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X-Ray View of Star-Formation and Accretion in Normal Galaxies


Spectra for the optical counterparts of Chandra x-ray targets in a 7,650 survey area

Finding Targets

An object whose ANCILLARY_TARGET1 value include one or more of the bitmasks in the following table was targeted for spectroscopy as part of this ancillary target program. See SDSS-III bitmasks to learn how to use these values to identify objects in this ancillary target program.

(bit name)
Bit Number Target density
CHANDRAV1 57 0.2


The extended wavelength coverage and improved throughput of BOSS relative to SDSS enable studies of the relationship between star formation and black hole accretion in galaxies using the key diagnostic Hα/N[II] to z ~0.49.

Primary contact

Daryl Haggard
Northwestern University
dhaggard -at-

Other contacts

Paul J. Green, Niel Brandt, Adam Myers, Anca Constantin

Target Selection Details

Because only sources with Chandra coverage were included, the target have a non-uniform distribution over the DR7 footprint. To avoid overlap between the targets selected for this program and the program "Remarkable X-ray Source Populations", the target lists were cross-correlated (using a 2" match radius) and 754 duplicates were removed from this program designation.


Evans, I. N., et al., 2010, ApJS, 189, 37 doi:10.1088/0067-0049/189/1/37
Rots, A., et al., 2009, in Chandra's First Decade of Discovery, ed. S. Wolk, A. Fruscione, D. Swartz
Munn, J. A., et al., 2004, AJ, 127, 3034 doi:10.1086/383292
Munn, J. A., et al., 2008, AJ, 136, 895 doi:10.1088/0004-6256/136/2/895
Haggard, D., et al., 2010, ApJ, 723, 1447 doi:10.1088/0004-637X/723/2/1447