Characterizing the circum-galactic medium of damped Lyman-α absorbing galaxies
| Autor: | Varsha P. Kulkarni, Ramona Augustin, Palle Møller, Martin Zwaan, Matthew M. Pieri, Giovanni Vladilo, B. Milliard, Celine Peroux, Monique C. Aller, Donald G. York, Hadi Rahmani |
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| Přispěvatelé: | Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), ITA, USA |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences 0103 physical sciences High spatial resolution Emission spectrum 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics [PHYS]Physics [physics] 010308 nuclear & particles physics Star formation Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Baryon quasars: absorption lines Bias effect Space and Planetary Science Content (measure theory) galaxies: stellar content Spectral energy distribution galaxies: structure Astrophysics::Earth and Planetary Astrophysics galaxies: evolution [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2018, 478 (3), pp.3120-3132. ⟨10.1093/mnras/sty1287⟩ Monthly Notices of the Royal Astronomical Society, 2018, 478 (3), pp.3120-3132. ⟨10.1093/mnras/sty1287⟩ |
| ISSN: | 0035-8711 1365-2966 |
| Popis: | Gas flows in and out of galaxies through their circumgalactic medium (CGM) are poorly constrained and direct observations of this faint, diffuse medium remain challenging. We use a sample of five $z$ $\sim$ 1-2 galaxy counterparts to Damped Lyman-$\alpha$ Absorbers (DLAs) to combine data on cold gas, metals and stellar content of the same galaxies. We present new HST/WFC3 imaging of these fields in 3-5 broadband filters and characterise 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($M_*$/$\text{M}_{\odot}$) $\sim$ 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 percent. Similarly, we find gas fractions between 3 and 56 percent. 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 $N$(HI), 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($M_{\rm mol}$/$\text{M}_{\odot}$) < 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 in the structural complexity of the CGM. Comment: 15 pages, 9 figures, 5 tables, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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