An X-Ray View of Star-Formation and Accretion in Normal Galaxies
Spectra for the optical counterparts of Chandra x-ray targets in the SDSS DR7 survey area
An object whose
ANCILLARY_TARGET1 value includes one or more of the bitmasks in the following table was targeted for spectroscopy as part of this ancillary target program. See SDSS bitmasks to learn how to use these values to identify objects in this ancillary target program.
|Program (bit name)||Bit number||Target Description||Number of Fibers||Number of Unique Primary Objects|
|CHANDRAV1||57||Positional match between SDSS DR7 photometric catalogs and the Chandra Source Catalog||1,367||1,268|
The extended wavelength coverage and improved throughput of the BOSS spectrograph enables studies of the relationship between star formation and black hole accretion in galaxies, using the key diagnostic feature of Hα/N[II] to z ~0.49
For this study, a target list was derived from the matched Chandra Source Catalog (CSC; version 1; Evans et al. 2010) and SDSS DR7 photometric catalogs. The following target selection steps were taken to identify targets from the list.
- Matches with Bayesian probability < 0.5 suffered from a larger number of multiple matches and were therefore discarded
The full selection criteria are described further in Haggard et al. (2010).
Because only sources with Chandra coverage were included, targets naturally have a non-uniform distribution over the DR7 footprint. To avoid overlap between 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 and retained in the other.
Munn, J. A., Monet, D.G., Levine, S. E., Canzian, B., Pier, J. R., Harris, H. C., Lupton, R. H., Ivezić, Ž., Hindsley, R. B., Hennessy, G. S., Schneider, D. P., & Brinkmann, J. 2004, AJ, 127, 3034 doi:10.1086/383292
Munn, J. A., Monet, D.G., Levine, S. E., Canzian, B., Pier, J. R., Harris, H. C., Lupton, R. H., Ivezić, Ž., Hindsley, R. B., Hennessy, G. S., Schneider, D. P., & Brinkmann, J. 2008, AJ, 136, 895 doi:10.1088/0004-6256/136/2/895
Rots, A., Budavári, T., Szalay, A., & Hagler, J. 2009, in Chandra’s First Decade of Discovery, ed. S. Wolk, A. Fruscione, D. Swartz, Washington, DC:National Academy of Sciences