Protoclusters associated with<i>z</i>&gt; 2 radio galaxies

Venemans, Bram; Röttgering, H. J. A.; Miley, G. K.; Breugel, W. J. M. van; Breuck, C. De; Kurk, J.; Pentericci, L.; Stanford, S. A.; Overzier, Roderik; Croft, Steve; Ford, H. C.

doi:10.1051/0004-6361:20053941

Cited by 389 publications

(559 citation statements)

References 124 publications

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“…Chambers, Miley & van Breugel 1990;Röttgering et al 1995;van Ojik et al 1996van Ojik et al , 1997Venemans et al 2007;Villar-Martin et al 2007). Although these Ly α nebulae appear linked to the radio emission, their properties are similar to the Ly α blobs described above.…”

Section: Introductionmentioning

confidence: 81%

“…Colbert et al 2011;Overzier et al 2013). There appears to be a size dependence of the Ly α nebulae on the size of radio sources (van Ojik et al 1997), as well as a hint of environmental dependence on the size of the Ly α nebulae (Venemans et al 2007). Even for those Ly α blobs not directly associated with radio sources, these are sometimes found to be harbouring AGNs (e.g.…”

Section: Introductionmentioning

confidence: 99%

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The environments of Ly α blobs – I. Wide-field Ly α imaging of TN J1338−1942, a powerful radio galaxy at z ≃ 4.1 associated with a giant Ly α nebula★

Saito

Matsuda

Lacey

et al. 2015

Monthly Notices of the Royal Astronomical Society

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Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

The environments of Ly α blobs – I. Wide-field Ly α imaging of TN J1338−1942, a powerful radio galaxy at z ≃ 4.1 associated with a giant Ly α nebula★

Saito

Matsuda

Lacey

et al. 2015

Monthly Notices of the Royal Astronomical Society

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“…Several protoclusters have been found at z > 2 with overdensities of galaxies extending tens of Mpc across e.g. (Venemans et al 2007;Carilli et al 2011;Casey et al 2015;Capak et al 2011). …”

Section: Ulasj1234+0907: a Significant Overdensity Of Millimetre Brigmentioning

confidence: 99%

The discovery of gas-rich, dusty starbursts in luminous reddened quasars atz∼ 2.5 with ALMA

Banerji

Carilli

Jones

et al. 2016

Mon. Not. R. Astron. Soc.

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We present ALMA observations of cold dust and molecular gas in four high-luminosity, heavily reddened (A V ∼ 2.5 − 6 mag) Type 1 quasars at z ∼ 2.5 with virial M BH ∼ 10 10 M , to test whether dusty, massive quasars represent the evolutionary link between submillimetre bright galaxies (SMGs) and unobscured quasars. All four quasars are detected in both the dust continuum and in the 12 CO(3-2) line. The mean dust mass is 6×10 8 M assuming a typical high redshift quasar spectral energy distribution (T=41K, β=1.95 or T=47K, β=1.6). The implied star formation rates are very high -1000 M yr −1 in all cases. Gas masses estimated from the CO line luminosities cover ∼1-5×10 10 (α CO /0.8)M and the gas depletion timescales are very short -∼ 5 − 20Myr. A range of gas-to-dust ratios is observed in the sample. We resolve the molecular gas in one quasar -ULASJ2315+0143 (z = 2.561) -which shows a strong velocity gradient over ∼20 kpc. The velocity field is consistent with a rotationally supported gas disk but other scenarios, e.g. mergers, cannot be ruled out at the current resolution of these data. In another quasar -ULASJ1234+0907 (z = 2.503) -we detected molecular line emission from two millimetre bright galaxies within 200 kpc of the quasar, suggesting that this quasar resides in a significant over-density. The high detection rate of both cold dust and molecular gas in these sources, suggests that reddened quasars could correspond to an early phase in massive galaxy formation associated with large gas reservoirs and significant star formation.

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“…Especially for RLQs, minor merger events might be more common as they are often associated with high density environments (e.g. Venemans et al 2007;Falder et al 2010;Kuiper et al 2011). Under these assumptions, radio jet feedback might depend on gas availability associated with the environment and cold gas supplies.…”

Section: The Dependence Of Star Formation On Radio Jetsmentioning

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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Protoclusters associated withz> 2 radio galaxies

Cited by 389 publications

References 124 publications

The environments of Ly α blobs – I. Wide-field Ly α imaging of TN J1338−1942, a powerful radio galaxy at z ≃ 4.1 associated with a giant Ly α nebula★

The environments of Ly α blobs – I. Wide-field Ly α imaging of TN J1338−1942, a powerful radio galaxy at z ≃ 4.1 associated with a giant Ly α nebula★

The discovery of gas-rich, dusty starbursts in luminous reddened quasars atz∼ 2.5 with ALMA

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

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