Accession Number:

ADA464418

Title:

Detection of Sagittarius A* at 330 MHz With the Very Large Array

Descriptive Note:

Journal article

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

2004-01-20

Pagination or Media Count:

5.0

Abstract:

The central radio-bright region of our Galaxy, known as the Sagittarius Complex, is composed of three major components the supernova remnant SNR Sgr A East, the Sgr A West H II region, and Sgr A, recently established as our Galaxys central massive black hole e.g., Ghez et al. 2000 Eckart et al. 2002. Models attempting to explain the emission from Sgr A fall into three broad classes. Emission is modeled as arising from thermal sources, such as a low-temperature accretion disk, from nonthermal sources such as a jet e.g., Melia Falcke 2001 and references therein, or from a mixture of the two. Such models are constrained primarily by the observed spectrum of Sgr A, but large gaps in frequency coverage exist. For this reason, filling in such gaps, as with the recent near-IR detections Ghez et al. 2004 Genzel et al. 2003, and extending the range of frequencies over which the source is observed is important in order to place additional observational constraints on these models.

Subject Categories:

  • Astronomy
  • Atomic and Molecular Physics and Spectroscopy
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE