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Title:
HI and OH absorption in the lensing galaxy of MG J0414+0534
Authors:
Curran, S. J.; Darling, J.; Bolatto, A. D.; Whiting, M. T.; Bignell, C.; Webb, J. K.
Affiliation:
AA(School of Physics, University of New South Wales, Sydney, NSW 2052, Australia), AB(Centre for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, 389 UCB, Boulder, CO 80309-0389, USA), AC(Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720, USA; Department of Astronomy and Laboratory for Millimeter-Wave Astronomy, University of Maryland, College Park, MD 20742, USA), AD(CSIRO Australia Telescope National Facility, PO Box 76, Epping, NSW 1710, Australia), AE(National Radio Astronomy Observatory, PO Box 2, Rt. 28/92 Green Bank, WV 24944-0002, USA), AF(School of Physics, University of New South Wales, Sydney, NSW 2052, Australia)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 382, Issue 1, pp. L11-L15. (MNRAS Homepage)
Publication Date:
11/2007
Origin:
MNRAS
MNRAS Keywords:
gravitational lensing, quasars: absorption lines, galaxies: individual: MG J0414+0534, galaxies: ISM, cosmology: observations, early Universe
DOI:
10.1111/j.1745-3933.2007.00379.x
Bibliographic Code:
2007MNRAS.382L..11C

Abstract

We report the detection of HI 21-cm absorption in the z = 0.96 early-type lensing galaxy towards MG J0414+0534 with the Green Bank Telescope. The absorption, with total NHI = 1.6 × 1018 (Ts/f)cm-2, is resolved into two strong components, probably due to the two strongest lens components, which are separated by 0.4 arcsec. Unlike the other three lenses that have been detected in HI, J0414+0534 does not exhibit strong OH absorption, giving an OH/HI column density ratio of NOH/NHI <~ 10-6 (for Ts = 100 K, Tx = 10 K and fHI = fOH = 1). This underabundance of molecular gas may indicate that the extreme optical-near-infrared colour (V - K = 10.26) along the line of sight is not due to the lens. We therefore suggest that despite the strong upper limits on molecular absorption at the quasar redshift, as traced by millimetre lines, the extinction occurs primarily in the quasar host galaxy.
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