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Limits on the H I content of the dwarf galaxy Hydra II

Janzen, Andrew and Klopf, Eve M. and Lockman, Felix J. and Montez, Rodolfo, Jr. and Plarre, Kurt and Pokhrel, Nau Raj and Selina, Robert J. and Togi, Aditya and Zomederis, Mehrnoush (2015) Limits on the H I content of the dwarf galaxy Hydra II. Astronomy and Astrophysics, 584 . Art. No. A101. ISSN 0004-6361. http://resolver.caltech.edu/CaltechAUTHORS:20160115-125714532

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Abstract

Sensitive 21 cm H I  observations have been made with the Green Bank Telescope toward the newly-discovered Local Group dwarf galaxy Hydra II, which may lie within the leading arm of the Magellanic Stream. No neutral hydrogen was detected. Our 5σ limit of M_(HI) ≤ 210 M_⊙ for a 15 km s^(-1) linewidth gives a gas to luminosity ratio M_(HI)/ L_V ≤ 2.6 × 10^(-2) M_⊙ L_⊙^(-1). The limits on H I  mass and M_(HI)/L_V are typical of dwarf galaxies found within a few hundred kpc of the Milky Way. Whatever the origin of Hydra II, its neutral gas properties are not unusual.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1051/0004-6361/201527332DOIArticle
http://www.aanda.org/articles/aa/abs/2015/12/aa27332-15/aa27332-15.htmlPublisherArticle
http://arxiv.org/abs/1511.05069arXivDiscussion Paper
Additional Information:© ESO, 2015. Received 8 September 2015 / Accepted 27 October 2015. We thank K. Spekkens for useful discussions and Richard Prestage for comments on the manuscript. These measurements were performed as part of the 2015 NRAO/NAIC Single Dish Summer School program.
Subject Keywords:galaxies: dwarf – Galaxy: halo – Local Group – galaxies: individual: Hydra II
Record Number:CaltechAUTHORS:20160115-125714532
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160115-125714532
Official Citation:Limits on the H I content of the dwarf galaxy Hydra II Andrew Janzen, Eve M. Klopf, Felix J. Lockman, Rodolfo Montez Jr, Kurt Plarre, Nau Raj Pokhrel, Robert J. Selina, Aditya Togi and Mehrnoush Zomederis A&A, 584 (2015) A101 Published online: 27 November 2015 DOI: http://dx.doi.org/10.1051/0004-6361/201527332
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63718
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:19 Jan 2016 19:25
Last Modified:19 Jan 2016 19:25

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