تقرير
Improved Redshifts for DESI EDR Quasars
| العنوان: | Improved Redshifts for DESI EDR Quasars |
|---|---|
| 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. |