NOAO >   Observing Info >   Approved Programs >   2012A-0112

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Proposal Information for 2012A-0112


PI: Peter Jonker, Harvard-Smithsonian CfA & SRON, pjonker@cfa.harvard.edu
Address: HEAD, 60 garden street, Cambridge, MA 02138, USA

CoI: Robert Hynes, LSU
CoI: Eva Ratti, SRON
CoI: Daniel Steeghs, Warwick University

Title: Completing the Galactic Bulge Survey: categorizing the plethora of faint X-ray sources in the Galactic Bulge

Abstract: We propose to obtain spectra of optical counterparts to X-ray sources discovered in our Galactic Bulge survey (GBS). Using Chandra images we have already found 1234 sources in about 2/3 of the total survey area, and 801 of these X-ray sources have 1 or more candidate counterparts as identified on our existing Blanco images. The plethora of faint X-ray sources will constrain binary evolution models by way of a number count. We expect to find (quiescent and/or eclipsing) neutron star and black hole LMXBs. These are important for neutron star and black hole mass measurements. For these goals we need to identify all sources via optical spectroscopy. Chandra will obtain X-ray images of the remaining 1/3 of the survey area. We here propose to obtain Gemini- GMOS and SOAR-HTS spectra of the (faint) counterparts to some of the newly found Chandra sources. The Gemini (3n) and SOAR (4n) time has been awarded via the Chandra TAC.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2012A-0112

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