Spectroscopic confirmation of a galaxy cluster associated with 7C 1756+6520 at<i>z</i>= 1.416

Galametz, A.; Stern, Daniel; Stanford, S. A.; Breuck, C. De; Vernet, J.; Griffith, R. L.; Harrison, Fiona A.

doi:10.1051/0004-6361/201014356

Cited by 27 publications

(37 citation statements)

References 36 publications

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“…These environments are highly likely to be proto-clusters or clusters, several of which have already been confirmed (Venemans et al 2007;Galametz et al 2010;Hatch et al 2011b;Galametz et al 2013). However, Fig.…”

Section: Heating the Intracluster Mediummentioning

confidence: 65%

Why z > 1 radio-loud galaxies are commonly located in protoclusters

Hatch¹,

Wylezalek²,

Kurk³

et al. 2014

Monthly Notices of the Royal Astronomical Society

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104

120

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Distant powerful radio-loud active galactic nuclei (RLAGN) tend to reside in dense environments and are commonly found in proto-clusters at z > 1.3. We examine whether this occurs because RLAGN are hosted by massive galaxies which preferentially reside in rich environments. We compare the environments of powerful RLAGN at 1.3 < z < 3.2 from the CARLA survey to a sample of radio-quiet galaxies matched in mass and redshift. We find the environments of RLAGN are significantly denser than those of radio-quiet galaxies, implying that not more than 50% of massive galaxies in this epoch can host powerful radio-loud jets. This is not an observational selection effect as we find no evidence to suggest it is easier to observe the radio emission when the galaxy resides in a dense environment. We therefore suggest that the dense Mpc-scale environment fosters the formation of a radio-jet from an AGN. We show that the number density of potential RLAGN host galaxies is consistent with every > 10 14 M ⊙ cluster having experienced powerful radio-loud feedback of duration ∼60 Myr during 1.3 < z < 3.2. This feedback could heat the intracluster medium to the extent of 0.5-1 keV per gas particle, which could limit the amount of gas available for further star formation in the proto-cluster galaxies.

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Section: Heating the Intracluster Mediummentioning

confidence: 65%

Why z > 1 radio-loud galaxies are commonly located in protoclusters

Hatch¹,

Wylezalek²,

Kurk³

et al. 2014

Monthly Notices of the Royal Astronomical Society

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104

120

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“…De presented the Spitzer/IRAC follow-up of a sample of 70 radio galaxies and found that at least four have companions within 6 with mid-infrared colours consistent with AGN. The spectroscopic follow-up of one of them, 7C 1756-152 at z = 1.42, showed a companion AGN, offset by 6 from the radio galaxy (Galametz et al 2010b).…”

Section: The Radio Galaxy Companionsmentioning

confidence: 96%

“…Complementary studies have attempted to reveal the massive evolved population in these galaxy structures at z ≥ 2 (e.g., Kajisawa et al 2006;Tanaka et al 2007;Zirm et al 2008;Galametz et al 2009aGalametz et al , 2010b in order to determine the epoch of appearance of the first red sequence galaxies. However, most of these confirmed galaxy structures at z ≥ 2 are still in the act of collapsing i.e.…”

Section: Introductionmentioning

confidence: 99%

A large-scale galaxy structure atz = 2.02 associated with the radio galaxy MRC 0156-252

Galametz

Stern

Pentericci

et al. 2013

A&A

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We present the spectroscopic confirmation of a structure of galaxies surrounding the radio galaxy MRC 0156-252 at z = 2.02. The structure was initially discovered as an overdensity of both near-infrared selected z > 1.6 and mid-infrared selected z > 1.2 galaxy candidates. We used the VLT/FORS2 multi-object spectrograph to target ∼80 high-redshift galaxy candidates, and obtain robust spectroscopic redshifts for more than half the targets. The majority of the confirmed sources are star-forming galaxies at z > 1.5. In addition to the radio galaxy, two of its close-by companions (<6 ) also show AGN signatures. Ten sources, including the radio galaxy, lie within | z − 2.020 | <0.015 (i.e., velocity offsets <1500 km s −1 ) and within projected 2 Mpc comoving of the radio galaxy. Additional evidence suggests not only that the galaxy structure associated with MRC 0156-252 is a forming galaxy cluster but also that this structure is most probably embedded in a larger-scale structure.

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“…Indeed the sensitivity required to detect L å galaxies at z∼0.7 with mid-infrared observations, which Spitzer reaches in <2 minute integrations, is sufficient to detect such galaxies to z2. Several large projects are exploiting mid-infrared data to search for high-redshift galaxy clusters using Spitzer and WISE (e.g., Eisenhardt et al 2008;Galametz et al 2010Galametz et al , 2013Papovich et al 2010;Stanford et al 2012Stanford et al , 2014Muzzin et al 2013;Rettura et al 2014;Wylezalek et al 2014;Brodwin et al 2015Brodwin et al , 2016PaternoMahler et al 2017). Such work has, for example, proved useful for (i) measuring the galaxy cluster autocorrelation function out to z∼1.5, which provides a measure of the typical galaxy cluster mass (Brodwin et al 2007); (ii) targeted cosmological surveys for z>1 SNe Ia in dust-free environments (Suzuki et al 2012); (iii) probing evolution in the σ-T x correlation (Brodwin et al 2011); (iv) using the rest-frame near-infrared luminosity function and rest-frame optical colors to probe the formation epoch of cluster galaxies (Mancone et al 2010Snyder et al 2012;Wylezalek et al 2014;Cooke et al 2015; Nantais et al 2016); (v) probing the role of AGN feedback in forming clusters (Galametz et al 2009;Martini et al 2013); (vi) leading cosmological investigations based on the incidence of massive, high-redshift clusters Gonzalez et al 2012);and (vii) probing the dependency of galaxy quenching on environment (Muzzin et al 2014, Nantais et al 2017.…”

Section: Introductionmentioning

confidence: 99%

HST Grism Confirmation of 16 Structures at 1.4 < z < 2.8 from the Clusters Around Radio-Loud AGN (CARLA) Survey

Noirot

Stern

Mei

et al. 2018

ApJ

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109

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We report spectroscopic results from our 40-orbit Hubble Space Telescope slitless grism spectroscopy program observing the 20 densest Clusters Around Radio-Loud AGN (CARLA) candidate galaxy clusters at 1.4<z<2.8. These candidate rich structures, among the richest and most distant known, were identified on the basis of [3.6]-[4.5] color from a 408hr multi-cycle Spitzer program targeting 420 distant radio-loud AGN. We report the spectroscopic confirmation of 16 distant structures at 1.4<z<2.8 associated with the targeted powerful highredshift radio-loud AGN. We also report the serendipitous discovery and spectroscopic confirmation of seven additional structures at 0.87<z<2.12 not associated with the targeted radio-loud AGN. We find that 10 10 -10 11 M e member galaxies of our confirmed CARLA structures form significantly fewer stars than their field counterparts at all redshifts within 1.4z2. We also observe higher star-forming activity in the structure cores up to z=2, finding similar trends as cluster surveys at slightly lower redshifts (1.0 < z < 1.5). By design, our efficient strategy of obtaining just two grism orbits per field only obtains spectroscopic confirmation of emission line galaxies. Deeper spectroscopy will be required to study the population of evolved, massive galaxies in these (forming) clusters. Lacking multi-band coverage of the fields, we adopt a very conservative approach of calling all confirmations "structures," although we note that a number of features are consistent with some of them being bona fide galaxy clusters. Together this survey represents a unique and large homogenous sample of spectroscopically confirmed structures at high redshifts, potentially more than doubling the census of confirmed, massive clusters at z>1.4.

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Spectroscopic confirmation of a galaxy cluster associated with 7C 1756+6520 atz= 1.416

Cited by 27 publications

References 36 publications

Why z > 1 radio-loud galaxies are commonly located in protoclusters

Why z > 1 radio-loud galaxies are commonly located in protoclusters

A large-scale galaxy structure atz = 2.02 associated with the radio galaxy MRC 0156-252

HST Grism Confirmation of 16 Structures at 1.4 < z < 2.8 from the Clusters Around Radio-Loud AGN (CARLA) Survey

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