DISCOVERY OF A GALAXY CLUSTER WITH A VIOLENTLY STARBURSTING CORE AT z = 2.506

Wang, Tao; Elbaz, D.; Daddi, E.; Finoguenov, A.; Liu, Daizhong; Schreiber, C.; Martín, S.; Strazzullo, V.; Valentino, F.; Burg, R. F. J. van der; Zanella, Anita; Ciesla, L.; Gobat, R.; Brun, Amandine M. C. Le; Pannella, M.; Sargent, M.; Shu, Xinwen; Tan, Qinghua; Cappelluti, N.; Li, Yanxia

doi:10.3847/0004-637x/828/1/56

Cited by 206 publications

(327 citation statements)

References 126 publications

Supporting

Mentioning

308

Contrasting

Order By: Relevance

“…Saintonge et al 2012Saintonge et al , 2016Leroy et al 2013;Daddi et al 2010b;Sargent et al 2014;Genzel et al 2015;Tacconi et al 2013Tacconi et al , 2017. We find that all of our cluster galaxies have relatively short depletion timescales, <400 Myrs, with 50% of them having short timescales <300 Myrs, in agreement with other recent cluster studies (Wang et al 2016;Hayashi et al 2017;Stach et al 2017). Galaxies A1 and A2 have depletion timescales consistent with the short timescales observed in highly starbursting galaxies, ∼100 Myrs.…”

Section: Depletion Timescales and Gas Fractionssupporting

confidence: 93%

“…9. It can be seen that this cluster is not particularly prominent at 3 GHz, unlike the high-z cluster presented in Wang et al (2016). It is therefore not a strong over-density of radio sources, which are expected to become more common at z>2 (Daddi et al 2017).…”

Section: Dust Massesmentioning

confidence: 74%

“…Lee et al (2017) recently measured the gas fractions and environmental trends in a proto-cluster at z=2.49, finding the molecular gas masses and fractions to be on average the same as in similar field galaxies, and that the gas fraction increases with decreasing galaxy number density per unit area. Wang et al (2016) also study the environmental effects at high redshift, in the most distant X-ray detected cluster to date at z∼2.5. This cluster is dominated by gas-rich, highly star-forming galaxies with very few quiescent galaxies yet evolved in the core.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Depletion Timescales and Gas Fractionssupporting

confidence: 93%

Section: Dust Massesmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…The passive fraction of protoclusters at z > 2 is difficult to measure, but there is some evidence that suggests that the suppression of star formation within protoclusters decreases at z > 2 (Cooke et al 2014;Husband et al 2016;Wang et al 2016).…”

Section: The Evolution Of Environmental Effects In Protoclustersmentioning

confidence: 99%

The impact of protocluster environments atz= 1.6

Hatch

Cooke

Muldrew

et al. 2016

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

We investigate the effects of dense environments on galaxy evolution by examining how the properties of galaxies in the z = 1.6 protocluster Cl 0218.3−0510 depend on their location. We determine galaxy properties using spectral energy distribution fitting to 14-band photometry, including data at three wavelengths that tightly bracket the Balmer and 4000Å breaks of the protocluster galaxies. We find that two-thirds of the protocluster galaxies, which lie between several compact groups, are indistinguishable from field galaxies. The other third, which reside within the groups, differ significantly from the intergroup galaxies in both colour and specific star formation rate. We find that the fraction of red galaxies within the massive protocluster groups is twice that of the intergroup region. These excess red galaxies are due to enhanced fractions of both passive galaxies (1.7 times that of the intergroup region) and dusty star-forming galaxies (3 times that of the intergroup region). We infer that some protocluster galaxies are processed in the groups before the cluster collapses. These processes act to suppress star formation and change the mode of star formation from unobscured to obscured.

show abstract

“…Since longer-redshift baselines provide greater cosmological leverages, there have been relentless efforts to find and study clusters at higher and higher redshift (e.g., Stanford et al 2012;Stalder et al 2013;Muzzin et al 2013;Tozzi et al 2015;Wang et al 2016).…”

Section: Introductionmentioning

confidence: 99%

First Weak-lensing Results from “See Change”: Quantifying Dark Matter in the Two z ≳ 1.5 High-redshift Galaxy Clusters SPT-CL J2040–4451 and IDCS J1426+3508

Jee

Perlmutter

et al. 2017

ApJ

View full text Add to dashboard Cite

We present a weak-lensing study of SPT-CL J2040-4451 and IDCS J1426+3508 at z = 1.48 and 1.75, respectively. The two clusters were observed in our "See Change" program, a Hubble Space Telescope (HST) survey of 12 massive high-redshift clusters aimed at high-z supernova measurements and weak-lensing estimation of accurate cluster masses. We detect weak but significant galaxy shape distortions using infrared images from the Wide Field Camera 3 (WFC3), which has not yet been used for weak-lensing studies. Both clusters appear to possess relaxed morphology in projected mass distribution, and their mass centroids agree nicely with those defined by both the galaxy luminosity and X-ray emission. Using a Navarro-Frenk-White profile, for which we assume that the mass is tightly correlated with the concentration parameter, we determine the masses of SPT-CL J2040-4451 and IDCS J1426+3508 to be M 200 = 8.6+1.7 −1.4 × 10 14 M and 2.2 +1.1 −0.7 × 10 14 M , respectively. The weak-lensing mass of SPT-CL J2040-4451 shows that the cluster is clearly a rare object. Adopting the central value, the expected abundance of such a massive cluster at z 1.48 is only ∼0.07 in the parent 2500 sq. deg. survey. However, it is yet premature to claim that the presence of this cluster creates a serious tension with the current ΛCDM paradigm unless that tension will remain in future studies after marginalizing over many sources of uncertainties such as the accuracy of the mass function and the mass-concentration relation at the high mass end. The mass of IDCS J1426+3508 is in excellent agreement with our previous Advanced Camera for Surveys-based weak-lensing result while the much higher source density from our WFC3 imaging data makes the current statistical uncertainty ∼40% smaller.

show abstract

DISCOVERY OF A GALAXY CLUSTER WITH A VIOLENTLY STARBURSTING CORE AT z = 2.506

Cited by 206 publications

References 126 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

The impact of protocluster environments atz= 1.6

First Weak-lensing Results from “See Change”: Quantifying Dark Matter in the Two z ≳ 1.5 High-redshift Galaxy Clusters SPT-CL J2040–4451 and IDCS J1426+3508

Contact Info

Product

Resources

About