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http://hdl.handle.net/20.500.12386/30785
Titolo: | Characterizing the circum-galactic medium of damped Lyman-α absorbing galaxies | Autori: | Augustin, Ramona Péroux, Céline Møller, Palle Kulkarni, Varsha Rahmani, Hadi Milliard, Bruno Pieri, Matthew York, Donald G. VLADILO, Giovanni Aller, Monique Zwaan, Martin |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 478 | Fascicolo: | 3 | Da pagina:: | 3120 | Abstract: | Gas flows in and out of galaxies through their circum-galactic medium (CGM) are poorly constrained and direct observations of this faint, diffuse medium remain challenging. We use a sample of five z ∼ 1-2 galaxy counterparts to damped Lyman-α absorbers (DLAs) to combine data on cold gas, metals and stellar content of the same galaxies. We present new Hubble Space Telescope (HST)/WFC3 imaging of these fields in three to five broad-band filters and characterize the stellar properties of the host galaxies. By fitting the spectral energy distribution, we measure their stellar masses to be in the range of log(M<SUB>*</SUB>/M<SUB>☉</SUB>) ∼ 9.1-10.7. Combining these with IFU observations, we find a large spread of baryon fractions inside the host galaxies, between 7 and 100 per cent. Similarly, we find gas fractions between 3 and 56 per cent. Given their star formation rates, these objects lie on the expected main sequence of galaxies. Emission line metallicities indicate they are consistent with the mass-metallicity relation for DLAs. We also report an apparent anti-correlation between the stellar masses and N(H I), which could be due to a dust bias effect or lower column density systems tracing more massive galaxies. We present new ALMA observations of one of the targets leading to a molecular gas mass of log(M<SUB>mol</SUB>/M<SUB>☉</SUB>) < 9.89. We also investigate the morphology of the DLA counterparts and find that most of the galaxies show a clumpy structure and suggest ongoing tidal interaction. Thanks to our high spatial resolution HST data, we gain new insights into the structural complexity of the CGM. | URI: | http://hdl.handle.net/20.500.12386/30785 | URL: | https://academic.oup.com/mnras/article/478/3/3120/4998868 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty1287 | Bibcode ADS: | 2018MNRAS.478.3120A | Fulltext: | open |
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