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J/A+A/591/A33 [CII]158um and [NII]205um IC 342 spectra (Roellig+, 2016)
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[CII] 158mum and [NII] 205mum emission in IC 342.
Disentangling the emission from ionized and photo-dissociated regions.
Roellig M., Simon R., Gusten R., Stutzki J., Israel F., Jacobs K.
<Astron. Astrophys. 591, A33 (2016)>
=2016A&A...591A..33R (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, nearby ; Spectroscopy
Keywords: galactic: ISM - galactic: individual: IC 342 -
radio lines: galaxies - radio lines: ISM - galaxies: starburst
Abstract:
Atomic fine-structure line emission is a major cooling process in the
interstellar medium (ISM). In particular the [CII] 158um line is
one of the dominant cooling lines in photon-dominated regions (PDRs).
However, it is not confined to PDRs but can also originate from the
ionized gas closely surrounding young massive stars. The proportion of
the [CII] emission from HII regions relative to that from PDRs can
vary significantly.
We investigate the question of how much of the [CII] emission in the
nucleus of the nearby spiral galaxy IC 342 is contributed by PDRs and
by the ionized gas. We examine the spatial variations of starburst/PDR
activity and study the correlation of the [CII] line with the [NII]
205um emission line coming exclusively from the HII regions.
We present small maps of [CII] 158um and [NII] 205um lines
recently observed with the GREAT receiver on board SOFIA. We present
different methods to utilize the superior spatial and spectral
resolution of our new data to infer information on how the gas
kinematics in the nuclear region influence the observed line profiles.
In particular we present a super-resolution method to derive how
unresolved, kinematically correlated structures in the beam contribute
to the observed line shapes.
Description:
[CII] 158um and [NII] 205um SOFIA/GREAT data of the nucleus of IC342.
Objects:
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RA (2000) DE Designation(s)
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03 46 48.51 +68 05 46.0 IC 342 = UGC 2847
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