2011A&A...528A..50D


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST08:04:26

2011A&A...528A..50D - Astronomy and Astrophysics, volume 528A, 50-50 (2011/4-1)

Was a cloud-cloud collision the trigger of the recent star formation in Serpens?

DUARTE-CABRAL A., DOBBS C.L., PERETTO N. and FULLER G.A.

Abstract (from CDS):

The complexity of the interstellar medium (ISM) is such that it is unlikely that star formation is initiated in the same way in all molecular clouds. While some clouds seem to collapse on their own, others may be triggered by an external event such as a cloud/flow collision forming a gravitationally unstable enhanced density layer. This work tests cloud-cloud collisions as the triggering mechanism for star formation in the Serpens Main Cluster as has been suggested by previous work. A set of smoothed particle hydrodynamics (SPH) simulations of the collision between two cylindrical clouds are performed and compared to (sub)millimetre observations of the Serpens Main Cluster. A configuration was found that reproduces many of the observed characteristics of Serpens, including some of the main features of the peculiar velocity field. The evolution of the velocity with position throughout the model is similar to the observed one and the column density and masses within the modelled cloud agree with those measured for the SE sub-cluster. Furthermore, our results also show that an asymmetric collision provides the ingredients to reproduce lower density filaments perpendicular to the main structure, similar to those observed. In this scenario, the formation of the NW sub-cluster of Serpens can be reproduced only if there is a pre-existing marginally gravitationally unstable region at the time the collision occurs. This work supports the interpretation that a collision between two clouds may have been the trigger of the most recent burst of star formation in Serpens. It not only explains the complicated velocity structure seen in the region, but also the temperature differences between the north (in ``isolated'' collapse) and the south (resulting from the shock between the clouds). In addition it provides an explanation for the sources in the south having a larger spread in age than those in the north.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: individual: Serpens - ISM: clouds - ISM: kinematics and dynamics - methods: numerical

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 - 2021
#notes
1 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1251 0
2 NAME Mon OB1 C PoC 06 41 11 +09 29.1           ~ 50 1
3 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 351 1
4 HD 168797 Be* 18 21 28.4010410086 +05 26 08.558219035 5.47 6.09 6.13     B2Vne 118 0
5 SH 2-68 N Y*O 18 29 48.09 +01 16 45.0           ~ 112 1
6 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 967 2
7 NAME SH 2-68 FIR 1 cor 18 29 49.63 +01 15 21.9           ~ 241 2
8 V* V371 Ser Or* 18 29 51.21240 +01 16 39.4860           ~ 96 1
9 NAME Serpens SMM 10 IR Y*O 18 29 52.20 +01 15 47.6           ~ 43 1
10 NAME Serpens Cluster Cl* 18 29 57 +01 14.4           ~ 59 0
11 NAME Serpens SMM 4 cor 18 29 57.1 +01 13 15           ~ 126 0
12 NAME SERPENS SMM 3 smm 18 29 59.7 +01 14 00           ~ 86 1
13 NAME Serpens SMM 11 smm 18 30 00.3 +01 11 42           ~ 23 0
14 JCMTSE J183000.2+011251 Y*O 18 30 00.4 +01 12 50           ~ 51 0
15 [CED93] 8 smm 18 30 01.8 +01 15 07           ~ 17 0

    Equat.    Gal    SGal    Ecl

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2021.04.15-08:04:26

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