2014ApJ...791..108F

Query : 2014ApJ...791..108F

2014ApJ...791..108F - Astrophys. J., 791, 108 (2014/August-3)

Distributed low-mass star formation in the IRDC G34.43+00.24.

FOSTER J.B., ARCE H.G., KASSIS M., SANHUEZA P., JACKSON J.M., FINN S.C., OFFNER S., SAKAI T., SAKAI N., YAMAMOTO S., GUZMAN A.E. and RATHBORNE J.M.

Abstract (from CDS):

We have used deep near-infrared observations with adaptive optics to discover a distributed population of low-mass protostars within the filamentary Infrared Dark Cloud G34.43+00.24. We use maps of dust emission at multiple wavelengths to determine the column density structure of the cloud. In combination with an empirically verified model of the magnitude distribution of background stars, this column density map allows us to reliably determine overdensities of red sources that are due to embedded protostars in the cloud. We also identify protostars through their extended emission in the K band, which comes from excited H2 in protostellar outflows or reflection nebulosity. We find a population of distributed low-mass protostars, suggesting that low-mass protostars may form earlier than, or contemporaneously with, high-mass protostars in such a filament. The low-mass protostellar population may also produce the narrow line-width SiO emission observed in some clouds without high-mass protostars. Finally, we use a molecular line map of the cloud to determine the virial parameter per unit length along the filament and find that the highest mass protostars form in the most bound portion of the filament, as suggested by theoretical models.

Abstract Copyright: ∼

Journal keyword(s): ISM: clouds - ISM: jets and outflows - stars: low-mass - stars: massive - stars: pre-main sequence - stars: protostars

Nomenclature: Table 2: [FAK2014] KN (Nos K1-K9). Table 3: [FAK2014] A (Nos A-C).

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
3 [RJS2006] MSXDC G034.43+00.24 MM8 mm 18 53 16.4 +01 26 20           ~ 35 0
4 [SPW2007] 42 Y*? 18 53 16.91 +01 26 32.0           ~ 2 0
5 [FAK2014] K1 NIR 18 53 16.990 +01 26 41.28           ~ 1 0
6 2MASS J18531730+0126400 Y*O 18 53 17.3111917104 +01 26 39.772726944           ~ 3 0
7 SSTGLMC G034.4266+00.2460 Y*O 18 53 17.32 +01 26 33.0           ~ 2 0
8 [FAK2014] K2 NIR 18 53 17.350 +01 26 33.00           ~ 1 0
9 AGAL G034.411+00.234 Y*O 18 53 18.0319 +01 25 25.500           ~ 108 0
10 [FAK2014] C As* 18 53 18.190 +01 25 06.96           ~ 1 0
11 [RJS2006] MSXDC G034.43+00.24 MM7 mm 18 53 18.3 +01 27 13           ~ 37 0
12 [ZYL2017] G34-9 MoC 18 53 18.51 +01 28 30.5           ~ 31 0
13 AGAL G034.401+00.226 cor 18 53 18.6 +01 24 40           ~ 74 1
14 MSXDC G034.43+00.24 MoC 18 53 18.9 +01 26 39           ~ 122 0
15 [BT2009] F6 mm 18 53 19.0 +01 24 08           ~ 31 0
16 [FAK2014] K3 NIR 18 53 19.660 +01 28 16.68           ~ 1 0
17 [SPW2007] 50 Y*? 18 53 19.90 +01 28 08.6           ~ 2 0
18 [FAK2014] K4 NIR 18 53 19.920 +01 28 08.04           ~ 1 0
19 [SPW2007] 27 Y*O 18 53 20.01 +01 28 19.6           ~ 3 0
20 [FAK2014] K5 NIR 18 53 20.020 +01 28 19.56           ~ 1 0
21 [FAK2014] K6 NIR 18 53 20.020 +01 28 27.84           ~ 1 0
22 [FAK2014] K7 NIR 18 53 20.040 +01 28 14.16           ~ 1 0
23 [FAK2014] B As* 18 53 20.040 +01 28 19.20           ~ 1 0
24 [FAK2014] K8 NIR 18 53 20.060 +01 28 23.88           ~ 1 0
25 AGAL G034.459+00.247 Y*O 18 53 20.4 +01 28 23           ~ 71 0
26 [FAK2014] A As* 18 53 20.500 +01 26 37.32           ~ 1 0
27 [FAK2014] K9 NIR 18 53 20.500 +01 28 36.84           ~ 1 0
28 [SPW2007] 29 Y*O 18 53 20.67 +01 28 24.1           ~ 3 0
29 IRAS 19181+1349 HII 19 20 30.95 +13 55 26.7           ~ 54 0

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