Alma Observations of a Candidate Molecular Outflow in an Obscured Quasar

Sun, Alexander H.; Greene, Jenny E.; Zakamska, Nadia L.; Nesvadba, N. P. H.

doi:10.1088/0004-637x/790/2/160

Cited by 63 publications

(91 citation statements)

References 96 publications

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“…from previous studies in literature (Greene et al, 2012;Cicone et al, 2014;Harrison et al, 2014;Sun et al, 2014;Brusa et al, 2015;Cresci et al, 2015;Feruglio et al, 2015), we clearly observe a relation between outflow properties and AGN luminosities (L AGN ). The velocity and mass rate of the fast gas increase with the L AGN supporting the scenario that these outflows are AGN-driven and their properties depend on the AGN activity.…”

Section: Ionized Outflow Propertiessupporting

confidence: 82%

Star Formation Quenching in Quasar Host Galaxies

Carniani

2017

Front. Astron. Space Sci.

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Galaxy evolution is likely to be shaped by negative feedback from active galactic nuclei (AGN). In the whole range of redshifts and luminosities studied so far, galaxies hosting an AGN frequently show fast and extended outflows consisting in both ionized and molecular gas. Such outflows could potentially quench the start formation within the host galaxy, but a clear evidence of negative feedback in action is still missing. Hereby I will analyse integral-field spectroscopic data for six quasars at z ∼ 2.4 obtained with SINFONI in the H-and K-band. All the quasars show [OIII]λ5007 line detection of fast, extended outflows. Also, the high signal-to-noise SINFONI observations allow the identification of faint narrow Hα emission (FWHM < 500 km/s), which is spatially extended and associated with star formation in the host galaxy. On paper fast outflows are spatially anti-correlated with star-formation powered emission, i.e., star formation is suppressed in the area affected by the outflow. Nonetheless as narrow, spatially-extended Hα emission, indicating star formation rates of at least 50-100 M ⊙ yr −1 , has been detected, either AGN feedback is not affecting the whole host galaxy, or star formation is completely quenched only by several feedback episodes. On the other hand, a positive feedback scenario, supported by narrow emission in Hα extending along the edges of the outflow cone, suggests that galaxy-wide outflows could also have a twofold role in the evolution of the host galaxy. Finally, I will present CO(3-2) ALMA data for three out of the six QSOs observed with SINFONI. Flux maps obtained for the CO(3-2) transition suggest that molecular gas within the host galaxy is swept away by fast winds. A negative-feedback scenario is supported by the inferred molecular gas mass in all three objects, which is significantly below what observed in non-active main-sequence galaxies at high-z.

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Section: Ionized Outflow Propertiessupporting

confidence: 82%

Star Formation Quenching in Quasar Host Galaxies

Carniani

2017

Front. Astron. Space Sci.

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“…10 the outflow kinetic energy is plotted against the AGN bolometric luminosity. We included in the figure A148, page 12 of 15 other known ionized (Greene et al 2012;Harrison et al 2014;Carniani et al 2015;Brusa et al 2015a;Cresci et al 2015) and molecular (squares, Cicone et al 2014;Sun et al 2014;Feruglio et al 2015) outflows. The dotted, dashed, and solid lines represent the fraction of AGN bolometric luminosity in the form of the outflow power at 0.1%, 5%, and 100%, respectively.…”

Section: Source Of the Outflowsmentioning

confidence: 99%

Tracing outflows in the AGN forbidden region with SINFONI

Kakkad

Mainieri

Padovani

et al. 2016

A&A

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Context. Active galactic nucleus (AGN) driven outflows are invoked in numerical simulations to reproduce several observed properties of local galaxies. The z > 1 epoch is of particular interest as it was during this time that the volume averaged star formation and the accretion rate of black holes were at their maximum. Radiatively driven outflows are therefore believed to be common during this epoch. Aims. We aim to trace and characterize outflows in AGN hosts with high mass accretion rates at z > 1 using integral field spectroscopy.We obtain spatially resolved kinematics of the [O iii] λ5007 line in two targets which reveal the morphology and spatial extension of the outflows. Methods. We present SINFONI observations in the J band and the H + K band of five AGNs at 1.2 < z < 2.2. To maximize the chance of observing radiatively driven outflows, our sample was pre-selected based on peculiar values of the Eddington ratio and the hydrogen column density of the surrounding interstellar medium. We observe high velocity (∼600−1900 km s −1 ) and kiloparsec scale extended ionized outflows in at least three of our targets, using [O iii] λ5007 line kinematics tracing the AGN narrow line region. We estimate the total mass of the outflow, the mass outflow rate, and the kinetic power of the outflows based on theoretical models and report on the uncertainties associated with them. Results. We find mass outflow rates of ∼1−10 M /yr for the sample presented in this paper. Based on the high star formation rates of the host galaxies, the observed outflow kinetic power, and the expected power due to the AGN, we infer that both star formation and AGN radiation could be the dominant source for the outflows. The outflow models suffer from large uncertainties, hence we call for further detailed observations for an accurate determination of the outflow properties to confirm the exact source of these outflows.

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“…So far, there are only a few observations of both molecular and ionised AGN-driven outflows in the same galaxy: SDSS J1356+1026 is an example of an obscured QSO where molecular and ionised outflows have different properties, that is outflow rates, velocities, radii, morphologies, and time scales (Greene et al 2012;Sun et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Ionised outflows inz~ 2.4 quasar host galaxies

Carniani

Marconi

Maiolino

et al. 2015

A&A

224

340

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Aims. Outflows driven by active galactic nuclei (AGN) are invoked by galaxy evolutionary models to quench star formation and to explain the origin of the relations observed locally between super-massive black holes and their host galaxies. We here aim to detect extended ionised outflows in luminous quasars, where we expect the highest activity both in star formation and in black-hole accretion. Currently, there are only a few studies based on spatially resolved observations of outflows at high redshift, z > 2. Methods. We analysed a sample of six luminous (L > 10 47 erg/s) quasars at z ∼ 2.4, observed in H-band using the near-IR integral field spectrometer SINFONI at the VLT. We performed a kinematic analysis of the [O] emission line at λ = 5007 Å. Results. We detect fast, spatially extended outflows in five out of six targets.[O]λ5007 has a complex gas kinematic, with blueshifted velocities of a few hundreds of km s −1 and line widths up to 1500 km s −1 . Using the spectroastrometric method, we infer a size of the ionised outflows of up to ∼2 kpc. The properties of the ionised outflows, mass outflow rate, momentum rate, and kinetic power, are correlated with the AGN luminosity. The increase in outflow rate with increasing AGN luminosity is consistent with the idea that a luminous AGN pushes away the surrounding gas through fast outflows that are driven by radiation pressure, which depends on the emitted luminosity. Conclusions. We derive mass outflow rates of about 6−700 M yr −1 for our sample, which are lower than those observed in molecular outflows. The physical properties of ionised outflows show dependences on AGN luminosity that are similar to those of molecular outflows, but indicate that the mass of ionised gas is lower than that of molecular outflows. Alternatively, this discrepancy between ionised and molecular outflows could be explained with different acceleration mechanisms.

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Alma Observations of a Candidate Molecular Outflow in an Obscured Quasar

Cited by 63 publications

References 96 publications

Star Formation Quenching in Quasar Host Galaxies

Star Formation Quenching in Quasar Host Galaxies

Tracing outflows in the AGN forbidden region with SINFONI

Ionised outflows inz~ 2.4 quasar host galaxies

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