C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:18:36

2017A&A...606A.133S - Astronomy and Astrophysics, volume 606A, 133-133 (2017/10-1)

Temperature structure and kinematics of the IRDC G035.39-00.33.


Abstract (from CDS):

Aims. Infrared dark clouds represent the earliest stages of high-mass star formation. Detailed observations of their physical conditions on all physical scales are required to improve our understanding of their role in fueling star formation.
Methods. We investigate the large-scale structure of the IRDC G035.39-00.33, probing the dense gas with the classical ammonia thermometer. This allows us to put reliable constraints on the temperature of the extended, pc-scale dense gas reservoir and to probe the magnitude of its non-thermal motions. Available far-infrared observations can be used in tandem with the observed ammonia emission to estimate the total gas mass contained in G035.39-00.33.
Results. We identify a main velocity component as a prominent filament, manifested as an ammonia emission intensity ridge spanning more than 6pc, consistent with the previous studies on the Northern part of the cloud. A number of additional line-of-sight components are found, and a large-scale linear velocity gradient of ∼0.2km/s/pc is found along the ridge of the IRDC. In contrast to the dust temperature map, an ammonia-derived kinetic temperature map, presented for the entirety of the cloud, reveals local temperature enhancements towards the massive protostellar cores. We show that without properly accounting for the line of sight contamination, the dust temperature is 2-3K larger than the gas temperature measured with NH3.
Conclusions. While both the large-scale kinematics and temperature structure are consistent with that of starless dark filaments, the kinetic gas temperature profile on smaller scales is suggestive of tracing the heating mechanism coincident with the locations of massive protostellar cores.

Abstract Copyright: © ESO, 2017

Journal keyword(s): ISM: kinematics and dynamics - ISM: clouds - stars: formation - ISM: individual objects: G035.39-00.33 - ISM: individual objects: G035.39-00.33

VizieR on-line data: <Available at CDS (J/A+A/606/A133): list.dat fits/*>

CDS comments: Beams B3 and B4 not in SIMBAD

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2495 2
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3478 0
3 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 333 1
4 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 912 2
5 MSXDC G035.39-0.33 MoC 18 57 09.0 +02 07 46           ~ 82 0
6 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 144 0

    Equat.    Gal    SGal    Ecl

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