Passive galaxies as tracers of cluster environments at<i>z</i>~ 2

Strazzullo, V.; Daddi, E.; Gobat, R.; Garilli, B.; Mignoli, M.; Valentino, F.; Onodera, Makoto; Renzini, A.; Cimatti, A.; Finoguenov, A.; Arimoto, N.; Cappellari, Michele; Carollo, C. M.; Feruglio, C.; Floc’h, E. Le; Lilly, S. J.; Maccagni, D.; McCracken, H. J.; Moresco, M.; Pozzetti, L.; Zamorani, G.

doi:10.1051/0004-6361/201425038

Cited by 30 publications

(33 citation statements)

References 78 publications

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“…Studies of the morphologies of cluster galaxies have shown that significant numbers of cluster galaxies at z>1.5 have disturbed or irregular morphologies (Mei et al 2015;Santos et al 2015), and mergers have also been taken to explain the larger sizes of high-redshift cluster galaxies compared to otherwise similar galaxies in the field (e.g. Delaye et al 2014;Strazzullo et al 2015). A recent study by Alberts et al (2016) focussed on galaxy clusters in the range 1<z<2, and concluded that environmental interactions and an increased galaxy merger rate were triggering the heightened AGN fraction in the cores of some 11 massive clusters.…”

Section: Discussionmentioning

confidence: 99%

Merger driven star-formation activity in Cl J1449+0856 at z=1.99 as seen by ALMA and JVLA

Coogan

Daddi

Sargent

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We use ALMA and JVLA observations of the galaxy cluster Cl J1449+0856 at z=1.99, in order to study how dust-obscured star-formation, ISM content and AGN activity are linked to environment and galaxy interactions during the crucial phase of high-z cluster assembly. We present detections of multiple transitions of 12 CO, as well as dust continuum emission detections from 11 galaxies in the core of Cl J1449+0856. We measure the gas excitation properties, star-formation rates, gas consumption timescales and gas-to-stellar mass ratios for the galaxies.We find evidence for a large fraction of galaxies with highly-excited molecular gas, contributing >50% to the total SFR in the cluster core. We compare these results with expectations for field galaxies, and conclude that environmental influences have strongly enhanced the fraction of excited galaxies in this cluster. We find a dearth of molecular gas in the galaxies' gas reservoirs, implying a high star-formation efficiency (SFE) in the cluster core, and find short gas depletion timescales τ<0.1-0.4 Gyrs for all galaxies. Interestingly, we do not see evidence for increased specific star-formation rates (sSFRs) in the cluster galaxies, despite their high SFEs and gas excitations. We find evidence for a large number of mergers in the cluster core, contributing a large fraction of the core's total star-formation compared with expectations in the field. We conclude that the environmental impact on the galaxy excitations is linked to the high rate of galaxy mergers, interactions and active galactic nuclei in the cluster core.

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Section: Discussionmentioning

confidence: 99%

Merger driven star-formation activity in Cl J1449+0856 at z=1.99 as seen by ALMA and JVLA

Coogan

Daddi

Sargent

et al. 2018

Monthly Notices of the Royal Astronomical Society

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“…A significant fraction of cluster SFGs and ETGs have been observed to have disturbed morphologies in z > 1.5 clusters (Mei et al 2015;Santos et al 2015). Minor and/or dry mergers may additionally explain the larger size of quiescent galaxies in clusters at high redshift relative to the field Bassett et al 2013;Delaye et al 2014;Strazzullo et al 2015).…”

Section: Sf and The Cluster Environmentmentioning

confidence: 99%

STAR FORMATION AND AGN ACTIVITY IN GALAXY CLUSTERS FROM z = 1–2: A MULTI-WAVELENGTH ANALYSIS FEATURING HERSCHEL/PACS

Alberts

Pope

Brodwin

et al. 2016

ApJ

117

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We present a detailed, multi-wavelength study of star formation (SF) and active galactic nucleus (AGN) activity in 11 near-infrared (IR) selected, spectroscopically confirmed massive (10 14 M e ) galaxy clusters at 1 < z < 1.75. Using new deep Herschel/PACS imaging, we characterize the optical to far-IR spectral energy distributions (SEDs) for IR-luminous cluster galaxies, finding that they can, on average, be well described by field galaxy templates. Identification and decomposition of AGNs through SED fittings allows us to include the contribution to cluster SF from AGN host galaxies. We quantify the star-forming fraction, dust-obscured SF rates (SFRs) and specific SFRs for cluster galaxies as a function of cluster-centric radius and redshift. In good agreement with previous studies, we find that SF in cluster galaxies at z  1.4 is largely consistent with field galaxies at similar epochs, indicating an era before significant quenching in the cluster cores (r < 0.5 Mpc). This is followed by a transition to lower SF activity as environmental quenching dominates by z ∼ 1. Enhanced SFRs are found in lower mass (   < < M M 10.1 log 10.8) cluster galaxies. We find significant variation in SF from cluster to cluster within our uniformly selected sample, indicating that caution should be taken when evaluating individual clusters. We examine AGNs in clusters from z = 0.5-2, finding an excess AGN fraction at z  1, suggesting environmental triggering of AGNs during this epoch. We argue that our results-a transition from field-like to quenched SF, enhanced SF in lower mass galaxies in the cluster cores, and excess AGNs-are consistent with a co-evolution between SF and AGNs in clusters and an increased merger rate in massive halos at high redshift.

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“…This decreases to´-2.0 10 4 considering only Ksfaint radio sources, and to 10 −5 and 10 −7 for sources with > z 1.5 phot and < < z 2 3 phot , respectively. A more objective approach is to use S 5 peak statistics 12 to search for overdensities in the full COSMOS field, following the method from Strazzullo et al (2015), which allows for a derivation of the dispersion and thus for an evaluation of their significance. Figure 3 shows the resulting S 5 maps and distribution of S 5 readings over the full COSMOS areas for the various selections described in Table 2.…”

Section: Radio Selection Of the Z=25 W16 Clustermentioning

confidence: 99%

“…More typical  z 2 systems have been discovered looking for concentrations of massive galaxies (e.g., Gobat et al 2011Gobat et al , 2013Yuan et al 2014;Strazzullo et al 2015;Wang et al 2016), and X-ray emission searched for at their known positions, a posteriori.…”

Section: Introductionmentioning

confidence: 99%

Radio Selection of the Most Distant Galaxy Clusters

Daddi

Jin

Strazzullo

et al. 2017

ApJL

Self Cite

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We show that the most distant X-ray-detected cluster known to date, ClJ1001 at = z 2.506 spec , hosts a strong overdensity of radio sources. Six of them are individually detected (within  10 ) in deep  0. 75 resolution VLA 3 GHz imaging, with m > S 8 Jy 3 GHz. Of the six, an active galactic nucleus (AGN) likely affects the radio emission in two galaxies, while star formation is the dominant source powering the remaining four. We searched for cluster candidates over the full COSMOS 2 deg 2 field using radio-detected 3 GHz sources and looking for peaks in S 5 density maps. ClJ1001 is the strongest overdensity by far with s >10 , with a simple > z 1.5 phot preselection. A cruder photometric rejection of < z 1 radio foregrounds leaves ClJ1001 as the second strongest overdensity, while even using all radio sources ClJ1001 remains among the four strongest projected overdensities. We conclude that there are great prospects for future deep and wide-area radio surveys to discover large samples of the first generation of forming galaxy clusters. In these remarkable structures, widespread star formation and AGN activity of massive galaxy cluster members, residing within the inner cluster core, will ultimately lead to radio continuum as one of the most effective means for their identification, with detection rates expected in the ballpark of 0.1-1 per square degree at  z 2.5. Samples of hundreds such high-redshift clusters could potentially constrain cosmological parameters and test cluster and galaxy formation models.

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Passive galaxies as tracers of cluster environments atz~ 2

Cited by 30 publications

References 78 publications

Merger driven star-formation activity in Cl J1449+0856 at z=1.99 as seen by ALMA and JVLA

Merger driven star-formation activity in Cl J1449+0856 at z=1.99 as seen by ALMA and JVLA

STAR FORMATION AND AGN ACTIVITY IN GALAXY CLUSTERS FROM z = 1–2: A MULTI-WAVELENGTH ANALYSIS FEATURING HERSCHEL/PACS

Radio Selection of the Most Distant Galaxy Clusters

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