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.

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

References in corpus (22)

• Discovery of Very-High-Energy Gamma-Rays from the Galactic Centre Ridge
• A Robotic Wide-Angle H-Alpha Survey of the Southern Sky
• Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
• Hot and Diffuse Clouds near the Galactic Center Probed by Metastable H3+
• An Extended Star Formation History for the Galactic Center from Hubble Space Telescope/NICMOS Observations
• A $\lambda$20cm Survey of the Galactic Center Region I: Detection of Numerous Linear Filaments
• The Origin of Diffuse X-ray and $\gamma$-ray Emission from the Galactic Center Region: Cosmic Ray Particles
• Detection of X-ray Emission from the Arches Cluster Near the Galactic Center
• Radio Observations of the Hubble Deep Field South Region II: The 1.4 GHz Catalogue and Source Counts
• High-Resolution, Wide-Field Imaging of the Galactic Center Region at 330 MHz
• OH (1720 MHz) Masers and Mixed-Morphology Supernova Remnants
• 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
• Discoveries of Diffuse Iron Line Sources from the Sgr B Region
• Large scale ionization of the Radio Arc region by the Quintuplet and the Arches cluster
• Morphologies of Ultracompact HII Regions in W49A and Sgr B2: Prevalence of Shells and a Modified Classification Scheme
• The Molecular Counterpart of the Galactic Center Arched Filament HII Complex: OVRO Observations of the CS(2-1) Line
• Non-Thermal Continuum toward SGRB2(N-LMH)
• VLA Observations of the "Eye of the Tornado"- the High Velocity \HII Region G357.63-0.06
• The Cosmic Ray Distribution in Sagittarius B
• Galactic Center Shells and a Recurrent Starburst Model
• Untwisting the Tornado: X-ray Imaging and Spectroscopy of G357.7-0.1

Cited by in corpus (46)

• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• Astrophysical and Dark Matter Interpretations of Extended Gamma-Ray Emission from the Galactic Center
• Star Formation in the Central 400 pc of the Milky Way: Evidence for a Population of Massive YSOs
• Interacting Cosmic Rays with Molecular Clouds: A Bremsstrahlung Origin of Diffuse High Energy Emission from the Inner 2deg by 1deg of the Galactic Center
• Wild at Heart:-The Particle Astrophysics of the Galactic Centre
• Galactic center at very high-energies
• The Contribution of Cosmic Rays Interacting With Molecular Clouds to the Galactic Center Gamma-Ray Excess
• Multiwavelength Constraints on Pulsar Populations in the Galactic Center
• 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
• The Galactic centre pulsar population
• Detecting pulsars in the Galactic centre
• Dark Matter and Synchrotron Emission from Galactic Center Radio Filaments
• Pulse Morphology of the Galactic Center Magnetar PSR J1745-2900
• A Multiwavelength View of a Mass Outflow from the Galactic Center
• TeV Gamma-ray Observations of The Galactic Center Ridge By VERITAS
• Candidate radio supernova remnants observed by the GLEAM survey over $345^{\circ }<l<60^{\circ }$ and $180^{\circ }<l<240^{\circ }$
• Radio Recombination Lines toward the Galactic Center Lobe
• 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
• The QUaD Galactic Plane Survey II: A Compact Source Catalog
• 74 MHz Nonthermal Emission from Molecular Clouds: Evidence for a Cosmic Ray Dominated Region at the Galactic Center
• Prospects of 3D mapping of the Galactic Centre clouds with X-ray polarimetry
• A Constraint on the Organization of the Galactic Center Magnetic Field Using Faraday Rotation
• 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
• Electron Densities and Nitrogen Abundances in Ionized Gas Derived Using [NII] Fine-structure and Hydrogen Recombination lines
• Stochastic Acceleration of Cosmic Rays in the Central Molecular Zone of the Galaxy
• The Q/U Imaging ExperimenT: Polarization Measurements of the Galactic Plane at 43 and 95 GHz
• 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
• The connecting molecular ridge in the Galactic center
• Imprints of Molecular Clouds in Radio Continuum Images
• Suzaku Discovery of Twin Thermal Plasma from the Tornado Nebula
• Electroweak Dark Matter
• A survey for radio pulsars and transients in the 10 pc region around Sgr A*
• 4-8 GHz Fourier-domain Searches for Galactic Center Pulsars