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Multiple Absorption Systems in the Lines of Sight to Quadruply Lensed Quasar H1413+1143 As a Probe of the Circumgalactic medium around Dwarf Galaxy

Published online by Cambridge University Press:  30 October 2019

Katsuya Okoshi ,
Yosuke Minowa ,
Nobunari Kashikawa ,
Suzuka Koyamada  and
Toru Misawa
Katsuya Okoshi
Affiliation:
Tokyo University of Science, Oshamambe, Hokkaido, 049-3514, Japan email: okoshi@rs.kagu.tus.ac.jp
Yosuke Minowa
Affiliation:
Subaru Telescope, National Astronomical Observatory of Japan, 650 North A’ohoku Place Hilo, HI 96720, U.S.A
Nobunari Kashikawa
Affiliation:
Department of Astronomy, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Suzuka Koyamada
Affiliation:
Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo, 407-2, Nishigaichi, Sayo-cho, Sayo, Hyogo, 679-5313
Toru Misawa
Affiliation:
Department of Physics, Faculty of Science, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano 390-8621Japan
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Abstract

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We present the first measurement of differences in MgII absorption strength in multiple intervening absorbers, which are also identified as (sub-)Damped Lyman alpha absorption systems, in the four spectra of the quadruply lensed quasar H1413+1143, often referred to the “Cloverleaf”, from highly spatial resolution and high signal-to-noise spectroscopy with an optical multi-mode spectrograph, the Kyoto tridimentional spectrograph II on board the Subaru telescope. The detection of significant MgII absorptions in multiple components in the spatially-resolved spectra suggests that chemical enrichment differs at least on scale of about 10 kpc within the separation of sightlines. For, a DLA system at redshift zabs = 1.66, the rest equivalent widths of MgII absorption lines change by factors up to 6, which is similar to those of HI absorption lines. This suggests that (inhomogeneous) cold absorbers which give rise to strong HI/MgII absorptions dwell on a scale within 10 kpc in the circumgalactic medium (CGM).

Keywords

galaxies: evolutionintergalactic mediumquasars: absorption lines
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 305 - 308
Copyright
© International Astronomical Union 2019 

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