Spatially Resolved Very Large Array 74 MHz Observations Toward the Galactic Center

Details Spatially Resolved Very Large Array 74 MHz Observations Toward the Galactic Center Spatially Resolved Very Large Array 74 MHz Observations Toward the Galactic Center

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ans...324...17b&link_type=abstract

Astronomische Nachrichten, Supplementary Issue 1, Proceedings of the Galactic Center Workshop 2002 - The central 300 parsecs of

Astronomy and Astrophysics

Astronomy

18

Scientific paper

We present the highest resolution and sensitivity low frequency image (< 300 MHz) of the Galactic center to date using the Very Large Array at 74 MHz in its A, B, C, & D configurations. The resulting images have a resolution of 2.1' x 1.2' and a dynamic range of ~400. From these data we have been able to identify a region of enhanced 74 MHz emission about 5 degrees in extent that is coincident with the high density molecular gas surrounding the Galactic center known as the Central Molecular Zone. In addition to giving an unprecedented view of the extended nonthermal emission surrounding the Galactic center, the 74 MHz image shows deep free-free absorption across the Galactic center itself, as well as, part of the Galactic center radio lobe, and a number of H II regions in the field. This absorption is due to ionized thermal gas in front of, or in some cases embedded in, the nonthermal Galactic center (GC) emission. Such absorption allows us to unambiguously place some of the H II regions in the direction of the GC along the line of sight for the first time. The morphology, nature, and relationship to the Galactic center of the 74 MHz absorption and emission is discussed.

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