2005A&A...435..131C


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST12:53:47

2005A&A...435..131C - Astronomy and Astrophysics, volume 435, 131-139 (2005/5-3)

Large-scale variations of the dust optical properties in the Galaxy.

CAMBRESY L., JARRETT T.H. and BEICHMAN C.A.

Abstract (from CDS):

We present an analysis of the dust optical properties at large scale, for the whole galactic anticenter hemisphere. We used the 2MASS Extended Source Catalog to obtain the total reddening on each galaxy line of sight and we compared this value to the IRAS 100µm surface brightness converted to extinction by Schlegel et al. (1998ApJ...500..525S). We performed a careful examination and correction of the possible systematic effects resulting from foreground star contamination, redshift contribution and galaxy selection bias. We also evaluated the contribution of dust temperature variations and interstellar clumpiness to our method. The correlation of the near-infrared extinction to the far-infrared optical depth shows a discrepancy for visual extinction greater than 1mag with a ratio AV(FIR)/AV(gal)=1.31±0.06. We attribute this result to the presence of fluffy/composite grains characterized by an enhanced far-infrared emissivity. Our analysis, applied to half of the sky, provides new insights on the dust grains nature suggesting fluffy grains are found not only in some very specific regions but in all directions for which the visual extinction reaches about 1mag.

Abstract Copyright:

Journal keyword(s): ISM: dust, extinction - galaxies: photometry - infrared: ISM

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 - 2021
#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3680 0
2 M 42 HII 05 35 17.3 -05 23 28           ~ 3787 0
3 NAME Ori A MoC 05 38 -07.1           ~ 2757 0
4 NAME Polaris Flare MoC 11 00 14.8 +86 10 52           ~ 168 1
5 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 712 0
6 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3156 1
7 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12110 0
8 NAME Aql Rift DNe 18 32 -01.0           ~ 263 1

    Equat.    Gal    SGal    Ecl

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2021.04.18-12:53:47

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