Does Feedback from Supermassive Blackhole Co-evolve With Host In Type 2 Quasars?

Abstract

The feedback from accretion of central supermassive black holes (SMBHs) is a hot topic in the co-evolution of the SMBHs and their host galaxies. By tracing the large scale outflow by the line profile and bulk velocity shift of $[\mathrm{O}\mathrm{III}]\lambda 5007$, the evolutionary role of outflow is studied here on a large sample of 221 type 2 quasars (QSO2s) extracted from Reyes et al. By following our previous study on local Seyfert 2 galaxies, the current spectral analysis on the SDSS spectroscopic database enables us to arrive at following results: (1) by using the Lick indices, we confirm that QSO2s are on average associated with younger stellar populations than Seyfert galaxies; (2) QSO2s with a stronger outflow are tend to be associated with a younger stellar population, which implies a coevolution between the feedback from SMBH and the host in QSO2s; (3) although an occupation at the high $L_{\mathrm{bol}}/L_{\mathrm{Edd}}$ end, the QSO2s follow the $L_{\mathrm{bol}}/L_{\mathrm{Edd}}$-$D_n(4000)$ sequence established from local, less-luminous Seyfert galaxies, which suggests a decrease of accretion activity of SMBH and feedback as the circumnuclear stellar population continuously ages.

15 pages, 8 figures, and 3 tables, accepted for publication in ApJ

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