Does Feedback from Supermassive Black Holes Coevolve with the Host in Type 2 Quasars?

• Published in: The Astrophysical journal 2023-06, Vol.950 (1), p.16
• Main Authors: Jin, S., Wang, J., Kong, M. Z., Shen, R. J., Zhang, Y. X., Xu, D. W., Wei, J. Y., Xie, Z.
• Format: Article
• Language: English
• Subjects: Active galactic nuclei; Astronomy & Astrophysics; Astrophysics; Black holes; Deposition; Feedback; Galaxies; Galaxy evolution; Outflow; Quasars; Seyfert galaxies; Sky surveys (astronomy); Spectral analysis; Spectrum analysis; Stellar populations; Supermassive black holes
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/1538-4357/acce37

The feedback from the accretion of central supermassive black holes (SMBHs) is a hot topic in the coevolution of SMBHs and their host galaxies. By tracing the large-scale outflow using the line profile and bulk velocity shift of [O iii ] λ 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 Sloan Digital Sky Survey spectroscopic database enables us to arrive at the following results: (1) by using the Lick indices, we confirm that QSO2s are, on average, more frequently associated with younger stellar populations than Seyfert galaxies; (2) QSO2s with a stronger outflow tend to be associated with a younger stellar population, which implies a coevolution between the feedback from SMBHs and the host in QSO2s; (3) although occupied at the high L bol / L Edd end, the QSO2s follow the L bol / L Edd - D n (4000) sequence established from local, less-luminous Seyfert galaxies, which suggests a decrease of the accretion activity of SMBHs and also of feedback as the circumnuclear stellar population continuously ages.