- Ancillary Targets
- Transient Universe in Stripe 82
- Host Galaxies of SDSS-II SNe
- BCGs in
Stripe 82 - High-Quality LRG spectra
- Reddened
Quasars - No Quasar Left Behind
- Variability-Selected Quasars
- K-band Selected Quasars
- Low-Mass Stars and Brown Dwarfs
- Low-Mass Binary Stars
- White Dwarfs and Hot Subdwarfs
- Distant Halo
Giants - Bright
Galaxies - High-Energy Blazars in Optical
- An X-Ray View Star Formation
- Remarkable X-Ray Sources
- Star-Forming Radio Galaxies
- Galaxies Near QSO Sight Lines
- Luminous Blue Galaxies
- BAL Quasar Variability
- Variable QSO Absorption
- Double-Lobed Radio QSOs
- High-Redshift Quasars
- High-z QSOs in SDSS/UKIDSS
- BOSS Targeting
- Algorithms
X-Ray View of Star-Formation and Accretion in Normal Galaxies
Summary
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.
Program (bit name) |
Bit Number | Target density (deg–2) |
---|---|---|
CHANDRAV1 | 57 | 0.2 |
Description
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- northwestern.edu |
Other contacts
Paul J. Green, Niel Brandt, Adam Myers, Anca Constantin
Target Selection Details
- 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.
- High quality matches underwent visual inspection in X-ray and
optical imaging and were required to have positional
matches between the SDSS DR7 catalog and the CSC as defined by the
Rots et al. (2009) matching method that
incorporates positions, positional errors, and sky coverage.
- Matches with Bayesian probability < 0.5 suffer from a larger number of multiple matches and are discarded.
- Targets were required to have model magnitude 16.5 < r < 20.75
- Targets were also required to have Chandra off-axis angles < 10'.
- Objects with existing SDSS spectroscopy, proper motions from Munn et al. (2004, 2008) exceeding 11 mas/year (selection criteria are described further in Haggard et al. 2010), or poor-quality X-ray measurements are removed from the sample.
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.
REFERENCES
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