Multicolour 8-MICRON to 13-MICRON Maps of the Central Parsec of the Galaxy

Details Multicolour 8-MICRON to 13-MICRON Maps of the Central Parsec of the Galaxy Multicolour 8-MICRON to 13-MICRON Maps of the Central Parsec of the Galaxy

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246....1s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 246, NO. 1/SEP1, P. 1, 1990

Astronomy and Astrophysics

Astronomy

20

Scientific paper

We present 8-13 μm multi-colour maps of the central 25" x 25" of the Galaxy, obtained with beam diameter ≥2" and spectral resolution of λ/Δλ≥40. Also presented are pointed spectra with high signal-to-noise (> 100) obtained using 2" beams in the region of the east-west bar between IRS 1 and IRS 2. Model fits to the spectra, from both pointed observations and the map, yield information on the temperature and opacity structure of the region and indicate that the compact 10 μm sources display enhancements in the dust temperature, in some cases slightly displaced from the intensity peaks, and that the temperature decreases towards the lateral edges of the northern arm and east-west bar. The northern arm, and particularly the region around IRS 1, are regions where emission from silicate dust is significantly enhanced. We find no evidence for temperature gradients or rim heating centred on the region of IRS 16/SgrA*.
Comparison with radio continuum studies of the region leads to the conclusion that nebular heating supplies only a small fraction of the infrared luminosity of the ionized filaments. IRS 1 and 10 must therefore contain internal heating sources, and in the absence of an externally centred temperature gradient, a substantial part of the infrared luminosity of the filaments must also come from internal heating.

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