Star formation in high-redshift quasars: excess [O <scp>ii</scp>] emission in the radio-loud population

Kalfountzou, E.; Jarvis, Matt J.; Bonfield, D. G.; Hardcastle, M. J.

doi:10.1111/j.1365-2966.2012.22093.x

Cited by 48 publications

(57 citation statements)

References 116 publications

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“…This phenomenon is highlighted by the quenched central regions without star formation, which have different shapes as a result of the different wind inclinations. However, our results seem to conflict with observational indications that jets are more likely to cause positive feedback than radio quiet quasars (Kalfountzou et al 2012). Zinn et al (2013) even compares radio-loud and radio quiet galaxies with similar luminosities and find that the galaxies with jets have higher SFR's.…”

Section: Discussioncontrasting

confidence: 95%

Feedback by AGN Jets and Wide-angle Winds on a Galactic Scale

Dugan

Gaibler

Silk

2017

ApJ

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To investigate the differences in mechanical feedback from radio-loud and radio-quiet Active Galactic Nuclei (AGN) on the host galaxy, we perform 3D AMR hydrodynamic simulations of wide angle, radioquiet winds with different inclinations on a single, massive, gas-rich disk galaxy at a redshift of 2-3. We compare our results to hydrodynamic simulations of the same galaxy but with a jet. The jet has an inclination of 0• (perpendicular to the galactic plane), and the winds have inclinations of 0 • , 45• , and 90• . We analyze the impact on the host's gas, star formation, and circum-galactic medium. We find that jet feedback is energy-driven and wind feedback is momentum-driven. In all the simulations, the jet or wind creates a cavity mostly devoid of dense gas in the nuclear region where star formation is then quenched, but we find strong positive feedback in all the simulations at radii greater than 3 kpc. All four simulations have similar SFRs and stellar velocities with large radial and vertical components. However, the wind at an inclination of 90• creates the highest density regions through ram pressure and generates the highest rates of star formation due to its ongoing strong interaction with the dense gas of the galactic plane. With increased wind inclination, we find greater asymmetry in gas distribution and resulting star formation. Our model generates an expanding ring of triggered star formation with typical velocity of order 1/3 of the circular velocity, superimposed on the older stellar population. This should result in a potentially detectable blue asymmetry in stellar absorption features at kpc scales.

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Section: Discussioncontrasting

confidence: 95%

Feedback by AGN Jets and Wide-angle Winds on a Galactic Scale

Dugan

Gaibler

Silk

2017

ApJ

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“…Bower et al 2006;Werner et al 2013;Chen et al 2013b). However, a positive radio mode feedback has also been suggested (Silk & Nusser 2010;Kalfountzou et al 2012Kalfountzou et al , 2014Gaibler et al 2012). In this scenario, the radio jets drive shocks in the interstellar medium which enhance the star formation, something that has been observed for decades now (e.g.…”

Section: Introductionmentioning

confidence: 99%

Herschel-ATLAS: the connection between star formation and AGN activity in radio-loud and radio-quiet active galaxies

Gürkan¹,

Hardcastle²,

Jarvis³

et al. 2015

Mon. Not. R. Astron. Soc.

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We examine the relationship between star formation and AGN activity by constructing matched samples of local (0 < z < 0.6) radio-loud and radio-quiet AGN in the Herschel-ATLAS fields. Radio-loud AGN are classified as high-excitation and low-excitation radio galaxies (HERGs, LERGs) using their emission lines and WISE 22-µm luminosity. AGN accretion and jet powers in these active galaxies are traced by [OIII] emission-line and radio luminosity, respectively. Star formation rates (SFRs) and specific star formation rates (SSFRs) were derived using Herschel 250-µm luminosity and stellar mass measurements from the SDSS−MPA-JHU catalogue. In the past, star formation studies of AGN have mostly focused on high-redshift sources to observe the thermal dust emission that peaks in the far-infrared, which limited the samples to powerful objects. However, with Herschel we can expand this to low redshifts. Our stacking analyses show that SFRs and SSFRs of both radio-loud and radioquiet AGN increase with increasing AGN power but that radio-loud AGN tend to have lower SFR. Additionally, radio-quiet AGN are found to have approximately an order of magnitude higher SSFRs than radio-loud AGN for a given level of AGN power. The difference between the star formation properties of radio-loud and -quiet AGN is also seen in samples matched in stellar mass.

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“…Gaibler et al 2012;Wagner et al 2012) and observations (e.g. Kalfountzou et al 2012Kalfountzou et al , 2014b reveal that jet activity can actually trigger star formation by generating some high density, low temperature cavities embedded in the cocoon around the jet (e.g. Antonuccio-Delogu & Silk 2010; Silk & Nusser 2010; Silk et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, it is also unclear how these processes depend on luminosity and radio-loudness and how they are observationally affected by orientation (e.g. Rosario et al 2012;Page et al 2012;Kalfountzou et al 2012Kalfountzou et al , 2014bChen et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Observational evidence that positive and negative AGN feedback depends on galaxy mass and jet power

Kalfountzou

Stevens

Jarvis

et al. 2017

Monthly Notices of the Royal Astronomical Society

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Several studies support the existence of a link between the AGN and star formation activity. Radio jets have been argued to be an ideal mechanism for direct interaction between the AGN and the host galaxy. A drawback of previous surveys of AGN is that they are fundamentally limited by the degeneracy between redshift and luminosity in flux-density limited samples. To overcome this limitation, we present far-infrared Herschel observations of 74 radio-loud quasars (RLQs), 72 radio-quiet quasars (RQQs) and 27 radio galaxies (RGs), selected at 0.9 < z < 1.1 which span over two decades in optical luminosity. By decoupling luminosity from evolutionary effects, we investigate how the star formation rate (SFR) depends on AGN luminosity, radio-loudness and orientation. We find that: 1) the SFR shows a weak correlation with the bolometric luminosity for all AGN sub-samples, 2) the RLQs show a SFR excess of about a factor of 1.4 compared to the RQQs, matched in terms of black hole mass and bolometric luminosity, suggesting that either positive radio-jet feedback or radio AGN triggering are linked to star-formation triggering and 3) RGs have lower SFRs by a factor of 2.5 than the RLQ sub-sample with the same BH mass and bolometric luminosity. We suggest that there is some jet power threshold at which radio-jet feedback switches from enhancing star formation (by compressing gas) to suppressing it (by ejecting gas). This threshold depends on both galaxy mass and jet power.

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Star formation in high-redshift quasars: excess [O ii] emission in the radio-loud population

Cited by 48 publications

References 116 publications

Feedback by AGN Jets and Wide-angle Winds on a Galactic Scale

Feedback by AGN Jets and Wide-angle Winds on a Galactic Scale

Herschel-ATLAS: the connection between star formation and AGN activity in radio-loud and radio-quiet active galaxies

Observational evidence that positive and negative AGN feedback depends on galaxy mass and jet power

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