1997A&A...327..299P


Query : 1997A&A...327..299P

1997A&A...327..299P - Astronomy and Astrophysics, volume 327, 299-308 (1997/11-1)

Sub-arcsec resolution infrared images of the star forming region G 35.20-1.74.

PERSI P., FELLI M., LAGAGE P.O., ROTH M. and TESTI L.

Abstract (from CDS):

We present J(1.25µm), H(1.65µm), K(2.2µm), H2(2.125µm) and 11.2µm infrared images at sub-arcsec resolution of an area centered around the star forming region G 35.20-1.74. In J, H and K a cluster of early type stellar sources with infrared excess clearly stands out with respect to the background distribution and is associated with a diffuse K emission around an UC HII region (which is the brightest source at K). No H2 emission is detected in narrow-band images at 2.125µm. At 11.2µm six components are detected. The brightest one (MIR3) is extended and coincides with the UC HII region. The source with steepest IR spectrum and the largest infrared excess (MIR1) is associated with an H2O maser and a near IR source detected only at K. It is separated from the IR cluster and at a distance of 20'' from the UC HII region. The IR emission comes from a local young stellar object (YSO) associated with the maser. The lack of radio continuum emission from MIR1 confirms that H2O masers can trace the youngest evolutionary stages of massive YSOs, much before the appearance of a radio UC HII region and shows that star formation is not limited to the IR cluster (where most probably it has already come to an end) but is still taking place in other parts of the molecular cloud. Of the other 11.2µm sources, three (MIR2, MIR4 and MIR5) present IR excesses and are similar to MIR1, while MIR6 appears to be a reddened early-type star. The morphology of the entire star forming complex, taking into account also molecular and sub-mm observations, is indicative of different and independent episodes of star formation taking place in the same molecular cloud.

Abstract Copyright:

Journal keyword(s): ISM: HII region - jets and outflows - molecules - G35.20 1.74 (GAL 35.20-1.74) - stars: formation - infrared: stars

Nomenclature: Table 1: [PFL97] NN (Nos 1-33), [PFL97] MIR N (Nos 1-6).

CDS comments: UC HII region = [HC96] G35.20-1.74

Simbad objects: 43

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Number of rows : 43
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 982 2
2 EM* LkHA 101 Em* 04 30 14.4355820328 +35 16 23.983198932   17.91 15.71 13.33   F 324 1
3 NGC 3567 GiP 11 11 18.6806299080 +05 50 10.606239960   14.4       ~ 21 0
4 [GRM93] G09.61+0.20 F Rad 18 06 14.89 -20 31 38.9           ~ 28 1
5 * eta Sgr LP? 18 17 37.6350518 -36 45 42.066723 6.37 4.67 3.11 1.55 0.23 M2III 139 0
6 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1545 0
7 [HC96] G35.20-1.74 2 Mas 19 01 43.163 +01 13 36.60           ~ 4 0
8 [PFL97] 2 IR 19 01 44.82 +01 13 37.4           ~ 1 0
9 2MASS J19014485+0114069 NIR 19 01 44.859 +01 14 06.99           ~ 1 0
10 2MASS J19014486+0112388 NIR 19 01 44.87 +01 12 38.8           ~ 1 0
11 [PFL97] 5 IR 19 01 45.00 +01 13 58.3           ~ 1 0
12 Caswell OH 035.200-01.736 Mas 19 01 45.5420 +01 13 32.690           ~ 12 0
13 [PFL97] 7 IR 19 01 45.69 +01 13 15.9           ~ 3 0
14 GAL 035.2-01.7 HII 19 01 46.50 +01 13 24.6           ~ 17 0
15 2MASS J19014653+0113116 NIR 19 01 46.53 +01 13 11.6           ~ 1 0
16 2MASS J19014655+0113476 NIR 19 01 46.558 +01 13 47.65           ~ 1 0
17 [PFL97] 10 IR 19 01 46.56 +01 12 48.8           ~ 1 0
18 [PFL97] 12 IR 19 01 46.70 +01 13 15.9           ~ 1 0
19 [PFL97] 13 IR 19 01 46.72 +01 13 36.0           ~ 1 0
20 [PFL97] 14 IR 19 01 46.75 +01 13 28.3           ~ 1 0
21 [PFL97] 15 IR 19 01 46.85 +01 13 33.3           ~ 1 0
22 [PFL97] 17 IR 19 01 46.87 +01 13 19.6           ~ 1 0
23 [PFL97] 18 IR 19 01 46.90 +01 13 12.4           ~ 1 0
24 [PFL97] 19 IR 19 01 46.92 +01 13 36.9           ~ 1 0
25 GAL 035.20-01.74 Y*O 19 01 47.0 +01 13 08           ~ 73 1
26 2MASS J19014695+0112573 NIR 19 01 46.96 +01 12 57.4           ~ 1 0
27 [PFL97] 20 IR 19 01 47.11 +01 13 34.6           ~ 1 0
28 [PFL97] 21 IR 19 01 47.19 +01 13 20.7           ~ 1 0
29 [PFL97] 22 IR 19 01 47.29 +01 13 52.9           ~ 1 0
30 [PFL97] 23 IR 19 01 47.36 +01 13 56.7           ~ 1 0
31 [PFL97] 24 IR 19 01 47.39 +01 13 36.5           ~ 1 0
32 GAL 035.19-01.75 HII 19 01 47.4 +01 13 00           ~ 24 0
33 [PFL97] 25 IR 19 01 47.65 +01 13 27.8           ~ 1 0
34 [PFL97] 26 IR 19 01 47.88 +01 13 29.8           ~ 1 0
35 [PFL97] 28 IR 19 01 47.98 +01 13 35.1           ~ 1 0
36 2MASS J19014801+0113199 NIR 19 01 48.01 +01 13 20.0           ~ 1 0
37 [PFL97] 29 IR 19 01 48.09 +01 13 26.0           ~ 1 0
38 [PFL97] 30 IR 19 01 48.27 +01 13 23.7           ~ 1 0
39 [PFL97] 31 IR 19 01 48.4 +01 13 21           ~ 1 0
40 [PFL97] 32 IR 19 01 48.55 +01 13 17.6           ~ 1 0
41 2MASS J19014866+0113295 NIR 19 01 48.67 +01 13 29.6           ~ 2 0
42 * gam Aql * 19 46 15.5802908 +10 36 47.740788 5.93 4.23 2.72 1.65 0.87 K3II 429 0
43 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 415 0

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2022.06.26-04:19:47

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