ISOCAM-CVF imaging of M16

Urquhart, J.S. and White, G.J. and Pilbratt, G.L. and Fridlund, C.V.M. (2003) ISOCAM-CVF imaging of M16. Astronomy & Astrophysics, 409 (1). pp. 193-203. ISSN 0004-6361. (The full text of this publication is not available from this repository)

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Abstract

We present ISOCAM observations (5 - 17 mum) of the HST M16 field, including the striking elephant trunk structures. The spectroscopic data have been obtained using the ISOCAM-CVF low-resolution mode, having a spectral resolution of similar to 40 (lambda/Deltalambda) and a pixel size of 6". The spectra show a combination of Unidentified Infrared Band (UIB) emission centred at 6.2, 7.7, 8.6, 11.3 and 16.4 mum, and atomic fine-structure lines of [ArII] 7.0 mum, [ArIII] 9.0 mum, [SIV] 10.5 mum, [NeII] 12.8 mum and [NeIII] 15.6 mum. The spectra were decomposed by fitting a combination of Lorentzian line profiles and a blackbody curve to the data to produce maps of the spatial distribution of the fine-structure and UIB emission features. These maps have been compared with VLA radio, 450 mum SCUBA maps, (CO)-C-12 (J = 1-0) maps, and broadband filters ISOCAM LW2 (5 - 8.5 mum) and LW3 (12 - 18 mum) observations. Decomposed spectral features have shown that the LW2 filter is dominated by UIB emission and the emission observed in the LW3 filter is a combination of Neon fine-structure lines and a steep continuum, with the continuum dominating. Using the photoionisation code CLOUDY we have produced theoretical values for the fine-structure ratio of [NeIII] 15.6 mum /[NeII] 12.8 mum, from which we have calculated the effective ionising flux impinging onto the tips of the pillars to be similar to 1-3 x 10(10) photons cm(-2) s(-1), consistent with estimates made from VLA observations.

Item Type: Article
Additional information: 41 E D P SCIENCES 721LQ
Uncontrolled keywords: ISM : HII regions; ISM : lines and bands; infrared : ISM; ISM : individual object : Eagle Nebula POLYCYCLIC AROMATIC-HYDROCARBONS; INFRARED-EMISSION BANDS; YOUNG STELLAR OBJECTS; PHOTODISSOCIATION REGIONS; STAR-FORMATION; EAGLE-NEBULA; INTERSTELLAR DUST; PHOTOEVAPORATION; EVOLUTION; GALAXIES
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Maggie Francis
Date Deposited: 12 Sep 2008 12:47
Last Modified: 14 Jan 2010 14:42
Resource URI: http://kar.kent.ac.uk/id/eprint/10925 (The current URI for this page, for reference purposes)
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