2019A&A...627A..58I


Query : 2019A&A...627A..58I

2019A&A...627A..58I - Astronomy and Astrophysics, volume 627A, 58-58 (2019/7-1)

Radio observations of evaporating objects in the Cygnus OB2 region.

ISEQUILLA N.L., FERNANDEZ-LOPEZ M., BENAGLIA P., ISHWARA-CHANDRA C.H. and DEL PALACIO S.

Abstract (from CDS):

We present observations of the Cygnus OB2 region obtained with the Giant Metrewave Radio Telescope (GMRT) at frequencies of 325 and 610 MHz. In this contribution we focus on the study of proplyd-like objects (also known as free-floating evaporating gas globules or frEGGs) that typically show an extended cometary morphology. We identify eight objects previously studied at other wavelengths and derive their physical properties by obtaining their optical depth at radio-wavelengths. Using their geometry and the photoionization rate needed to produce their radio-continuum emission, we find that these sources are possibly ionized by a contribution of the stars Cyg OB2 #9 and Cyg OB2 #22. Spectral index maps of the eight frEGGs were constructed, showing a flat spectrum in radio frequencies in general. We interpret these as produced by optically thin ionized gas, although it is possible that a combination of thermal emission, not necessarily optically thin, produced by a diffuse gas component and the instrument response (which detects more diffuse emission at low frequencies) can artificially generate negative spectral indices. In particular, for the case of the Tadpole we suggest that the observed emission is not of non-thermal origin despite the presence of regions with negative spectral indices in our maps.

Abstract Copyright: © ESO 2019

Journal keyword(s): ISM: individual objects: Cygnus OB2 - radio continuum: stars - stars: formation - stars: protostar

CDS comments: Section 4.1: the source GMRT 1 is not in SIMBAD, not enough information.

Simbad objects: 39

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Number of rows : 39
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 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2820 2
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4429 0
3 M 42 HII 05 35 17 -05 23.4           ~ 4083 0
4 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1154 1
5 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1014 2
6 NGC 3603 OpC 11 15 10.8 -61 15 32           ~ 1068 1
7 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3636 1
8 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4400 3
9 M 8 OpC 18 03 37 -24 23.2           ~ 614 1
10 GAL 005.97-01.17 HII 18 03 40.51 -24 22 44.4           ~ 33 0
11 CXR 9 PoC 20 30 02 +41 20.1           ~ 5 0
12 IRAS 20286+4105 HII 20 30 29.9 +41 15 51           ~ 54 1
13 NAME Cyg Complex reg 20 32 +45.0           ~ 602 0
14 NVSS J203201+413722 Rad 20 32 01.34 +41 37 22.7           ~ 3 0
15 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1942 2
16 F3R 2683 Rad 20 32 52.6 +41 40 14           ~ 3 0
17 Schulte 22 SB* 20 33 08.799 +41 13 18.21 14.33 13.59 11.55     O3If*+O6V((f)) 72 0
18 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O5I+O4III 232 0
19 IPHASX J203311.5+404141 ISM 20 33 11.5 +40 41 41           ~ 3 0
20 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 945 0
21 BD+40 4227A SB* 20 33 15.0781182864 +41 18 50.479292556 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 246 0
22 BLAST J203319+405858 mm 20 33 18.6870 +40 59 09.378           ~ 7 0
23 IRAS 20315+4046 IR 20 33 20.2 +40 56 53           ~ 3 0
24 19P 26 Rad 20 33 23.2 +41 27 24           ~ 4 0
25 RLP 841 ** 20 33 23.472072 +41 09 12.90312 14.97 14.23 11.83 10.98   O6IV((f)) 41 0
26 ECX6-27 HII 20 33 55.7 +41 22 46           ~ 26 1
27 IPHASX J203410.5+410659 ISM 20 34 10.5 +41 06 59           ~ 2 0
28 IRAS 20324+4057 Y*O 20 34 13.2517681008 +41 08 13.897348332           ~ 21 0
29 IPHASX J203419.0+410722 ISM 20 34 19.0 +41 07 22           ~ 2 0
30 IPHASX J203436.4+405154 ISM 20 34 36.4 +40 51 54           ~ 2 0
31 [RAB2011b] C62 smm 20 34 36.6 +40 51 47           ~ 2 0
32 IRAS 20328+4042 Y*O 20 34 43.26 +40 53 13.6           ~ 10 0
33 IRAS 20329+4104 IR 20 34 47.4 +41 14 45           ~ 3 0
34 IPHASX J203453.3+405321 ISM 20 34 53.3 +40 53 21           ~ 2 0
35 IPHASX J203453.6+404814 ISM 20 34 53.6 +40 48 14           ~ 2 0
36 NVSS J203500+413456 Rad 20 35 00.2 +41 34 55           ~ 5 1
37 18P 64 Rad 20 35 08.4 +41 13 20           ~ 24 0
38 3C 418.0 QSO 20 38 37.03472279 +51 19 12.6624988   21.30 21.00 18.9   ~ 312 0
39 ICRF J205252.0+363535 Sy2 20 52 52.05501061 +36 35 35.3005698   22.083   21.200   ~ 106 1

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