2003A&A...398..589V


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.14CET19:08:17

2003A&A...398..589V - Astronomy and Astrophysics, volume 398, 589-605 (2003/2-1)

Far and mid infrared observations of two ultracompact HII regions and one compact CO clump.

VERMA R.P., GHOSH S.K., MOOKERJEA B. and RENGARAJAN T.N.

Abstract (from CDS):

Two ultracompact HII regions (IRAS 19181+1349 and 20178+4046) and one compact molecular clump (20286+4105) have been observed at far infrared wavelengths using the TIFR 1 m balloon-borne telescope and at mid infrared wavelengths using ISO. Far infrared observations have been made simultaneously in two bands with effective wavelengths of ∼150 and ∼210µm, using liquid 3He cooled bolometer arrays. ISO observations have been made in seven spectral bands using the ISOCAM instrument; four of these bands cover the emission from Polycyclic Aromatic Hydrocarbon (PAH) molecules. In addition, IRAS survey data for these sources in the four IRAS bands have been processed using the HIRES routine. In the high resolution mid infrared maps as well as far infrared maps multiple embedded energy sources have been resolved. There are structural similarities between the images in the mid infrared and the large scale maps in the far infrared bands, despite very different angular resolutions of the two. Dust temperature and optical depth (τ150) maps have also been generated using the data from balloon-borne observations. Spectral energy distributions (SEDs) for these sources have been constructed by combining the data from all these observations. Radiation transfer calculations have been made to understand these SEDs. Parameters for the dust envelopes in these sources have been derived by fitting the observed SEDs. In particular, it has been found that the radial density distribution for three sources is different. Whereas in the case of IRAS 20178+4046 a steep distribution of the form r–2 is favoured, for IRAS 20286+4105 it is r–1 and for IRAS 19181+1349 it is a uniform distribution (r0). Line ratios for PAH bands have generally been found to be similar to those for other compact HII regions but different to general HII regions.

Abstract Copyright:

Journal keyword(s): infrared: ISM - ISM: HII regions - ISM: individual objects: IRAS 19181+1349, IRAS 20178+4046, IRAS 20286+4105

Nomenclature: Table 2: [VGM2003] IRAS 19181+1349 W (Nos E, W). Table 3: [VGM2003] ISO HHMMSS.s+DDMMSSS N=15. Table 4: [VGM2003] IRAS 20286+4105 W (Nos N, S).

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IRAS 19175+1357 cor 19 19 49.22 +14 02 46.8           ~ 23 0
2 IRAS 19176+1359 Y*? 19 19 55.50936 +14 04 58.2708           ~ 4 0
3 [VGM2003] ISO 191805.4+134922 IR 19 20 23.6 +13 55 02           ~ 1 0
4 [VGM2003] ISO 191805.8+135032 IR 19 20 24.0 +13 56 12           ~ 1 0
5 [VGM2003] ISO 191806.8+134940 IR 19 20 25.0 +13 55 20           ~ 1 0
6 [VGM2003] IRAS 19181+1349 W IR 19 20 25.6 +13 55 19           ~ 1 0
7 [VGM2003] ISO 191807.6+134854 IR 19 20 25.8 +13 54 34           ~ 1 0
8 [VGM2003] ISO 191811.2+134933 IR 19 20 29.4 +13 55 13           ~ 1 0
9 [VGM2003] ISO 191812.2+135052 IR 19 20 30.4 +13 56 32           ~ 1 0
10 [VGM2003] ISO 191812.5+135124 IR 19 20 30.7 +13 57 04           ~ 1 0
11 [VGM2003] ISO 191812.6+135010 IR 19 20 30.8 +13 55 50           ~ 1 0
12 [VGM2003] IRAS 19181+1349 E IR 19 20 30.9 +13 55 35           ~ 1 0
13 [VGM2003] ISO 191813.0+134959 IR 19 20 31.2 +13 55 39           ~ 1 0
14 GAL 048.61+00.02 HII 19 20 31.3 +13 55 24           ~ 50 0
15 [VGM2003] ISO 191813.5+134924 IR 19 20 31.7 +13 55 04           ~ 1 0
16 IRAS 20178+4046 HII 20 19 39.3 +40 56 30           ~ 44 1
17 [VGM2003] ISO 201753.3+404703 IR 20 19 39.5 +40 56 33           ~ 1 0
18 2MASS J20194120+4056303 IR 20 19 41.21 +40 56 30.3           ~ 1 0
19 2MASS J20302731+4115273 * 20 30 27.3111516884 +41 15 27.283095062           ~ 2 0
20 2MASS J20302733+4116000 Y*O 20 30 27.336 +41 16 00.04           ~ 7 0
21 [VGM2003] ISO 202842.5+410544 Y*O 20 30 29.266 +41 15 57.91           ~ 2 0
22 MITG J203029+4115 mul 20 30 29.9 +41 15 51           ~ 49 1

    Equat.    Gal    SGal    Ecl

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2019.12.14-19:08:17

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