A peculiar HI cloud near the distant globular cluster Pal 4

Details A peculiar HI cloud near the distant globular cluster Pal 4 A peculiar HI cloud near the distant globular cluster Pal 4

2009-03-13

arxiv.org/abs/0903.2391v1

Mon.Not.Roy.Astron.Soc.396:1096-1105,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2009.14778.x

We present 21-cm observations of four Galactic globular clusters, as part of the on-going GALFA-HI Survey at Arecibo. We discovered a peculiar HI 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 HI 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.

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