Royal Astronomical Society: Letters, 384 (1). L6-L10. ISSN 1745-3925

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1745-...

Related URL: http://dx.doi.org/10.1111/j.1745-3933.2007.00410.x

Abstract

We report the detection of OH 1667-MHz and wide H I 21-cm absorption at z˜ 0.67 towards the red quasar 1504 + 377, with the Green Bank Telescope and the Giant Metrewave Radio Telescope. The H I 21-cm absorption extends over a velocity range of ~600 km s−1 blueward of the quasar redshift (z= 0.674), with the new OH 1667-MHz absorption component at ~ −430 km s−1, nearly coincident with earlier detections of millimetre-wave absorption at z~ 0.6715. The atomic and molecular absorption appear to arise from a fast gas outflow from the quasar, with a mass outflow rate M ~ 12Myr−1and a molecular hydrogen fraction fH2 = (NH2/NHI) ~0.2. The radio structure of 1504 + 377 is consistent with the outflow arising as a result of a jet-cloud interaction, followed by rapid cooling of the cloud material. The observed ratio of HCO+ and OH column densities is ~20 times higher than typical values in Galactic and high-z absorbers. This could arise because of small-scale structure in the outflowing gas on sub-parsec scales, which would also explain the observed variability in the H I 21-cm line.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Galaxies: ISM; Quasars: Absorption Lines; Quasars: Individual: 1504+377
ID Code:63586
Deposited On:29 Sep 2011 04:09
Last Modified:29 Sep 2011 04:09

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