Dust Emission from a Large Scale Shock Near the Galactic Center

Details Dust Emission from a Large Scale Shock Near the Galactic Center Dust Emission from a Large Scale Shock Near the Galactic Center

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381...84s&link_type=abstract

The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,

Astronomy and Astrophysics

Astronomy

Scientific paper

AFGL5376 is a prominent 25 μm source near the Galactic Center produced by a large scale (˜100 pc) shock that extends well above the Galactic plane. This shock region coincides with the edge of a vertical radio continuum feature, which appears to be at the surface of a 150-pc lobe that encompasses the Galactic center. There is no evidence for nearby star formation. The unusually warm (T˜100 K) dust emission peak, traced by the 25 μm emission, is clearly surrounded by high velocity ^{12}CO(2-1) emission. We are currently conducting a comprehensive observing study of the region including Spitzer IRS and MIPS observations. Our continuum observations are aimed at allowing the derivation of mass and temperature distribution at sub-parsec resolution. Here we present MIPS 24 μm observations in combination with MAMBO observations at 1.2 mm wavelength. The latter reveal the presence of strong millimeter continuum emission in the vicinity of AFGL5376. We present a first estimate of the masses of the cold molecular clouds that are associated with this region. Our complete set of continuum Spitzer and (sub-)millimeter emission measurements together with our IRS spectroscopy will be used later to constrain magnetohydrodynamic models for the production of this highly energetic feature.

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