Zobrazeno 1 - 10
of 4 229
pro vyhledávání: '"weak [gravitational lensing]"'
Publikováno v:
The Astrophysical Journal Letters, Vol 969, Iss 1, p L3 (2024)
We use a new deprojection formula to infer the gravitational potential around isolated galaxies from weak gravitational lensing. The results imply circular velocity curves that remain flat for hundreds of kiloparsecs, greatly extending the classic re
Externí odkaz:
https://doaj.org/article/e1474cbd08244a7584bf479b06147b6e
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 10 (2023)
The accurate modelling of the point spread function (PSF) is of paramount importance in astronomical observations, as it allows for the correction of distortions and blurring caused by the telescope and atmosphere. PSF modelling is crucial for accura
Externí odkaz:
https://doaj.org/article/479bd0502926477ab57ea9c6f7289b70
Publikováno v:
Physics, Vol 4, Iss 4, Pp 1318-1330 (2022)
Motivated by the recent study about the extended uncertainty principle (EUP) black holes, we present in this study its extension called the generalized extended uncertainty principle (GEUP) black holes. In particular, we investigated the GEUP effects
Externí odkaz:
https://doaj.org/article/f8cc589530c5459b92eaadc06e00c156
Autor:
Wentao Luo, John D. Silverman, Surhud More, Andy Goulding, Hironao Miyatake, Takahiro Nishimichi, Chiaki Hikage, Lalitwadee Kawinwanichakij, Junyao Li, Qinxun Li, Xiangchong Li, Elinor Medezinski, Masamune Oguri, Taira Oogi, Cristobal Sifon
Publikováno v:
The Astrophysical Journal, Vol 977, Iss 1, p 59 (2024)
We assess the dark matter halo masses of luminous active galactic nuclei (AGNs) over the redshift range 0.2–1.2 using galaxy–galaxy lensing based on imaging data from the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP). We measure the weak l
Externí odkaz:
https://doaj.org/article/12aa4b3a963c4e8d8a689dd16a5bd06b
Publikováno v:
The Astrophysical Journal, Vol 977, Iss 1, p 87 (2024)
We present a weak lensing analysis of the galaxy cluster A2390 at z = 0.23 using second moment shape measurements made in 411 short 60 s exposures. The exposures are obtained in three broadband photometric filters ( g , r , and i ) using WIYN-ODI. Sh
Externí odkaz:
https://doaj.org/article/11b92a6360ed4a398507493c9822b1bd
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 2, p 79 (2024)
Abell 514 (A514) at z = 0.071 is an intriguing merging system exhibiting highly elongated (∼1 Mpc) X-ray features and three large-scale (300 ∼ 500 kpc) bent radio jets. To dissect this system with its multiwavelength data, it is critical to robus
Externí odkaz:
https://doaj.org/article/50e4464e945941178616b3ca1c354891
Autor:
Shenming Fu, Ian Dell’Antonio, Zacharias Escalante, Jessica Nelson, Anthony Englert, Søren Helhoski, Rahul Shinde, Julia Brockland, Philip LaDuca, Christelyn Larkin, Lucca Paris, Shane Weiner, William K. Black, Ranga-Ram Chary, Douglas Clowe, M. C. Cooper, Megan Donahue, August Evrard, Mark Lacy, Tod Lauer, Binyang Liu, Jacqueline McCleary, Massimo Meneghetti, Hironao Miyatake, Mireia Montes, Priyamvada Natarajan, Michelle Ntampaka, Elena Pierpaoli, Marc Postman, Jubee Sohn, David Turner, Keiichi Umetsu, Yousuke Utsumi, Gillian Wilson
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 1, p 69 (2024)
The Local Volume Complete Cluster Survey is an ongoing program to observe nearly a hundred low-redshift X-ray-luminous galaxy clusters (redshifts 0.03 < z < 0.12 and X-ray luminosities in the 0.1–2.4 keV band L _X500c > 10 ^44 erg s ^−1 ) with th
Externí odkaz:
https://doaj.org/article/ab0bcfcf303b46979ba5889c435f03fe
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 1, p 7 (2024)
In this article we confront a class of f ( Q ) gravity models with observational data of galaxy–galaxy lensing. Specifically, we consider f ( Q ) gravity models containing a small quadratic correction when compared with general relativity (GR), and
Externí odkaz:
https://doaj.org/article/3b1f8ffe3c87475e8dd5b8b44f17179c
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 2, p 157 (2024)
In the hierarchical evolution framework of cosmology, larger halos grow through matter accretion and halo mergers. To clarify halo evolution, we need to define the halo mass and radius physically. However, the pseudoevolution problem makes the proces
Externí odkaz:
https://doaj.org/article/d8e56d12840e402aaa41c66df836853c
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 2, p 156 (2024)
Modern cosmological research in large-scale structure has witnessed an increasing number of machine-learning applications. Among them, convolutional neural networks (CNNs) have received substantial attention due to their outstanding performance in im
Externí odkaz:
https://doaj.org/article/d46a894749c745088a6fec90c2320c17