2014A&A...561A..83P

Query : 2014A&A...561A..83P

2014A&A...561A..83P - Astronomy and Astrophysics, volume 561A, 83-83 (2014/1-1)

SDC13 infrared dark clouds: longitudinally collapsing filaments?

PERETTO N., FULLER G.A., ANDRE Ph., ARZOUMANIAN D., RIVILLA V.M., BARDEAU S., DUARTE PUERTAS S., GUZMAN FERNANDEZ J.P., LENFESTEY C., LI G.-X., OLGUIN F.A., ROECK B.R., DE VILLIERS H. and WILLIAMS J.

Abstract (from CDS):

Formation of stars is now believed to be tightly linked to the dynamical evolution of interstellar filaments in which they form. In this paper we analyze the density structure and kinematics of a small network of infrared dark filaments, SDC13, observed in both dust continuum and molecular line emission with the IRAM 30m telescope. These observations reveal the presence of 18 compact sources amongst which the two most massive, MM1 and MM2, are located at the intersection point of the parsec-long filaments. The dense gas velocity and velocity dispersion observed along these filaments show smooth, strongly correlated, gradients. We discuss the origin of the SDC13 velocity field in the context of filament longitudinal collapse. We show that the collapse timescale of the SDC13 filaments (from 1 Myr to 4 Myr depending on the model parameters) is consistent with the presence of Class I sources in them, and argue that, on top of bringing more material to the centre of the system, collapse could generate additional kinematic support against local fragmentation, helping the formation of starless super-Jeans cores.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - ISM: clouds - ISM: kinematics and dynamics - ISM: structure

VizieR on-line data: <Available at CDS (J/A+A/561/A83): table5.dat sd13n2hp.fit>

Nomenclature: [PFA2014] SDC13 N=1. Fig. 1, Table 2: [PFA2014] MMN (Nos MM1-MM18).

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1364 0
2 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3630 1
3 SDC G335.579-0.292 DNe 16 30 58.00 -48 44 16.3           ~ 33 0
4 NGC 6334 HII 17 20 53 -36 07.9           ~ 682 0
5 [PFA2014] MM16 mm 18 14 24.56 -17 31 42.4           ~ 2 0
6 [PFA2014] MM17 mm 18 14 24.79 -17 31 56.4           ~ 2 0
7 [PFA2014] MM13 mm 18 14 25.72 -17 32 07.0           ~ 2 0
8 [PFA2014] MM15 mm 18 14 26.67 -17 32 27.9           ~ 2 0
9 [PFA2014] MM11 mm 18 14 27.37 -17 32 42.0           ~ 2 0
10 SDC G13.158-0.073 DNe 18 14 28.29 -17 33 27.7           ~ 7 0
11 [PFA2014] MM2 mm 18 14 28.53 -17 33 30.9           ~ 4 0
12 [PFA2014] MM18 mm 18 14 29.46 -17 33 13.4           ~ 2 0
13 SDC G13.174-0.070 DNe 18 14 29.55 -17 32 32.1           ~ 6 0
14 [PFA2014] SDC13 DNe 18 14 29.7 -17 32 35           ~ 18 0
15 [PFA2014] MM8 mm 18 14 29.93 -17 33 48.4           ~ 1 0
16 [PFA2014] MM4 mm 18 14 30.63 -17 33 59.0           ~ 2 0
17 [PFA2014] MM1 mm 18 14 30.86 -17 33 20.4           ~ 4 0
18 [PFA2014] MM10 mm 18 14 32.26 -17 32 24.5           ~ 2 0
19 SDC G13.194-0.073 DNe 18 14 32.57 -17 31 33.6           ~ 6 0
20 [PFA2014] MM9 mm 18 14 32.73 -17 31 39.0           ~ 2 0
21 [PFA2014] MM7 mm 18 14 32.96 -17 34 19.9           ~ 2 0
22 [PFA2014] MM5 mm 18 14 33.89 -17 31 14.4           ~ 2 0
23 [PFA2014] MM12 mm 18 14 34.59 -17 30 21.9           ~ 1 0
24 [PFA2014] MM14 mm 18 14 34.83 -17 34 41.0           ~ 1 0
25 [PFA2014] MM6 mm 18 14 35.30 -17 30 36.0           ~ 1 0
26 [PFA2014] MM3 mm 18 14 35.53 -17 30 53.4           ~ 2 0
27 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1100 2
28 NAME Serpens South Cluster Cl* 18 30 03.00 -02 01 58.2           ~ 132 0

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