2019AJ....157..183J

Query : 2019AJ....157..183J

2019AJ....157..183J - Astron. J., 157, 183-183 (2019/May-0)

Five gas-rich ultrafaint dwarf galaxy candidates discovered in WIYN imaging of ALFALFA sources.

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 present results from the analysis of WIYN pODI imaging of 23 ultracompact high-velocity clouds (UCHVCs), which were identified in the ALFALFA H I survey as possible dwarf galaxies in or near the Local Group. To search for a resolved stellar population associated with the H I gas in these objects, we carried out a series of steps designed to identify stellar overdensities in our optical images. We identify five objects that are likely stellar counterparts to the UCHVCs, at distances of ∼350 kpc to ∼1.6 Mpc. Two of the counterparts were already described in Janesh et al.; the estimated distance and detection significance for one of them changed in the final analysis of the full pODI data set. At their estimated distances, the detected objects have H I masses from 2 x 104 to 3 x 106 M☉, MV from -1.4 to -7.1, and stellar masses from 4 x 102 to 4 x 105 M☉. None of the objects shows evidence of a young stellar population. Their properties would make the UCHVCs some of the most extreme objects in and around the Local Group, comparable to ultrafaint dwarf galaxies in their stellar populations, but with significant gas content. Such objects probe the extreme end of the galaxy mass function and provide a test bed for theories regarding the baryonic feedback processes that impact star formation and galaxy evolution in this low-mass regime.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

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

Simbad objects: 38

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Number of rows : 38
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 LEDA 5072711 G 01 19 11.700 +11 07 18.22           ~ 26 0
3 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
4 [SPG2012] 116.5+15.0+149 HVC 07 45 59.9 +14 58 37           ~ 7 0
5 AGC 198606 G 09 30 02.5 +16 38 08           ~ 10 0
6 [SPG2012] 142.6+24.2+146 HVC 09 30 13.2 +24 12 17           ~ 8 0
7 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
8 AGC 198831 G 09 59 11.8 +18 55 35           ~ 1 0
9 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 221 1
10 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
11 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 268 0
12 AGC 208747 G 10 37 06.6 +20 30 58           ~ 2 0
13 AGC 208753 G 10 49 32.4 +23 56 38           ~ 2 0
14 HVC 245.2+69.5+217 HVC 11 40 08.1 +15 06 44           ~ 6 0
15 AGC 219656 G 11 51 24.3 +20 32 20           ~ 3 0
16 SECCO 1 G 12 21 53.96 +13 27 36.5     19.9     ~ 26 0
17 AGC 226067 G 12 21 55.2 +13 28 10           ~ 24 0
18 AGC 229326 G 12 27 34.7 +17 38 23           ~ 2 0
19 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
20 [DPP2015] 69 G 12 45 23.76 +05 18 32.7           ~ 7 0
21 AGC 238626 G 13 03 51.1 +12 12 23           ~ 1 0
22 HVC 326.9+65.2+316 HVC 13 30 43.8 +04 13 38           ~ 6 0
23 LEDA 2807150 LSB 13 54 33.356 +04 14 39.66   16.8 17.1     ~ 89 0
24 AGC 249320 G 14 05 58.0 +06 08 22           ~ 2 0
25 LEDA 166185 G 14 07 10.1 +35 03 37   16.9 17.2     ~ 94 0
26 AGC 249000 G 14 07 22.9 +15 45 22           ~ 2 0
27 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
28 AGC 249525 HVC 14 17 53.4 +17 32 42           ~ 6 0
29 HVC 353.4+61.0+257 HVC 14 19 48.6 +07 11 15           ~ 6 0
30 HVC 351.1+58.5+214 HVC 14 23 21.2 +04 34 37           ~ 5 0
31 HVC 352.4+59.0+263 HVC 14 23 57.7 +05 23 40           ~ 6 0
32 HVC 005.5+52.0+163 HVC 15 04 41.3 +06 12 59           ~ 6 0
33 HVC 013.5+54.5+169 HVC 15 07 23.0 +11 32 56           ~ 6 0
34 HVC 013.6+53.7+222 HVC 15 10 00.6 +11 11 27           ~ 6 0
35 HVC 028.0+43.4+150 HVC 16 05 32.6 +14 59 20           ~ 7 0
36 HVC 027.8+38.2+124 HVC 16 24 43.4 +12 44 12           ~ 6 0
37 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
38 NAME Local Group GrG ~ ~           ~ 9325 0

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