2015ApJ...808..136D

Query : 2015ApJ...808..136D

2015ApJ...808..136D - Astrophys. J., 808, 136 (2015/August-1)

Finding gas-rich dwarf galaxies betrayed by their ultraviolet emission.

DONOVAN MEYER J., PEEK J.E.G., PUTMAN M. and GRCEVICH J.

Abstract (from CDS):

We present ultraviolet (UV) follow-up of a sample of potential dwarf galaxy candidates selected for their neutral hydrogen (HI) properties, taking advantage of the low UV background seen by the GALEX satellite and its large and publicly available imaging footprint. The HI clouds, which are drawn from published Galactic Arecibo L-band Feed Array and Arecibo Legacy Fast Arecibo L-band Feed Array HI survey compact cloud catalogs, are selected to be galaxy candidates based on their spatial compactness and non-association with known high-velocity cloud complexes or Galactic HI emission. Based on a comparison of their UV characteristics to those of known dwarf galaxies, half (48%) of the compact HI clouds have at least one potential stellar counterpart with UV properties similar to those of nearby dwarf galaxies. If they are galaxies, then the star formation rates, HI masses, and star formation efficiencies of these systems follow the trends seen for much larger galaxies. The presence of UV emission is an efficient method to identify the best targets for spectroscopic follow-up, which is necessary to prove that the stars are associated with compact HI. Furthermore, searches of this nature help to refine the salient HI properties of likely dwarfs (even beyond the Local Group). In particular, HI compact clouds considered to be velocity outliers relative to their neighbor HI clouds have the most significant detection rate of single, appropriate UV counterparts. Correcting for the sky coverage of the two all-Arecibo sky surveys yielding the compact HI clouds, these results may imply the presence of potentially hundreds of new tiny galaxies across the entire sky.

Abstract Copyright: ∼

Journal keyword(s): catalogs - galaxies: dwarf - Local Group - ultraviolet: galaxies

VizieR on-line data: <Available at CDS (J/ApJ/808/136): table1.dat table2.dat>

Nomenclature: Table 1: [DPP2015] NN (Nos 1-98).

Simbad objects: 104

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Number of rows : 104
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 HVC 123.1-33.6-176 HVC 00 52 06.2 +29 12 04           ~ 4 0
4 HVC 123.7-33.4-289 HVC 00 54 31.6 +29 24 02           ~ 5 0
5 HVC 126.8-46.6-310 HVC 01 02 37.8 +16 07 52           ~ 4 0
6 LEDA 5072711 G 01 19 11.700 +11 07 18.22           ~ 26 0
7 HVC 137.9-31.7-327 G 01 49 59.6 +29 25 12           ~ 4 0
8 [SPG2012] 027.6+28.4-319 HVC 01 50 31.4 +28 22 59           ~ 5 0
9 LEDA 94400 GiC 02 58 56.24 +13 37 47.9   16.92       ~ 6 0
10 [SPG2012] 046.9+07.4-256 HVC 03 07 29 +07 22.0           ~ 2 0
11 [DPP2015] 28 G 03 10 29.9 +31 59 03           ~ 2 0
12 [DPP2015] 17 G 03 40 11.0 +10 28 52           ~ 2 0
13 [DPP2015] 3 G 04 14 47.9 +33 18 35           ~ 4 0
14 [SPG2012] 070.5+03.5-069 HI 04 42 09 +03 27.0           ~ 2 0
15 [SPG2012] 072.7+11.7-106 HVC 04 50 53 +11 42.0           ~ 2 0
16 [SPG2012] 079.0+28.3-127 HVC 05 15 57 +28 19.0           ~ 2 0
17 [SPG2012] 082.2+21.3-122 HVC 05 28 57 +21 16.0           ~ 2 0
18 [SPG2012] 100.5+35.2+039 HI 06 42 05 +35 13.0           ~ 2 0
19 AGC 174754 HVC 07 27 45 +24 56.0           ~ 3 0
20 [SPG2012] 116.5+15.0+149 HVC 07 45 59.9 +14 58 37           ~ 7 0
21 HVC 196.5+24.4+146 HVC 07 55 27.1 +24 41 43           ~ 4 0
22 HVC 196.0+24.7+166 HVC 07 56 14.8 +25 09 00           ~ 6 0
23 HVC 198.4+31.0+165 HVC 08 25 46.7 +25 11 28           ~ 4 0
24 [SPG2012] 127.7+06.6+107 HVC 08 30 41 +06 38.0           ~ 2 0
25 AGC 198321 HI 09 02 29 +15 09.0           ~ 3 0
26 [SPG2012] 136.8+15.1+084 HI 09 07 01 +15 08.0           ~ 2 0
27 [SPG2012] 142.6+24.2+146 HVC 09 30 13.2 +24 12 17           ~ 8 0
28 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
29 LEDA 1314481 AG? 09 48 05.927 +07 07 41.15           ~ 21 0
30 [SPG2012] 150.5+24.9+065 HI 10 02 05 +24 51.0           ~ 2 0
31 SDSS J100223.14+053444.7 G 10 02 23.14970 +05 34 44.7404           ~ 3 0
32 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 268 0
33 [SPG2012] 162.1+12.5+434 G? 10 48 25 +12 31.0           ~ 4 0
34 NGC 3389 GiG 10 48 27.9084984144 +12 31 59.659616244   12.0       ~ 244 2
35 HVC 250.1+57.4+139 HVC 11 09 29.8 +05 26 01           ~ 6 0
36 [SPG2012] 168.8+01.7+087 HI 11 15 13 +01 40.0           ~ 2 0
37 LEDA 1327584 G 11 26 20.1600759336 +07 39 45.076597236           ~ 8 0
38 [SPG2012] 172.2+06.4+181 G 11 28 52.08 +06 23 20.8           ~ 2 0
39 HVC 256.3+61.3+166 HVC 11 29 28.6 +06 09 23           ~ 3 0
40 HVC 277.2+65.1-140 HVC 12 09 20.0 +04 23 30           ~ 7 0
41 [SPG2012] 183.0+04.4-112 G? 12 12 10 +04 23.0           ~ 4 0
42 [DPP2015] 7 G 12 19 11.76 +05 40 09.1           ~ 4 0
43 AGC 226067 G 12 21 55.2 +13 28 10           ~ 24 0
44 AGC 227874 G 12 29 54 +07 58.0           ~ 16 0
45 [SPG2012] 187.9+05.0+028 G 12 31 40.56 +04 59 55.9           ~ 2 0
46 [SPG2012] 188.1+03.3+034 HI 12 32 30 +03 15.0           ~ 2 0
47 AGC 226165 G 12 34 33.84 +08 23 20.5           ~ 8 0
48 [SPG2012] 188.9+14.5+387 G? 12 35 26 +14 30.0           ~ 4 0
49 M 91 LIN 12 35 26.4446761320 +14 29 46.760333748   14.63 13.57     ~ 639 0
50 HVC 292.9+70.4+159 HVC 12 37 58.5 +07 48 49           ~ 4 0
51 AGC 226170 G 12 42 05.7 +09 54 14           ~ 6 0
52 [DPP2015] 69 G 12 45 23.76 +05 18 32.7           ~ 7 0
53 [SPG2012] 194.4+08.8+138 HVC 12 57 38 +08 47.0           ~ 2 0
54 LEDA 3801455 G 13 03 34.3622901072 +06 57 13.085162316           ~ 7 0
55 [DPP2015] 11 G 13 06 09.84 +06 30 24.9           ~ 4 0
56 AGC 233763 G 13 12 44.0 +13 31 18           ~ 7 0
57 Z 72-26 AG? 13 13 19.653 +10 11 38.53   15.2       ~ 37 0
58 AGC 233831 G 13 22 41.0 +11 52 05           ~ 7 0
59 HVC 326.9+65.2+316 HVC 13 30 43.8 +04 13 38           ~ 6 0
60 [SPG2012] 203.7+25.6-056 HI 13 34 46 +25 34.0           ~ 2 0
61 HVC 028.0+71.8-144 G 14 11 05.5 +24 11 36           ~ 7 0
62 HVC 353.4+61.0+257 HVC 14 19 48.6 +07 11 15           ~ 6 0
63 [SPG2012] 215.9+04.6+205 G? 14 23 26 +04 33.0           ~ 4 0
64 HVC 356.8+58.5+148 HVC 14 31 58.8 +06 35 20           ~ 6 0
65 LEDA 4433511 G 14 48 36.09165 +26 26 24.1225           ~ 8 0
66 HVC 005.5+52.0+163 HVC 15 04 41.3 +06 12 59           ~ 6 0
67 HVC 013.5+54.5+169 HVC 15 07 23.0 +11 32 56           ~ 6 0
68 AGC 258463 HI 15 07 50 +07 37.0           ~ 3 0
69 HVC 013.6+54.2+179 HVC 15 08 24.4 +11 24 22           ~ 6 0
70 HVC 013.6+53.7+222 HVC 15 10 00.6 +11 11 27           ~ 6 0
71 [SPG2012] 235.3+07.9-035 G 15 41 04.80 +07 54 45.3           ~ 2 0
72 [SPG2012] 235.3+05.6-089 G 15 41 12.906 +05 37 49.39           ~ 5 0
73 HVC 026.1+45.8+163 HVC 15 53 54.0 +14 41 48           ~ 5 0
74 SDSS J155509.50+143027.5 G 15 55 09.52539 +14 30 27.6809           ~ 11 0
75 HVC 029.5+43.8+175 HVC 16 05 29.4 +16 09 12           ~ 5 0
76 HVC 028.0+43.4+150 HVC 16 05 32.6 +14 59 20           ~ 7 0
77 HVC 028.4+43.1+177 HVC 16 07 07.0 +15 08 31           ~ 4 0
78 HVC 028.0+41.5+127 HVC 16 12 36.8 +14 12 26           ~ 5 0
79 HVC 028.6+40.3+125 HVC 16 17 45.3 +14 10 36           ~ 4 0
80 [SPG2012] 244.5+07.1-023 HI 16 18 10 +07 05.0           ~ 2 0
81 HVC 019.1+35.2-123 G 16 22 31.20 +05 10 03.4           ~ 5 0
82 HVC 027.8+38.2+124 HVC 16 24 43.4 +12 44 12           ~ 6 0
83 [SPG2012] 322.1+24.6+082 HI 21 28 14 +24 38.0           ~ 2 0
84 [SPG2012] 323.2+21.6-332 HVC 21 32 58 +21 38.0           ~ 2 0
85 [DPP2015] 40 G 21 43 46.8 +23 54 23           ~ 2 0
86 [SPG2012] 327.2+22.7-062 G 21 48 54.2 +22 40 13           ~ 2 0
87 HVC 084.0-17.9-311 HVC 21 54 06.2 +31 12 49           ~ 4 0
88 HVC 082.9-20.4-426 HVC 21 58 02.9 +28 37 35           ~ 4 0
89 [SPG2012] 329.8+22.3+071 HI 21 59 02 +22 17.0           ~ 2 0
90 AGC 321318 HVC 22 00 55.4 +24 45 10           ~ 5 0
91 HVC 086.1-21.3-277 HVC 22 11 21.8 +29 54 02           ~ 4 0
92 AGC 321320 HVC 22 12 27.6 +24 43 30           ~ 5 0
93 [DPP2015] 23 G 22 17 17.8 +21 12 13           ~ 2 0
94 AGC 321351 HVC 22 21 30.5 +24 36 58           ~ 5 0
95 [SPG2012] 339.0+09.0-237 G? 22 36 06 +09 02.0           ~ 4 0
96 HVC 092.5-23.0-311 HVC 22 38 23.4 +31 52 57           ~ 4 0
97 LAMOST J224651.84+074120.0 G 22 46 51.84 +07 41 20.2           ~ 5 0
98 [SPG2012] 342.1+20.6+208 G? 22 48 26 +20 33.0           ~ 4 0
99 [DPP2015] 48 G 22 54 54.24 +07 59 37.8           ~ 2 0
100 [DPP2015] 16 G 22 59 49.92 +07 01 43.5           ~ 4 0
101 [SPG2012] 347.9+13.0-345 HVC 23 11 42 +12 59.0           ~ 2 0
102 HVC 108.9-31.8-328 HVC 23 56 58.8 +29 32 35           ~ 4 0
103 HVC 109.0-31.5-324 HVC 23 57 02.1 +29 48 46           ~ 4 0
104 NAME Local Group GrG ~ ~           ~ 9325 0

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