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Georgia State University

GSU Astronomy Professors Publish on Be Stars and Black Holes

Galaxy Centaurus A and its active galactic nucleus (visible as a bright white spot). Image courtesy of nasamarshall on Flickr. (CC BY-NC-ND 2.0)

Several Georgia State University Astronomy students and faculty have recently published articles in the Astrophysical Journal. Check out their research:

Peters, G. J., Pewett, T. D., Gies, D. R., Touhami, Y. N., & Grundstrom, E. D. (2013). Far-ultraviolet detection of the suspected subdwarf companion to the Be star 59 Cygni. Astrophysical Journal, 765(1). doi:10.1088/0004-637X/765/1/2

Georgia State professor Douglas R. Gies, postdoc Yamina N. Touhami, and Ph.D. candidate Tiffany D. Pewett published on the detection of a subdwarf companion star to the Be star 59 Cygni. Their discovery, derived from different sets of spectral data on 59 Cygni, sheds light on the nature of rapidly-rotating Be stars.

Grier, C. J., Peterson, B. M., Horne, K., Bentz, M. C., Pogge, R. W., Denney, K. D., … Van Saders, J. L. (2013). The structure of the broad-line region in active galactic nuclei. I. Reconstructed velocity-delay maps. Astrophysical Journal, 764(1). doi:10.1088/0004-637X/764/1/47

Georgia State professor Misty C. Bentz published on observations of five active galactic nuclei, highly luminous centers of galaxies believed to be caused by supermassive black holes. Velocity-delay maps, which provide information on the structure and motion of the mapped black holes, are difficult to calculate; this paper both adds to the number of maps and demonstrates their reliability as measurements.