S20A0009abst

S20A0009

We propose optical spectroscopic observations of extremely radio-loud AGN residing in the low-mass galaxies. Recent Subaru/HSC strategic survey revealed optically-faint radio galaxies (RG) down to g ∼ 26, opening the new parameter space of extremely radio-loud AGN with radio-loudness parameter of logR_rest = log(f_{1.4\ GHz}/f_{g\ band}) >4. They are called extremely radio-loud galaxies (ERGs). ERGs show completely different properties compared to the conventional RGs: ERGs follow SF main-sequence, and are prominent candidates in the super-Eddington accretion phase, and if the sample is limited at z<1, ERGs reside in low-mass galaxies with log(M_⋆/M_⊙)<10. Therefore, ERGs are candidates of very rapidly growing black holes with super-Eddington accretion before the feedback process is in place. Since they are super-Eddington candidates with the powerful radiation and jet, the outflow features would be expected. Taking this advantage, we will constrain the effective AGN feedback timescale by measuring the outflow velocity of [OIII]λ5007 and how much the central BHs can acquire their mass during the timescale of t_FB< galaxy size/velocity, and [OII] line and 4000Å break will give us the starformation and stellar population information to check the level of AGN feedback.

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