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

Abstract

The Central Molecular Zone (CMZ), covering the inner ~1${}^{\circ }$ of the Galactic plane has been mapped at 2 mm using the GISMO bolometric camera on the 30 m IRAM telescope. The $21^{\prime \prime }$ 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 $\mu$m emission for most lines of sight, if the long-wavelength dust emissivity scales as ${\lambda }^{-\beta }$ with $\beta \approx 2.25$. 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.

arXiv comment18 pages, 15 figures. Accepted for publication in the ApJ

References in corpus (30)

• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• Planck 2013 results. XI. All-sky model of thermal dust emission
• A geometric distance measurement to the Galactic Center black hole with 0.3% uncertainty
• The Stellar Cusp Around the Supermassive Black Hole in the Galactic Center
• IRIS: A new generation of IRAS maps
• Common-Resolution Convolution Kernels for Space- and Ground-Based Telescopes
• A 100-parsec elliptical and twisted ring of cold and dense molecular clouds revealed by Herschel around the Galactic Center
• Massive Stars in the Quintuplet Cluster
• Massive Stars in the Arches Cluster
• Hi-GAL, the Herschel infrared Galactic Plane Survey: photometric maps and compact source catalogues. First data release for Inner Milky Way: +68°> l > -70°
• Star Formation in the Central 400 pc of the Milky Way: Evidence for a Population of Massive YSOs
• A deep submillimetre survey of the Galactic Centre
• The Bolocam Galactic Plane Survey IX: Data Release 2 and Outer Galaxy Extension
• The Bolocam Galactic Plane Survey IV: 1.1 and 0.35 mm Dust Continuum Emission in the Galactic Center Region
• Variations of the spectral index of dust emissivity from Hi-GAL observations of the Galactic plane
• The Interplay between Star Formation and the Nuclear Environment of our Galaxy: Deep X-ray Observations of the Galactic Center Arches and Quintuplet Clusters
• The degeneracy between dust colour temperature and spectral index. Comparison of methods for estimating the beta(T) relation
• Spitzer IRS Observations of the Galactic Center: Shocked Gas in the Radio Arc Bubble
• The degeneracy between the dust colour temperature and the spectral index. The problem of multiple chi^2 minima
• Scanning strategies for imaging arrays
• X-ray Thread G0.13-0.11: A Pulsar Wind Nebula?
• Compact Radio Sources within 30" of Sgr A*: Proper Motions, Stellar Winds and the Accretion Rate onto Sgr A*
• ISO observations of the Galactic center Interstellar Medium: ionized gas
• Spitzer Infrared Spectrograph Observations of the Galactic Center: Quantifying the Extreme Ultraviolet/so ft X-ray fluxes
• The CARMA 3mm Survey of the Inner $0.7^{\circ }\times 0.4^{\circ }$ of the Central Molecular Zone
• SOFIA FIFI-LS Observations of Sgr B1: Ionization Structure and Sources of Excitation
• The QUaD Galactic Plane Survey 1: Maps And Analysis of Diffuse Emission
• 2 mm GISMO Observations of the Galactic Center. II. A Nonthermal Filament in the Radio Arc and Compact Sources
• Properties of dust in the Galactic center region probed by AKARI far-infrared spectral mapping - detection of a dust feature

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• Populations of Magnetized Filaments in the Intracluster Medium and the Galactic Center
• Statistical Properties of the Population of the Galactic Center Filaments II: The Spacing Between Filaments
• Sagittarius B1 -- A Patchwork of H II Regions and PhotoDissociation Regions
• 2 mm GISMO Observations of the Galactic Center. II. A Nonthermal Filament in the Radio Arc and Compact Sources
• SOFIA/HAWC+ Far-Infrared Polarimetric Large Area CMZ Exploration Survey. V. The Magnetic Field Strength and Morphology in the Sagittarius C Complex