2011A&A...527A.141C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST21:46:51

2011A&A...527A.141C - Astronomy and Astrophysics, volume 527A, 141-141 (2011/3-1)

Variation of the extinction law in the Trifid nebula.

CAMBRESY L., RHO J., MARSHALL D.J. and REACH W.T.

Abstract (from CDS):

In the past few years, the extinction law has been measured in the infrared wavelengths for various molecular clouds and different laws have been obtained. In this paper we seek variations of the extinction law within the Trifid nebula region. Such variations would demonstrate local dust evolution linked to variation of the environment parameters such as the density or the interstellar radiation field. The extinction values, Aλ/AV, are obtained using the 2MASS, UKIDSS and Spitzer/GLIMPSE surveys. The technique is to inter-calibrate color-excess maps from different wavelengths to derive the extinction law and to map the extinction in the Trifid region. We measured the extinction law at 3.6, 4.5, and 5.8µm and we found a transition at AV≃20mag. Below this threshold the extinction law is as expected from models for RV=5.5 whereas above 20mag of visual extinction, it is flatter. Using these results the color-excess maps are converted into a composite extinction map of the Trifid nebula at a spatial resolution of 1 arcmin. A tridimensional analysis along the line-of-sight allowed us to estimate a distance of 2.7±0.5kpc for the Trifid. The comparison of the extinction with the 1.25mm emission suggests the millimeter emissivity is enhanced in the dense condensations of the cloud. Our results suggest a dust transition at large extinction which has not been reported so far as well as dust emissivity variations.

Abstract Copyright:

Journal keyword(s): dust, extinction - ISM: individual object: Trifid nebula - infrared: ISM - radio continuum: ISM

Simbad objects: 20

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Number of rows : 20

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 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1061 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3478 0
3 NAME Gal Anticenter reg 05 46 +28.9           ~ 720 0
4 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 848 1
5 NAME Cha Dark Cloud SFR 11 55 -78.0           ~ 556 1
6 NAME Nor Arm PoG 16 00 -50.0           ~ 338 0
7 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3027 0
8 LDN 1746 DNe 17 11.3 -27 22           ~ 108 0
9 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
10 [CLC98] TC5 PoC 18 01 57.65 -23 12 44.6           ~ 5 0
11 [CLC98] TC0 PoC 18 02 06.35 -22 57 13.6           ~ 5 0
12 [CLC98] TC3 PoC 18 02 07 -23 05.2           ~ 11 0
13 [CLC98] TC4 PoC 18 02 12.77 -23 05 46.7           ~ 12 0
14 HD 164492 ** 18 02 23.54916 -23 01 50.9468 6.49 7.49 6.80     O7.5Vz+A2Ia 193 0
15 M 20 OpC 18 02 42 -22 58.3           ~ 393 1
16 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 912 2
17 NAME Sgr Arm PoG 19 00 -30.0           ~ 523 1
18 LDN 663 DNe 19 36 55 +07 34.4           ~ 555 0
19 NAME Scutum Spiral Arm PoG ~ ~           ~ 275 0
20 NAME Galactic Bar reg ~ ~           ~ 892 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-21:46:51

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