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- 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
Star Forming Radio Galaxies
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.
| Primary Program | Sub-program (bit name) |
Bit Number | Target density (deg–2) |
Survey Area (deg2) |
|---|---|---|---|---|
| Star Forming Radio Galaxies | BLUE_RADIO | 56 | 0.4 | 10,000 |
Description
Joint analysis of SDSS, FIRST, and the NRAO VLA Sky Survey (NVSS; Condon et al. 1998) has shown that low redshift radio AGNs play an essential role in regulating the growth of massive galaxies (e.g. Best et al. 2005, 2007). However, much less is known about the detailed interplay of gas cooling and radio feedback in more luminous radio galaxies at higher redshifts. Current samples are incomplete, in particular for radio galaxies with significant on-going star formation.
Target Selection Details
This ancillary program selects radio galaxies with blue colors at z > 0.3 that would otherwise be missed from the LOWZ and CMASS samples. Galaxy targets were selected from DR7 according to the following criteria:
- extended morphology in SDSS photometry;
- clean ugriz model photometry and 17 < i < 19.9;
- ifib2 < 21.7;
- [(g - r) > 1.45] OR [(u - g) < 1.14 * (g - r)], where photometry is determined from model magnitudes.
The last criterion is designed to color-select objects at z > 0.3. We cross-matched this sample with the FIRST catalog (July 2008 version) and selected all objects within 3" of FIRST sources with fluxes > 3.5 mJy. Most targets were within 1.5". Finally, we rejected objects spectroscopically observed by SDSS-I/II, and objects meeting the target selection criterion for the galaxy samples. In total there were 4610 targets; we randomly sampled these to produce a final list of 4170 ancillary targets.
Primary contact
| Guinevere Kauffmann |
|---|
| MPA-Garching |
| gkauffmann -at- mpa-garching.mpg.de |
Other contacts
Christy Tremonti, Tim Heckman, Kevin Bundy, Yen-Ting Lin, Yan-Mei Chen
REFERENCES
Condon, J. J., et al., 1998, AJ, 115, 1693
doi:10.1086/300337
Best, P. N., et al., 2005, MNRAS, 362, 25
Best, P. N., et al., 2007, MNRAS, 379, 894