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Extremely Red Quasars (ERQs) are thought to represent a brief episode ofyoung quasar and galactic evolution characterized by rapid outflows andobscured growth due to dusty environments. We use new redshift measurementsfrom CO and Ly$\alpha$ emission-lines to better constrain outflow velocitiesfrom previous line measurements. We present sample of 82 ERQs, and the analysisconfirms that ERQs have a higher incidence of large CIV blueshifts, accompaniedby large Rest Equivalent Widths (REWs) and smaller line widths than bluequasars. We find that strong blueshifts (>2000 km s$^{-1}$) are present in12/54 (22.22 per cent) of ERQs with the most robust redshift indicators. Atleast 4 out of 15 ERQs in the sample also have blueshifts in their H$\beta$ andlow-ionization UV lines ranging from $-$500 to $-$1500 km s$^{-1}$. ERQs withstrong CIV blueshifts are substantially offset in CIV REW and Full-Width atHalf-Maximum (FWHM) from typical blue quasars in the same velocity range. ERQshave average values of REW = 124 A and FWHM = 5274 km s$^{-1}$, while bluequasars have REW = 24 A and FWHM = 6973 km s$^{-1}$. The extreme nature of theoutflows in ERQs might explain some of their other spectral properties, such asthe large CIV REWs and peculiar wingless profiles owing to more extendedbroad-line regions participating in outflows. The physical reasons for theextreme outflow properties of ERQs are unclear; however, larger Eddingtonratios and/or softer ionizing spectra incident on the outflow gas cannot beruled out.

Accurate Systemic Redshifts and Outflow Speeds for Extremely Red Quasars (ERQs)