Computer Science
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt.........9c&link_type=abstract
Thesis (PH.D.)--STANFORD UNIVERSITY, 1995.Source: Dissertation Abstracts International, Volume: 56-06, Section: B, page: 3240.
Computer Science
14
Radio Emission
Scientific paper
A near infrared search has been conducted for the hot, young stars which may be the primary ionization mechanism of thermal radio emission regions near the Galactic Center (GC). Observations in July 1992, and June 1993 at the Anglo-Australian Observatory (AAO), with the facility Infrared Imaging Spectrometer (IRIS), resulted in the discovery of hot stars near the GC. A combination of broad band, B_{r gamma} (2.166 micron) and HeI (2.059 micron) emissions images revealed the location of these stars as adjacent to or embedded in several thermal radio emission regions. A newly discovered cluster of these hot stars contains a minimum of 17 stars, 13 of which have definite B_{r gamma } and HeI (2.112/3 micron) emission. Data on the more studied cluster of stars, AFGL 2004, located adjacent to G0.15-0.05 revealed four stars with significant emission lines. Observations of several compact regions of radio emission around Sgr A, resulted in the discovery of six additional emission line stars scattered throughout the region. Two of these stars are embedded within their radio emission regions; these stars provide the first direct evidence of stellar ionization of the radio emission regions. Many of stars appear to be Wolf-Rayet stars which are extremely hot, luminous stars (~10 ^6{L/}_odot ). They provide the majority of the ionizing radiation needed for their associated radio emission regions, but their distances preclude them from being the only ionizing source. However, there could still be hot stars embedded in the radio emission regions which are not detected by our observations because they lack infrared emission lines. Maps of diffuse B_{r gamma} and HeI emission coincident with the radio filaments were also obtained and are used to estimate the extinction and temperature of these regions.
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