2016A&A...588A..30S


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.15CEST20:45:07

2016A&A...588A..30S - Astronomy and Astrophysics, volume 588A, 30-30 (2016/4-1)

Dust emissivity in the star-forming filament OMC 2/3.

SADAVOY S.I., STUTZ A.M., SCHNEE S., MASON B.S., DI FRANCESCO J. and FRIESEN R.K.

Abstract (from CDS):

We present new measurements of the dust emissivity index, β, for the high-mass, star-forming OMC 2/3 filament. We combined 160-500µm data from Herschel with long-wavelength observations at 2mm and fit the spectral energy distributions across a ≃2pc long, continuous section of OMC 2/3 at 15000AU (0.08pc) resolution. With these data, we measured β and reconstructed simultaneously the filtered-out large-scale emission at 2mm. We implemented both variable and fixed values of β, finding that β=1.7-1.8 provides the best fit across most of OMC 2/3. These β values are consistent with a similar analysis carried out with filtered Herschel data. Thus, we show that β values derived from spatial filtered emission maps agree well with those values from unfiltered data at the same resolution. Our results contradict the very low β values (∼0.9) previously measured in OMC 2/3 between 1.2mm and 3.3mm data, which we attribute to elevated fluxes in the 3.3mm observations. Therefore, we find no evidence of rapid, extensive dust grain growth in OMC 2/3. Future studies with Herschel data and complementary ground-based long-wavelength data can apply our technique to obtain reliable determinations of β in nearby cold molecular clouds.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: formation - dust, extinction - ISM: clouds - submillimeter: ISM

VizieR on-line data: <Available at CDS (J/A+A/588/A30): table1.dat list.dat fits/*>

Simbad objects: 24

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Number of rows : 24

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 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 277 0
2 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1057 2
3 [TUK93] 3 Y*O 05 35 18.32712 -05 00 32.9400           ~ 59 2
4 V* V2358 Ori Or* 05 35 19.82376 -05 15 35.3304           ~ 22 0
5 2MASS J05351997-0501024 Y*O 05 35 19.97 -05 01 02.5           ~ 30 0
6 HOY J053521.34-051319.5 cor 05 35 21.4 -05 13 14           ~ 26 0
7 [TSO2008] 13 Y*O 05 35 22.4451 -05 01 14.123           ~ 47 1
8 [TSO2008] 34 IR 05 35 23.4 -05 12 36           ~ 11 0
9 2MASS J05352341-0512023 Y*O 05 35 23.417 -05 12 02.34           ~ 25 0
10 [TSO2008] 14 mm 05 35 23.420 -05 01 30.35           ~ 62 0
11 [SMD2014] 083.8513-05.1419 Y*O 05 35 24.2999 -05 08 30.686           ~ 50 0
12 [TSO2008] 18 mm 05 35 26.0 -05 05 42           ~ 40 1
13 JCMTSF J053526.4-050521 mm 05 35 26.5 -05 05 17           ~ 25 1
14 IRAS 05329-0505 Y*O 05 35 26.746 -05 03 55.08           ~ 74 0
15 V* V2457 Ori Or* 05 35 26.97000 -05 09 54.4644         18.858 ~ 125 0
16 OMC 2 MoC 05 35 27 -05 10.1           ~ 405 1
17 2MASS J05352762-0509337 Y*O 05 35 27.622 -05 09 33.78           ~ 75 0
18 [SKN2015] AzTEC-Ori 337 cor 05 35 29.4 -04 58 31           ~ 13 0
19 JCMTSF J053530.0-045944 Y*? 05 35 30.6 -04 59 49           ~ 6 0
20 M 43 HII 05 35 31 -05 16.2           ~ 165 0
21 [CRW97] OMC-3 MMS 10 cor 05 35 31.91 -05 05 51.1           ~ 29 0
22 NAME OMC-2/3 reg 05 35 33.0 -05 00 32           ~ 62 0
23 NAME Ori A MoC 05 38 -07.1           ~ 2760 0
24 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 905 1

    Equat.    Gal    SGal    Ecl

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