2014A&A...568L...3A


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.24CET01:24:51

2014A&A...568L...3A - Astronomy and Astrophysics, volume 568, L3-3 (2014/8-1)

A common column density threshold for scattering at 3.6 µm and water-ice in molecular clouds.

ANDERSEN M., THI W.-F., STEINACKER J. and TOTHILL N.

Abstract (from CDS):

Observations of scattered light in the 1-5µm range have revealed dust grains in molecular cores with sizes larger than commonly inferred for the diffuse interstellar medium. It is currently unclear whether these grains are grown within the molecular cores or are an ubiquitous component of the interstellar medium. We investigate whether the large grains necessary for efficient scattering at 1-5µm are associated with the abundance of water-ice within molecular clouds and cores. We combined water-ice abundance measurements for sight lines through the Lupus IV molecular cloud complex with measurements of the scattered light at 3.6µm for the same sight lines. We find that there is a similar threshold for the cores in emission in scattered light at 3.6µm (τ9.7=0.15±0.05, AK=0.4±0.2) as water-ice (τ9.7=0.11±0.01, AK=0.19±0.04) and that the scattering efficiency increases as the relative water-ice abundance increases. The ice layer increases the average grain size, which again strongly increases the albedo. The higher scattering efficiency is partly due to layering of ice on the dust grains. Although the layer can be relatively thin, it can enhance the scattering substantially.

Abstract Copyright:

Journal keyword(s): dust, extinction - ISM: clouds - stars: formation - scattering - ISM: lines and bands

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 695 1
2 2MASS J16000067-4204101 * 16 00 00.6764706934 -42 04 10.122098845           ~ 2 0
3 2MASS J16003535-4209337 IR 16 00 35.3560633154 -42 09 33.760612710           ~ 2 0
4 2MASS J16004739-4203573 IR 16 00 47.397 -42 03 57.37           ~ 3 0
5 2MASS J16005559-4159592 * 16 00 55.5986821422 -41 59 59.234396213           ~ 2 0
6 2MASS J16010642-4202023 * 16 01 06.4177494202 -42 02 02.387604951           ~ 3 0
7 2MASS J16012635-4150422 IR 16 01 26.3542304745 -41 50 42.289759233           ~ 3 0
8 2MASS J16012825-4153521 IR 16 01 28.2530180365 -41 53 52.256309148           ~ 3 0
9 2MASS J16014254-4153064 IR 16 01 42.541 -41 53 06.46           ~ 3 0
10 2MASS J16014426-4159364 IR 16 01 44.2647035330 -41 59 36.574551812           ~ 2 0
11 2MASS J16021102-4158468 * 16 02 11.0299234093 -41 58 46.828159490           ~ 3 0
12 2MASS J16022128-4158478 IR 16 02 21.2881451997 -41 58 47.862136437           ~ 3 0
13 2MASS J16024089-4203295 IR 16 02 40.9027440942 -42 03 29.479629459           ~ 2 0
14 NAME Lupus IV MoC 16 03 12.4 -42 07 43           ~ 132 0
15 LDN 260 DNe 16 46 58.2 -09 36 20           ~ 41 0

    Equat.    Gal    SGal    Ecl

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2021.01.24-01:24:51

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