Browsing by Author "Villar-Martin, M."

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    An infrared view of AGN feedback in a type-2 quasar: the case of the Teacup galaxy
    (2017) Ramos Almeida, C.; Piqueras Lopez, J.; Villar-Martin, M.; Bessiere, P. S.
    We present near-infrared integral field spectroscopy data obtained with Very Large Telescope/ Spectrograph for INtegral Field Observations in the Near Infrared (SINFONI) of ` the Teacup galaxy'. The nuclear K-band (1.95-2.45 mu m) spectrum of this radio-quiet type-2 quasar reveals a blueshifted broad component of FWHM similar to 1600-1800 km s(-1) in the hydrogen recombination lines (Pa alpha, Br delta and Br gamma ) and also in the coronal line [Si VI] lambda 1.963 mu m. Thus, the data confirm the presence of the nuclear ionized outflow previously detected in the optical range and reveal its coronal counterpart. Both the ionized and coronal nuclear outflows are resolved, with seeing-deconvolved full widths at half-maximum of 1.1+/-0.1 and 0.9+/-0.1 kpc along position angle (PA) +/-72 degrees-74 degrees. This orientation is almost coincident with the radio axis (PA = 77 degrees), suggesting that the radio jet could have triggered the nuclear outflow. In the case of the H2 lines, we do not require a broad component to reproduce the profiles, but the narrow lines are blueshifted by similar to 50 km s(-1) on average from the galaxy systemic velocity. This could be an indication of the presence of a nuclear molecular outflow, although the bulk of the H2 emission in the inner similar to 2 arcsec (similar to 3 kpc) of the galaxy follows a rotation pattern. We find evidence for kinematically disrupted gas (FWHM > 250 km s(-1)) at up to 5.6 kpc from the AGN, which can be naturally explained by the action of the outflow. The narrow component of [Si VI] is redshifted with respect to the systemic velocity, unlike any other emission line in the K-band spectrum. This indicates that the region where the coronal lines are produced is not cospatial with the narrow-line region.
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    Galaxy-wide radio-induced feedback in a radio-quiet quasar
    (2017) Villar-Martin, M.; Emonts, B.; Cabrera Lavers, A.; Tadhunter, C.; Mukherjee, D.; Humphrey, A.; Zaurin, J. Rodriguez; Ramos Almeida, C.; Perez Torres, M.; Bessiere, P.
    We report the discovery of a radio-quiet type 2 quasar (SDSS J165315.06+234943.0 nick-named the 'Beetle' at z = 0.103) with unambiguous evidence for active galactic nucleus (AGN) radio-induced feedback acting across a total extension of similar to 46 kpc and up to similar to 26 kpc from the AGN. To the best of our knowledge, this is the first radio-quiet system where radio-induced feedback has been securely identified at >> several kpc from the AGN. The morphological, ionization and kinematic properties of the extended ionized gas are correlated with the radio structures. We find along the radio axis (a) enhancement of the optical line emission at the location of the radio hotspots (b) turbulent gas kinematics (FWHM similar to 380-470 km s(-1)) across the entire spatial range circumscribed by them (c) ionization minima for the turbulent gas at the location of the hot spots, (d) high temperature T-e greater than or similar to 1.9 x 10(4) K at the NE hotspot. Turbulent gas is also found far from the radio axis, similar to 25 kpc in the perpendicular direction. We propose a scenario in which the radio structures have perforated the interstellar medium of the galaxy and escaped into the circumgalactic medium. While advancing, they have interacted with in situ gas modifying its properties. Our results show that jets of modest power can be the dominant feedback mechanism acting across huge volumes in radio-quiet systems, including highly accreting luminous AGNs, where radiative mode feedback may be expected.