A peculiar HI cloud near the distant globular cluster Pal 4
Jacco Th. van Loon (Keele University), Snezana Stanimirovic (U., Wisconsin-Madison), Mary Putman (Columbia University), Joshua E.G. Peek (UC, Berkeley), Steven J. Gibson (Western Kentucky University), Kevin A. Douglas, (University of Exeter), and Eric J. Korpela (UC Berkeley)
TL;DR
This paper reports the discovery of a peculiar HI cloud near the distant globular cluster Pal 4, exploring its properties and possible association, and provides new upper limits for gas detection in other clusters.
Contribution
It presents the first detection of an unusual HI cloud near Pal 4 and analyzes its potential link to the cluster, advancing understanding of globular cluster gas interactions.
Findings
Possible association between the HI cloud and Pal 4.
New upper limits for HI in other clusters.
Discussion on globular cluster gas fate and cloud interactions.
Abstract
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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.