Results 121 to 130 of about 112,522 (249)

A Physical Model for the Origin of Quasar Lifetimes

, 2005
We propose a model of quasar lifetimes in which observational quasar lifetimes and an intrinsic lifetime of rapid accretion are strongly distinguished by the physics of obscuration by surrounding gas and dust.
Bouchet P., Brant Robertson, Lars Hernquist, Paul Martini, Philip F. Hopkins, Silk J., Soltan A., Thomas J. Cox, Tiziana Di Matteo, Volker Springel   +9 more
core   +1 more source

Spatially Resolved Patchy Lyman-$\alpha$ Emission Within the Central Kiloparsec of a Strongly Lensed Quasar Host Galaxy at z = 2.8 [PDF]

, 2017
We report the detection of extended Lyman-$\alpha$ emission from the host galaxy of SDSS~J2222+2745, a strongly lensed quasar at $z = 2.8$. Spectroscopic follow-up clearly reveals extended Lyman-$\alpha$ in emission between two images of the central ...
Acharyya, Ayan, Bayliss, Matthew B., Bian, Fuyan, Bordoloi, Rongmon, Dahle, Hakon, Florian, Michael, Gladders, Michael D., Johnson, Traci, Kewley, Lisa, Paterno-Mahler, Rachel, Rigby, Jane R., Runnoe, Jessie, Sharon, Keren   +12 more
core   +2 more sources

Hypothalamic Astrocytes Exhibit Glycolytic Features Making Them Prone for Glucose Sensing

Glia, Volume 73, Issue 11, Page 2253-2272, November 2025.
Main Points Hypothalamic astrocytes versus cortical astrocytes: are more glycolytic due to high Pkm2, Glut1 and Mct4 expression do not exhibit glutamate‐induced glycolysis detect glucose concentration variations via an AMPK sensor with altered lactate production.
Sarah Geller, Nadège Zanou, Sylviane Lagarrigue, Tamara Zehnder, Cathy Gouelle, Tania Santoro, Cendrine Repond, Paola Bezzi, Francesca Amati, Anne‐Karine Bouzier‐Sore, Ariane Sharif, Luc Pellerin   +11 more
wiley   +1 more source

Measuring the Virial Temperature of Galactic Halos Through Electron Scattering of Quasar Emission Lines

, 1998
Semi-analytic models of galaxy formation postulate the existence of virialized gaseous halos around galaxies at high redshifts. A small fraction of the light emitted by any high-redshift quasar is therefore expected to scatter off the free electrons in ...
Abraham Loeb, Bremer M. N., Cassinelli J. P., Cimatti A., Dirac P. A. M., Dunlop J. S., Fabian A., Haehnelt M. G., Kauffmann G., Rees M. J., Rybicki G. B.   +10 more
core   +2 more sources

Quasar Feedback in the Ultraluminous Infrared Galaxy F11119+3257: Connecting the Accretion Disk Wind with the Large-scale Molecular Outflow [PDF]

, 2017
In Tombesi et al., we reported the first direct evidence for a quasar accretion disk wind driving a massive (>100 M⊙ yr−1) molecular outflow. The target was F11119+3257, an ultraluminous infrared galaxy (ULIRG) with unambiguous type 1 quasar optical ...
S. Veilleux, A. Bolatto, F. Tombesi, F. Tombesi, M. Meléndez, M. Meléndez, E. Sturm, E. González-Alfonso, J. Fischer, D. Rupke   +9 more
semanticscholar   +1 more source

Simultaneous liver T1, T2, and ADC MR fingerprinting using optimized motion‐compensated diffusion preparations: An initial validation on volunteers

Magnetic Resonance in Medicine, Volume 94, Issue 5, Page 2173-2189, November 2025.
Abstract Purpose To develop a novel MR fingerprinting sequence using optimized motion‐compensated diffusion preparations for simultaneous T1, T2, and ADC quantification of liver tissue in a single breath‐held scan. Methods A radial spoiled gradient echo acquisition with magnetization preparation modules for T1, T2, and ADC encoding is proposed.
C. Velasco, C. Castillo‐Passi, N. Chaher, D. C. Karampinos, P. Irarrazaval, A. Phinikaridou, R. M. Botnar, C. Prieto   +7 more
wiley   +1 more source

Redshift Evolution of the X-Ray and Ultraviolet Luminosity Relation of Quasars: Calibrated Results from SNe Ia

The Astrophysical Journal
Quasars could serve as standard candles if the relation between their ultraviolet (UV) and X-ray luminosities can be accurately calibrated. Previously, we developed a model-independent method to calibrate quasar standard candles using the distance ...
Xiaolei Li, Ryan E. Keeley, Arman Shafieloo   +2 more
doaj   +1 more source

Lens Model and Time Delay Predictions for the Sextuply Lensed Quasar SDSS J2222+2745

, 2016
SDSS J2222+2745 is a galaxy cluster at z=0.49, strongly lensing a quasar at z=2.805 into six widely separated images. In recent HST imaging of the field, we identify additional multiply lensed galaxies, and confirm the sixth quasar image that was ...
Bayliss, Matthew B., Dahle, Hakon, Florian, Michael K., Gladders, Michael D., Johnson, Traci L., Paterno-Mahler, Rachel, Rigby, Jane R., Sharon, Keren, Whitaker, Katherine E., Wuyts, Eva   +9 more
core   +1 more source

Perfusion Territory Shifts in Cerebrovascular Diseases Measured by Super‐Selective Arterial Spin Labeling

Journal of Neuroimaging, Volume 35, Issue 6, November/December 2025.
ABSTRACT Background and Purpose Individualized diagnostic approaches are crucial in cerebrovascular diseases, such as internal carotid artery stenosis (ICAS). To evaluate individual collateral blood supply, vessel‐selective imaging has gained high relevance.
Gabriel Hoffmann, Miriam Reichert, Jens Göttler, Michael Helle, Lena Schmitzer, Moritz Hernandez Petzsche, Claus Zimmer, Christine Preibisch, Michael Kallmayer, Kornelia Kreiser, Nico Sollmann, Hans Liebl, Stephan Kaczmarz   +12 more
wiley   +1 more source

Probing ~100 AU Intergalactic MgII Absorbing "Cloudlets" with Quasar Microlensing

, 2006
Intergalactic MgII absorbers are known to have structures down to scales ~ 10^{2.5} pc, and there are now indications that they may be fragmented on scales
Kayser R., Subo Dong
core   +3 more sources