The First Chandra Field

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Before the official first-light images, the Chandra X-ray Observatory obtained an X-ray image of the field to which its focal plane was first exposed. We describe this historic observation and report our study of the first Chandra field. Chandra's Advanced CCD Imaging Spectrometer (ACIS) detected 15 X-ray sources, the brightest being dubbed ''Leon X-1'' to honor the Chandra Telescope Scientist, Leon Van Speybroeck. Based upon our analysis of the X-ray data and spectroscopy at the European Southern Observatory (ESO; La Silla, Chile), we find that Leon X-1 is a Type-1 (unobscured) active galactic nucleus (AGN) at a redshift z = ... continued below

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39 pages

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Weisskopf, Martin C.; Aldcroft, Thomas L.; Cameron, Robert A.; Gandhi, Poshak; Foellmi, Cedric; Elsner, Ronald F. et al. September 9, 2005.

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Before the official first-light images, the Chandra X-ray Observatory obtained an X-ray image of the field to which its focal plane was first exposed. We describe this historic observation and report our study of the first Chandra field. Chandra's Advanced CCD Imaging Spectrometer (ACIS) detected 15 X-ray sources, the brightest being dubbed ''Leon X-1'' to honor the Chandra Telescope Scientist, Leon Van Speybroeck. Based upon our analysis of the X-ray data and spectroscopy at the European Southern Observatory (ESO; La Silla, Chile), we find that Leon X-1 is a Type-1 (unobscured) active galactic nucleus (AGN) at a redshift z = 0.3207. Leon X-1 exhibits strong Fe II emission and a broad-line Balmer decrement that is unusually flat for an AGN. Within the context of the Eigenvector-1 correlation space, these properties suggest that Leon X-1 may be a massive ({ge} 10{sup 9} M{sub {circle_dot}}) black hole, accreting at a rate approaching its Eddington limit.

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39 pages

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  • Journal Name: Astrophysical Journal; Journal Volume: 637

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  • Report No.: SLAC-PUB-11470
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878430
  • Archival Resource Key: ark:/67531/metadc878902

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  • September 9, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • July 25, 2017, 4:13 p.m.

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Weisskopf, Martin C.; Aldcroft, Thomas L.; Cameron, Robert A.; Gandhi, Poshak; Foellmi, Cedric; Elsner, Ronald F. et al. The First Chandra Field, article, September 9, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc878902/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.