Dusty Sources at the Galactic Center: The N- and Q-band view with VISIR

Abstract

We present mid-infrared N- and Q-band photometry of the Galactic Center from images obtained with the mid-infrared camera VISIR at the ESO VLT in May 2004. The high resolution and sensitivity possible with VISIR enables us to investigate a total of over 60 point-like sources, an unprecedented number for the Galactic Center at these wavelengths. Combining these data with previous results at shorter wavelengths (Viehmann et al. 2005) enables us to construct SEDs covering the H- to Q-band regions of the spectrum, i.e. 1.6 to 19.5 $\mu$m. We find that the SEDs of certain types of Galactic Center sources show characteristic features. We can clearly distinguish between luminous Northern Arm bow-shock sources, lower luminosity bow-shock sources, hot stars, and cool stars. This characterization may help clarify the status of presently unclassified sources.

arXiv comment18 pages, 4 figures, 1 table, accepted for publication in the Astrophysical Journal

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• The mean infrared emission of SagittariusA*
• Radio Continuum Observations of the Galactic Center: Photoevaporative Proplyd-like Objects near Sgr A*
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• Approaching hell's kitchen: Molecular daredevil clouds in the vicinity of Sgr A*
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• Compact mid-IR sources east of galactic center source IRS5
• Properties of bow-shock sources at the Galactic center
• Flares and variability from Sagittarius A*: five nights of simultaneous multi-wavelength observations
• The Magnetic Field in the central parsec of the Galaxy
• Signatures of Young Star Formation Activity Within Two Parsecs of Sgr A*
• Absorption at 11 microns in the interstellar medium and embedded sources: evidence for crystalline silicates
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• X3: a high-mass Young Stellar Object close to the supermassive black hole Sgr~A*
• Mid-Infrared studies of dusty sources in the Galactic Center
• Intrinsically Polarized Stars and Implication for Star Formation in the Central Parsec of Our Galaxy
• Candidate Young Stellar Objects in the S-cluster: The Kinematic Analysis of a Sub-population of the Low-mass G-objects close to Sgr A*
• Ices in the Galactic Centre : solid ice and gaseous CO in the central parsec
• Observations of the 86 GHz SiO maser sources in the Central Parsec of the Galactic Centre
• Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*