تقرير
Improved Redshifts for DESI EDR Quasars
العنوان: | Improved Redshifts for DESI EDR Quasars |
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المؤلفون: | Wu, Qiaoya, Shen, Yue |
سنة النشر: | 2023 |
المجموعة: | Astrophysics |
مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics |
الوصف: | The Dark Energy Spectroscopic Instrument (DESI) survey will provide optical spectra for $\sim 3$ million quasars. Accurate redshifts for these quasars will facilitate a broad range of science applications. Here we provide improved systemic redshift estimates for the $\sim 95$k quasars included in the DESI Early Data Release (EDR), based on emission-line fits to the quasar spectra. The majority of the DESI pipeline redshifts are reliable. However, $\sim 19\%$ of the EDR quasars have pipeline redshifts that deviate from our new redshifts by $>500\,{\rm km\,s^{-1}}$. We use composite quasar spectra to demonstrate the improvement of our redshift estimates, particularly at $z>1$. These new redshifts are available at \url{https://github.com/QiaoyaWu/DESI_EDR_qsofit/blob/main/DESI_EDR_Aug29_redshift_only.fits}. Comment: 3 pages, 1 figure. Submitted to RNAAS, comments welcome! |
نوع الوثيقة: | Working Paper |
URL الوصول: | http://arxiv.org/abs/2308.15586 |
رقم الأكسشن: | edsarx.2308.15586 |
قاعدة البيانات: | arXiv |
الوصف غير متاح. |