2023AJ....166..113R

Query : 2023AJ....166..113R

2023AJ....166..113R - Astron. J., 166, 113 (2023/September-0)

A Search for Gas-Rich Dwarf Galaxies in the Local Universe with ALFALFA and the WIYN One Degree Imager.

RHODE K.L., SMITH N.J., JANESH W.F., SALZER J.J., ADAMS E.A.K., HAYNES M.P., JANOWIECKI S. and CANNON J.M.

Abstract (from CDS):

We present results from an optical search for Local Group dwarf galaxy candidates associated with the Ultra-Compact High Velocity Clouds (UCHVCs) discovered by the ALFALFA neutral hydrogen survey. The ALFALFA UCHVCs are isolated, compact H I clouds with projected sizes, velocities, and estimated H I masses that suggest they may be nearby dwarf galaxies, but that have no clear counterpart in existing optical survey data. We observed 26 UCHVCs with the WIYN 3.5 m telescope and One Degree Imager (ODI) in two broadband filters and searched the images for resolved stars with properties that match those of stars in typical dwarf galaxies at distances <2.5 Mpc. We identify one promising dwarf galaxy candidate at a distance of ∼570 kpc associated with the UCHVC AGC 268071, and five other candidates that may deserve additional follow-up. We carry out a detailed analysis of ODI imaging of a UCHVC that is close in both projected distance and radial velocity to the outer-halo Milky Way globular cluster Pal 3. We also use our improved detection methods to reanalyze images of five UCHVCs that were found to have possible optical counterparts during the first phase of the project, and confirm the detection of a possible stellar counterpart to the UCHVC AGC 249525 at an estimated distance of ∼2 Mpc. We compare the optical and H I properties of the dwarf galaxy candidates to the results from recent theoretical simulations that model satellite galaxy populations in group environments, as well as to the observed properties of galaxies in and around the Local Group.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Dwarf galaxies - Local Group - Neutral hydrogen clouds - Sloan photometry - Optical observation - Extragalactic radio sources - Stellar photometry

Simbad objects: 57

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Number of rows : 57
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 AGC 103722 LSB 00 14 45.99936 +10 48 46.9620           ~ 29 0
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 AGC 749140 G 00 51 15.5 +15 11 21           ~ 2 0
4 HVC 123.7-33.4-289 HVC 00 54 31.6 +29 24 02           ~ 5 0
5 AGC 116548 G 01 06 00.7 +12 26 57           ~ 1 0
6 LEDA 5072711 G 01 19 11.700 +11 07 18.22           ~ 26 0
7 AGC 115710 G 01 26 21.5 +05 23 08           ~ 1 0
8 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
9 LEDA 1858273 G 02 03 45.1918857624 +29 10 53.169560364           ~ 9 0
10 AGC 122835 G 02 05 33.0 +29 13 58           ~ 5 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
12 HVC 196.0+24.7+166 HVC 07 56 14.8 +25 09 00           ~ 6 0
13 AGC 198606 G 09 30 02.5 +16 38 08           ~ 10 0
14 AGC 198683 G 09 32 08.0 +23 37 52           ~ 2 0
15 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
16 AGC 501816 G 10 05 19.4 -00 02 26           ~ 1 0
17 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 354 1
18 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 268 0
19 AGC 208752 G 10 23 09.0 +20 40 59           ~ 1 0
20 AGC 208315 HVC 10 26 58.6 +08 46 59           ~ 5 0
21 AGC 208524 G 10 47 02.5 +01 46 31           ~ 1 0
22 HVC 250.1+57.4+139 HVC 11 09 29.8 +05 26 01           ~ 6 0
23 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 379 1
24 AGC 219663 G 11 34 29.7 +20 12 49           ~ 2 0
25 HVC 245.2+69.5+217 HVC 11 40 08.1 +15 06 44           ~ 6 0
26 AGC 219656 G 11 51 24.3 +20 32 20           ~ 3 0
27 HVC 277.2+65.1-140 HVC 12 09 20.0 +04 23 30           ~ 7 0
28 SECCO 1 G 12 21 53.96 +13 27 36.5     19.9     ~ 26 0
29 AGC 226067 G 12 21 55.2 +13 28 10           ~ 24 0
30 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1126 1
31 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
32 AGC 229327 G 12 32 31.6 +17 57 21           ~ 2 0
33 AGC 227988 G 12 46 23.5 +04 48 48           ~ 2 0
34 AGC 233763 G 13 12 44.0 +13 31 18           ~ 7 0
35 AGC 233831 G 13 22 41.0 +11 52 05           ~ 7 0
36 AGC 232765 G 13 23 08.5 +15 11 06           ~ 3 0
37 AGC 249441 G 14 07 00.8 +00 13 23           ~ 1 0
38 HVC 028.0+71.8-144 G 14 11 05.5 +24 11 36           ~ 7 0
39 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
40 AGC 249525 HVC 14 17 53.4 +17 32 42           ~ 6 0
41 HVC 352.4+59.0+263 HVC 14 23 57.7 +05 23 40           ~ 6 0
42 HVC 356.8+58.5+148 HVC 14 31 58.8 +06 35 20           ~ 6 0
43 AGC 249565 G 14 35 57.6 +17 10 04           ~ 2 0
44 HVC 013.6+54.2+179 HVC 15 08 24.4 +11 24 22           ~ 6 0
45 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
46 HVC 026.1+45.8+163 HVC 15 53 54.0 +14 41 48           ~ 5 0
47 SDSS J155509.50+143027.5 G 15 55 09.52539 +14 30 27.6809           ~ 11 0
48 HVC 029.5+43.8+175 HVC 16 05 29.4 +16 09 12           ~ 5 0
49 HVC 028.0+43.4+150 HVC 16 05 32.6 +14 59 20           ~ 7 0
50 HVC 028.0+41.5+127 HVC 16 12 36.8 +14 12 26           ~ 5 0
51 HVC 019.1+35.2-123 G 16 22 31.20 +05 10 03.4           ~ 5 0
52 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
53 HVC 088.1-39.3-445 HVC 23 02 11.3 +16 00 48           ~ 3 0
54 AGC 333604 G 23 11 24.2 +27 56 15           ~ 2 0
55 AGC 335755 G 23 14 16.4 +03 23 07           ~ 1 0
56 AGC 333651 G 23 55 21.4 +25 17 26           ~ 1 0
57 NAME Local Group GrG ~ ~           ~ 9325 0

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