Bibcode
Bellocchi, Enrica; Villar Martín, Montserrat; Cabrera-Lavers, Antonio; Emonts, Bjorn
Bibliographical reference
Astronomy and Astrophysics, Volume 626, id.A89, 25 pp.
Advertised on:
6
2019
Journal
Citations
3
Refereed citations
3
Description
Context. Ionized outflows are ubiquitous in non-radio-loud obscured
quasars (QSO2s) at different redshifts. However, the actual size of the
outflows and their efficiency for gas ejection and star formation
truncation are controversial. Large-scale (exceeding several kiloparsec)
extended radio structures might be necessary to identify (even to
trigger) outflow signatures across such large spatial scales.
Aims: We search for large-scale ionized outflows associated with six
optically selected QSO2 (five non-radio-loud and one radio-loud) at z
˜ 0.2-0.5, targeting objects with extended radio structures. We
also investigate the dynamical state of the QSO2 host galaxies.
Methods: We obtained data with the optical imager and long-slit
spectrograph (OSIRIS) mounted on the 10.4m Gran Telescopio Canarias
Spanish telescope (GTC) for these six QSO2 with the slit located along
the radio axis. We traced the gas kinematics with the
[OIII]λλ4959,5007 lines to investigate ionized outflows
and characterize the dynamical state of the host galaxies. This second
study was complemented with previously published spectroscopic data
obtained with the multimode focal reducer and low dispersion
spectrograph (FORS2) mounted on the Very Large Telescope (VLT) of 13
more QSO2 at similar z. Results: We identify ionized outflows in
four out of the six QSO2 observed with the GTC. The outflows are
spatially unresolved in two QSO2 and compact in a third (radial size of
R = 0.8 ± 0.3 kpc). Of particular interest is the radio-quiet
QSO2 SDSS 0741+3020 at z = 0.47. It is associated with a giant
˜112 kpc nebula. An ionized outflow probably induced by the radio
structures has been detected along the axis defined by the central
˜1″ radio structure, extending up to at least ˜4 kpc
from the active galactic nucleus (AGN). Turbulent gas (σ ˜
130 km s-1) has also been detected across the giant gas
nebula up to ˜40 kpc from the AGN. This turbulence may have been
induced by outflows triggered by the interaction between a so-far
undetected large-scale radio source and the nebula. Regarding the
dynamical state of the host galaxies, we find that the majority of the
QSO2 show v/σ < 1, implying that they are dominated by random
motions (so-called dispersion-dominated systems). Most (17 of 19) fall
in the area of the E/S0 galaxies in the dynamical diagram v/σ
versus σ. None are consistent with spiral or disk galaxies.
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