2008A&A...489..207S


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.04CEST09:23:28

2008A&A...489..207S - Astronomy and Astrophysics, volume 489, 207-216 (2008/10-1)

The photon dominated region in the IC348 molecular cloud.

SUN K., OSSENKOPF V., KRAMER C., MOOKERJEA B., ROELLIG M., CUBICK M. and STUTZKI J.

Abstract (from CDS):

In this paper we discuss the physical conditions of clumpy nature in the IC348 molecular cloud. We show that the millimeter and sub-millimeter line emission from the IC348 molecular cloud can be modelled as originating from a photon dominated region (PDR). We combine new observations of fully sampled maps in [CI] at 492GHz and 12CO 4-3, taken with the KOSMA 3m telescope at about 1' resolution, with FCRAO data of 12CO 1-0, 13CO 1-0 and far-infrared continuum data observed by HIRES/IRAS. To derive the physical parameters of the region we analyze the line ratios of [CI] 3P1-3P0/12CO 4-3, [CI]3P1-3P0/13CO 1-0, and 12CO 4-3/12CO 1-0. A first rough estimate of abundance is obtained from an LTE analysis. To understand the [CI] and CO emission from the PDRs in IC348, we use a clumpy PDR model. With an ensemble of identical clumps, we constrain the total mass from the observed absolute intensities. Then we apply a more realistic clump distribution model with a power law index of 1.8 for clump-mass spectrum and a power law index of 2.3 for mass-size relation. We provide detailed fits to observations at seven representative positions in the cloud, revealing clump densities between 4x104cm–3 and 4x105cm–3 and C/CO column density ratios between 0.02 and 0.26. The derived FUV flux from the model fit is consistent with the field calculated from FIR continuum data, varying between 2 and 100 Draine units across the cloud. We find that both an ensemble of identical clumps and an ensemble with a power law clump mass distribution produce line intensities which are in good agreement (within a factor ∼2) with the observed intensities. The models confirm the anti-correlation between the C/CO abundance ratio and the hydrogen column density found in many regions.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: dust, extinction - ISM: structure - ISM: individual objects: IC348

Status at CDS:  

Simbad objects: 11

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Number of rows : 11

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 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 955 3
2 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1033 0
3 IC 348 OpC 03 44 34 +32 09.8           ~ 1216 1
4 HD 281159 Y*? 03 44 34.197 +32 09 46.27 9.19 9.21 8.53   7.850 B5V 201 2
5 NAME Ori A MoC 05 38 -07.1           ~ 2646 0
6 NAME Polaris Flare MoC 11 00 14.8 +86 10 52           ~ 162 1
7 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 802 2
8 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3737 4
9 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 456 0
10 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 408 2
11 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 937 0

    Equat.    Gal    SGal    Ecl

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2020.04.04-09:23:28

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