Results 21 to 30 of about 10,764,000 (383)

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). V. Quasar Luminosity Function and Contribution to Cosmic Reionization at z = 6 [PDF]

Astrophysical Journal, 2018
We present new measurements of the quasar luminosity function (LF) at z ∼ 6 over an unprecedentedly wide range of the rest-frame ultraviolet luminosity M1450 from −30 to −22 mag.
Y. Matsuoka, M. Strauss, N. Kashikawa, M. Onoue, K. Iwasawa, Ji-Jia Tang, Chien-Hsiu Lee, M. Imanishi, T. Nagao, M. Akiyama, N. Asami, J. Bosch, H. Furusawa, T. Goto, J. Gunn, Y. Harikane, H. Ikeda, T. Izumi, T. Kawaguchi, N. Kato, S. Kikuta, K. Kohno, Y. Komiyama, R. Lupton, T. Minezaki, S. Miyazaki, H. Murayama, M. Niida, A. Nishizawa, Akatoki Noboriguchi, M. Oguri, Y. Ono, M. Ouchi, P. Price, H. Sameshima, A. Schulze, H. Shirakata, J. Silverman, N. Sugiyama, Philip J. Tait, M. Takada, T. Takata, Masayuki Tanaka, Y. Toba, Y. Utsumi, Shiang‐Yu Wang, T. Yamashita   +46 more
semanticscholar   +1 more source

COLDz: Shape of the CO Luminosity Function at High Redshift and the Cold Gas History of the Universe [PDF]

Astrophysical Journal, 2018
We report the first detailed measurement of the shape of the CO luminosity function at high redshift, based on >320 hr of the NSF’s Karl G. Jansky Very Large Array (VLA) observations over an area of ∼60 arcmin2 taken as part of the CO Luminosity Density ...
D. Riechers, R. Pavesi, C. Sharon, J. Hodge, R. Decarli, F. Walter, C. Carilli, M. Aravena, E. D. Cunha, E. Daddi, M. Dickinson, I. Smail, P. Capak, R. Ivison, M. Sargent, N. Scoville, J. W. Cornell, Mpia, McMaster, Yale-NUS College, Leiden, -INAF, Nrao, Cambridge, D. Portales, Anu, C. Saclay, Noao, Durham, IPACCaltech, Eső, Edinburgh, Sussex, Caltech, ska   +34 more
semanticscholar   +1 more source

Luminosity function of clusters of galaxies [PDF]

Astronomy & Astrophysics, 2001
15 pages, 14 figures, 4 tables; uses subfigure.sty; accepted for publication in Astronomy and ...
PAOLILLO, MAURIZIO, S. ANDREON, LONGO, GIUSEPPE, E. PUDDU, R. R. GAL, R. SCARAMELLA, S. G. DJORGOVSKI, R. DE CARVALHO   +7 more
openaire   +7 more sources

Correlation function of the luminosity distances [PDF]

Journal of Cosmology and Astroparticle Physics, 2017
We present the correlation function of the luminosity distances in a flat $ $CDM universe. Decomposing the luminosity distance fluctuation into the velocity, the gravitational potential, and the lensing contributions, we study their individual contributions to the correlation function. The lensing contribution is important at large redshift ($z\gtrsim
Biern, Sang Gyu, Yoo, Jaiyul
openaire   +4 more sources

Joint Power Spectrum and Voxel Intensity Distribution Forecast on the CO Luminosity Function with COMAP [PDF]

Astrophysical Journal, 2018
We develop a framework for joint constraints on the CO luminosity function based on power spectra (PS) and voxel intensity distributions (VID) and apply this to simulations of CO Mapping Array Pathfinder (COMAP), a CO intensity mapping experiment.
H. Ihle, D. Chung, G. Stein, Mar Alvarez, J. Bond, P. Breysse, K. Cleary, H. Eriksen, M. K. Foss, J. Gundersen, S. Harper, N. Murray, H. Padmanabhan, M. Viero, I. Wehus   +14 more
semanticscholar   +1 more source

Semi‐supervised classification of fundus images combined with CNN and GCN

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose Diabetic retinopathy (DR) is one of the most serious complications of diabetes, which is a kind of fundus lesion with specific changes. Early diagnosis of DR can effectively reduce the visual damage caused by DR. Due to the variety and different morphology of DR lesions, automatic classification of fundus images in mass screening can ...
Sixu Duan, Pu Huang, Min Chen, Ting Wang, Xiaolei Sun, Meirong Chen, Xueyuan Dong, Zekun Jiang, Dengwang Li   +8 more
wiley   +1 more source

The Hα Luminosity Function of Galaxies at z ∼ 4.5

The Astrophysical Journal, 2023
We present the H α luminosity function (LF) derived from a large sample of Lyman break galaxies at z ∼ 4.5 over the GOODS-South and North fields.
Victoria Bollo, Valentino González, Mauro Stefanon, Pascal A. Oesch, Rychard J. Bouwens, Renske Smit, Garth D. Illingworth, Ivo Labbé   +7 more
doaj   +1 more source

The Imprint of Cosmic Reionization on the Luminosity Function of Galaxies [PDF]

Astrophysical Journal, 2018
The (re)ionization of hydrogen in the early universe has a profound effect on the formation of the first galaxies: by raising the gas temperature and pressure, it prevents gas from cooling into small halos, thus affecting the abundance of present-day ...
S. Bose, A. Deason, C. Frenk
semanticscholar   +1 more source

COMP Report: CPQR technical quality control guidelines for use of positron emission tomography/computed tomography in radiation treatment planning

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Positron emission tomography with x‐ray computed tomography (PET/CT) is increasingly being utilized for radiation treatment planning (RTP). Accurate delivery of RT therefore depends on quality PET/CT data. This study covers quality control (QC) procedures required for PET/CT for diagnostic imaging and incremental QC required for RTP.
Ran Klein, Mike Oliver, Dan La Russa, John Agapito, Stewart Gaede, JeanPierre Bissonnette, Arman Rahmim, Carlos Uribe   +7 more
wiley   +1 more source

Joint application of hybrid iterative reconstruction and adaptive filters on neck‐and‐shoulder CT imaging: A clinical evaluation

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose To assess whether the joint application of hybrid iterative reconstruction (HIR) and an adaptive filter (AF) could reduce streak artifacts and improve image quality of neck‐and‐shoulder computed tomography (CT). Methods This study included 96 patients with suspicious neck lesions who underwent a routine nonenhanced scan on a 64‐slice ...
Wenfeng Jin, Yifei Ma, Dan Han, Xiaojie Xie, Weiyuan Zhang, Yan Wu, Guozhi Zhang   +6 more
wiley   +1 more source