Results 41 to 50 of about 91,098 (240)

Localization accuracy of 6‐second CBCT for lung IGRT with various breathing patterns

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose The 6‐second cone beam computed tomography (CBCT) acquisition of the Ethos HyperSight (Varian Medical Systems, Inc. Palo Alto, CA, USA) on‐board imaging system offers benefits, but could be too fast to accurately capture an average target position in a free‐breathing lung cancer patient. This study aimed to ascertain whether a 6‐second
Jihye Koo, Gage Redler, Vladimir Semenenko, Stephen A. Rosenberg, Emily Keit, Jacqueline M. Andreozzi   +5 more
wiley   +1 more source

Dust-Deficient Palomar-Green Quasars and the Diversity of AGN Intrinsic IR Emission

, 2017
To elucidate the intrinsic broadband infrared (IR) emission properties of active galactic nuclei (AGNs), we analyze the spectral energy distributions (SEDs) of 87 ...
Lyu, Jianwei, Rieke, G. H., Shi, Yong
core   +1 more source

Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample [PDF]

, 2002
We describe the algorithm for selecting quasar candidates for optical spectroscopy in the Sloan Digital Sky Survey. Quasar candidates are selected via their non-stellar colors in "ugriz" broad-band photometry, and by matching unresolved sources to the ...
Adam Boucher, Boyle B. J., Brian Yanny, Chris Stoughton, Constance M. Rockosi, Daniel E. Vanden Berk, David J. Schlegel, Donald G. York, Donald P. Schneider, Gordon T. Richards, Heckman T. M., Heidi Jo Newberg, James E. Gunn, Jon Loveday, Joshua A. Frieman, Koo D. C., Mark SubbaRao, Michael A. Strauss, Patrick B. Hall, Pogson N., Robert H. Lupton, Scott Burles, Stephen Kent, Xiaohui Fan, Željko Ivezić   +24 more
core   +2 more sources

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XXI. Candidate Red Quasars at z ≥ 6 from Near-infrared Photometry

The Astrophysical Journal
We present an analysis of near-infrared photometry of 59 quasars at 5.83  −24 mag) of the sample. This luminosity trend may support the idea that red quasars represent an evolutionary stage preceding unobscured quasars, often invoked in the merger-driven
Ryo Iwamoto, Yoshiki Matsuoka, Masatoshi Imanishi, Kazushi Iwasawa, Takuma Izumi, Nobunari Kashikawa, Toshihiro Kawaguchi, Mahoshi Sawamura, Michael A. Strauss, Ayumi Takahashi, Yoshiki Toba   +10 more
doaj   +1 more source

Mimicking Symmetry‐Breaking Einstein Ring by Optical Lens

Advanced Photonics Research, EarlyView.
This article uses an optical lens to emulate the gravitational lensing effect and observe the Einstein ring (ER) patterns. The symmetry‐breaking ER, i.e., Einstein cross, is observed utilizing a rotation‐symmetry‐breaking hemi‐ellipsoid lens. Deformed Einstein cross patterns induced by noncollinearly alignment of the light source–lens–observer are ...
Jun‐Liang Duan, Wen Xiao, Minyong Guo, Tong Liu, Huanyang Chen, Jin‐Hui Chen   +5 more
wiley   +1 more source

Red Type-1 Quasars after Cosmic Noon and Impact on L UV-related Quasar Statistics

The Astrophysical Journal
Over the past decades, nearly a million quasars have been explored to shed light on the evolution of supermassive black holes and galaxies. The ultraviolet-to-optical spectra of type-1 quasars particularly offer insights into their black hole activities.
Yongjung Kim, Dohyeong Kim, Myungshin Im, Minjin Kim   +3 more
doaj   +1 more source

Listerin Alleviates Alzheimer's Disease through IRE1‐mediated Decay of TLR4 mRNA

Advanced Science, EarlyView.
Alzheimer's disease (AD) progression is influenced by microglia‐mediated neuroinflammation. Here, it is demonstrated that Listerin suppresses neuroinflammatory signaling and cognitive impairment in AD models by triggering IRE1α‐mediated TLR4 mRNA decay. Adenoviral Listerin delivery reduces amyloid‐β pathology, positioning it as a new therapeutic target.
Fei Qin, Runyu Cao, Xuemei Bai, Jiahua Yuan, Wanwei Sun, Yi Zheng, Xiaopeng Qi, Wei Zhao, Bingyu Liu, Chengjiang Gao   +9 more
wiley   +1 more source

Exploratory Chandra Observations of the Three Highest Redshift Quasars Known

, 2002
We report on exploratory Chandra observations of the three highest redshift quasars known (z = 5.82, 5.99, and 6.28), all found in the Sloan Digital Sky Survey.
Bing Chen, Daniel E. Vanden Berk, Donald G. York, Donald P. Schneider, Donald Q. Lamb, G. S. Hennessy, Gordon T. Richards, J. Brinkmann, James E. Gunn, Michael A. Strauss, Neta A. Bahcall, Robert Brunner, Scott F. Anderson, William N. Brandt, Wolfgang Voges, Xiaohui Fan, Zickgraf F. J.   +16 more
core   +1 more source

The FIRST Bright Quasar Survey III. The South Galactic Cap [PDF]

, 2001
We present the results of an extension of the FIRST Bright Quasar Survey (FBQS) to the South Galactic cap, and to a fainter optical magnitude limit. Radio source counterparts with SERC R magnitudes brighter than 18.9 which meet the other FBQS criteria ...
Chris D. Impey, David J. Helf, Deanne D. Proctor, etal., Frederic Courbin, Frederic H. Chaffee, Gordon T. Richards, Mark Lacy, Michael D. Gregg, Michael S. Brotherton, Richard L. White, Robert H. Becker, Sally A. Laurent-muehleisen   +12 more
core   +2 more sources

Redshift‐Agnostic Machine Learning Classification: Unveiling Peak Performance in Galaxy, Star, and Quasar Classification (Using SDSS DR17)

Astronomische Nachrichten, EarlyView.
ABSTRACT Classification of galaxies, stars, and quasars using spectral data is fundamental to astronomy, but often relies heavily on redshift. This study evaluates the performance of 10 machine learning algorithms on SDSS data to classify these objects, with a particular focus on scenarios where redshift information is unavailable.
Debashis Chatterjee, Prithwish Ghosh
wiley   +1 more source