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Title: METAL TRANSPORT TO THE GASEOUS OUTSKIRTS OF GALAXIES

Abstract

We present a search for outlying H II regions in the extended gaseous outskirts of nearby (D < 40 Mpc) galaxies and subsequent multi-slit spectroscopy used to obtain the H II region nebular oxygen abundances. The galaxies in our sample have extended H I disks and/or interaction-related H I features that extend well beyond their primary stellar components. We report oxygen abundance gradients out to 2.5 times the optical radius for these galaxies which span a range of morphologies and masses. We analyze the underlying stellar and neutral H I gas distributions in the vicinity of the H II regions to understand the physical processes that give rise to the observed metal distributions in galaxies. These measurements, for the first time, convincingly show flat abundance distributions out to large radii in a wide variety of systems and have broad implications for galaxy chemodynamical evolution.

Authors:
 [1]; ;  [2];  [3]
  1. Department of Astronomy, University of Michigan, 500 Church St., Ann Arbor, MI 48109 (United States)
  2. Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027 (United States)
  3. ICRAR/University of Western Australia, 35 Stirling Highway, Crawley, WA 6009 (Australia)
Publication Date:
OSTI Identifier:
21578427
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 735; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/735/2/71; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DISTRIBUTION; ELEMENT ABUNDANCE; GALACTIC EVOLUTION; GALAXIES; METALS; OXYGEN; TRANSPORT; ABUNDANCE; ELEMENTS; EVOLUTION; NONMETALS

Citation Formats

Werk, J. K., Putman, M. E., Santiago-Figueroa, N., and Meurer, G. R., E-mail: jwerk@ucolick.org. METAL TRANSPORT TO THE GASEOUS OUTSKIRTS OF GALAXIES. United States: N. p., 2011. Web. doi:10.1088/0004-637X/735/2/71.
Werk, J. K., Putman, M. E., Santiago-Figueroa, N., & Meurer, G. R., E-mail: jwerk@ucolick.org. METAL TRANSPORT TO THE GASEOUS OUTSKIRTS OF GALAXIES. United States. doi:10.1088/0004-637X/735/2/71.
Werk, J. K., Putman, M. E., Santiago-Figueroa, N., and Meurer, G. R., E-mail: jwerk@ucolick.org. Sun . "METAL TRANSPORT TO THE GASEOUS OUTSKIRTS OF GALAXIES". United States. doi:10.1088/0004-637X/735/2/71.
@article{osti_21578427,
title = {METAL TRANSPORT TO THE GASEOUS OUTSKIRTS OF GALAXIES},
author = {Werk, J. K. and Putman, M. E. and Santiago-Figueroa, N. and Meurer, G. R., E-mail: jwerk@ucolick.org},
abstractNote = {We present a search for outlying H II regions in the extended gaseous outskirts of nearby (D < 40 Mpc) galaxies and subsequent multi-slit spectroscopy used to obtain the H II region nebular oxygen abundances. The galaxies in our sample have extended H I disks and/or interaction-related H I features that extend well beyond their primary stellar components. We report oxygen abundance gradients out to 2.5 times the optical radius for these galaxies which span a range of morphologies and masses. We analyze the underlying stellar and neutral H I gas distributions in the vicinity of the H II regions to understand the physical processes that give rise to the observed metal distributions in galaxies. These measurements, for the first time, convincingly show flat abundance distributions out to large radii in a wide variety of systems and have broad implications for galaxy chemodynamical evolution.},
doi = {10.1088/0004-637X/735/2/71},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 735,
place = {United States},
year = {2011},
month = {7}
}