2018A&A...610A..27M

Query : 2018A&A...610A..27M

2018A&A...610A..27M - Astronomy and Astrophysics, volume 610A, 27-27 (2018/2-1)

Richness of compact radio sources in NGC 6334D to F.

MEDINA S.-N.X., DZIB S.A., TAPIA M., RODRIGUEZ L.F. and LOINARD L.

Abstract (from CDS):

Context. The presence and properties of compact radio sources embedded in massive star forming regions can reveal important physical properties about these regions and the processes occurring within them. The NGC 6334 complex, a massive star forming region, has been studied extensively. Nevertheless, none of these studies has focused in its content in compact radio sources.
Aims. Our goal here is to report on a systematic census of the compact radio sources toward NGC 6334, and their characteristics. This will be used to attempt to define their very nature.
Methods. We used the VLA C band (4-8GHz) archive data with 0.36 (500AU) of spatial resolution and noise level of 50µJy/bm to carry out a systematic search for compact radio sources within NGC 6334. We also searched for infrared counterparts to provide some constraints on the nature of the detected radio sources.
Results. A total of 83 compact sources and three slightly resolved sources were detected. Most of them are here reported for the first time. We found that 29 of these 86 sources have infrared counterparts and three are highly variable. Region D contains 18 of these sources. The compact source toward the center, in projection, of region E is also detected.
Conclusions. From statistical analyses, we suggest that the 83 reported compact sources are real and most of them are related to NGC 6334 itself. A stellar nature for 27 of them is confirmed by their IR emission. Compared with Orion, region D suffers a deficit of compact radio sources. The infrared nebulosities around two of the slightly resolved sources are suggested to be warm dust, and we argue that the associated radio sources trace free-free emission from ionized material. We confirm the thermal radio emission of the compact source in region E. However, its detection at infrared wavelengths implies that it is located in the foreground of the molecular cloud. Finally, three strongly variable sources are suggested to be magnetically active young stars.

Abstract Copyright: © ESO 2018

Journal keyword(s): radio continuum: stars - stars: formation - radiation mechanisms: thermal - radiation mechanisms: non-thermal - techniques: interferometric

VizieR on-line data: <Available at CDS (J/A+A/610/A27): table1.dat table2.dat tablea1.dat>

Nomenclature: Table A.1: [MDT2018] VLA JHHMMSS.ss+DDMMSS.s N=83.

Simbad objects: 100

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Number of rows : 100
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 202 0
2 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4341 2
3 ICRF J171736.0-334208 BLL 17 17 36.02929270 -33 42 08.8296186   20.93   17.3   ~ 126 1
4 NGC 6334A HII 17 20 19.3 -35 54 55           ~ 121 0
5 [KRL2007b] 236 AGN 17 20 21.81 -35 52 48.2           ~ 110 0
6 [MDT2018] VLA J172028.97-354702.4 Rad 17 20 28.97 -35 47 02.4           ~ 1 0
7 [MDT2018] VLA J172029.78-355055.5 Rad 17 20 29.78 -35 50 55.5           ~ 1 0
8 [MDT2018] VLA J172030.69-354741.1 Rad 17 20 30.69 -35 47 41.1           ~ 1 0
9 GAL 351.31+00.6 HII 17 20 31 -35 51.6           ~ 46 0
10 [MDT2018] VLA J172031.18-355048.3 Rad 17 20 31.18 -35 50 48.3           ~ 1 0
11 2MASS J17203178-3551111 Y*O 17 20 31.7720826600 -35 51 11.312867016           O7 10 0
12 [MDT2018] VLA J172033.41-354542.5 Rad 17 20 33.41 -35 45 42.5           ~ 1 0
13 [MDT2018] VLA J172034.23-355051.6 Rad 17 20 34.23 -35 50 51.6           ~ 1 0
14 [MDT2018] VLA J172034.55-354645.9 Rad 17 20 34.55 -35 46 45.9           ~ 1 0
15 [MDT2018] VLA J172034.75-354543.9 Rad 17 20 34.75 -35 45 43.9           ~ 1 0
16 [MDT2018] VLA J172035.44-354336.9 Rad 17 20 35.44 -35 43 36.9           ~ 1 0
17 [MDT2018] VLA J172038.21-354846.8 Rad 17 20 38.21 -35 48 46.8           ~ 1 0
18 [MDT2018] VLA J172038.43-354838.9 Rad 17 20 38.43 -35 48 38.9           ~ 1 0
19 [MDT2018] VLA J172039.07-354912.3 Rad 17 20 39.07 -35 49 12.3           ~ 1 0
20 2MASS J17203909-3545108 Y*O 17 20 39.0881735568 -35 45 10.776989628           ~ 2 0
21 [MDT2018] VLA J172039.35-354656.3 Rad 17 20 39.35 -35 46 56.3           ~ 1 0
22 [MDT2018] VLA J172039.61-354935.7 Rad 17 20 39.61 -35 49 35.7           ~ 1 0
23 [MDT2018] VLA J172039.67-354632.5 Rad 17 20 39.67 -35 46 32.5           ~ 1 0
24 [MDT2018] VLA J172039.77-354309.2 Rad 17 20 39.77 -35 43 09.2           ~ 1 0
25 [MDT2018] VLA J172039.79-354906.7 Rad 17 20 39.79 -35 49 06.7           ~ 1 0
26 [MDT2018] VLA J172040.09-354852.7 Rad 17 20 40.09 -35 48 52.7           ~ 1 0
27 [MDT2018] VLA J172040.19-354845.2 Rad 17 20 40.19 -35 48 45.2           ~ 1 0
28 [MDT2018] VLA J172040.21-355059.3 Rad 17 20 40.21 -35 50 59.3           ~ 1 0
29 2MASS J17204040-3549438 Y*O 17 20 40.406 -35 49 43.81           ~ 4 0
30 [MDT2018] VLA J172040.84-354639.0 Rad 17 20 40.84 -35 46 39.0           ~ 1 0
31 [MDT2018] VLA J172040.87-355125.4 Rad 17 20 40.87 -35 51 25.4           ~ 1 0
32 [MDT2018] VLA J172040.89-354856.4 Rad 17 20 40.89 -35 48 56.4           ~ 1 0
33 [MDT2018] VLA J172041.26-354941.7 Rad 17 20 41.26 -35 49 41.7           ~ 1 0
34 2MASS J17204261-3548550 Y*O 17 20 42.611 -35 48 55.08           ~ 4 0
35 [MDT2018] VLA J172043.23-354902.2 Rad 17 20 43.23 -35 49 02.2           ~ 1 0
36 2MASS J17204345-3549172 Y*O 17 20 43.457 -35 49 17.23           ~ 8 0
37 [MDT2018] VLA J172043.76-355039.9 Rad 17 20 43.76 -35 50 39.9           ~ 1 0
38 [MDT2018] VLA J172043.92-354915.3 Rad 17 20 43.92 -35 49 15.3           ~ 1 0
39 NGC 6334D HII 17 20 44.2 -35 49 18           ~ 38 0
40 [MDT2018] VLA J172044.36-355027.2 Rad 17 20 44.36 -35 50 27.2           ~ 1 0
41 2MASS J17204466-3549168 Y*O 17 20 44.6704123968 -35 49 16.786349400           ~ 7 0
42 NAME NGC 6334-II Cl* 17 20 45 -35 49.4           ~ 31 1
43 [MDT2018] VLA J172045.47-354624.7 Rad 17 20 45.47 -35 46 24.7           ~ 1 0
44 [MDT2018] VLA J172046.42-354537.6 Rad 17 20 46.42 -35 45 37.6           ~ 1 0
45 [MDT2018] VLA J172046.82-354426.1 Rad 17 20 46.82 -35 44 26.1           ~ 1 0
46 [MDT2018] VLA J172047.65-354447.4 Rad 17 20 47.65 -35 44 47.4           ~ 1 0
47 2MASS J17204800-3549191 Y*O 17 20 48.0097378848 -35 49 19.154025372           ~ 5 0
48 [MDT2018] VLA J172048.27-355133.6 Rad 17 20 48.2784614328 -35 51 34.091675568           ~ 1 0
49 MIRES G351.4263+00.6726 Y*O 17 20 48.297 -35 45 37.03           ~ 4 0
50 [MDT2018] VLA J172048.64-354336.8 Rad 17 20 48.64 -35 43 36.8           ~ 1 0
51 [MDT2018] VLA J172049.16-354640.4 Rad 17 20 49.16 -35 46 40.4           ~ 1 0
52 2MASS J17205087-3546047 Y*O 17 20 50.880 -35 46 04.76           ~ 2 0
53 NGC 6334E HII 17 20 50.9 -35 46 06           ~ 52 0
54 [BHC2016] CM1 Rad 17 20 51.856 -35 47 04.48           ~ 4 0
55 2MASS J17205201-3549381 Y*O 17 20 52.013 -35 49 38.12           ~ 3 0
56 NGC 6334 HII 17 20 53 -36 07.9           ~ 682 0
57 [MDT2018] VLA J172053.26-354305.7 smm 17 20 53.26 -35 43 05.7           ~ 4 0
58 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 342 0
59 [BHC2016] CM2 Rad 17 20 53.384 -35 46 55.68           ~ 10 0
60 [BHC2016] MM1 cor 17 20 53.415 -35 46 57.88           ~ 93 0
61 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 230 1
62 [MDT2018] VLA J172053.65-354548.4 Rad 17 20 53.65 -35 45 48.4           ~ 1 0
63 NAME NGC 6334 I(N) smm 17 20 54 -35 45.0           ~ 151 1
64 SSTGLMC G351.4349+00.6551 Y*O 17 20 54.016 -35 45 47.66           ~ 2 0
65 [HBC2014] H2O-C4 cm 17 20 54.149 -35 45 13.70           ~ 2 0
66 [MDT2018] VLA J172054.19-354554.0 Rad 17 20 54.19 -35 45 54.0           ~ 1 0
67 [MDT2018] VLA J172054.26-355106.5 Rad 17 20 54.26 -35 51 06.5           ~ 1 0
68 CXOU J172054.3-354358 Y*O 17 20 54.360 -35 43 58.46           ~ 4 0
69 [MDT2018] VLA J172054.60-354516.9 Rad 17 20 54.60 -35 45 16.9           ~ 1 0
70 MMB G351.445+00.660 cor 17 20 54.61 -35 45 08.6           ~ 48 0
71 [HBC2014] VLA 2 cm 17 20 54.871 -35 45 36.49           ~ 2 0
72 [HBM2006b] I(N)-SMA1b mm 17 20 55.19 -35 45 03.8           ~ 12 0
73 [MDT2018] VLA J172055.34-354758.7 Rad 17 20 55.34 -35 47 58.7           ~ 1 0
74 [MDT2018] VLA J172056.41-354921.0 Rad 17 20 56.41 -35 49 21.0           ~ 1 0
75 2MASS J17205646-3548228 Y*O 17 20 56.4632769480 -35 48 22.611725172           ~ 3 0
76 [MDT2018] VLA J172056.96-354436.8 Rad 17 20 56.96 -35 44 36.8           ~ 1 0
77 [MDT2018] VLA J172057.62-354632.0 Rad 17 20 57.62 -35 46 32.0           ~ 1 0
78 [MDT2018] VLA J172057.98-354431.6 Rad 17 20 57.98 -35 44 31.6           ~ 1 0
79 [MDT2018] VLA J172058.14-354934.6 Rad 17 20 58.14 -35 49 34.6           ~ 1 0
80 [MDT2018] VLA J172059.98-354947.5 Rad 17 20 59.98 -35 49 47.5           ~ 1 0
81 [MDT2018] VLA J172100.08-354743.9 Rad 17 21 00.08 -35 47 43.9           ~ 1 0
82 [MDT2018] VLA J172100.80-354626.5 Rad 17 21 00.80 -35 46 26.5           ~ 1 0
83 [MDT2018] VLA J172101.31-355014.2 Rad 17 21 01.31 -35 50 14.2           ~ 1 0
84 [MDT2018] VLA J172101.45-354534.0 Rad 17 21 01.45 -35 45 34.0           ~ 1 0
85 [MDT2018] VLA J172101.62-355106.2 Rad 17 21 01.62 -35 51 06.2           ~ 1 0
86 [MDT2018] VLA J172101.80-355106.4 Rad 17 21 01.80 -35 51 06.4           ~ 1 0
87 [MDT2018] VLA J172103.47-354618.8 Rad 17 21 03.47 -35 46 18.8           ~ 1 0
88 [MDT2018] VLA J172104.10-354540.5 Rad 17 21 04.10 -35 45 40.5           ~ 1 0
89 [MDT2018] VLA J172104.55-355033.1 Rad 17 21 04.55 -35 50 33.1           ~ 1 0
90 [MDT2018] VLA J172108.98-354714.4 Rad 17 21 08.98 -35 47 14.4           ~ 1 0
91 [MDT2018] VLA J172108.98-354153.8 Rad 17 21 08.98 -35 41 53.8           ~ 1 0
92 [MDT2018] VLA J172112.53-354921.4 Rad 17 21 12.53 -35 49 21.4           ~ 1 0
93 [MDT2018] VLA J172115.62-354548.6 Rad 17 21 15.62 -35 45 48.6           ~ 1 0
94 [MDT2018] VLA J172116.19-354554.1 Rad 17 21 16.19 -35 45 54.1           ~ 1 0
95 [MDT2018] VLA J172116.20-354627.6 Rad 17 21 16.20 -35 46 27.6           ~ 1 0
96 [MDT2018] VLA J172117.26-354823.5 Rad 17 21 17.26 -35 48 23.5           ~ 1 0
97 [MDT2018] VLA J172118.37-355032.2 Rad 17 21 18.37 -35 50 32.2           ~ 1 0
98 [MDT2018] VLA J172118.54-354959.6 Rad 17 21 18.54 -35 49 59.6           ~ 1 0
99 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1613 0
100 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 868 0

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