2002A&A...381..628M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.24CEST02:53:30

2002A&A...381..628M - Astronomy and Astrophysics, volume 381, 628-652 (2002/1-2)

Gas and dust emission in the Lupus globular filaments GF 17 and GF 20.

MOREIRA M.C. and YUN J.L.

Abstract (from CDS):

We present large-scale millimeter molecular line observations as well as IRAS co-added images of the globular filaments GF 17 and GF 20 in the southern constellation of Lupus. A comparison is made of the extended far-infrared emission detected by IRAS at 60 and 100µm and the CO(1-0), 13CO(1-0), and C18O(1-0) emission in GF 17 and GF 20. Based on the far-infrared emission estimates of the dust temperature, optical depth and visual extinction are derived. We find a correlation between the measured dispersion in our extinction determinations and the extinction toward the clouds, which is very similar to that found for other clouds, and interpret this as evidence that the cloud edges are characterized by a smooth density gradient. We find a remarkably good agreement between our 100µm optical depth images and the 13CO integrated emission maps. The dust 100µm optical depth is well correlated with the gas column density suggesting that the far-infrared emission must originate from a substantial depth in the clouds. The dust temperature is found to be anticorrelated with the gas column density indicating that these clouds are heated externally. Our calculated far-infrared luminosities of GF 17 and GF 20 imply that the dominant source of dust heating is the ISRF due to the nearby Sco OB2 association. Analysis of the gas velocity structure within GF 17 and GF 20 reveals evidence for smooth large-scale streaming motions along the filamentary structures with magnitude ∼0.5km/s/pc. Our results indicate that the velocity gradients are likely due to the interaction of GF 17 and GF 20 with the Upper-Scorpius and Upper-Centaurus-Lupus HI expanding shells, via propagating shock fronts.

Abstract Copyright:

Journal keyword(s): interstellar medium: clouds - interstellar medium: dust, extinction - interstellar medium: individual objects: Lupus clouds - interstellar medium: structure - interstellar medium: molecules

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 - 2019
#notes
1 V* R Dor AB* 04 36 45.59127 -62 04 37.7974 7.84 6.98 5.40 2.71 -0.44 M8III:e 271 0
2 * L02 Pup AB* 07 13 32.3181035 -44 38 23.062946 7.90 6.66 5.10 2.49 0.07 M5IIIe 186 0
3 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 590 0
4 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 342 1
5 V* RU Lup TT* 15 56 42.3109948086 -37 49 15.473469159 9.27 10.07 9.60     K7/M0e 368 0
6 GF 20 ISM 15 58 00.0 -37 42 47           ~ 2 0
7 GF 17 ISM 16 01 48.6 -41 51 21           ~ 4 0
8 NAME Lup Cloud SFR 16 03 -38.1           ~ 481 0
9 NAME Lupus III SFR 16 09.6 -39 03           ~ 262 0
10 NAME Upper Sco Association As* 16 12 -23.4           ~ 959 1
11 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1078 1
12 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2930 0
13 V* VX Sgr s*r 18 08 04.0431479808 -22 13 26.629744195 11.72 9.41 6.52 3.90 2.11 M8.5Ia 538 0
14 LDN 977 DNe 21 39.0 +43 14           ~ 35 0
15 IC 5146 SFR 21 53 24 +47 16.0   7.82 7.2     ~ 374 2

    Equat.    Gal    SGal    Ecl

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2019.10.24-02:53:30

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