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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:1307.6368 (astro-ph)
[Submitted on 24 Jul 2013]

Title:HI in HO: Hoag's object revisited

Authors:Noah Brosch, Ido Finkelman, Tom Oosterloo, Gyula Jozsa, Alexei Moiseev
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Abstract:We present new HI observations of Hoag's Object obtained with the Westerbork Synthesis Radio Telescope (WSRT). The data show that the luminous optical ring around the elliptical body has a bright HI counterpart that shares the kinematical properties of the optical ring. The entire HI structure is twice as large as the optical ring and shows a mild warp in its outer regions relative to the inner ring. We detect two additional HI sources close in redshift to that of Hoag's Object, and report on a newly identified SDSS optical companion galaxy. The HI sources are ~0.3 and ~1 Mpc away in projected distance, and the companion galaxy is also ~1 Mpc away. Our main conclusion is that the HI detected in Hoag's Object shows no indication that this galaxy has experienced a recent (less than ~1 Gyr ago) accretion event. At least one of the two additional HI detected objects does not have an optical counterpart. One possibility is that this object is an HI filament left over from an interaction shaping Hoag's Object, in which case this interaction must also have occurred at least 1-2 Gyr ago.
Comments: Accepted for publication in MNRAS
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:1307.6368 [astro-ph.CO]
  (or arXiv:1307.6368v1 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.1307.6368
Related DOI: https://doi.org/10.1093/mnras/stt1348

Submission history

From: Tom Oosterloo [view email]
[v1] Wed, 24 Jul 2013 10:12:01 UTC (3,459 KB)
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