2015MNRAS.448.3731R

Query : 2015MNRAS.448.3731R

2015MNRAS.448.3731R - Mon. Not. R. Astron. Soc., 448, 3731-3746 (2015/April-3)

Local Group dSph radio survey with ATCA - I : observations and background sources.

REGIS M., RICHTER L., COLAFRANCESCO S., MASSARDI M., DE BLOK W.J.G., PROFUMO S. and ORFORD N.

Abstract (from CDS):

Dwarf spheroidal (dSph) galaxies are key objects in near-field cosmology, especially in connection to the study of galaxy formation and evolution at small scales. In addition, dSphs are optimal targets to investigate the nature of dark matter. However, while we begin to have deep optical photometric observations of the stellar population in these objects, little is known so far about their diffuse emission at any observing frequency, and hence on thermal and non-thermal plasma possibly residing within dSphs. In this paper, we present deep radio observations of six local dSphs performed with the Australia Telescope Compact Array (ATCA) at 16 cm wavelength. We mosaicked a region of radius of about 1 deg around three `classical' dSphs, Carina, Fornax, and Sculptor, and of about half of degree around three `ultrafaint' dSphs, BootesII, Segue2, and Hercules. The rms noise level is below 0.05 mJy for all the maps. The restoring beams full width at half-maximum ranged from 4.2arcsecx2.5 arcsec to 30.0arcsecx2.1 arcsec in the most elongated case. A catalogue including the 1392 sources detected in the six dSph fields is reported. The main properties of the background sources are discussed, with positions and fluxes of brightest objects compared with the FIRST, NVSS, and SUMSS observations of the same fields. The observed population of radio emitters in these fields is dominated by synchrotron sources. We compute the associated source number counts at 2 GHz down to fluxes of 0.25 mJy, which prove to be in agreement with AGN count models.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): catalogues - galaxies: dwarf - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/448/3731): table4.dat>

Nomenclature: Table 4: [RRC2015] JHHMMSS.s+DDMMss.s N=1834.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

CDS comments: Source FIRST J135946.5+134549 not identified.

Simbad objects: 112

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Number of rows : 112
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 PKS 0022-42 rG 00 24 42.98990924 -42 02 03.9490020   22       ~ 67 1
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NVSS J005700-335658 Rad 00 57 00.36 -33 56 58.5           ~ 2 1
4 NVSS J005732-341259 Rad 00 57 33.27 -34 13 05.7           ~ 2 1
5 NVSS J005747-335512 Rad 00 57 47.3 -33 55 14           ~ 2 1
6 NVSS J005805-334720 Rad 00 58 05.61 -33 47 25.0           ~ 2 1
7 NVSS J005806-330934 Rad 00 58 06.21 -33 09 34.9           ~ 1 0
8 NVSS J005817-330654 Rad 00 58 17.80 -33 06 54.1           ~ 1 0
9 NVSS J005842-330735 Rad 00 58 42.69 -33 07 35.2           ~ 1 0
10 NVSS J005847-333400 Rad 00 58 47.04 -33 34 00.3           ~ 1 0
11 NVSS J005858-334246 Rad 00 58 58.01 -33 42 50.5           ~ 2 1
12 NVSS J005900-331411 Rad 00 59 00.17 -33 14 11.4           ~ 1 0
13 NVSS J005900-334552 Rad 00 59 00.90 -33 45 52.1           ~ 1 0
14 [VV2000] J010009.0-333730 BLL 01 00 09.39096799 -33 37 31.9378506   20.3   19.4   ~ 30 0
15 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
16 [RRC2015] J010014.0-334442.7 Rad 01 00 14.00 -33 44 42.7           ~ 2 0
17 NVSS J010017-333843 Rad 01 00 17.42 -33 38 43.9           ~ 1 0
18 NVSS J010031-331034 Rad 01 00 31.6 -33 10 34           ~ 2 1
19 NVSS J010036-331646 Rad 01 00 36.72 -33 16 45.3           ~ 2 1
20 NVSS J010050-334434 Rad 01 00 50.25 -33 44 31.7           ~ 2 1
21 NVSS J010057-331856 Rad 01 00 57.95 -33 18 51.4           ~ 2 1
22 NVSS J010104-325856 Rad 01 01 04.45 -32 58 56.0           ~ 2 1
23 PKS J0100-3348 Rad 01 01 05.0 -33 47 36           ~ 2 1
24 NVSS J010123-333620 Rad 01 01 23.11 -33 36 11.6           ~ 2 1
25 NVSS J010126-330853 Rad 01 01 26.63 -33 08 55.8           ~ 2 1
26 NVSS J010149-335755 Rad 01 01 49.77 -33 57 54.4           ~ 2 1
27 NVSS J010154-335710 Rad 01 01 54.71 -33 57 09.1           ~ 2 1
28 NVSS J010154-330043 Rad 01 01 55.00 -33 00 45.7           ~ 2 1
29 NVSS J010204-330953 Rad 01 02 03.98 -33 09 54.0           ~ 2 1
30 NVSS J010222-335159 Rad 01 02 22.66 -33 51 56.3           ~ 2 1
31 NVSS J010234-334055 Rad 01 02 34.47 -33 40 57.2           ~ 2 1
32 NVSS J010310-340616 Rad 01 03 10.7 -34 06 17           ~ 2 1
33 NVSS J010317-335317 Rad 01 03 17.94 -33 53 14.0           ~ 2 1
34 NVSS J010324-333545 Rad 01 03 24.67 -33 35 45.9           ~ 1 0
35 NVSS J010340-335227 Rad 01 03 40.16 -33 52 26.7           ~ 2 1
36 QSO J0217+0144 Bla 02 17 48.95475095 +01 44 49.6990271   16.74 16.09 18.51 13.29 ~ 455 1
37 NVSS J021750+200330 Rad 02 17 50.81 +20 03 30.4           ~ 1 0
38 NVSS J021804+200543 rG 02 18 04.97166 +20 05 40.8310           ~ 1 0
39 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
40 NVSS J021925+195925 Rad 02 19 25.27 +19 59 25.7           ~ 1 0
41 NVSS J021938+200918 Rad 02 19 38.62 +20 09 18.0           ~ 1 0
42 NVSS J021952+200534 Rad 02 19 52.81 +20 05 34.6           ~ 1 0
43 4C 20.10 Rad 02 20 07.840 +20 35 40.16   17       ~ 12 1
44 NVSS J022014+202406 Rad 02 20 14.86 +20 24 06.3           ~ 1 0
45 NVSS J022016+201729 Rad 02 20 16.17 +20 17 29.8           ~ 1 0
46 NVSS J023737-335920 Rad 02 37 37.38 -33 59 20.3           ~ 1 0
47 NVSS J023848-343829 Rad 02 38 48.35 -34 38 23.2           ~ 2 1
48 NVSS J023903-343637 Rad 02 39 03.8 -34 36 43           ~ 2 1
49 NVSS J023916-345655 Rad 02 39 16.46 -34 56 56.9           ~ 2 1
50 NVSS J023918-341651 Rad 02 39 18.42 -34 16 49.9           ~ 2 1
51 NVSS J023924-335632 Rad 02 39 24.45 -33 56 32.1           ~ 1 0
52 NVSS J023932-344234 Rad 02 39 32.64 -34 42 31.2           ~ 2 1
53 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
54 NVSS J024007-342920 Rad 02 40 07.60 -34 29 23.3           ~ 2 1
55 QSO B0237-2322 QSO 02 40 08.1743783856 -23 09 15.729012036   16.78 16.63     ~ 516 1
56 LEDA 88016 Sy2 02 40 19.0142731104 -34 37 19.782630192   16.61 15.5 15.73   ~ 12 0
57 NVSS J024031-342132 Rad 02 40 31.15 -34 21 32.5           ~ 1 0
58 NVSS J024034-344430 Rad 02 40 34.4 -34 44 33           ~ 2 1
59 NVSS J024058-340257 Rad 02 40 59.23 -34 03 04.2           ~ 2 1
60 NVSS J024110-342444 Rad 02 41 10.27 -34 24 44.8           ~ 2 1
61 NVSS J024134-335100 Rad 02 41 34.88 -33 51 04.5           ~ 2 1
62 NVSS J024134-334203 Rad 02 41 35.16 -33 42 06.8           ~ 2 1
63 NVSS J024219-335933 Rad 02 42 19.96 -33 59 33.7           ~ 1 0
64 NVSS J024238-341710 Rad 02 42 38.93 -34 17 10.4           ~ 1 0
65 NVSS J024253-342345 Rad 02 42 53.53 -34 23 45.7           ~ 1 0
66 NVSS J024330-340819 Rad 02 43 30.13 -34 08 19.7           ~ 2 1
67 GLEAM J063614-504548 Rad 06 36 15.56 -50 45 42.5           ~ 2 1
68 GLEAM J063848-505939 Rad 06 38 48.53 -50 59 47.8           ~ 2 1
69 IRAS 06384-5122 Sy1 06 39 40.7696028168 -51 25 14.542837896   16.47 16.8 15.44   ~ 21 0
70 GLEAM J064019-505821 Rad 06 40 19.63 -50 58 17.1           ~ 2 1
71 GLEAM J064109-511733 Rad 06 41 09.50 -51 17 31.2           ~ 2 1
72 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
73 GLEAM J064208-505548 Rad 06 42 09.05 -50 56 06.4           ~ 2 1
74 GLEAM J064208-511122 Rad 06 42 09.52 -51 11 14.9           ~ 2 1
75 GLEAM J064214-510257 Rad 06 42 15.08 -51 02 55.1           ~ 2 1
76 GLEAM J064434-505438 Rad 06 44 36.44 -50 54 43.6           ~ 2 1
77 GLEAM J064528-510608 Rad 06 45 28.61 -51 06 19.7           ~ 2 1
78 GLEAM J064540-510040 Rad 06 45 41.75 -51 00 46.4           ~ 2 1
79 PKS 0647-475 rG 06 48 48.44999 -47 34 27.1813           ~ 24 1
80 ICRF J082526.8-501038 QSO 08 25 26.8673494560 -50 10 38.484054768   20.94       ~ 139 1
81 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
82 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
83 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
84 LEDA 49625 Sy2 13 57 13.0339288728 +12 54 21.260891412   16       ~ 10 0
85 [RRC2015] J135730.8+132222.6 AG? 13 57 30.8860 +13 22 24.449           ~ 2 0
86 [RRC2015] J135745.1+124314.2 AG? 13 57 45.0624 +12 43 14.575           ~ 2 0
87 NVSS J135758+132546 rG 13 57 58.64233 +13 25 47.7873           ~ 2 1
88 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
89 NVSS J135802+124521 rG 13 58 02.41177 +12 45 19.7539           ~ 1 0
90 FIRST J135818.7+131340 Rad 13 58 18.744 +13 13 40.90           ~ 1 0
91 NVSS J135956+124829 Rad 13 59 56.266 +12 48 33.22           ~ 2 1
92 FIRST J135956.4+125550 Rad 13 59 56.401 +12 55 50.49           ~ 1 0
93 FIRST J162902.1+124522 Rad 16 29 02.127 +12 45 22.43           ~ 1 0
94 FIRST J162939.2+130727 rG 16 29 39.29500 +13 07 27.7134           ~ 1 0
95 NVSS J163018+125016 Rad 16 30 18.32 +12 50 16.4           ~ 1 0
96 FIRST J163026.7+125832 Rad 16 30 26.738 +12 58 32.91           ~ 1 0
97 NVSS J163047+122711 Rad 16 30 47.07 +12 27 11.8           ~ 1 0
98 FIRST J163047.1+122711 Rad 16 30 47.178 +12 27 11.72           ~ 1 0
99 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
100 NVSS J163137+125217 Rad 16 31 37.42 +12 52 17.5           ~ 1 0
101 FIRST J163139.6+131114 Rad 16 31 39.608 +13 11 14.41           ~ 1 0
102 [RRC2015] J163146.2+125634.3 AG? 16 31 46.2407 +12 56 34.905           ~ 2 0
103 SDSS J163202.08+130911.5 rG 16 32 02.0842116336 +13 09 11.499249384           ~ 5 0
104 FIRST J163221.5+130021 Rad 16 32 21.554 +13 00 21.29           ~ 1 0
105 LEDA 1421789 rG 16 32 38.0439883871 +13 03 05.981027645           ~ 4 0
106 NVSS J163254+124034 Rad 16 32 54.46 +12 40 34.8           ~ 1 0
107 FIRST J163254.6+124035 Rad 16 32 54.687 +12 40 35.53           ~ 1 0
108 NVSS J163301+130549 Rad 16 33 01.168 +13 05 49.65           ~ 2 1
109 QSO B1705+0152 Bla 17 07 34.41527083 +01 48 45.6993042   18.5 18.9 18.52   ~ 108 1
110 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
111 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
112 NAME Local Group GrG ~ ~           ~ 9325 0

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