Abstract
We discuss the technique and results of photometric measurements based on data from the WISE infrared survey for all Pan-STARRS1 objects under the assumption that the object coordinates are known (‘‘forced’’ photometry). The photometry has been performed by taking into account a complete point spread function model and a refined background model in the WISE survey. The fluxes or upper limits on the flux in the 3.4 and 4.6 \(\mu\)m bands have been measured for more than three billion optical objects in the northern sky at declinations \(\delta>{-}30^{\circ}\). These measurements will be used to identify galaxy clusters, active galactic nuclei, and quasars in the all-sky surveys of the eROSITA and Mikhail Pavlinsky ART-XC telescopes onboard the Spektr–Roentgen–Gamma space observatory.
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ACKNOWLEDGMENTS
I am grateful to R.A. Krivonos for his help in organizing access to the measurements on the Internet. Data from the publicly accessible Pan-STARRS1 archive and data from the NASA/IPAC Infrared Science Archive were used in this study.
Funding
This work was supported by the Russian Science Foundation (project no. 21-12-00343).
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APPENDIX
APPENDIX
The values of the flags presented in our table of photometric measurements are obtained by summing the values of the flags given below. The value of each individual flag can be obtained, as usual, from a bit-by-bit comparison with the total flag.
NOT_IN_FIELD \(=\) 1—the object is outside the unWISE coadd image field.
DUPLICATE \(=\) 2—the object is a duplicate of another object in the Pan-STARRS1 data. No photometric measurements for such an object are carried out.
BAD_PHOT \(=\) 4—there is no photometric measurement because the field is too crowded or a negative flux is obtained in the first pass (in this case, no measurements are carried out, the object flux is set equal to zero).
DO_NOT_FIT \(=\) 8—in the unWISE images on the WISE PSF angular scale there is no signal with a significance higher than \(1.5\sigma\), no measurements of the object flux are carried out, a \(2\sigma\) upper limit on the flux is given in the table.
EXT_SELECTED \(=\) 16—the object was selected as an extended one based on Pan-STARRS1 data, an attempt to determine the extent based on WISE data is made for it.
FIT_EXT \(=\) 32—the object was fitted by the extended source model.
FIT_DEVAUC \(=\) 64—the object was fitted by a centrally symmetric model with a de Vaucouleurs profile. At a positive value of the flag FIT_EXT and a negative value of the flag FIT_DEVAUC it was fitted by a centrally symmetric model with an exponential profile.
PHOTO_STAR \(=\) 128—the object is a star, according to the \((r-i)\) and \((r-W1)\) colors (see the text).
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Burenin, R.A. Forced Photometry for Pan-STARRS1 Objects Based on WISE Data. Astron. Lett. 48, 153–162 (2022). https://doi.org/10.1134/S1063773722030021
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DOI: https://doi.org/10.1134/S1063773722030021