2014MNRAS.439.1996J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST06:37:48

2014MNRAS.439.1996J - Mon. Not. R. Astron. Soc., 439, 1996-2013 (2014/April-1)

Gas kinematics and excitation in the filamentary IRDC G035.39-00.33.

JIMENEZ-SERRA I., CASELLI P., FONTANI F., TAN J.C., HENSHAW J.D., KAINULAINEN J. and HERNANDEZ A.K.

Abstract (from CDS):

Some theories of dense molecular cloud formation involve dynamical environments driven by converging atomic flows or collisions between preexisting molecular clouds. The determination of the dynamics and physical conditions of the gas in clouds at the early stages of their evolution is essential to establish the dynamical imprints of such collisions, and to infer the processes involved in their formation. We present multitransition 13CO and C18O maps towards the IRDC G035.39-00.33, believed to be at the earliest stages of evolution. The 13CO and C18O gas is distributed in three filaments (Filaments 1, 2 and 3), where the most massive cores are preferentially found at the intersecting regions between them. The filaments have a similar kinematic structure with smooth velocity gradients of ∼ 0.4-0.8 km/s/pc. Several scenarios are proposed to explain these gradients, including cloud rotation, gas accretion along the filaments, global gravitational collapse and unresolved sub-filament structures. These results are complemented by HCO+, HNC, H13CO+ and HN13C single-pointing data to search for gas infall signatures. The 13CO and C18O gas motions are supersonic across G035.39-00.33, with the emission showing broader linewidths towards the edges of the infrared dark cloud (IRDC). This could be due to energy dissipation at the densest regions in the cloud. The average H2 densities are ∼ 5000-7000cm-3, with Filaments 2 and 3 being denser and more massive than Filament 1. The C18O data unveil three regions with high CO depletion factors (fD ∼ 5-12), similar to those found in massive starless cores.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): stars: formation - ISM: individual objects: G035.39-00.33 - ISM: molecules

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME [BM89] B5 DNe 03 47 38.3 +32 52 43           ~ 220 0
2 LDN 1495 DNe 04 18.1 +27 37           ~ 289 1
3 Barnard 213 DNe 04 20 51 +27 16.3           ~ 153 0
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3478 0
5 LDN 1517 DNe 04 55 45 +30 33.0           ~ 97 0
6 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 848 1
7 SDC G335.579-0.292 DNe 16 30 58.00 -48 44 16.3           ~ 22 0
8 OH 20.1 -0.1 SFR 18 28 10.3918 -11 28 44.164           ~ 107 0
9 RAFGL 5491 mul 18 28 10.7 -11 29 01           ~ 45 0
10 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 912 2
11 NAME Serpens South Cluster Cl* 18 30 03.00 -02 01 58.2           ~ 88 0
12 [ZYL2017] G35-8 MoC 18 57 06.88 +02 08 44.8           ~ 13 0
13 [ZYL2017] G35-4 MoC 18 57 06.92 +02 08 20.9           ~ 14 0
14 [ZYL2017] G35-7 MoC 18 57 08.17 +02 10 51.8           ~ 20 0
15 [ZYL2017] G35-6 MoC 18 57 08.27 +02 08 57.7           ~ 14 0
16 [ZYL2017] G35-5 MoC 18 57 08.83 +02 08 24.3           ~ 14 0
17 MSXDC G035.39-0.33 MoC 18 57 09.0 +02 07 46           ~ 82 0
18 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 944 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-06:37:48

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