Results 21 to 30 of about 173,290,720 (185)

THE SZ EFFECT IN THE PLANCK ERA: ASTROPHYSICAL AND COSMOLOGICAL IMPACT

Acta Polytechnica, 2013
The Sunyaev–Zel’dovich effect (SZE) is a relevant probe for cosmology and particle astrophysics. The Planck Era marks a definite step forward in the use of this probe for astrophysics and cosmology. Astrophysical applications to galaxy clusters, galaxies,
Sergio Colafrancesco
doaj   +1 more source

Multivariate Approaches to Classification in Extragalactic Astronomy

Frontiers in Astronomy and Space Sciences, 2015
Clustering objects into synthetic groups is a natural activity of any science. Astrophysics is not an exception and is now facing a deluge of data. For galaxies, the one-century old Hubble classification and the Hubble tuning fork are still largely in ...
Didier eFraix-Burnet, Didier eFraix-Burnet, Marc eThuillard, Asis Kumar Chattopadhyay   +3 more
doaj   +1 more source

Linking the Metallicity Enrichment History to the Star Formation History: An SFH-regulated Chemical Evolution Model and Its Implications for the Gas Cycling Process

The Astrophysical Journal, 2023
The metallicity enrichment history (MEH) of a galaxy is determined by its star formation history (SFH) and the gas cycling process. In this paper, we construct a chemical evolution model that is regulated by the SFH of the system.
Jun Yin, Shiyin Shen, Lei Hao
doaj   +1 more source

Extragalactic Astrophysics With Next-Generation CMB Experiments

Frontiers in Astronomy and Space Sciences, 2019
Planck, SPT, and ACT surveys have clearly demonstrated that Cosmic Microwave Background (CMB) experiments, while optimized for cosmological measurements, have made important contributions to the field of extragalactic astrophysics in the last decade ...
Gianfranco De Zotti, Matteo Bonato, Matteo Bonato, Matteo Bonato, Mattia Negrello, Tiziana Trombetti, Carlo Burigana, Carlo Burigana, Carlo Burigana, Diego Herranz, Diego Herranz, Marcos López-Caniego, Zhen-Yi Cai, Laura Bonavera, Joaquin González-Nuevo   +14 more
doaj   +1 more source

Kinematic Modeling of Distant Galaxies

Open Astronomy, 2012
Evolution of galaxies is one of the most actual topics in astrophysics. Among the most important factors determining the evolution are two galactic components which are difficult or even impossible to detect optically: the gaseous disks and the dark ...
Kipper Rain, Tempel Elmo, Tamm Antti
doaj   +1 more source

The Edge-On Galaxies in the DESI Survey (EGIDE): Sample Building and Photometry

Galaxies
We present the EGIDE (Edge-on Galaxies in the DESI survey) project—a catalog of 149,215 edge-on galaxy candidates created using the data of the DESI Legacy Imaging Survey DR10 images.
Alexander A. Marchuk, Sergey S. Savchenko, Dmitry I. Makarov, Vladimir P. Reshetnikov, Ilia V. Chugunov, Matvey D. Kozlov, Aleksandra V. Antipova, Anastasia M. Sypkova, Evgenii V. Rubtsov, Dmitry V. Bizyaev   +9 more
doaj   +1 more source

Leptonic and Hadronic Radiative Processes in Supermassive-Black-Hole Jets

Galaxies, 2020
Supermassive black holes lying in the center of galaxies can launch relativistic jets of plasma along their polar axis. The physics of black-hole jets is a very active research topic in astrophysics, owing to the fact that many questions remain open on ...
Matteo Cerruti
doaj   +1 more source

Rapid Growth of Galactic Supermassive Black Holes through Accreting Giant Molecular Clouds during Major Mergers of Their Host Galaxies

The Astrophysical Journal, 2023
Understanding the formation of the supermassive black holes (SMBHs) present in the centers of galaxies is a crucial topic in modern astrophysics. Observations have detected SMBHs with masses of 10 ^9 M _⊙ in the high-redshift galaxies with z ∼ 7. However,
Chi-Hong Lin, Ke-Jung Chen, Chorng-Yuan Hwang   +2 more
doaj   +1 more source

Templates for Fitting Photometry of Ultra-high-redshift Galaxies

The Astrophysical Journal Letters, 2023
Recent data from the James Webb Space Telescope allow a first glimpse of galaxies at z ≳ 11. The most successful tool for identifying ultra-high-redshift candidates and inferring their properties is photometric template fitting.
Charles L. Steinhardt, Vasily Kokorev, Vadim Rusakov, Ethan Garcia, Albert Sneppen   +4 more
doaj   +1 more source

Principal Component‐Based Classification of Blazar Candidates of Uncertain Type in the 4FGL/LAT

Astronomische Nachrichten, EarlyView.
ABSTRACT We adopted principal component analysis (PCA), linear discriminant analysis (LDA), and support vector machines (SVM), to study classification for a sample of 2708 Fermi blazars: 1142 BL Lac objects (BLLs), 759 flat spectrum radio quasars (FSRQs), and 807 blazar candidates of uncertain type (BCUs).
Wen‐Xin Yang, Guo‐Hai Chen, Jing‐Tian Zhu, Hong‐Guang Wang, Denis Bastieri, Xu‐Hong Ye, Jing‐Chao Liang, De‐Xiang Wu, Jiang‐He Yang, Anton A. Strigachev, Rumen S. Bachev, Jun‐Jie Feng, Yi Liu, Jun‐Hui Fan   +13 more
wiley   +1 more source