Results 131 to 140 of about 14,841,931 (226)

Diversity and evolution of dust-attenuation curves from redshift z  ∼  1 to 9

Astronomy & Astrophysics
The UV–optical dust-attenuation curve is key to interpreting the intrinsic properties of galaxies and provides insights into the nature of dust grains and their geometry relative to stars.
Shivaei Irene, Naidu Rohan P., Rodríguez Montero Francisco, Matsumoto Kosei, Leja Joel, Matthee Jorryt, Johnson Benjamin D., Oesch Pascal A., Chevallard Jacopo, Adamo Angela, Bodansky Sarah, Bunker Andrew J., Covelo Paz Alba, Di Cesare Claudia, Egami Eiichi, Furtak Lukas J., Heintz Kasper E., Kramarenko Ivan, Meyer Romain A., Reddy Naveen A., Rinaldi Pierluigi, Tacchella Sandro, Torralba Alberto, Witstok Joris, Wozniak Michael A., Xiao Mengyuan   +25 more
doaj   +1 more source

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

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

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

The Search for Very High Energy γ-rays from Misaligned AGN [PDF]

, 2013
The aim of this work is to study the potential for emission at very high energies (100 GeV) by misaligned active galactic nuclei (AGN) and the future prospects for observations of these objects with the next generation imaging atmospheric Cherenkov ...
CHEESEBROUGH, ALISTAIR
core  

Recherche et étude des premières galaxies [PDF]

, 2012
L'évolution des galaxies est relativement bien contrainte jusqu'au premier milliard d'années de l'Univers. Au delà de cette limite et compte-tenu du faible nombre de sources confirmées à z>6.0, il est difficile de déterminer le rôle joué par les ...
Laporte, Nicolas
core  

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

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

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

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