2008A&A...490..655V


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.26CET01:22:25

2008A&A...490..655V - Astronomy and Astrophysics, volume 490, 655-664 (2008/11-1)

Characterizing star formation activity in infrared dark cloud MSXDC G048.65-00.29.

VAN DER WIEL M.H.D. and SHIPMAN R.F.

Abstract (from CDS):

Infrared dark clouds (IRDCs), condensed regions of the ISM with high column densities, low temperatures and high masses, are suspected sites of star formation. Thousands of IRDCs have already been identified. To date, it has not been resolved whether IRDCs always show star formation activity and, if so, if massive star formation (>8M) is the rule or the exception in IRDCs. Previous analysis of sub-millimeter cores in the cloud MSXDC G048.65-00.29 (G48.65) indicates embedded star formation activity. To characterize this activity in detail, mid-infrared photometry (3-30µm) has been obtained with the Spitzer Space Telescope. This paper analyzes the point sources seen in the 24µm band, combined with counterparts or upper limits at shorter and longer wavelengths. Data points in wavelength bands ranging from 1µm up to 850µm (Spitzer IRAC, MIPS 24 and 70µm, archival 2MASS data and sub-millimeter counterparts) are used to compare each 24µm source to a set of Spectral Energy Distributions of Young Stellar Object (YSO) models. By assessing the models that fit the data, an attempt is made to identify YSOs as such and determine their evolutionary stages and stellar masses. A total of 17 sources are investigated, 13 of which are classified as YSOs, primarily - but not exclusively - in an early embedded phase of star formation. The modeled masses of the central stellar objects range from sub-solar to ∼8M. Every YSO is at less than 1 pc projected distance from its nearest YSO neighbor. IRDC G48.65 is a region of active star formation. We find YSOs in various evolutionary phases, indicating that the star formation in this cloud is not an instantaneous process. The inferred masses of the central objects suggest that this IRDC hosts only low to intermediate mass YSOs and none with masses exceeding ∼8M.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: formation - ISM: clouds - ISM: individual objects: MSXDC G048.65-00.29

Nomenclature: Table 1: [VS2008] SNN (Nos S1-S20). Table 1, col(SCUBA): [OSO2005] PN (No. P3) added.

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 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11935 0
2 [VS2008] S3 Y*O 19 21 34.4 +13 48 19           ~ 2 0
3 2MASS J19213444+1349122 Y*O 19 21 34.45 +13 49 12.2           ~ 2 0
4 2MASS J19213593+1352007 Y*O 19 21 35.94 +13 52 00.7           ~ 3 0
5 [VS2008] S11 Y*O 19 21 36.2 +13 52 21           ~ 2 0
6 2MASS J19213739+1351238 Y*O 19 21 37.3922593023 +13 51 23.815265075           ~ 3 0
7 2MASS J19214066+1350547 Y*O 19 21 40.66 +13 50 54.7           ~ 3 0
8 2MASS J19214073+1351176 Y*O 19 21 40.73 +13 51 17.6           ~ 1 0
9 [VS2008] S20 Y*O 19 21 40.8 +13 52 36           ~ 2 0
10 2MASS J19214228+1350212 Y*O 19 21 42.29 +13 50 21.2           ~ 2 0
11 [VS2008] S12 Y*O 19 21 44.7 +13 49 26           ~ 5 0
12 NAME W51 IR Dark Cloud cor 19 21 45.3 +13 49 22           ~ 19 0
13 2MASS J19214807+1351249 Y*O 19 21 48.07 +13 51 24.9           ~ 2 0
14 2MASS J19214875+1351034 Y*O 19 21 48.7552599874 +13 51 03.468034692           ~ 2 0
15 [VS2008] S15 Y*O 19 21 49.1598 +13 49 26.909           ~ 12 0
16 2MASS J19214945+1351581 Y*O 19 21 49.4580300548 +13 51 58.153754295           ~ 2 0
17 [VS2008] S5 Y*O 19 21 49.6 +13 49 31           ~ 2 1
18 AGAL G048.669-00.304 Y*O 19 21 49.9 +13 49 35           ~ 8 0
19 [VS2008] S1 Y*O 19 21 50.1 +13 47 57           ~ 2 0
20 [VS2008] S6 Y*O 19 21 50.22 +13 49 39.3           ~ 4 1
21 2MASS J19215022+1348185 Y*O 19 21 50.23 +13 48 18.5           ~ 3 0
22 SSTOERC G048.6400-00.3225 Y*O 19 21 50.49 +13 47 27.8           ~ 2 0
23 [VS2008] S10 Y*O 19 21 52.1 +13 52 24           ~ 2 0
24 W 51 SNR 19 23 50 +14 06.0           ~ 1167 1

    Equat.    Gal    SGal    Ecl

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