2 mm GISMO Observations of the Galactic Center. I. Dust Emission
Morris, Mark R.; Staguhn, Johannes; Gonzalez-Quiles, Junellie; Arendt, Richard G.; Dwek, Eli; Kovács, Attila; Benford, Dominic J.; Yusef-Zadeh, Farhad
United States
Abstract
The central molecular zone, covering the inner ∼1° of the Galactic plane has been mapped at 2 mm using the Goddard-IRAM Superconducting 2-Millimeter Observer (GISMO) bolometric camera on the 30 m IRAM telescope. The 21″ resolution maps show abundant emission from cold molecular clouds, from star-forming regions, and from one of the Galactic center nonthermal filaments. In this work we use the Herschel Hi-GAL data to model the dust emission across the Galactic center. We find that a single-temperature fit can describe the 160-500 μm emission for most lines of sight, if the long-wavelength dust emissivity scales as λ -β with β ≈ 2.25. This dust model is extrapolated to predict the 2 mm dust emission. Subtraction of the model from the GISMO data provides a clearer look at the 2 mm emission of star-forming regions and the brightest nonthermal filament.
Based on observations carried out with the IRAM 30 m Telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).