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  Molecular Emission from a Galaxy Associated with a z ̃ 2.2 Damped Lyα Absorber

Neeleman, M., Kanekar, N., Prochaska, J. X., Christensen, L., Dessauges-Zavadsky, M., Fynbo, J. P. U., et al. (2018). Molecular Emission from a Galaxy Associated with a z ̃ 2.2 Damped Lyα Absorber. The Astrophysical Journal, 856.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CBFA-D Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CBFB-C
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018ApJ...856L..12N (Any fulltext)
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 Creators:
Neeleman, Marcel1, Author
Kanekar, Nissim1, Author
Prochaska, J. Xavier1, Author
Christensen, Lise1, Author
Dessauges-Zavadsky, Miroslava1, Author
Fynbo, Johan P. U.1, Author
Møller, Palle1, Author
Zwaan, Martin A.1, Author
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1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: high-redshift galaxies: ISM galaxies: kinematics and dynamics quasars: absorption lines submillimeter: galaxies Astrophysics - Astrophysics of Galaxies
 Abstract: Using the Atacama Large Millimeter/submillimeter Array, we have detected CO(3-2) line and far-infrared continuum emission from a galaxy associated with a high-metallicity ([M/H] = -0.27) damped Lyα absorber (DLA) at z DLA = 2.19289. The galaxy is located 3.″5 away from the quasar sightline, corresponding to a large impact parameter of 30 kpc at the DLA redshift. We use archival Very Large Telescope-SINFONI data to detect Hα emission from the associated galaxy, and find that the object is dusty, with a dust-corrected star formation rate of {110}-30+60 M☉ yr-1. The galaxy’s molecular mass is large, Mmol = (1.4 ± 0.2) × 1011 × (α CO/4.3) × (0.57/r 31) M ☉, supporting the hypothesis that high-metallicity DLAs arise predominantly near massive galaxies. The excellent agreement in redshift between the CO(3-2) line emission and low-ion metal absorption (̃40 km s-1) disfavors scenarios whereby the gas probed by the DLA shows bulk motion around the galaxy. We use Giant Metrewave Radio Telescope H I 21 cm absorption spectroscopy to find that the H I along the DLA sightline must be warm, with a stringent lower limit on the spin temperature of T s > 1895 × (f/0.93) K. The detection of C I absorption in the DLA, however, also indicates the presence of cold neutral gas. To reconcile these results requires that the cold components in the DLA contribute little to the H I column density, yet contain roughly 50% of the metals of the absorber, underlining the complex multi-phase nature of the gas surrounding high-z galaxies.

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 Dates: 2018
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 856 Sequence Number: - Start / End Page: - Identifier: -