Discovery of a large HI ring around the quiescent galaxy AGC 203001

Abstract

Here we report the discovery with the Giant Metrewave Radio Telescope of an extremely large ($\sim$115 kpc in diameter) HI ring off-centered from a massive quenched galaxy, AGC 203001. This ring does not have any bright extended optical counterpart, unlike several other known ring galaxies. Our deep $g$, $r$, and $i$ optical imaging of the HI ring, using the MegaCam instrument on the Canada-France-Hawaii Telescope, however, shows several regions with faint optical emission at a surface brightness level of $\sim$28 mag/arcsec${}^2$. Such an extended HI structure is very rare with only one other case known so far -- the Leo ring. Conventionally, off-centered rings have been explained by a collision with an "intruder" galaxy leading to expanding density waves of gas and stars in the form of a ring. However, in such a scenario the impact also leads to large amounts of star formation in the ring which is not observed in the ring presented in this paper. We discuss possible scenarios for the formation of such HI dominated rings.

Accepted for publication in MNRAS, 7 pages, 5 figures and 2 tables

References in corpus (12)

• The GALEX Ultraviolet Atlas of Nearby Galaxies
• GALEX-SDSS-WISE Legacy Catalog (GSWLC): Star Formation Rates, Stellar Masses and Dust Attenuations of 700,000 Low-redshift Galaxies
• A Search for Extended Ultraviolet Disk (XUV-disk) Galaxies in the Local Universe
• The Atlas3D project -- XXIX. The new look of early-type galaxies and surrounding fields disclosed by extremely deep optical images
• Neutral hydrogen in nearby elliptical and lenticular galaxies: the continuing formation of early-type galaxies
• Are ring galaxies the ancestors of giant low surface brightness galaxies?
• A collisional origin for the Leo ring
• Morphology and enhanced star formation in a Cartwheel-like ring galaxy
• GASS 3505: the prototype of HI-excess, passive galaxies
• Star formation associated with neutral hydrogen in the outskirts of early-type galaxies
• Pre-existing dwarfs, tidal knots and a tidal dwarf galaxy: an unbiased HI study of the gas-rich interacting galaxy group NGC 3166/9
• An extremely optically dim tidal feature in the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877

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• The detection of a massive chain of dark HI clouds in the GAMA G23 Field
• Gaseous nebulae and massive stars in the giant HI ring in Leo