qian-yang/Skewt-QSO: Skewt-QSO

Quasar Photometric Redshifts and Candidate Selection

1. The photometric redshift (photo-z) estimation code: photoz
2. The candidate selection code: classification

Code Description

• The photo-z and classification code is written in R language (https://cran.r-project.org).
• The code depends on R packages, including sn, mvtnorm, pracma, data.table and bit64.
• To install a R package, for example sn, please run install.packages("package_name") in R.
• To run a .R file, please run source("filename.R") in R.
• 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

Reference

• https://arxiv.org/abs/1710.09155

Contact

• Any question please fell free to contact Qian (qianyang.astro@gmail.com)