Journal article
AGC 226067: A possible interacting low-mass system
Astronomy and astrophysics (Berlin), Vol.580, p.A134
08/2015
DOI: 10.1051/0004-6361/201526857
Abstract
We present Arecibo, GBT, VLA, and WIYN/pODI observations of the ALFALFA source AGC 226067. Originally identified as an ultra-compact high velocity cloud and candidate Local Group galaxy, AGC 226067 is spatially and kinematically coincident with the Virgo cluster, and the identification by multiple groups of an optical counterpart with no resolved stars supports the interpretation that this systems lies at the Virgo distance (D = 17 Mpc). The combined observations reveal that the system consists of multiple components: a central H i source associated with the optical counterpart (AGC 226067), a smaller H i-only component (AGC 229490), a second optical component (AGC 229491), and extended low-surface brightness H i. Only ~1/4 of the single-dish H i emission is associated with AGC 226067; as a result, we find MHI/Lg ~ 6M⊙/L⊙ which is lower than previous work. At D = 17 Mpc, AGC 226067 has an H i mass of 1.5 × 107M⊙ and Lg = 2.4 × 106L⊙, AGC 229490 (the H i-only component) has MHI = 3.6 × 106M⊙, and AGC 229491 (the second optical component) has Lg = 3.6 × 105L⊙. The nature of this system of three sources is uncertain: AGC 226067 and AGC 229490 may be connected by an H i bridge, and AGC 229490 and AGC 229491 are separated by only 0.5′. The current data do not resolve the H i in AGC 229490 and its origin is unclear. We discuss possible scenarios for this system of objects: an interacting system of dwarf galaxies, accretion of material onto AGC 226067, or stripping of material from AGC 226067.
Details
- Title: Subtitle
- AGC 226067: A possible interacting low-mass system
- Creators
- E. A. K. Adams - Netherlands Institute for Radio AstronomyJ. M. Cannon - Macalester CollegeK. L. Rhode - Indiana University BloomingtonW. F. Janesh - Indiana University BloomingtonS. Janowiecki - Indiana University BloomingtonL. Leisman - Cornell UniversityR. Giovanelli - Cornell UniversityM. P. Haynes - Cornell UniversityT. A. Oosterloo - Netherlands Institute for Radio AstronomyJ. J. Salzer - Indiana University BloomingtonT. Zaidi - Macalester College
- Resource Type
- Journal article
- Publication Details
- Astronomy and astrophysics (Berlin), Vol.580, p.A134
- Publisher
- EDP Sciences
- DOI
- 10.1051/0004-6361/201526857
- ISSN
- 0004-6361
- eISSN
- 1432-0746
- Number of pages
- 6
- Language
- English
- Date published
- 08/2015
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627235702771
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