GBT Multiwavelength Survey of the Galactic Center Region

Abstract

We describe the results of a radio continuum survey of the central 4x1deg with the 100 m Green Bank Telescope (GBT) at wavelengths of 3.5, 6, 20, and 90 cm. The 3.5 and 6 cm surveys are the most sensitive and highest resolution single dish surveys made of the central degrees of our Galaxy. We present catalogs of compact and extended sources in the central four degrees of our Galaxy, including detailed spectral index studies of all sources. The analysis covers star-forming regions such as Sgr B and Sgr C where we find evidence of a mixture of thermal and nonthermal emission. The analysis quantifies the relative contribution of thermal and nonthermal processes to the radio continuum flux density toward the GC region. In the central 4x1deg of the GC, the thermal and nonthermal flux fractions for all compact and diffuse sources are 28%/72% at 3.5 cm and 19%/81% at 6 cm. The total flux densities from these sources are 783+-52 Jy and 1063+-93 Jy at 3.5 and 6 cm, respectively, excluding the contribution of Galactic synchrotron emission.

Accepted to ApJS. 40 pages, 46 figures, 8 tables (emulate apj style)

References in corpus (5)

• Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
• The Origin of Diffuse X-ray and $\gamma$-ray Emission from the Galactic Center Region: Cosmic Ray Particles
• Cosmic-Ray Heating of Molecular Gas in the Nuclear Disk: Low Star Formation Efficiency
• Spitzer IRS Observations of the Galactic Center: Shocked Gas in the Radio Arc Bubble
• Non-Thermal Continuum toward SGRB2(N-LMH)

Cited by in corpus (25)

• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• Star Formation in the Central 400 pc of the Milky Way: Evidence for a Population of Massive YSOs
• Wild at Heart:-The Particle Astrophysics of the Galactic Centre
• A Wide-area VLA Continuum Survey near the Galactic Center at 6 and 20 cm Wavelengths
• The Breakthrough Listen Search For Intelligent Life Near the Galactic Center I
• Extraterrestrial Axion Search with the Breakthrough Listen Galactic Center Survey
• Candidate radio supernova remnants observed by the GLEAM survey over $345^{\circ }<l<60^{\circ }$ and $180^{\circ }<l<240^{\circ }$
• The Atacama Cosmology Telescope: Microwave Intensity and Polarization Maps of the Galactic Center
• The Cosmic Ray Population of the Galactic Central Molecular Zone
• Fourier Plane Image Combination by Feathering
• Prospects of 3D mapping of the Galactic Centre clouds with X-ray polarimetry
• The physical and chemical structure of Sagittarius B2 -- VI. UCHII regions in Sgr B2
• X-ray Observation of a Magnetized Hot Gas Outflow in the Galactic Center Region
• Cosmic-Ray Models of the Ridge-Like Excess of Gamma Rays in the Galactic Center
• A 6.7 GHz methanol maser survey of the central molecular zone
• Multi-epoch searches for relativistic binary pulsars and fast transients in the Galactic Centre
• Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre
• Australia Telescope Compact Array Radio Continuum 1384 and 2368 Mhz Observations of Sagittarius B
• The Galactic Center Lobe Filled with Thermal Plasma
• Cosmic rays cannot explain the high ionisation rates in the Galactic centre
• SOFIA-upGREAT imaging spectroscopy of the [C II] 158um fine structure line of the Sgr B region in the Galactic center
• A Galactic Dust Devil: far-infrared observations of the Tornado Supernova Remnant candidate
• Electroweak Dark Matter
• 4-8 GHz Fourier-domain Searches for Galactic Center Pulsars
• A survey for radio pulsars and transients in the 10 pc region around Sgr A*