Results 41 to 50 of about 85,255 (272)

Intervista a Mauro Folci

Philosophy Kitchen, 2021
Intervista a Mauro ...
Mauro Folci, Stefano Oliva, Guido Baggio
doaj   +1 more source

COOL-LAMPS. Discovery of COOL J0335−1927, a Gravitationally Lensed Quasar at z = 3.27 with an Image Separation of 23.″3

The Astrophysical Journal Letters, 2023
We report the discovery of COOL J0335−1927, a quasar at z = 3.27 lensed into three images with a maximum separation of 23.″3 by a galaxy cluster at z = 0.4178. To date, this is the highest redshift wide-separation lensed quasar known.
Kate Napier, Michael D. Gladders, Keren Sharon, Håkon Dahle, Aidan P. Cloonan, Guillaume Mahler, Isaiah Escapa, Josh Garza, Andrew Kisare, Natalie Malagon, Simon Mork, Kunwanhui Niu, Riley Rosener, Jamar Sullivan Jr., Marie Tagliavia, Marcos Tamargo-Arizmendi, Raul Teixeira, Kabelo Tsiane, Grace Wagner, Yunchong Zhang, Megan Zhao   +20 more
doaj   +1 more source

Clustering Analyses of 300,000 Photometrically Classified Quasars--I. Luminosity and Redshift Evolution in Quasar Bias

, 2006
Using ~300,000 photometrically classified quasars, by far the largest quasar sample ever used for such analyses, we study the redshift and luminosity evolution of quasar clustering on scales of ~50 kpc/h to ~20 Mpc/h from redshifts of z~0.75 to z~2.28 ...
Adam D. Myers, Baugh C. M., Donald P. Schneider, Efstathiou G., Gordon T. Richards, Jain B., Kormendy J., Lacey C., Maddox S. J., Maddox S. J., Negroponte J., Neta A. Bahcall, Peacock J. A., Peacock J. A., Peacock J. A., Richstone D., Robert C. Nichol, Robert J. Brunner, Silk J., Totsuji H., White S. D. M., Wisotzki L., Wyithe J. S. B.   +22 more
core   +1 more source

The Physical Relation between Disc and Coronal Emission in Quasars

Frontiers in Astronomy and Space Sciences, 2018
We propose a modified version of the observed non-linear relation between the X-ray (2 keV) and the ultraviolet (2,500 Å) emission in quasars (i.e., LX∝LUVγ) which involves the full width at half-maximum, FWHM, of the broad emission line, i.e., LX∝LUVγ ...
Elisabeta Lusso, Guido Risaliti, Guido Risaliti   +2 more
doaj   +1 more source

Constraints on the temperature inhomogeneity in quasar accretion discs from the ultraviolet-optical spectral variability

, 2015
The physical mechanisms of the quasar ultraviolet (UV)-optical variability are not well understood despite the long history of observations. Recently, Dexter & Agol presented a model of quasar UV-optical variability, which assumes large local temperature
Kokubo, Mitsuru
core   +1 more source

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XIII: Time delays and 9-yr optical monitoring of the lensed quasar RX J1131-1231 [PDF]

, 2013
We present the results from nine years of optically monitoring the gravitationally lensed z=0.658 quasar RX J1131-1231. The R-band light curves of the four individual images of the quasar were obtained using deconvolution photometry for a total of 707 ...
A. M. Mosquera, Bar-Kana, Bertin, Blandford, Burud, Burud, C. S. Kochanek, Chang, Chantry, Chartas, Chartas, Courbin, D. Sluse, D. Vörös, Dai, E. Eulaers, Eigenbrod, F. Courbin, Fassnacht, Fohlmeister, Fohlmeister, G. Cataldi, G. Meylan, H. Van Winckel, Hjorth, Jakobsson, Keeton, Kochanek, Kochanek, Kundic, Linder, M. Tewes, MacLeod, Magain, Morgan, Morgan, Morgan, Morgan, Mosquera, Myers, N. Cantale, P. Magain, Pelt, Press, Refsdal, S. Dye, Saha, Schild, Schmidt, Sluse, Sluse, Sluse, Sluse, Suyu, Suyu, Suyu, Tewes, van Dokkum, Vanderriest, Vuissoz, Vuissoz, Wyrzykowski   +61 more
core   +2 more sources

AI-driven remote sensing enhances Mediterranean seagrass monitoring and conservation to combat climate change and anthropogenic impacts

Scientific Reports
Seagrasses are undergoing widespread loss due to anthropogenic pressure and climate change. Since 1960, the Mediterranean seascape lost 13–50% of the areal extent of its dominant and endemic seagrass-Posidonia oceanica, which regulates its ecosystem ...
Masuma Chowdhury, Alejo Martínez-Sansigre, Maruška Mole, Eduardo Alonso-Peleato, Nadiia Basos, Jose Manuel Blanco, Maria Ramirez-Nicolas, Isabel Caballero, Ignacio de la Calle   +8 more
doaj   +1 more source

Exploring Possible Relations Between Optical Variability Time Scales and Broad Emission Line Shapes in AGN

Frontiers in Astronomy and Space Sciences, 2018
Here we investigate the connection of broad emission line shapes and continuum light curve variability time scales of type-1 Active Galactic Nuclei (AGN).
Edi Bon, Predrag Jovanović, Paola Marziani, Nataša Bon, Aleksandar Otašević   +4 more
doaj   +1 more source

Statistics of Galactic-scale Quasar Pairs at Cosmic Noon

The Astrophysical Journal, 2023
The statistics of galactic-scale quasar pairs can elucidate our understanding of the dynamical evolution of supermassive black hole (SMBH) pairs, the duty cycles of quasar activity in mergers, or even the nature of dark matter, but they have been ...
Yue Shen, Hsiang-Chih Hwang, Masamune Oguri, Nianyi Chen, Tiziana Di Matteo, Yueying Ni, Simeon Bird, Nadia Zakamska, Xin Liu, Yu-Ching Chen, Kaitlin M. Kratter   +10 more
doaj   +1 more source

Plasmonic Enhancement of Fluorescence and Protein Dynamics in Living Mammalian Cells

Advanced Materials, EarlyView.
This study demonstrates plasmonic enhancement of the function of fluorescent voltage sensing proteins (genetically encoded voltage indicators, (GEVIs), QuasAr6) in live mammalian cells. Coupling to plasmonic nanoparticles does not just increase fluorescence, but influences the protein photocycle, creating a hybrid sensor with its response speed to ...
Marco Locarno, Qiangrui Dong, Marco Post, Xin Meng, Cristiano Glessi, Nynke Marije Hettema, Nidas Brandsma, Sebbe Blokhuizen, Alejandro Castañeda Garcia, Srividya Ganapathy, Thieme Schmidt, Lars van Roemburg, Bing Xu, Chun‐Ting Cho, Liedewij Laan, Miao‐Ping Chien, Daan Brinks   +16 more
wiley   +1 more source