1999A&AS..138...71T


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.22CEST23:32:30

1999A&AS..138...71T - Astron. Astrophys., Suppl. Ser., 138, 71-85 (1999/July-0)

Young massive stars in the ISOGAL survey. I. VLA observations of the ISOGAL l=+45 field.

TESTI L., FELLI M. and TAYLOR G.B.

Abstract (from CDS):

We present VLA radio continuum observations at 3.6 and 6 cm of a ∼0.65 sq. deg. field in the galactic plane at l=+45°. These observations are meant to be used in a comparison with ISO observations at 7 and 15 µm of the same region. In this paper we compare the radio results with other radio surveys and with the IRAS-PSC. At 3.6 and/or 6 cm we detect a total of 34 discrete sources, 13 of which are found in five separate extended complexes. These are all multiple or single extended thermal ultra-compact HII (UCHII) regions. While for each of these complexes an IRAS counterpart could be reliably found, no IRAS counterpart could be reliably identified for any of the remaining 21 sources. Of these 21 compact sources, six are candidate UCHII regions, and the other 15 are most probably background extragalactic non-thermal sources. The five IRAS sources associated with the radio continuum complexes all satisfy the Wood & Churchwell (1989ApJ...340..265W; WC89) color criteria for UCHII. None of the other 38 IRAS point sources present in our surveyed field show the same colors. This fraction of WC89 type to total IRAS sources is consistent with what is found over the entire galactic plane. The fact that, when observed with a compact VLA configuration, the IRAS sources with ``UCHII colors'' are found to be associated with arcminute-scale extended sources, rather than with compact or unresolved radio sources, may have important implications on the estimated lifetime of UCHII regions.

Abstract Copyright:

Journal keyword(s): HII regions - galaxy: stellar content - stars: early-type - stars: formation - radio continuum: ISM

Nomenclature: Table 1: [TFT99] NN (Nos 1-34) = [TFT99] LLL.lll+B.bbb N=34.

Simbad objects: 37

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Number of rows : 37

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 [TFT99] 1 Rad 19 11 24.65 +10 50 20.7           ~ 1 0
2 [TFT99] 2 Rad 19 11 33.51 +10 50 02.8           ~ 1 0
3 [TFT99] 3 Rad 19 11 34.52 +10 48 46.0           ~ 1 0
4 [TFT99] 4 Rad 19 11 35.64 +10 51 05.3           ~ 1 0
5 NVSS J191156+104256 Rad 19 11 56.70 +10 42 53.5           ~ 1 0
6 [TFT99] 6 Rad 19 11 58.07 +11 05 32.9           ~ 1 0
7 [TFT99] 7 Rad 19 12 01.41 +10 48 09.0           ~ 1 0
8 [TFT99] 8 Rad 19 12 28.20 +10 46 43.2           ~ 1 0
9 NVSS J191236+104930 Rad 19 12 37.07 +10 49 27.1           ~ 1 0
10 [TFT99] 10 Rad 19 13 18.94 +10 48 16.5           ~ 1 0
11 2MASS J19132184+1050484 * 19 13 21.85 +10 50 48.4           O9.7 3 0
12 MSX6C G045.0711+00.1325 HII 19 13 22.0 +10 50 54           ~ 108 0
13 2MASS J19132208+1050538 * 19 13 22.09 +10 50 53.8           B0.2 3 0
14 [VGK2006] S 6 * 19 13 24.8656242700 +10 53 47.162462287           O9.5 2 0
15 NVSS J191326+105422 Rad 19 13 26.9 +10 54 31           ~ 3 1
16 NVSS J191327+105217 Rad 19 13 27.79 +10 52 08.9           ~ 2 0
17 2MASS J19132786+1053364 * 19 13 27.87 +10 53 36.4           O6 7 1
18 [VGK2006] S18 * 19 13 28.5989083402 +10 54 11.228188181           O9.7 2 0
19 [VGK2006] S19 * 19 13 28.9668741558 +10 53 55.979317571           O9.7 3 0
20 [ABJ2009] C45.48+0.13 MoC 19 14 09 +11 12.5           ~ 7 0
21 GAL 045.5+00.0 HII 19 14 20.8 +11 09 04           ~ 136 0
22 [GPD88] 045.454+0.060 HII 19 14 21.3 +11 09 13           ~ 148 1
23 [ERG2015] 6742 cor 19 14 25.1730 +11 09 27.759           ~ 16 0
24 [TFT99] 20 Rad 19 14 34.64 +10 38 28.7           ~ 1 0
25 [TFT99] 21 Rad 19 14 36.02 +10 33 37.7           ~ 1 0
26 [TFT99] 22 Rad 19 14 44.71 +10 57 56.7           ~ 1 0
27 [TFT99] 23 Rad 19 15 00.62 +10 56 17.6           ~ 1 0
28 [TFT99] 24 Rad 19 15 00.87 +10 56 09.7           ~ 1 0
29 [KC97c] G044.8-00.5 HII 19 15 04.3 +10 18 24           ~ 4 0
30 NVSS J191518+103042 Rad 19 15 18.34 +10 30 44.0           ~ 2 0
31 [TFT99] 26 Rad 19 15 29.98 +10 52 08.0           ~ 1 0
32 NVSS J191536+102630 Rad 19 15 36.30 +10 26 30.5           ~ 2 0
33 IRAS 19132+1035 Y*O 19 15 38.97768 +10 41 14.4276           ~ 40 0
34 F3R 1576 Rad 19 15 40.7 +10 50 53           ~ 2 0
35 [TFT99] 28 Rad 19 15 41.95 +10 27 38.0           ~ 1 0
36 F3R 1571 Rad 19 15 44.9 +10 41 15           ~ 2 0
37 GPSR 045.007-0.614 Rad 19 16 02.6 +10 27 20           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2019.07.22-23:32:30

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