A young galaxy cluster in the old Universe

Hashimoto, Tetsuya; Goto, Tomotsugu; Momose, Rieko; Ho, Simon C-C; Makiya, Ryu; Chiang, Chia-Ying; Kim, Seong‐Jin

doi:10.1093/mnras/stz2182

Cited by 6 publications

(4 citation statements)

References 75 publications

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“…This result suggests that blue clusters formed later than red clusters. These results are also consistent with previous work (Hashimoto et al 2019;Aguerri et al 2007).…”

Section: Results From Sdss Dr7 Group Catalogsupporting

confidence: 94%

“…dashed line is the cluster with blue fraction of 0.5. Figure 3 shows that the blue fraction of clusters decreases with increasing halo mass and 1/(t c H 0 ), consistent with other work (Hashimoto et al 2019;Wang et al 2018;Baldry et al 2006). For clusters in high-density regions, we found 4 blue clusters whose blue fraction is larger than 0.5, one of them (red point) is the one found by H19.…”

Section: Results From Sdss Dr7 Group Catalogsupporting

confidence: 90%

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The formation of blue cluster in local Universe

Wen,

Luo,

Kang

2020

Preprint

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It is well known from the Butcher-Oemler effect that galaxies in dense environment are mostly red with little star formation and the fraction of blue galaxies in galaxy groups/clusters also declines rapidly with redshifts. A recent work by Hashimoto et al. reported a local 'blue cluster' with high fraction of blue galaxies (∼ 0.57), higher than the model predictions. They ascribed this blue cluster to the feeding of gas along a filamentary structure around the cluster. In this work we use group catalog from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) and the state-of-art of semi-analytic model (SAM) to investigate the formation of blue clusters in local Universe. In total, we find four blue clusters with halo mass ∼ 10 14 M at 0.02 < z < 0.082, while only the one found by Hashimoto et al. is in a filamentary structure. The SAM predicts that blue clusters have later formation time and most blue satellite galaxies are recently accreted. We conclude that the formation of blue clusters is mainly governed by newly accreted blue satellites, rather than the effect of large-scale environment.

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“…This result suggests that blue clusters formed later than red clusters. These results are also consistent with previous work (Hashimoto et al 2019;Aguerri et al 2007).…”

Section: Results From Sdss Dr7 Group Catalogsupporting

confidence: 94%

Section: Results From Sdss Dr7 Group Catalogsupporting

confidence: 90%

The formation of blue cluster in local Universe

Wen,

Luo,

Kang

2020

Preprint

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“…Very recent a surprising discovery of "A young galaxy cluster in the old Universe" [25] was announced. There was discovered a blue cluster, that is a local galaxy cluster with an unprecedentedly high fraction of blue star-forming galaxies yet hosted by a massive dark matter halo.…”

Section: A Strange Galaxymentioning

confidence: 99%

Massive Primordial Black Holes

Dolgov¹

2019

Preprint

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A review of the astronomical data of several last years on an astonishingly high amount of black holes in the contemporary and early (z ∼ 10) universe is presented. Also the data on the recently observed peculiar stars in the Galaxy are discussed. It is argued that practically all black holes in the universe are primordial (PBH) and suggested that an inverted picture of the galaxy formation is realized: supermassive black holes were formed prior to galaxy formation and subsequently seeded the latter. Possibilities of cosmological dark matter consisting of primordial black holes and of abundant cosmological antimatter are considered. A mechanism of 1993 anticipating all these phenomena and predicting an extended log-normal mass spectrum of PBH is described.

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“…Tempel et al 2017), clusters with unusual galaxy populations (e.g. Hashimoto et al 2019) and objects such as fossils clusters, with peculiarities in the luminosity function (e.g. Cypriano et al 2006;Mendes de Oliveira et al 2006).…”

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confidence: 99%

S-PLUS DR1 galaxy clusters and groups catalogue using PzWav

Werner

Cypriano

Gonzalez

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We present a catalogue of 4499 groups and clusters of galaxies from the first data release of the multi-filter (5 broad, 7 narrow) Southern Photometric Local Universe Survey (S-PLUS). These groups and clusters are distributed over 273 deg2 in the Stripe 82 region. They are found using the PzWav algorithm, which identifies peaks in galaxy density maps that have been smoothed by a cluster scale difference-of-Gaussians kernel to isolate clusters and groups. Using a simulation-based mock catalogue, we estimate the purity and completeness of cluster detections: at S/N > 3.3 we define a catalogue that is 80% pure and complete in the redshift range 0.1 < z < 0.4, for clusters with M200 > 1014 M⊙. We also assessed the accuracy of the catalogue in terms of central positions and redshifts, finding scatter of σR = 12 kpc and σz = 8.8 × 10−3, respectively. Moreover, less than 1% of the sample suffers from fragmentation or overmerging. The S-PLUS cluster catalogue recovers ∼80% of all known X-ray and Sunyaev-Zel’dovich selected clusters in this field. This fraction is very close to the estimated completeness, thus validating the mock data analysis and paving an efficient way to find new groups and clusters of galaxies using data from the ongoing S-PLUS project. When complete, S-PLUS will have surveyed 9300 deg2 of the sky, representing the widest uninterrupted areas with narrow-through-broad multi-band photometry for cluster follow-up studies. We present a catalogue of 4499 groups and clusters of galaxies distributed over 273 deg2 in the Stripe 82 from the first data release of the multi-filter (5 broad, 7 narrow) Southern Photometric Local Universe Survey (S-PLUS) using PzWav. PzWav is an algorithm that detects clustering by finding peaks in galaxy density maps, smoothed by a cluster scale difference-of-Gaussians kernel. Using a simulation-based mock catalogue, we estimate the purity and completeness of cluster detections: at S/N > 3.3 we define a catalogue that is 80% pure and complete in the redshift range 0.1 < z < 0.4, for clusters with M200 > 1014 M⊙. We also assessed PzWav accuracy in terms of central positions and redshifts: σR = 12 kpc and σz = 8.8 × 10−3, respectively. Moreover, less than 1% of the sample suffers from fragmentation or overmerging. The resulting S-PLUS cluster catalogue recovers ∼80% of all X-ray/S-Z clusters based on comparison with a broad variety of pure X-rays/S-Z based cluster catalogues in the same field. This is very close to the estimated completeness, thus validating the mock data analysis and paving an efficient way to find new groups and clusters of galaxies using data from the ongoing S-PLUS project. When complete, S-PLUS will have surveyed 9300 deg2 of the sky, representing the widest uninterrupted areas with narrow-through-broad multi-band photometry for cluster follow-up studies.

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A young galaxy cluster in the old Universe

Cited by 6 publications

References 75 publications

The formation of blue cluster in local Universe

The formation of blue cluster in local Universe

Massive Primordial Black Holes

S-PLUS DR1 galaxy clusters and groups catalogue using PzWav

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