Spectra of X-Ray and WISE AGN in Stripe 82

Contact

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Antonis Georgakakis
National Observatory of Athens
age@noa.gr

Observations were designed to conduct a census of obscured AGN that are typically missed in optical-based target selections but can be recovered by their X-ray emission or red mid-infrared colors. The X-ray sample was culled from the contiguous 15.6 square degree area of the Stripe 82 X-ray survey. WISE AGN candidates were selected from a wider area of 36.8 square degrees, and were selected based on WISE W1 – W2 color cuts. For both samples, SDSS counterparts to the X-ray and/or WISE AGN candidates had r < 23 or i < 22.5. Additional sources were added to the target list to fill the available fibers. The program consists of six plates spanning the RA range 14 - 28 degrees in Stripe 82. Each field was observed to twice the nominal eBOSS depth to increase the efficiency of spectral classification. The fits catalog with interpretation of the spectra can be downloaded here.

Finding Targets

An object whose EBOSS_TARGET2 value includes one or more of the bits 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 Unique Primary Objects
S82X_BRIGHT_TARGET 50 S82X_BRIGHT_TARGET 2927
S82X_XMM_TARGET 51 S82X_XMM_TARGET 925
S82X_WISE_TARGET 52 S82X_WISE_TARGET 1610
S82X_SACLAY_VAR_TARGET 53 S82X_SACLAY_VAR_TARGET 1122
S82X_SACLAY_BDT_TARGET 54 S82X_SACLAY_BDT_TARGET 958
S82X_SACLAY_HIZ_TARGET 55 S82X_SACLAY_HIZ_TARGET 119
S82X_RICHARDS15_PHOTOQSO_TARGET 56 S82X_RICHARDS15_PHOTOQSO_TARGET 181
S82X_PETERS15_COLORVAR_TARGET 57 S82X_PETERS15_COLORVAR_TARGET 1003
S82X_LSSTZ4_TARGET 58 S82X_LSSTZ4_TARGET 139
S82X_UNWISE_TARGET 59 S82X_UNWISE_TARGET 309
S82X_GTRADMZ4_TARGET 60 S82X_GTRADMZ4_TARGET 11
S82X_CLAGN1_TARGET 61 S82X_CLAGN1_TARGET 22
S82X_CLAGN2_TARGET 62 S82X_CLAGN2_TARGET 167

Caveats

N/A

REFERENCES

LaMassa, Stephanie M. et al., 2019, ApJ, 876, 1, 50