SIMBAD references

2017ApJ...837L..16J - Astrophys. J., 837, L16-L16 (2017/March-2)

Detection of an optical counterpart to the ALFALFA ultra-compact high-velocity cloud AGC 249525.

JANESH W., RHODE K.L., SALZER J.J., JANOWIECKI S., ADAMS E.A.K., HAYNES M.P., GIOVANELLI R. and CANNON J.M.

Abstract (from CDS):

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 -7.1 MV -4.5, a stellar mass between 2.2±0.6×104 M and 3.6±1.0×105 M, 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.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: dwarf - galaxies: photometry - galaxies: stellar content - galaxies: stellar content

Simbad objects: 15

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2021.07.25-06:33:13

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