2012A&A...542L..22R


Query : 2012A&A...542L..22R

2012A&A...542L..22R - Astronomy and Astrophysics, volume 542, L22-22 (2012/6-1)

[CII] gas in IC 342.

ROELLIG M., SIMON R., GUESTEN R., STUTZKI J., HUEBERS H.-W., HARTOGH P., JACOBS K., GUAN X. and ISRAEL F.

Abstract (from CDS):

We used the dual-band receiver GREAT on board the SOFIA airborne telescope to perform observations of the [CII] 158µm fine-structure line at the postitions of two giant molecular clouds (GMC) in the center of IC 342 (GMCs C and E) and compared the spectra with corresponding ground-based data for low- and mid-J CO and [CI]. We performed model calculations assuming a clumpy photo-dissociation region (PDR) environment using the KOSMA-τ PDR model code to derive physical parameters of the local medium. The [CII] 158µm emission resembles the spectral signature of ground-based atomic and molecular lines, which indicates a common origin. The emission from GMC E can be decomposed into a cool, molecular component with weak far-ultraviolet (FUV) fields and low, mean densities of 103cm–3 and a strongly excited starburst/PDR region with higher densities of 104cm–3 and FUV intensities of 250-300 Draine fields. The emission from GMC C is consistent with gas densities of 5000cm–3, FUV intensities of a few Draine fields and total gas masses of 20x106M. The high spectral resolution of the GREAT receiver allowed us to decompose the [CII] emission of the GMC E into a strongly excited gas component resembling a PDR/starburst environment and a quieter, less excited gas component and to analyze the different components within a single beam individually.

Abstract Copyright:

Journal keyword(s): galaxies: ISM - galaxies: individual: IC 342 - radio lines: galaxies - radio lines: ISM - ISM: atoms

Simbad objects: 4

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Number of rows : 4
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 [DRG92] E Cld 03 46 47.53 +68 05 43.5           ~ 10 0
2 [DRG92] B Cld 03 46 47.85 +68 05 46.5           ~ 13 0
3 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1428 1
4 [DRG92] C Cld 03 46 49.16 +68 05 50.8           ~ 11 0

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2021.10.17-00:29:50

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