2015ApJ...806...95S

Query : 2015ApJ...806...95S

2015ApJ...806...95S - Astrophys. J., 806, 95 (2015/June-2)

A comprehensive archival search for counterparts to ultra-compact high-velocity clouds: five local volume dwarf galaxies.

SAND D.J., CRNOJEVIC D., BENNET P., WILLMAN B., HARGIS J., STRADER J., OLSZEWSKI E., TOLLERUD E.J., SIMON J.D., CALDWELL N., GUHATHAKURTA P., JAMES B.L., KOPOSOV S., McLEOD B., MORRELL N., PEACOCK M., SALINAS R., SETH A.C., STARK D.P. and TOLOBA E.

Abstract (from CDS):

We report five Local Volume dwarf galaxies (two of which are presented here for the first time) uncovered during a comprehensive archival search for optical counterparts to ultra-compact high-velocity clouds (UCHVCs). The UCHVC population of HI clouds are thought to be candidate gas-rich, low-mass halos at the edge of the Local Group and beyond, but no comprehensive search for stellar counterparts to these systems has been presented. Careful visual inspection of all publicly available optical and ultraviolet imaging at the position of the UCHVCs revealed six blue, diffuse counterparts with a morphology consistent with a faint dwarf galaxy beyond the Local Group. Optical spectroscopy of all six candidate dwarf counterparts show that five have an Hα-derived velocity consistent with the coincident HI cloud, confirming their association; the sixth diffuse counterpart is likely a background object. The size and luminosity of the UCHVC dwarfs is consistent with other known Local Volume dwarf irregular galaxies. The gas fraction () of the five dwarfs are generally consistent with that of dwarf irregular galaxies in the Local Volume, although ALFALFA-Dw1 (associated with ALFALFA UCHVC HVC274.68+74.70-123) has a very high Å 40. Despite the heterogenous nature of our search, we demonstrate that the current dwarf companions to UCHVCs are at the edge of detectability due to their low surface brightness, and that deeper searches are likely to find more stellar systems. If more sensitive searches do not reveal further stellar counterparts to UCHVCs, then the dearth of such systems around the Local Group may be in conflict with ΛCDM simulations.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: individual: (ALFALFA-Dw1, GALFA-Dw1, GALFA-Dw2, GALFA-Dw3, GALFA-Dw4) - radio lines: galaxies

VizieR on-line data: <Available at CDS (J/ApJ/806/95): table1.dat table3.dat>

Nomenclature: Table 4: [SCB2015] GALFA-DwN (Nos Dw1-Dw4), Table 4: [SCB2015] ALFALFA-DwN (No Dw1).

Simbad objects: 102

goto Full paper

goto View the references in ADS

Number of rows : 102
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 HVC 111.6-30.5-124 HVC 00 05 54.3 +31 20 14           ~ 3 0
2 AGC 103722 LSB 00 14 45.99936 +10 48 46.9620           ~ 29 0
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 HVC 123.1-33.6-176 HVC 00 52 06.2 +29 12 04           ~ 4 0
5 HVC 123.7-33.4-289 HVC 00 54 31.6 +29 24 02           ~ 5 0
6 HVC 126.8-46.6-310 HVC 01 02 37.8 +16 07 52           ~ 4 0
7 HVC 131.9-46.5-276 HVC 01 17 03.4 +15 55 48           ~ 2 0
8 LEDA 5072711 G 01 19 11.700 +11 07 18.22           ~ 26 0
9 Z 436-33 AG? 01 21 18.90 +12 24 43.0 15.36 14.82 14.36 12.87   ~ 112 0
10 HVC 137.9-31.7-327 G 01 49 59.6 +29 25 12           ~ 4 0
11 [SPG2012] 027.6+28.4-319 HVC 01 50 31.4 +28 22 59           ~ 5 0
12 AGC 122836 G 02 52 14.5 +26 26 29           ~ 4 0
13 LEDA 94400 GiC 02 58 56.24 +13 37 47.9   16.92       ~ 6 0
14 [SPG2012] 044.7+13.6+528 G? 02 58 57 +13 37.0           ~ 3 0
15 [DPP2015] 3 G 04 14 47.9 +33 18 35           ~ 4 0
16 [SPG2012] 084.4+24.0+152 G? 05 37 33 +24 02.0           ~ 2 0
17 LEDA 5072715 G 05 45 44.79 +10 46 15.6           ~ 11 0
18 [SPG2012] 086.4+10.8+611 G? 05 45 45 +10 46.0           ~ 2 0
19 [SPG2012] 086.4+31.8+612 G? 05 45 45 +31 46.0           ~ 2 0
20 [SPG2012] 090.9+30.9+266 G? 06 03 37 +30 53.0           ~ 2 0
21 [SPG2012] 092.1+09.5+584 G? 06 08 33 +09 29.0           ~ 2 0
22 [SPG2012] 100.0+36.7+417 G? 06 39 49 +36 41.0           ~ 3 0
23 [SPG2012] 100.9+09.2+311 G? 06 43 33 +09 13.0           ~ 2 0
24 [SPG2012] 104.4+04.1-145 G? 06 57 37 +04 07.0           ~ 2 0
25 [SPG2012] 116.5+15.0+149 HVC 07 45 59.9 +14 58 37           ~ 7 0
26 HVC 196.5+24.4+146 HVC 07 55 27.1 +24 41 43           ~ 4 0
27 HVC 196.0+24.7+166 HVC 07 56 14.8 +25 09 00           ~ 6 0
28 HVC 198.4+31.0+165 HVC 08 25 46.7 +25 11 28           ~ 4 0
29 [SPG2012] 142.6+24.2+146 HVC 09 30 13.2 +24 12 17           ~ 8 0
30 [SPG2012] 143.7+12.9+223 G? 09 34 41 +12 51.0           ~ 3 0
31 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
32 LEDA 1314481 AG? 09 48 05.927 +07 07 41.15           ~ 21 0
33 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
34 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 268 0
35 AGC 208315 HVC 10 26 58.6 +08 46 59           ~ 5 0
36 [SPG2012] 162.1+12.5+434 G? 10 48 25 +12 31.0           ~ 4 0
37 NGC 3389 GiG 10 48 27.9084984144 +12 31 59.659616244   12.0       ~ 244 2
38 HVC 250.1+57.4+139 HVC 11 09 29.8 +05 26 01           ~ 6 0
39 HVC 252.9+60.1+142 HVC 11 21 19.6 +06 21 32           ~ 3 0
40 LEDA 1327584 G 11 26 20.1600759336 +07 39 45.076597236           ~ 8 0
41 HVC 255.7+61.4+181 HVC 11 28 55.6 +06 25 29           ~ 4 0
42 HVC 256.3+61.3+166 HVC 11 29 28.6 +06 09 23           ~ 3 0
43 HVC 245.2+69.5+217 HVC 11 40 08.1 +15 06 44           ~ 6 0
44 HVC 277.2+65.1-140 HVC 12 09 20.0 +04 23 30           ~ 7 0
45 [SPG2012] 183.0+04.4-112 G? 12 12 10 +04 23.0           ~ 4 0
46 [DPP2015] 7 G 12 19 11.76 +05 40 09.1           ~ 4 0
47 SECCO 1 G 12 21 53.96 +13 27 36.5     19.9     ~ 26 0
48 AGC 226067 G 12 21 55.2 +13 28 10           ~ 24 0
49 SDSS J122942.96+104525.0 Sy2 12 29 42.9615849624 +10 45 24.913701540           ~ 88 0
50 IC 3418 LIN 12 29 43.919 +11 24 16.87   16.5       ~ 127 1
51 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2174 2
52 AGC 227874 G 12 29 54 +07 58.0           ~ 16 0
53 Z 42-135 LSB 12 30 00.350 +07 55 47.44   15.4       ~ 140 0
54 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
55 AGC 226165 G 12 34 33.84 +08 23 20.5           ~ 8 0
56 [SPG2012] 188.9+14.5+387 G? 12 35 26 +14 30.0           ~ 4 0
57 M 91 LIN 12 35 26.4446761320 +14 29 46.760333748   14.63 13.57     ~ 639 0
58 HVC 292.9+70.4+159 HVC 12 37 58.5 +07 48 49           ~ 4 0
59 AGC 226170 G 12 42 05.7 +09 54 14           ~ 6 0
60 [DPP2015] 69 G 12 45 23.76 +05 18 32.7           ~ 7 0
61 [SPG2012] 195.9+06.9-100 G? 13 03 38 +06 55.0           ~ 3 0
62 [DPP2015] 11 G 13 06 09.84 +06 30 24.9           ~ 4 0
63 AGC 233763 G 13 12 44.0 +13 31 18           ~ 7 0
64 Z 72-26 AG? 13 13 19.653 +10 11 38.53   15.2       ~ 37 0
65 AGC 233831 G 13 22 41.0 +11 52 05           ~ 7 0
66 HVC 326.9+65.2+316 HVC 13 30 43.8 +04 13 38           ~ 6 0
67 HVC 028.0+71.8-144 G 14 11 05.5 +24 11 36           ~ 7 0
68 HVC 353.4+61.0+257 HVC 14 19 48.6 +07 11 15           ~ 6 0
69 HVC 351.1+58.5+214 HVC 14 23 21.2 +04 34 37           ~ 5 0
70 [SPG2012] 215.9+04.6+205 G? 14 23 26 +04 33.0           ~ 4 0
71 HVC 352.4+59.0+263 HVC 14 23 57.7 +05 23 40           ~ 6 0
72 HVC 356.8+58.5+148 HVC 14 31 58.8 +06 35 20           ~ 6 0
73 HVC 005.5+52.0+163 HVC 15 04 41.3 +06 12 59           ~ 6 0
74 HVC 013.5+54.5+169 HVC 15 07 23.0 +11 32 56           ~ 6 0
75 HVC 013.6+54.2+179 HVC 15 08 24.4 +11 24 22           ~ 6 0
76 HVC 013.6+53.7+222 HVC 15 10 00.6 +11 11 27           ~ 6 0
77 HVC 026.1+45.8+163 HVC 15 53 54.0 +14 41 48           ~ 5 0
78 SDSS J155509.50+143027.5 G 15 55 09.52539 +14 30 27.6809           ~ 11 0
79 HVC 029.5+43.8+175 HVC 16 05 29.4 +16 09 12           ~ 5 0
80 HVC 028.0+43.4+150 HVC 16 05 32.6 +14 59 20           ~ 7 0
81 HVC 028.4+43.1+177 HVC 16 07 07.0 +15 08 31           ~ 4 0
82 HVC 028.0+41.5+127 HVC 16 12 36.8 +14 12 26           ~ 5 0
83 HVC 028.6+40.3+125 HVC 16 17 45.3 +14 10 36           ~ 4 0
84 HVC 019.1+35.2-123 G 16 22 31.20 +05 10 03.4           ~ 5 0
85 HVC 027.8+38.2+124 HVC 16 24 43.4 +12 44 12           ~ 6 0
86 HVC 084.0-17.9-311 HVC 21 54 06.2 +31 12 49           ~ 4 0
87 HVC 082.9-20.4-426 HVC 21 58 02.9 +28 37 35           ~ 4 0
88 AGC 321318 HVC 22 00 55.4 +24 45 10           ~ 5 0
89 [SPG2012] 331.8+21.0+303 G? 22 07 06 +20 59.0           ~ 3 0
90 HVC 086.1-21.3-277 HVC 22 11 21.8 +29 54 02           ~ 4 0
91 AGC 321320 HVC 22 12 27.6 +24 43 30           ~ 5 0
92 AGC 321351 HVC 22 21 30.5 +24 36 58           ~ 5 0
93 [SPG2012] 339.0+09.0-237 G? 22 36 06 +09 02.0           ~ 4 0
94 HVC 092.5-23.0-311 HVC 22 38 23.4 +31 52 57           ~ 4 0
95 LAMOST J224651.84+074120.0 G 22 46 51.84 +07 41 20.2           ~ 5 0
96 [SPG2012] 342.1+20.6+208 G? 22 48 26 +20 33.0           ~ 4 0
97 [DPP2015] 16 G 22 59 49.92 +07 01 43.5           ~ 4 0
98 HVC 087.3-39.7-454 HVC 23 00 56.4 +15 20 14           ~ 2 0
99 HVC 088.1-39.3-445 HVC 23 02 11.3 +16 00 48           ~ 3 0
100 HVC 108.9-31.8-328 HVC 23 56 58.8 +29 32 35           ~ 4 0
101 HVC 109.0-31.5-324 HVC 23 57 02.1 +29 48 46           ~ 4 0
102 NAME Local Group GrG ~ ~           ~ 9325 0

To bookmark this query, right click on this link: simbad:objects in 2015ApJ...806...95S and select 'bookmark this link' or equivalent in the popup menu