TY - JOUR
T1 - Evidence of ongoing AGN-driven feedback in a quiescent post-starburst E+A galaxy
AU - Baron, Dalya
AU - Netzer, Hagai
AU - Poznanski, Dovi
AU - Prochaska, Jason Xavier
AU - Förster Schreiber, Natascha M.
N1 - Publisher Copyright:
© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
PY - 2017/9/11
Y1 - 2017/9/11
N2 - Post-starburst E+A galaxies are thought to have experienced a significant starburst that was quenched abruptly. Their disturbed, bulge-dominated morphologies suggest that they are merger remnants. We present Echelle Spectrograph and Imager/Keck observations of SDSS J132401.63+454620.6, a post-starburst galaxy at redshift z = 0.125, with a starburst that started 400 Myr ago, and other properties, like the star formation rate consistent with what is measured in ultraluminous infrared galaxies (ULRIGs). The galaxy shows both zero velocity narrow lines, and blueshifted broader Balmer and forbidden emission lines (FWHM = 1350 ± 240 km s-1). The narrow component is consistent with LINER-like emission, and the broader component with Seyfert-like emission, both photoionized by an active galactic nucleus (AGN) whose properties we measure and model. The velocity dispersion of the broad component exceeds the escape velocity, and we estimate the mass outflowrate to be in the range 4-120 M⊙ yr-1. This is the first reported case of AGN-driven outflows, traced by ionized gas, in post-starburst E+A galaxies. We show, by ways of a simple model, that the observed AGN-driven winds can consistently evolve a ULIRG into the observed galaxy. Our findings reinforce the evolutionary scenario where the more massive ULIRGs are quenched by negative AGN feedback, evolve first to post-starburst galaxies, and later become typical red and dead ellipticals.
AB - Post-starburst E+A galaxies are thought to have experienced a significant starburst that was quenched abruptly. Their disturbed, bulge-dominated morphologies suggest that they are merger remnants. We present Echelle Spectrograph and Imager/Keck observations of SDSS J132401.63+454620.6, a post-starburst galaxy at redshift z = 0.125, with a starburst that started 400 Myr ago, and other properties, like the star formation rate consistent with what is measured in ultraluminous infrared galaxies (ULRIGs). The galaxy shows both zero velocity narrow lines, and blueshifted broader Balmer and forbidden emission lines (FWHM = 1350 ± 240 km s-1). The narrow component is consistent with LINER-like emission, and the broader component with Seyfert-like emission, both photoionized by an active galactic nucleus (AGN) whose properties we measure and model. The velocity dispersion of the broad component exceeds the escape velocity, and we estimate the mass outflowrate to be in the range 4-120 M⊙ yr-1. This is the first reported case of AGN-driven outflows, traced by ionized gas, in post-starburst E+A galaxies. We show, by ways of a simple model, that the observed AGN-driven winds can consistently evolve a ULIRG into the observed galaxy. Our findings reinforce the evolutionary scenario where the more massive ULIRGs are quenched by negative AGN feedback, evolve first to post-starburst galaxies, and later become typical red and dead ellipticals.
KW - Galaxies: Active
KW - Galaxies: Evolution
KW - Galaxies: General
KW - Galaxies: Interactions
UR - http://www.scopus.com/inward/record.url?scp=85023740086&partnerID=8YFLogxK
U2 - 10.1093/mnras/stx1329
DO - 10.1093/mnras/stx1329
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AN - SCOPUS:85023740086
SN - 0035-8711
VL - 470
SP - 1687
EP - 1702
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -