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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
Double-lobed Radio Quasars
Summary
Spectra of point-source objects near the midpoint of a double-lobed radio quasar in FIRST
Finding Targets
An object whose ANCILLARY_TARGET2 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 in ANCILLARY_TARGET2 |
Target Description | Target density (deg–2) |
|---|---|---|---|
| RADIO_2LOBE_QSO | 5 | Object near the midpoint of a double-lobed object identified in FIRST | 0.08 |
Description
Objects identified as optical point sources near the midpoint of pairs of FIRST radio sources are observed as potential double-lobed radio quasars. Such quasars are important for studying quasar evolution and interactions of radio jets with their local environment.
Primary contact
| Amy Kimball |
|---|
| CSIRO |
| Amy.Kimball -at- csiro.au |
Target Selection Details
Candidates are selected by identifying FIRST pairs with a separation less than 60" and no SDSS optical counterpart within 2" of either source. SDSS point sources located within a search radius that ranges between 2" and 5.3" (depending on the separation distance of the FIRST pair) from the midpoint are targeted. FIRST pairs with a flux ratio > 10 are rejected because true double-lobed sources are unlikely to have a high ratio of lobe-lobe flux density. The final catalog includes objects not spectroscopically observed with SDSS, not targeted in the main BOSS sample, and with 17.8 < i < 21.6 (Galactic extinction-corrected).