- This paper presents a study of the galactic environment of a chemically pristine (<0.6 per cent solar metallicity) Lyman Limit system (LLS) discovered along the sightline towards QSO SDSSJ 135726.27+043541.4 (Z(QSO) = 1.233) at projected distance d = 126 physical kpc (pkpc) from a luminous red galaxy (LRG) at z = 0.33. Combining deep Hubble Space Telescope images, MUSE integral field spectroscopic data, and wide-field redshift survey data has enabled an unprecedented, ultradeep view of the environment around this LRG-LLS pair. A total of 12 galaxies, including the LRG, are found at d less than or similar to 400 pkpc and line-of-sight velocity Delta v < 600 km S-1 of the LLS, with intrinsic luminosity ranging from 0.001 L-* to 2 L-* and a corresponding stellar mass range of M-star approximate to 10(7-11) M-circle dot. All 12 galaxies contribute to a total mass of M-star = 1.6 x 10(11) M-circle dot with approximate to 80 per cent contained in the LRG. The line-of-sight velocity dispersion of these galaxies is found to be sigma (group) =This paper presents a study of the galactic environment of a chemically pristine (<0.6 per cent solar metallicity) Lyman Limit system (LLS) discovered along the sightline towards QSO SDSSJ 135726.27+043541.4 (Z(QSO) = 1.233) at projected distance d = 126 physical kpc (pkpc) from a luminous red galaxy (LRG) at z = 0.33. Combining deep Hubble Space Telescope images, MUSE integral field spectroscopic data, and wide-field redshift survey data has enabled an unprecedented, ultradeep view of the environment around this LRG-LLS pair. A total of 12 galaxies, including the LRG, are found at d less than or similar to 400 pkpc and line-of-sight velocity Delta v < 600 km S-1 of the LLS, with intrinsic luminosity ranging from 0.001 L-* to 2 L-* and a corresponding stellar mass range of M-star approximate to 10(7-11) M-circle dot. All 12 galaxies contribute to a total mass of M-star = 1.6 x 10(11) M-circle dot with approximate to 80 per cent contained in the LRG. The line-of-sight velocity dispersion of these galaxies is found to be sigma (group) = 230 km s(-1) with the centre of mass at d(group) = 118 pkpc and line-of-sight velocity offset of Delta v(group) = 181 km s(-1) from the LLS. Three of these are located at d less than or similar to 100 pkpc from the LLS, and they are all faint with intrinsic luminosity less than or similar to 0.02 L-* and gas-phase metallicity of approximate to 10 per cent solar in their interstellar medium. The disparity in the chemical enrichment level between the LLS and the group members suggests that the LLS originates in infalling intergalactic medium and that parts of the intergalactic gas near old and massive galaxies can still remain chemically pristine through the not too distant past.…
MetadatenAuthor details: | Hsiao-Wen ChenORCiD, Sean D. Johnson, Lorrie A. Straka, Fakhri S. ZahedyORCiD, Joop SchayeORCiD, Sowgat MuzahidORCiD, Nicolas Bouche, Sebastiano CantalupoORCiD, Raffaella Anna MarinoORCiD, Martin WendtORCiDGND |
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DOI: | https://doi.org/10.1093/mnras/sty3513 |
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ISSN: | 0035-8711 |
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ISSN: | 1365-2966 |
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Title of parent work (English): | Monthly notices of the Royal Astronomical Society |
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Subtitle (English): | the galactic environment of a chemically pristine Lyman limit absorber |
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Publisher: | Oxford Univ. Press |
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Place of publishing: | Oxford |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2019/12/28 |
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Publication year: | 2019 |
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Release date: | 2021/03/23 |
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Tag: | galaxies: elliptical and lenticular, cD; galaxies: formation; intergalactic medium; quasars: absorption lines |
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Volume: | 484 |
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Issue: | 1 |
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Number of pages: | 11 |
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First page: | 431 |
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Last Page: | 441 |
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Funding institution: | NASA Hubble FellowshipNational Aeronautics & Space Administration (NASA) [HST-HF2-51375.001-A]; Swiss National Science FoundationSwiss National Science Foundation (SNSF) [PP00P2_163824]; Paranal Observatory [095. A-0200(A)]; NASANational Aeronautics & Space Administration (NASA) [NAS 5-26555]; [HST-GO-14145.01A]; [NSFAST-1715692] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Peer review: | Referiert |
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Publishing method: | Open Access / Green Open-Access |
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