Results 101 to 110 of about 112,522 (249)

EIGER. III. JWST/NIRCam Observations of the Ultraluminous High-redshift Quasar J0100+2802

The Astrophysical Journal, 2023
We present the first rest-frame optical spectrum of a high-redshift quasar observed with JWST/NIRCam in Wide Field Slitless mode. The observed quasar, J0100+2802, is the most luminous quasar known at z > 6. We measure the mass of the central supermassive
Anna-Christina Eilers, Robert A. Simcoe, Minghao Yue, Ruari Mackenzie, Jorryt Matthee, Dominika Ďurovčíková, Daichi Kashino, Rongmon Bordoloi, Simon J. Lilly   +8 more
doaj   +1 more source

Tunable-filter imaging of quasar fields at z~1. I. A cluster around MRC B0450-221 [PDF]

, 2000
Using a combination of multicolour broad- and narrow-band imaging techniques and follow-up spectroscopy, we have detected an overdensity of galaxies in the field of quasar MRC B0450-221, whose properties are consistent with a cluster at the quasar ...
Baker J. C., Bland-Hawthorn J., Bland-Hawthorn J., Bower R. G., Brinkmann W., Eales S. A., Ellis R. S., Fioc M., Hunstead R. W., Joanne C. Baker, Jordi Barr, Joss Bland-Hawthorn, Madau P., Malcolm N. Bremer, Ramana M. Athreya, Richard W. Hunstead, Saracco P., Smail I., Snellen I. A. G., Thimm G. J., Thompson   +20 more
core   +3 more sources

Baryon acoustic oscillations from the complete SDSS-III Ly$\alpha$-quasar cross-correlation function at $z=2.4$ [PDF]

, 2017
We present a measurement of baryon acoustic oscillations (BAO) in the cross-correlation of quasars with the Lyα-forest flux transmission at a mean redshift of z = 2.40.
Hélion Marie du Mas des Bourboux, J. Goff, M. Blomqvist, N. Busca, J. Guy, J. Rich, C. Yéche, J. Bautista, 'Etienne Burtin, K. Dawson, D. Eisenstein, A. Font-Ribera, D. Kirkby, J. Miralda-Escud'e, P. Noterdaeme, I. Pâris, P. Petitjean, I. P'erez-Rafols, M. Pieri, N. Ross, D. Schlegel, D. Schneider, A. Slosar, D. Weinberg, P. Zarrouk   +24 more
semanticscholar   +1 more source

A CSF Background Suppression Scheme in Arterial Spin Labeling MRI

NMR in Biomedicine, Volume 39, Issue 1, January 2026.
Arterial spin labeling MRI suffers from signal instability due to CSF pulsation, which are not fully addressed by conventional tissue‐focused background suppression (BS). We developed a CSF BS scheme and demonstrated its advantages in both single‐ and multi‐delay ASL.
Zhiyi Hu, Wen Shi, Yifan Gou, Zihan Wang, Vivek S. Yedavalli, Doris D. Lin, Hanzhang Lu   +6 more
wiley   +1 more source

A Southern Photometric Quasar Catalog from the Dark Energy Survey Data Release 2

The Astrophysical Journal Supplement Series, 2022
We present a catalog of 1.4 million photometrically selected quasar candidates in the southern hemisphere over the ∼5000 deg ^2 Dark Energy Survey (DES) wide survey area. We combine optical photometry from the DES second data release (DR2) with available
Qian Yang, Yue Shen
doaj   +1 more source

Comment on "Biases in the Quasar Mass-Luminosity Plane" [PDF]

, 2010
Comment on "Biases in the Quasar Mass-Luminosity Plane"Comment: Comment on Biases in the Quasar Mass-Luminosity Plane; 3 ...
Elvis, Martin, Steinhardt, Charles
core  

Machine Learning–Driven Near‐ and Mid‐Infrared Chemometrics for Rapid, Cost‐Effective COVID‐19 Screening in Dried Plasma

Journal of Chemometrics, Volume 39, Issue 12, December 2025.
ABSTRACT The COVID‐19 pandemic has highlighted the urgent need for rapid, accurate, and cost‐effective diagnostic alternatives to conventional methods such as RT‐qPCR and immunoassays. In this study, we explored the potential of vibrational spectroscopy, specifically near‐infrared (NIR) and mid‐infrared (MID) spectroscopy, for detecting SARS‐CoV‐2 ...
Fernanda F. S. Oliveira, Wilson J. Cardoso, Luiz F. P. Ramos, Túlio R. Freitas, Priscilla S. Filgueiras, Rafaella F. Q. Grenfell, Reinaldo F. Teófilo, Adriano de Paula Sabino   +7 more
wiley   +1 more source

Russian VLBI network “Quasar”: Current status and outlook

Geodesy and Geodynamics, 2019
This paper presents the past, present and future status of the Russian VLBI network “Quasar”. This network has been developed for at least 20 years by the Institute of Applied Astronomy of the Russian Academy of Sciences (IAA RAS).
N. Shuygina, D. Ivanov, A. Ipatov, I. Gayazov, D. Marshalov, A. Melnikov, S. Kurdubov, M. Vasilyev, G. Ilin, E. Skurikhina, I. Surkis, V. Mardyshkin, A. Mikhailov, A. Salnikov, A. Vytnov, I. Rakhimov, A. Dyakov, V. Olifirov   +17 more
doaj   +1 more source

Quasar Clustering and the Lifetime of Quasars [PDF]

, 2000
Although the population of luminous quasars rises and falls over a period of 10^9 years, the typical lifetime of individual quasars is uncertain by several orders of magnitude.
Baugh C. M., Boyle B. J., Croom S. M., Efstathiou G., Eke V. R., Haehnelt M. G., Heath D. J., Katz N., Lacey C., Mo H. J., Peacock J. A., Richstone D., Shanks T., Shanks T., Shaver P. A., Webster A., White S. D. M., Zeldovich Ya. B.   +17 more
core   +2 more sources

Localized Energy Absorption through LaB6 Surface Modification of PA12 Enables Enhanced Tensile Performance in Diode Laser PBF‐LB

Chemistry–Methods, Volume 5, Issue 12, November 2025.
LaB6 surface modification of PA12 enables efficient NIR diode laser PBF‐LB processing, with enhanced tensile strength and tailored microstructures achieved at minimal additionaly energy. By reducing the need for high filler content, this approach expands the options and performance levels of advanced industrial‐grade polymer additive manufacturing. The
Nadine Stratmann, Michael Willeke, Simon Leupold, Kateryna Loza, Arne Lüddecke, Arno Kwade, Michael Schmidt, Stephan Barcikowski, Anna Rosa Ziefuss   +8 more
wiley   +1 more source