Journal Article

A peculiar H <span class="smallCaps">i</span> cloud near the distant globular cluster Pal 4

Jacco Th. Van Loon, Snežana Stanimirović, Mary E. Putman, Joshua E. G. Peek, Steven J. Gibson, Kevin A. Douglas and Eric J. Korpela

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 2, pages 1096-1105
Published in print June 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14778.x
A peculiar H i cloud near the distant globular cluster Pal 4

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We present 21-cm observations of four Galactic globular clusters, as part of the on-going Galactic Arecibo L-band Feed Array (GALFA) H i survey at Arecibo. We discovered a peculiar H i cloud in the vicinity of the distant (109 kpc) cluster Pal 4, and discuss its properties and likelihood of association with the cluster. We conclude that an association of the H i cloud and Pal 4 is possible, but that a chance coincidence between Pal 4 and a nearby compact high-velocity cloud cannot be ruled out altogether. New, more stringent upper limits were derived for the other three clusters: M 3, NGC 5466, and Pal 13. We briefly discuss the fate of globular cluster gas and the interaction of compact clouds with the Galactic halo gas.

Keywords: ISM: clouds; globular clusters: individual: Pal 4; Galaxy: halo; galaxies: dwarf; dark matter; radio lines: ISM

Journal Article.  7684 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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