2 mm GISMO Observations of the Galactic Center. I. Dust Emission

Date

2019-11-01

Department

Program

Citation of Original Publication

Richard G. Arendt and Johannes Staguhn and Eli Dwek and Mark R. Morris and Farhad Yusef-Zadeh and Dominic J. Benford and Attila Kovács and Junellie Gonzalez-Quiles, 2 mm GISMO Observations of the Galactic Center. I. Dust Emission, 2019; The Astrophysical Journal 885,1 (2019 November 1); https://iopscience.iop.org/article/10.3847/1538-4357/ab451c

Rights

This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication

Abstract

The Central Molecular Zone (CMZ), covering the inner ∼ 1 ◦ of the Galactic plane has been mapped at 2 mm using the GISMO bolometric camera on the 30 m IRAM telescope. The 2100 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.