2009A&A...505..663J


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.21CET11:34:53

2009A&A...505..663J - Astronomy and Astrophysics, volume 505, 663-671 (2009/10-2)

A Corona Australis cloud filament seen in NIR scattered light. II. Comparison with sub-millimeter data.

JUVELA M., PELKONEN V.-M. and PORCEDDU S.

Abstract (from CDS):

Dust emission and scattering provide tools for the study of interstellar clouds. Detailed knowledge of grain properties is essential for correct analysis of these observations. However, dust properties are suspected to change from diffuse to dense regions. The changes could affect our interpretation of observations from large scales (e.g., clump mass spectra) down to the structure of individual cores. We study a northern part of the Corona Australis molecular cloud that consists of a filament and a dense sub-millimetre core inside the filament. Our aim is to measure dust temperature and sub-mm emissivity within the region. We also look for confirmation that near-infrared (NIR) surface brightness can be used to study the structure of even very dense clouds. We extend our previous NIR mapping south of the filament. The dust colour temperatures are estimated using Spitzer 160µm and APEX/Laboca 870µm maps. The column densities derived based on the reddening of background stars, NIR surface brightness, and thermal sub-mm dust emission are compared. A three dimensional toy model of the filament is used to study the effect of anisotropic illumination on near-infrared surface brightness and the reliability of dust temperature determination. Relative to visual extinction, the estimated emissivity at 870µm is κ870=(1.3±0.4)x10–5mag–1. This is similar to the values found in diffuse medium. A significant increase in the sub-millimetre emissivity seems to be excluded. In spite of saturation, NIR surface brightness was able to accurately pinpoint, and better than measurements of the colour excesses of background stars, the exact location of the column density maximum. Both near- and far-infrared data show that the intensity of the radiation field is higher south of the filament.

Abstract Copyright:

Journal keyword(s): ISM: structure - ISM: clouds - submillimeter - infrared: ISM - dust, extinction - scattering

Simbad objects: 8

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Number of rows : 8

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 LDN 1642 MoC 04 35 18 -14 13.9           ~ 136 0
2 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3374 0
3 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1013 1
4 HD 176269 Y*O 19 01 03.2537135254 -37 03 39.304185611   6.54 6.69     B9V 54 0
5 V* S CrA TT* 19 01 08.597088 -36 57 19.89504   11.76 10.91 11.41   G0Ve+K0Ve 258 0
6 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 388 0
7 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 101 1
8 IC 5146 SFR 21 53 24 +47 16.0   7.82 7.2     ~ 380 2

    Equat.    Gal    SGal    Ecl

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2020.02.21-11:34:53

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