Results 91 to 100 of about 2,086 (188)

JWST’s PEARLS: A Clumpy Ring Galaxy at z = 4.0148

The Astrophysical Journal
Ring galaxies are an uncommon class of galaxies whose morphology is closely related to dynamical processes that govern galaxy evolution. Some ring galaxies, known as “collisional ring galaxies,” are thought to form as a consequence of head-on collisions ...
David Vizgan, Ming-Yang Zhuang, Ian Smail, Rogier A. Windhorst, Gibson B. Bowling, Cheng Cheng, Seth H. Cohen, Christopher J. Conselice, Jose M. Diego, Brenda L. Frye, Norman A. Grogin, Rolf A. Jansen, Patrick S. Kamieneski, Anton M. Koekemoer, Rafael Ortiz III, Massimo Ricotti, Bangzheng Sun, Hayley Williams, S. P. Willner, Haojing Yan, Aadya Agrawal, Manuel Solimano, Zachary Stone, Joaquin D. Vieira, Chentao Yang   +24 more
doaj   +1 more source

Discovery of Local Analogs to JWST’s Little Red Dots

The Astrophysical Journal Letters
Recently, the James Webb Space Telescope has revealed a new class of high-redshift (high- z , z  > 4) compact galaxies that are red in the rest-frame optical and blue in the rest-frame UV with V-shaped spectral energy distributions (SEDs), referred to as
Ruqiu Lin, Zhen-Ya Zheng, Chunyan Jiang, Fang-Ting Yuan, Luis C. Ho, Junxian Wang, Linhua Jiang, James E. Rhoads, Sangeeta Malhotra, L. Felipe Barrientos, Isak Wold, Leopoldo Infante, Shuairu Zhu, Xiang Ji, Xiaodan Fu   +14 more
doaj   +1 more source

Photometric Redshift Estimation Using Scaled Ensemble Learning

The Astrophysical Journal
The development of the state-of-the-art telescopic systems capable of performing expansive sky surveys such as the Sloan Digital Sky Survey, Euclid, and the Rubin Observatory’s Legacy Survey of Space and Time (LSST) has significantly advanced efforts to ...
Swagata Biswas, Shubhrangshu Ghosh, Avyarthana Ghosh, Yogesh Wadadekar, Abhishek Roy Choudhury, Arijit Mukherjee, Shailesh Deshpande, Arpan Pal   +7 more
doaj   +1 more source

Metallicity Gradients in Modern Cosmological Simulations. I. Tension between Smooth Stellar Feedback Models and Observations

The Astrophysical Journal
The metallicity of galaxies, and its variation with galactocentric radius, provides key insights into the formation histories of galaxies and the physical processes driving their evolution.
Alex M. Garcia, Paul Torrey, Aniket Bhagwat, Ruby J. Wright, Qian-Hui Chen, Kathryn Grasha, Sophia Ridolfo, Z. S. Hemler, Arnab Sarkar, Priyanka Chakraborty, Erica J. Nelson, Ryan L. Sanders, Tiago Costa, Mark Vogelsberger, Lisa J. Kewley, Sara L. Ellison, Lars Hernquist   +16 more
doaj   +1 more source

CAPERS Observations of Two UV-bright Galaxies at z > 10. More Evidence for Bursting Star Formation in the Early Universe

The Astrophysical Journal Letters
We present the first results from the CANDELS-Area Prism Epoch of Reionization Survey (CAPERS), utilizing PRISM observations with the JWST/NIRSpec microshutter assembly in the PRIMER-UDS field.
Vasily Kokorev, Óscar A. Chávez Ortiz, Anthony J. Taylor, Steven L. Finkelstein, Pablo Arrabal Haro, Mark Dickinson, John Chisholm, Seiji Fujimoto, Julian B. Mu noz, Ryan Endsley, Weida Hu, Lorenzo Napolitano, Stephen M. Wilkins, Hollis B. Akins, Ricardo Amoriín, Caitlin M. Casey, Yingjie Cheng, Nikko J. Cleri, Justin Cole, Fergus Cullen, Emanuele Daddi, Kelcey Davis, Callum T. Donnan, James S. Dunlop, Vital Fernández, Mauro Giavalisco, Norman A. Grogin, Nimish Hathi, Michaela Hirschmann, Jeyhan S. Kartaltepe, Anton M. Koekemoer, Ho-Hin Leung, Ray A. Lucas, Derek McLeod, Casey Papovich, Laura Pentericci, Pablo G. Pérez-González, Rachel S. Somerville, Xin Wang, L. Y. Aaron Yung, Jorge A. Zavala   +40 more
doaj   +1 more source

Violent Starbursts and Quiescence Induced by Far-ultraviolet Radiation Feedback in Metal-poor Galaxies at High Redshift

The Astrophysical Journal
JWST observations of galaxies at z ≳ 8 suggest that they are more luminous and clumpier than predicted by most models, prompting several proposals on the physics of star formation and feedback in the first galaxies. In this paper, we focus on the role of
Kazuyuki Sugimura, Massimo Ricotti, Jongwon Park, Fred Angelo Batan Garcia, Hidenobu Yajima   +4 more
doaj   +1 more source

Emulating redshift mixing due to blending in weak gravitational lensing

Astronomy & Astrophysics
Context. Galaxies whose images overlap in the focal plane of a telescope, commonly referred to as blends, are often located at different redshifts. Blending introduces a challenge to weak-lensing cosmology probes since such blends are subject to shear ...
Zhang Zekang, Gruen Daniel, Tortorelli Luca, Li Shun-Sheng, McCullough Jamie   +4 more
doaj   +1 more source

MAMMOTH-Subaru. III. Lyα Halo Identified by Stacking ∼3300 Lyα Emitters at z = 2.2–2.3

The Astrophysical Journal
In this paper, we present a Ly α halo (LAH) identified by stacking ∼3300 Ly α emitters (LAEs) at z = 2.2–2.3. We carry out imaging observations and data reduction with Subaru/Hyper Suprime-Cam.
Haibin Zhang, Zheng Cai, Yongming Liang, Ke Ma, Nobunari Kashikawa, Mingyu Li, Yunjing Wu, Qiong Li, Sean D. Johnson, Masami Ouchi, Xiaohui Fan   +10 more
doaj   +1 more source

Evolution of High Redshift Galaxies

The Astrophysical Journal, 1981
Luminosity evolution and q/sub 0/ have been studied using infrared photometry of giant ellipitcal galaxies. Lack of evolution in infrared colors has been confirmed and a value of -0.05 +- 10.30 for q/sub 0/ has been derived from the K-magnitude Hubble diagram.
openaire   +1 more source

The Impact of Star Formation and Feedback Recipes on the Stellar Mass and Interstellar Medium of High-Redshift Galaxies

The Open Journal of Astrophysics
We introduce MEGATRON, a new galaxy formation model for cosmological radiation hydrodynamics simulations of high-redshift galaxies. The model accounts for the non-equilibrium chemistry and heating/cooling processes of $\geq 80$ atoms, ions, and molecules,
Harley Katz, Martin P. Rey, Corentin Cadiou, Taysun Kimm, Oscar Agertz   +4 more
doaj   +1 more source