The environmental dependence of properties of galaxies around the RDCSJ0910+54 cluster at<i>z</i> = 1.1

Tanaka, Masayuki; Finoguenov, A.; Kodama, Tadayuki; Morokuma, Tomoki; Rosati, P.; Stanford, S. A.; Eisenhardt, P.; Holden, B. P.; Mei, S.

doi:10.1051/0004-6361:200810440

Cited by 38 publications

(53 citation statements)

References 55 publications

(89 reference statements)

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“…15. At the same time, the fiducial members of XMMU J0338.7+0030 that are classified as elliptical galaxies populate a red locus in the i − Ks vs. Ks colour−magnitude diagram, which is broadly consistent with the red sequence of RDCS J0910+5422 determined by Tanaka et al (2008), as shown in Fig. 18b.…”

Section: Discussionsupporting

confidence: 78%

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First simultaneous optical/near-infrared imaging of an X-ray selected, high-redshift cluster of galaxies with GROND

Pierini

Šuhada

Fassbender

et al. 2012

A&A

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Context. The XMM-Newton Distant Cluster Project is a serendipitous survey for clusters of galaxies at redshifts z ≥ 0.8 based on deep archival XMM-Newton observations. X-ray sources identified as extended are screened against existing optical all-sky surveys for galaxies, in case of candidate high-z clusters followed up with imaging at 4 m-class telescopes and, ultimately, multi-object spectroscopy at 8 m-class telescopes. Low-significance candidate high-z clusters are followed up with the seven-channel imager GROND (Gamma-Ray Burst Optical and Near-Infrared Detector) that is mounted at a 2 m-class telescope. Its unique capability of simultaneous imaging in the g , r , i , z , J, H, Ks bands enables the use of the photometric redshift technique. Aims. Observing strategy, data reduction and analysis, depth and accuracy of the simultaneous multi-wavelength photometry are discussed with the goal of establishing GROND as a useful instrument to confirm X-ray selected (high-z) clusters. Methods. The test case is XMMU J0338.7+0030, suggested to be at z ∼ 1.45 ± 0.15 (1σ) from the analysis of the z − H vs. H colour−magnitude diagram obtained from the follow-up imaging. Later VLT-FORS2 spectroscopy enabled us to identify four members, which set this cluster at z = 1.097 ± 0.002 (1σ). To reach a better knowledge of its galaxy population, we observed XMMU J0338.7+0030 with GROND for about 6 h. The publicly available photo-z code le Phare was used. Results. The Ks-band number counts of the non-stellar sources out of the 832 detected down to z ∼ 26 AB mag (1σ) in the 3.9×4.3 arcmin 2 region of XMMU J0338.7+0030 imaged at all GROND bands clearly exceed those computed in deep fields/survey areas at ∼20.5-22.5 AB mag. The photo-z's of the three imaged spectroscopic members yield z = 1.12 ± 0.09 (1σ). The spatial distribution and the properties of the GROND sources with a photo-z in the range 1.01-1.23 confirm the correspondence of the X-ray source with a galaxy over-density at a significance of at least 4.3σ. Candidate members that are spectro-photometrically classified as elliptical galaxies define a red locus in the i −z vs. z colour−magnitude diagram that is consistent with the red sequence of the cluster RDCS J0910+5422 at z = 1.106. XMMU J0338.7+0030 hosts also a population of bluer late-type spirals and irregulars. The starbursts among the photometric members populate both loci, consistently with previous results. Conclusions. The analysis of the available data set indicates that XMMU J0338.7+0030 is a low-mass cluster (M 200 ∼ 10 14 M ) at z = 1.1. With the photometric accuracy yielded by the present unoptimized multi-band observations with GROND, we not only confirm the spectroscopic redshift of this cluster but also show that it hosts a galaxy population that can still undergo significant bursts of star-formation activity.

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Section: Discussionsupporting

confidence: 78%

“…halo assembly (e.g., Tanaka et al 2008; see also Braglia et al 2009, for the most massive clusters at z ∼ 0.3). This could be the case of XMMU J0338.7+0030, according to the projected distribution of its candidate member galaxies (Figs.…”

Section: Discussionmentioning

confidence: 99%

First simultaneous optical/near-infrared imaging of an X-ray selected, high-redshift cluster of galaxies with GROND

Pierini

Šuhada

Fassbender

et al. 2012

A&A

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“…One should also consider that for galaxies residing in more extreme density regimes, as those represented by rich cluster cores and not observed in our sample, there could be a residual difference even at redshift ∼1 from the general galaxy population (see, e.g., Tanaka et al 2008). As already suggested in the introduction, however, the physical mechanisms responsible for these differences are presumably not the same as those at play in the group environment.…”

Section: Detection Of the Possible Signature Of Environmental Effectsmentioning

confidence: 69%

The zCOSMOS redshift survey: how group environment alters global downsizing trends

Iovino¹,

Cucciati

Scodeggio

et al. 2009

A&A

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Context. Groups of galaxies are a common environment, bridging the gap between starforming field galaxies and quiescent cluster galaxies. Within groups secular processes could be at play, contributing to the observed strong decrease of star formation with cosmic time in the global galaxy population. Aims. We took advantage of the wealth of information provided by the first ∼10 000 galaxies of the zCOSMOS-bright survey and its group catalogue to study in detail the complex interplay between group environment and galaxy properties. Methods. The classical indicator F blue , i.e., the fraction of blue galaxies, proved to be a simple but powerful diagnostic tool. We studied its variation for different luminosity and mass selected galaxy samples, divided as to define groups/field/isolated galaxy subsamples. Results. Using rest-frame evolving B-band volume-limited samples, the groups galaxy population exhibits significant blueing as redshift increases, but maintains a systematic difference (a lower F blue ) with respect to the global galaxy population, and an even larger difference with respect to the isolated galaxy population. However moving to mass selected samples it becomes apparent that such differences are largely due to the biased view imposed by the B-band luminosity selection, being driven by the population of lower mass, bright blue galaxies for which we miss the redder, equally low mass, counterparts. By carefully focusing the analysis on narrow mass bins such that mass segregation becomes negligible we find that only for the lowest mass bin explored, i.e., log(M * /M ) ≤ 10.6, does a significant residual difference in color remain as a function of environment, while this difference becomes negligible toward higher masses. Conclusions. Our results indicate that red galaxies of mass log(M * /M ) ≥ 10.8 are already in place at z ∼ 1 and do not exhibit any strong environmental dependence, possibly originating from so-called nature or internal mechanisms. In contrast, for lower galaxy masses and redshifts lower than z ∼ 1, we observe the emergence in groups of a population of nurture red galaxies: slightly deviating from the trend of the downsizing scenario followed by the global galaxy population, and more so with cosmic time. These galaxies exhibit signatures of group-related secular physical mechanisms directly influencing galaxy evolution. Our analysis implies that these mechanisms begin to significantly influence galaxy evolution after z ∼ 1, a redshift corresponding to the emergence of structures in which these mechanisms take place.

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“…Current studies aim at establishing whether their abundance evolves with lookback time, with proponents divide into opposite camps (e.g. Andreon 2008;Lidman et al 2008;Crawford et al 2009;Tanaka et al 2008;vs. Gilbank & Balogh 2008;Stott et al 2007).…”

Section: Introductionmentioning

confidence: 99%

JKCS 041: a colour-detected galaxy cluster at $z_{\mathrm{phot}}$ ~ 1.9 with deep potential well as confirmed by X-ray data

Andreon¹,

Maughan

Trinchieri³

et al. 2009

A&A

121

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We report the discovery of JKCS 041, a massive near-infrared selected cluster of galaxies at z phot ∼ 1.9. The cluster was originally discovered using a modified red-sequence method and also detected in follow-up Chandra data as an extended X-ray source. Optical and near-infrared imaging data alone allow us to show that the detection of JKCS 041 is secure, even in the absence of the X-ray data. We investigate the possibility that JKCS 041 is not a galaxy cluster at z ∼ 1.9, and find other explanations unlikely. The X-ray detection and statistical arguments rule out the hypothesis that JKCS 041 is actually a blend of groups along the line of sight, and we find that the X-ray emitting gas is too hot and dense to be a filament projected along the line of sight. The absence of a central radio source and the extent and morphology of the X-ray emission argue against the possibility that the X-ray emission comes from inverse Compton scattering of CMB photons by a radio plasma. The cluster has an X-ray core radius of 36.6 +8.3 −7.6 arcsec (about 300 kpc), an X-ray temperature of 7.4 +5.3 −3.3 keV, a bolometric X-ray luminosity within R 500 of (7.6 ± 0.5) × 10 44 erg s −1 , and an estimated mass of M 500 = 2.9 +3.8 −2.4 × 10 14 M , the last derived under the usual (and strong) assumptions. The cluster is composed of 16.4 ± 6.3 galaxies within 1.5 arcmin (750 kpc) brighter than K ∼ 20.7 mag. The high redshift of JKCS 041 is determined from the detection colour, from the detection of the cluster in a galaxy sample formed by z phot > 1.6 galaxies and from a photometric redshift based on 11-band spectral energy distribution fitting. By means of the latter we find the cluster redshift to be 1.84 < z < 2.12 at 68% confidence. Therefore, JKCS 041 is a cluster of galaxies at z phot ∼ 1.9 with a deep potential well, making it the most distant cluster with extended X-ray emission known.

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The environmental dependence of properties of galaxies around the RDCSJ0910+54 cluster atz = 1.1

Cited by 38 publications

References 55 publications

First simultaneous optical/near-infrared imaging of an X-ray selected, high-redshift cluster of galaxies with GROND

First simultaneous optical/near-infrared imaging of an X-ray selected, high-redshift cluster of galaxies with GROND

The zCOSMOS redshift survey: how group environment alters global downsizing trends

JKCS 041: a colour-detected galaxy cluster at $z_{\mathrm{phot}}$ ~ 1.9 with deep potential well as confirmed by X-ray data

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