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Quasar Photometric Redshifts and Candidate Selection Based on Optical (and Mid-Infrared) Photometric Data

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Skewt-QSO

Quasar Photometric Redshifts and Candidate Selection

  • The photometric redshift (photo-z) estimation code: photoz

  • The candidate selection code: classification

  • The photo-z and classification code is written in R language (https://cran.r-project.org), and depends on R packages, including sn, mvtnorm, pracma, data.table and bit64.

  • To install a R package, for example sn, please run install.packages("sn") in R.

  • To run a .R file, please run source("filename.R") in R.

Flux

  • The flux in the input files are calculated via IDL codes in the get_flux directory.

Photo-z results

  • The SDSS, SDSS-WISE, PS1-WISE, and DECaLS-WISE photo-z results are in files in the photoz/result directory.
  • SDSS: photoz_SDSS.csv.zip
  • SDSS-WISE: photoz_skewt_SDSS_WISE.csv.zip
  • PS1-WISE: photoz_skewt_PS1_WISE.csv.zip
  • DECaLS-WISE: photoz_skewt_DECaLS_WISE.csv.zip

Photometric quasars in the SDSS Stripe 82 region

  • In region 340< R.A.<45 deg and −1.25<Decl.<1.25 deg (roughly b < −50 deg). Photometry used: DECaLS (DR3) and unWISE photometry. File: catalog/photoz_qso_S82.fits

  • Any question please fell free to contact Qian ([email protected]).

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Quasar Photometric Redshifts and Candidate Selection Based on Optical (and Mid-Infrared) Photometric Data

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