Journal article
Detection of an Optical Counterpart to the ALFALFA Ultra-compact High-velocity Cloud AGC 249525
Astrophysical journal. Letters, Vol.837(2), pp.L16-L16
03/10/2017
DOI: 10.3847/2041-8213/aa62a1
Abstract
We report on the detection at >98% confidence of an optical counterpart to AGC 249525, an ultra-compact high-velocity cloud (UCHVC) discovered by the Arecibo Legacy Fast ALFA survey blind neutral hydrogen survey. UCHVCs are compact, isolated H i clouds with properties consistent with their being nearby low-mass galaxies, but without identified counterparts in extant optical surveys. Analysis of the resolved stellar sources in deep g- and i-band imaging from the WIYN pODI camera reveals a clustering of possible red giant branch stars associated with AGC 249525 at a distance of 1.64 0.45 Mpc. Matching our optical detection with the H i synthesis map of AGC 249525 from Adams et al. shows that the stellar overdensity is exactly coincident with the highest-density H i contour from that study. Combining our optical photometry and the H i properties of this object yields an absolute magnitude of , a stellar mass between and , and an H i to stellar mass ratio between 9 and 144. This object has stellar properties within the observed range of gas-poor ultra-faint dwarfs in the Local Group, but is gas-dominated.
Details
- Title: Subtitle
- Detection of an Optical Counterpart to the ALFALFA Ultra-compact High-velocity Cloud AGC 249525
- Creators
- William Janesh - Indiana University BloomingtonKatherine L. Rhode - Indiana University BloomingtonJohn J. Salzer - Indiana University BloomingtonSteven Janowiecki - International Centre for Radio Astronomy ResearchElizabeth A. K. Adams - Netherlands Institute for Radio AstronomyMartha P. Haynes - Cornell UniversityRiccardo Giovanelli - Cornell UniversityJohn M. Cannon - Macalester College
- Resource Type
- Journal article
- Publication Details
- Astrophysical journal. Letters, Vol.837(2), pp.L16-L16
- Publisher
- The American Astronomical Society
- DOI
- 10.3847/2041-8213/aa62a1
- ISSN
- 2041-8205
- eISSN
- 2041-8213
- Number of pages
- 6
- Alternative title
- Detection of an Optical Counterpart to the ALFALFA Ultra-compact High-velocity Cloud AGC 249525
- Language
- English
- Date published
- 03/10/2017
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627316002771
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