High-resolution studies of NGC 1275 and the galactic center
Thesis/Dissertation
·
OSTI ID:5135226
Radio studies of the parsec-scale structure in the centers of NGC 1275 and the Milky Way galaxy are presented. The nucleus of NGC 1275 was observed with VLBI at 1.3 cm twice per year for three years, with a resolution of 0.3 milliarcseconds, corresponding to {approx}0.1 pc. The galactic center was observed in the J = 1 {yields} 0 transition lines of H{sup 13} CN and HCO{sup +} with the BIMA array at the Hat Creek Radio Observatory, with a spatial resolution of 5{double prime}, corresponding to 0.2 pc, and spectral resolution of 4 km s{sup {minus}1}. The H{sup 13}CN and HCO{sup +} data, which were seen in emission from the 2-pc galactocentric ring and in absorption from galactic line-of-sight features, were compared with published H{sup 12}CN observations. The VLBI maps of NCG 1275 reveal that intensity flares are associated with the ejection of knots of emission moving at velocities {approx}0.5 h{sup {minus}1}c, while a slowly evolving outburst is associated with the emergence of diffuse emission expanding in a cone at velocity {approx}0.33 h{sup {minus}1} c. The galactic-center observations are also used to study previously identified foreground features that appear in absorption by HCO{sup +} and HCN.
- Research Organization:
- California Univ., Berkeley, CA (United States)
- OSTI ID:
- 5135226
- Country of Publication:
- United States
- Language:
- English
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