Results 81 to 90 of about 572 (187)

Accelerated Structure Formation: The Early Emergence of Massive Galaxies and Clusters of Galaxies

The Astrophysical Journal
Galaxies in the early Universe appear to have grown too big too fast, assembling into massive, monolithic objects more rapidly than anticipated in the hierarchical Lambda cold dark matter (ΛCDM) structure formation paradigm.
Stacy S. McGaugh, James M. Schombert, Federico Lelli, Jay Franck   +3 more
doaj   +1 more source

Identification of High-redshift Galaxy Overdensities in GOODS-N and GOODS-S

The Astrophysical Journal
We conduct a systematic search for high-redshift galaxy overdensities at 4.9 < z _spec < 8.9 in both the Great Observatories Origins Deep Survey (GOODS)-N and GOODS-S fields using James Webb Space Telescope/Near-Infrared Camera (JWST/NIRCam) imaging from
Jakob M. Helton, Fengwu Sun, Charity Woodrum, Kevin N. Hainline, Christopher N. A. Willmer, Marcia J. Rieke, George H. Rieke, Stacey Alberts, Daniel J. Eisenstein, Sandro Tacchella, Brant Robertson, Benjamin D. Johnson, William M. Baker, Rachana Bhatawdekar, Andrew J. Bunker, Zuyi Chen, Eiichi Egami, Zhiyuan Ji, Roberto Maiolino, Chris Willott, Joris Witstok   +20 more
doaj   +1 more source

ComPACT: Mass-redshift properties of the galaxy cluster catalogue

Astronomy & Astrophysics
Context. Machine-learning methods are more and more frequently applied to astronomical surveys, offering powerful tools for detecting and studying galaxy clusters. Aims.
Voskresenskaia S., Lyskova N., Zaznobin I., Meshcheryakov A.   +3 more
doaj   +1 more source

The JWST Advanced Deep Extragalactic Survey: Discovery of an Extreme Galaxy Overdensity at z = 5.4 with JWST/NIRCam in GOODS-S

The Astrophysical Journal
We report the discovery of an extreme galaxy overdensity at z = 5.4 in the GOODS-S field using James Webb Space Telescope (JWST)/NIRCam imaging from JADES and JEMS alongside JWST/NIRCam wide-field slitless spectroscopy from FRESCO.
Jakob M. Helton, Fengwu Sun, Charity Woodrum, Kevin N. Hainline, Christopher N. A. Willmer, George H. Rieke, Marcia J. Rieke, Sandro Tacchella, Brant Robertson, Benjamin D. Johnson, Stacey Alberts, Daniel J. Eisenstein, Ryan Hausen, Nina R. Bonaventura, Andrew Bunker, Stephane Charlot, Mirko Curti, Emma Curtis-Lake, Tobias J. Looser, Roberto Maiolino, Chris Willott, Joris Witstok, Kristan Boyett, Zuyi Chen, Eiichi Egami, Ryan Endsley, Raphael E. Hviding, Daniel T. Jaffe, Zhiyuan Ji, Jianwei Lyu, Lester Sandles   +30 more
doaj   +1 more source

A 100 Mpc2 Structure Traced by Hyperluminous Galaxies around a Massive z = 2.85 Protocluster

The Astrophysical Journal
We present wide-field mapping at 850 μ m and 450 μ m of the z = 2.85 protocluster in the HS 1549+19 field using the Submillimetre Common-User Bolometer Array 2. Spectroscopic follow-up of 18 bright sources selected at 850 μ m, using the Northern Extended
George C.P. Wang, Scott C. Chapman, Nikolaus Sulzenauer, Frank Bertoldi, Christopher C. Hayward, Ryley Hill, Satoshi Kikuta, Yuichi Matsuda, Douglas Rennehan, Douglas Scott, Ian Smail, Charles C. Steidel   +11 more
doaj   +1 more source

JWST’s First Glimpse of a z > 2 Forming Cluster Reveals a Top-heavy Stellar Mass Function

The Astrophysical Journal Letters
Clusters and their progenitors (protoclusters) at z ∼ 2 − 4, the peak epoch of star formation, are ideal laboratories to study the formation process of both the clusters themselves and their member galaxies.
Hanwen Sun, Tao Wang, Ke Xu, Emanuele Daddi, Qing Gu, Tadayuki Kodama, Anita Zanella, David Elbaz, Ichi Tanaka, Raphael Gobat, Qi Guo, Jiaxin Han, Shiying Lu, Luwenjia Zhou   +13 more
doaj   +1 more source

Weak Lensing by High‐Redshift Clusters of Galaxies. I. Cluster Mass Reconstruction

The Astrophysical Journal, 2000
43 pages, 15 figures, uses aastex, submitted to ApJ 4 color plates produced here as jpg's, larger versions of the jpgs can be found at http://www.mpa-garching.mpg.de ...
Clowe, D., Luppino, G., Kaiser, N., Gioia, I.   +3 more
openaire   +2 more sources

Towards the first mean pressure profile estimate with the NIKA2 Sunyaev-Zeldovich Large Program [PDF]

EPJ Web of Conferences
High-resolution mapping of the hot gas in galaxy clusters is a key tool for cluster-based cosmological analyses. Taking advantage of the NIKA2 millimeter camera operated at the IRAM 30-m telescope, the NIKA2 SZ Large Program seeks to get a high ...
Hanser C., Adam R., Ade P., Ajeddig H., André P., Artis E., Aussel H., Bartalucci I., Beelen A., Benoît A., Berta S., Bing L., Bourrion O., Calvo M., Catalano A., De Petris M., Désert F.-X., Doyle S., Driessen E.F.C., Ejlali G., Ferragamo A., Gomez A., Goupy J., Katsioli S., Kéruzoré F., Kramer C., Ladjelate B., Lagache G., Leclercq S., Lestrade J.-F., Macías-Pérez J.F., Madden S.C., Maury A., Mauskopf P., Mayet F., Monfardini A., Moyer-Anin A., Muñoz-Echeverría M., Paliwal A., Payerne C., Perotto L., Pisano G., Pointecouteau E., Ponthieu N., Pratt G. W., Revéret V., Rigby A.J., Ritacco A., Romero C., Roussel H., Ruppin F., Schuster K., Sievers A., Tucker C.   +53 more
doaj   +1 more source

The Bigfoot: A Footprint of a Coma Cluster Progenitor at z = 3.98

The Astrophysical Journal Letters
Protoclusters, galaxy clusters’ high-redshift progenitors, hold the key to understanding the formation and evolution of clusters and their member galaxies. However, their cosmological distances and spatial extensions (tens of Mpc) have inhibited complete
Hanwen Sun, Tao Wang, Emanuele Daddi, Qiaoyang Hao, Ke Xu, David Elbaz, Luwenjia Zhou, Houjun Mo, Huiyuan Wang, Longyue Chen, Yangyao Chen, Shuowen Jin, Yipeng Lyu, Nikolaj Sillassen, Kai Wang, Tiancheng Yang   +15 more
doaj   +1 more source

Dynamical Properties and Velocity Dispersion–Mass Relation of z ∼ 1 Galaxy Clusters from the GOGREEN and GCLASS Surveys

The Astrophysical Journal
We investigate a sample of 14 galaxy clusters from the GOGREEN and GCLASS (GG) spectroscopic data sets within the redshift range 0.87 ≤ z ≤ 1.37 and cluster masses M _200 ≳ 2 × 10 ^14 h ^−1 M _⊙ .
Shrouk Abdulshafy, Mohamed H. Abdullah, Gillian Wilson, Michael L. Balogh, Raouf H. Mabrouk   +4 more
doaj   +1 more source