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Title: Solar-metallicity gas in the extended halo of a galaxy at z ∼ 0.12

Abstract

ABSTRACT We present the detection and analysis of a weak low-ionization absorber at z = 0.121 22 along the sightline of the blazar PG 1424+240, using spectroscopic data from both HST/COS and STIS. The absorber is a weak Mg ii analogue, with an incidence of weak C ii and Si ii, along with multicomponent C iv and O vi. The low ions are tracing a dense (nH ∼ 10−3 cm−3) parsec-scale cloud of solar or higher metallicity. The kinematically coincident higher ions are either from a more diffuse (nH ∼ 10−5–10−4 cm−3) photoionized phase of kiloparsec-scale dimensions or are tracing a warm (T ∼ 2 × 105 K) collisionally ionized transition temperature plasma layer. The absorber resides in a galaxy overdense region, with 18 luminous (>L*) galaxies within a projected radius of 5 Mpc and velocity of 750 km s−1. The multiphase properties, high metallicity, and proximity to a 1.4L* galaxy, at ρ ∼ 200 kpc and separation |Δv| = 11 km s−1, favour the possibility of the absorption tracing circumgalactic gas. The absorber serves as an example of weak Mg ii–O vi systems as a means to study multiphase high-velocity clouds in external galaxies.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [1]; ORCiD logo [4];  [5]; ORCiD logo [5];  [5]
  1. Department of Earth and Space Sciences, Indian Institute of Space Science & Technology, Thiruvananthapuram 695547, India
  2. Department of Mechanical Engineering, Federal Institute of Science And Technology, Ernakulam 683577, India
  3. Department of Physics, National Institute of Technology Karnataka, Mangaluru 575025, India
  4. Department of Physics, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
  5. Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Laboratory University Park, PA 16802, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1599653
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 493 Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Pradeep, Jayadev, Sankar, Sriram, Umasree, T. M., Narayanan, Anand, Khaire, Vikram, Gebhardt, Matthew, Sameer,, and Charlton, Jane C. Solar-metallicity gas in the extended halo of a galaxy at z ∼ 0.12. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa184.
Pradeep, Jayadev, Sankar, Sriram, Umasree, T. M., Narayanan, Anand, Khaire, Vikram, Gebhardt, Matthew, Sameer,, & Charlton, Jane C. Solar-metallicity gas in the extended halo of a galaxy at z ∼ 0.12. United Kingdom. doi:10.1093/mnras/staa184.
Pradeep, Jayadev, Sankar, Sriram, Umasree, T. M., Narayanan, Anand, Khaire, Vikram, Gebhardt, Matthew, Sameer,, and Charlton, Jane C. Wed . "Solar-metallicity gas in the extended halo of a galaxy at z ∼ 0.12". United Kingdom. doi:10.1093/mnras/staa184.
@article{osti_1599653,
title = {Solar-metallicity gas in the extended halo of a galaxy at z ∼ 0.12},
author = {Pradeep, Jayadev and Sankar, Sriram and Umasree, T. M. and Narayanan, Anand and Khaire, Vikram and Gebhardt, Matthew and Sameer, and Charlton, Jane C.},
abstractNote = {ABSTRACT We present the detection and analysis of a weak low-ionization absorber at z = 0.121 22 along the sightline of the blazar PG 1424+240, using spectroscopic data from both HST/COS and STIS. The absorber is a weak Mg ii analogue, with an incidence of weak C ii and Si ii, along with multicomponent C iv and O vi. The low ions are tracing a dense (nH ∼ 10−3 cm−3) parsec-scale cloud of solar or higher metallicity. The kinematically coincident higher ions are either from a more diffuse (nH ∼ 10−5–10−4 cm−3) photoionized phase of kiloparsec-scale dimensions or are tracing a warm (T ∼ 2 × 105 K) collisionally ionized transition temperature plasma layer. The absorber resides in a galaxy overdense region, with 18 luminous (>L*) galaxies within a projected radius of 5 Mpc and velocity of 750 km s−1. The multiphase properties, high metallicity, and proximity to a 1.4L* galaxy, at ρ ∼ 200 kpc and separation |Δv| = 11 km s−1, favour the possibility of the absorption tracing circumgalactic gas. The absorber serves as an example of weak Mg ii–O vi systems as a means to study multiphase high-velocity clouds in external galaxies.},
doi = {10.1093/mnras/staa184},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 493,
place = {United Kingdom},
year = {2020},
month = {1}
}

Journal Article:
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DOI: 10.1093/mnras/staa184

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