Results 51 to 60 of about 58,921 (147)

WITNESSING THE BIRTH OF A QUASAR [PDF]

The Astronomical Journal, 2010
27 pages, 5 figures. Updated references.
Takamitsu Tanaka, Zoltan Haiman, Kristen Menou   +2 more
openaire   +2 more sources

Compatibility of the large quasar groups with the concordance cosmological model [PDF]

, 2016
We study the compatibility of large quasar groups with the concordance cosmological model. Large quasar groups are very large spatial associations of quasars in the cosmic web, with sizes of 50–250 h−1 Mpc.
Campusano, Luis E., Clowes, Roger G., Graham, Matthew J., Marinello, Gabriel E., Söchting, Ilona K., Williger, Gerard M.   +5 more
core   +2 more sources

Within‐Host Mathematical Modeling of Antibiotic‐phage Treatments on Lysogenic and Nonlysogenic Bacteria Dynamics

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT Bacteriophages, or phages (viruses of bacteria), play significant roles in shaping the diversity of bacterial communities within the human gut. A phage‐infected bacterial cell can either immediately undergo lysis (virulent/lytic infection) or enter a stable state within the host as a prophage (lysogeny) until a trigger event, called prophage ...
Hyacinthe M. Ndongmo Teytsa, Ousmane Seydi, Berge Tsanou, Ramsès Djidjou‐Demasse   +3 more
wiley   +1 more source

Quasars in the COSMOS Field [PDF]

The Astrophysical Journal, 2006
Accepted for publication in ApJ; emulateapj style; 25 pages, 13 figures, 4 ...
Prescott, M. K. M., Impey, C. D., Cool, R. J., Scoville, N. Z.   +3 more
openaire   +5 more sources

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

Characterization and inter‐scanner reproducibility of geometric distortion on a small footprint, high‐performance, head‐specific 0.5 T scanner

Medical Physics, EarlyView.
Abstract Background Magnetic resonance imaging (MRI) offers superior soft tissue contrast and essential imaging capabilities for modern medicine. MRI is increasingly being used in applications that require a high degree of spatial fidelity; however, distortions are a well‐known limitation of the modality. The mid‐field (0.3 T ≤ B0 < 1 T) has advantages
Curtis N. Wiens, Chad T. Harris, Ian R. O. Connell   +2 more
wiley   +1 more source

Microlensing variability in the gravitationally lensed quasar Q2237+0305 = the Einstein Cross, I. Spectrophotometric monitoring with the VLT [PDF]

, 2008
We present the results of the first long-term (2.2 years) spectroscopic monitoring of a gravitationally lensed quasar, namely the Einstein Cross Q2237+0305.
A. Eigenbrod, Abajas, Agol, Agol, Burud, Burud, Burud, Cardelli, Chartas, Colley, Courbin, D. Sluse, Dietrich, E. Agol, Eigenbrod, Eigenbrod, Eigenbrod, F. Courbin, Falco, Filippenko, G. Meylan, Gómez-Álvarez, Gómez-Álvarez, Hjorth, Huchra, Irwin, Jakobsson, Kaspi, Keeton, Kent, Kochanek, Kochanek, Koptelova, Lewis, Lewis, Lewis, Magain, Metcalf, Mineshige, Murray, Nemiroff, Richards, Rix, Schechter, Schneider, Schneider, Sluse, Udalski, van Dokkum, Vestergaard, Vuissoz, Wambsganss, Wambsganss, Wandel, Wayth, Wills, Wisotzki, Wisotzki, Witt, Wozniak, Wozniak, Yee, Yonehara   +62 more
core   +2 more sources

Quantitative susceptibility mapping in magnetically inhomogeneous tissues

Magnetic Resonance in Medicine, EarlyView.
Abstract Purpose Conventional quantitative susceptibility mapping (QSM) methods rely on simplified physical models that assume isotropic and homogeneous tissue properties, leading to artifacts and inaccuracies in biological tissues. This study aims to develop and evaluate DEEPOLE, a deep learning–based method that incorporates macroscopically ...
Thomas Jochmann, Fahad Salman, Michael G. Dwyer, Niels Bergsland, Robert Zivadinov, Jens Haueisen, Ferdinand Schweser   +6 more
wiley   +1 more source

The Evolution in the Faint-End Slope of the Quasar Luminosity Function

, 2005
(Abridged) Based on numerical simulations of galaxy mergers that incorporate black hole (BH) growth, we predict the faint end slope of the quasar luminosity function (QLF) and its evolution with redshift.
Bondi H., Bondi H., Brant Robertson, Cattaneo A., Enoki M., Lars Hernquist, Miyaji T., Page M. J., Philip F. Hopkins, Sedov L. I., Silk J., Taylor G. I., Thomas J. Cox, Tiziana Di Matteo, Volker Springel   +14 more
core   +1 more source

Zehn Jahre Gaia‐Messungen: Die hochgenaue Kartierung des Himmels

Physik in unserer Zeit, EarlyView.
Das astrometrische Weltraumobservatorium Gaia der Europäischen Weltraumorganisation hat die astrometrische Forschung revolutioniert, indem es unter anderem präzise Positionen, Bewegungen und Entfernungen von fast zwei Milliarden Himmelsobjekten gemessen hat. Damit stellt es wertvolle Daten für fast alle Gebiete der Astrophysik bereit. Nach dem Ende der
Stefan Jordan
wiley   +1 more source