Journal Article

Survey of O <span class="smallCaps">vi</span> absorption in the Large Magellanic Cloud

A. Pathak, A. C. Pradhan, N. V. Sujatha and J. Murthy

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 412, issue 2, pages 1105-1122
Published in print April 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI:
Survey of O vi absorption in the Large Magellanic Cloud

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We present a survey of interstellar O vi absorption in the Large Magellanic Cloud (LMC) towards 70 lines of sight based on Far Ultraviolet Spectroscopic Explorer (FUSE) observations. The survey covers O vi absorption in a large number of objects in different environmental conditions of the LMC. Overall, a high abundance of O vi is present in active and inactive regions of the LMC with mean log N(O vi) = 14.23 atoms cm−2. There is no correlation observed between O vi absorption and emissions from the hot gas (X-ray surface brightness) or the warm gas (Hα surface brightness). O vi absorption in the LMC is patchy and the properties are similar to that of the Milky Way (MW). In comparison to the Small Magellanic Cloud (SMC), O vi is lower in abundance even though SMC has a lower metallicity compared to the LMC and the MW. We present observations in 10 superbubbles of the LMC of which we detect O vi absorption in five superbubbles for the first time and the superbubbles show an excess O vi absorption of about 40 per cent compared to non-superbubble lines of sight. We have also studied the properties of O vi absorption in the 30 Doradus region. Even though O vi does not show any correlation with X-ray emission for the LMC, a good correlation between log N(O vi) and X-ray surface brightness for 30 Doradus region is present. We also find that O vi abundance decreases with increasing distance from the star cluster R136.

Keywords: ISM: atoms; ISM: structure; galaxies: individual: Large Magellanic Cloud; galaxies: ISM; ultraviolet: ISM

Journal Article.  7772 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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