2001A&A...378..608O


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.22CET21:34:57

2001A&A...378..608O - Astronomy and Astrophysics, volume 378, 608-626 (2001/11-1)

Massive core parameters from spatially unresolved multi-line observations.

OSSENKOPF V., TROJAN C. and STUTZKI J.

Abstract (from CDS):

We present observations of 15 massive cores in three different CS transitions from the FCRAO 14 m and the KOSMA 3 m telescope. We derive physical parameters of these cores using different approaches to the line radiative transfer problem. The local radiative transfer approximations fail to provide reliable values except for the column densities. A self-consistent explanation of the observed line profiles is only possible when taking density gradients and an internal turbulent structure of the cores into account. The observational data can be fitted by a spherically symmetric radiative transfer model including such gradients and a turbulent clumping. We find that the observed massive cores are approximately virialised with a clumpy density profile that decays with a radial exponent of about -1.6 down to a relatively sharp outer boundary. We show that a careful analysis of spatially unresolved multi-line observations using a physical radiative transfer model can provide values for physical parameters that could be obtained otherwise only by direct observations with much higher spatial resolution. This applies to all quantities directly affecting the line excitation, like the mass and size of dense cores. Information on the exact location or number of clumps, of course, always has to rely on high-resolution observations e.g. from interferometers.

Abstract Copyright:

Journal keyword(s): line: profiles - radiative transfer - ISM: clouds - ISM: structure - radio lines: ISM

Simbad objects: 16

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Number of rows : 16

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 W 3 OH HII 02 27 04.1 +61 52 22           ~ 948 2
2 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 969 3
3 OMC 2 MoC 05 35 27 -05 10.1           ~ 398 1
4 SH 2-235 B HII 05 40 52.366 +35 41 29.43   17       ~ 173 1
5 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1081 1
6 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 661 2
7 NAME SH 2-255 IRS 1 Y*O 06 12 54.0060 +17 59 22.958           ~ 324 0
8 IC 2162 HII 06 13 04.1 +17 58 44           ~ 339 2
9 NGC 2264 OpC 06 40 58 +09 53.7           ~ 1611 0
10 * rho Oph A * 16 25 35.1182364594 -23 26 49.827436721 4.3 5.22 5.05     B2/3V 397 0
11 SNR G012.8-00.2 SFR 18 14 14.0 -17 55 50           ~ 221 0
12 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 944 2
13 W 49a SFR 19 10 15.7 +09 06 05           ~ 264 2
14 [OMN2000] Region 3 PoC 19 23 29.3 +14 31 38           ~ 153 0
15 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 413 2
16 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 954 0

    Equat.    Gal    SGal    Ecl

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2021.01.22-21:34:57

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