Results 31 to 40 of about 10,764,000 (383)

Galactic Model Parameters and Spatial Density of Cataclysmic Variables in the Gaia Era: New Constraints on Population Models

The Astronomical Journal, 2023
The spatial distribution, Galactic model parameters, and luminosity function of cataclysmic variables (CVs) are established using reestimated trigonometric parallaxes from Gaia DR3.
Remziye Canbay, Selçuk Bilir, Aykut Özdönmez, Tansel Ak   +3 more
doaj   +1 more source

The Faint End of the Centaurus A Satellite Luminosity Function [PDF]

Astrophysical Journal, 2018
The Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS) is constructing a wide-field map of the resolved stellar populations in the extended halos of these two nearby, prominent galaxies.
D. Crnojevi'c, D. Sand, P. Bennet, S. Pasetto, K. Spekkens, N. Caldwell, P. Guhathakurta, B. McLeod, A. Seth, J. Simon, J. Strader, E. T. U. O. Tampa, Tâmpa, Fl, USA., D. PhysicsAstronomy, Texas Tech University, Lubbock, Tx, D. O. Astronomy, S. Observatory, U. Arizona, Tucson, Az, Observatories of the Carnegie Institution for Science, Pasadena, Ca, Department of Materials Science, Royal Military College of Canada, Kingston, Ontario, Canada, H. C. F. Astrophysics, Cambridge, Ma, D. O. AstronomyAstrophysics, University of California at Santa Cruz, D. Physics, Astronomy, U. Utah, Salt lake City, Ut, M. University, E. Lansing., Mi, U. Pacific, Stockton   +46 more
semanticscholar   +1 more source

Application value of contrast‐enhanced ultrasound in preoperative localization of microwave ablation for primary hyperparathyroidism

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Background Ultrasonography (US) and 99mTechnetium‐sestamibi scintigraphy (99mTc‐MIBI) are currently first‐line imaging modalities to localize parathyroid adenomas with sensitivities of 80% and 84%, respectively. Therefore, finding other modalities to further improve the diagnostic accuracy for preoperative localization is critically needed ...
Fangyi Liu, Li Zang, Yunlin Li, Zhiwei Guan, Yang Liu, Xiaoling Yu, Zhiyu Han, Ping Liang   +7 more
wiley   +1 more source

Unpacking Merger Jets: A Bayesian Analysis of GW170817, GW190425 and Electromagnetic Observations of Short Gamma-Ray Bursts

The Astrophysical Journal, 2023
We present a novel fully Bayesian analysis to constrain short gamma-ray burst (sGRB) jet structures associated with cocoon, wide-angle, and simple top-hat jet models, as well as the binary neutron star (BNS) merger rate.
Fergus Hayes, Ik Siong Heng, Gavin Lamb, En-Tzu Lin, John Veitch, Michael J. Williams   +5 more
doaj   +1 more source

The Luminosity Function of Tidal Disruption Events from Fallback-powered Emission: Implications for the Black Hole Mass Function

The Astrophysical Journal Letters, 2023
Tidal disruption events (TDEs), in which a star is destroyed by the gravitational field of a supermassive black hole (SMBH), are being observed at a high rate owing to the advanced state of survey science.
Eric R. Coughlin, Matt Nicholl
doaj   +1 more source

Axions and the luminosity function of white dwarfs: the thin and thick discs, and the halo [PDF]

, 2018
The evolution of white dwarfs is a simple gravothermal process of cooling. Since the shape of their luminosity function is sensitive to the characteristic cooling time, it is possible to use its slope to test the existence of additional sources or sinks ...
J. Isern, E. García–Berro, S. Torres, R. Cojocaru, S. Catalan   +4 more
semanticscholar   +1 more source

A Left and Right Truncated Schechter Luminosity Function for Quasars

Galaxies, 2017
The luminosity function for quasars (QSOs) is usually fitted by a Schechter function. The dependence of the number of quasars on the redshift, both in the low and high luminosity regions, requires the inclusion of a lower and upper boundary in the ...
Lorenzo Zaninetti
doaj   +1 more source

EVOLUTION OF THE Hα LUMINOSITY FUNCTION [PDF]

The Astrophysical Journal, 2009
26 pages, 23 figures, submitted to ApJ; version with high resolution figures available at http://www.cfa.harvard.edu/~ewestra/publications/
Michael J. Kurtz, Margaret J. Geller, Ian P. Dell'Antonio, Eduard Westra, Daniel G. Fabricant   +4 more
openaire   +3 more sources

The Faint End of the z = 5 Quasar Luminosity Function from the CFHTLS [PDF]

, 2017
We present results from a spectroscopic survey of z ∼ 5 quasars in the CFHT Legacy Survey. Using both optical color selection and a likelihood method, we select 97 candidates over an area of 105 deg2 to a limit of iAB < 23.2, and 7 candidates in the ...
I. McGreer, Xiaohui Fan, Linhua Jiang, Z. Cai   +3 more
semanticscholar   +1 more source

The quasar luminosity function at redshift 4 with the Hyper Suprime-Cam Wide Survey [PDF]

, 2017
We present the luminosity function of z=4 quasars based on the Hyper Suprime-Cam Subaru Strategic Program Wide layer imaging data in the g, r, i, z, and y bands covering 339.8 deg^2.
M. Akiyama, W. He, H. Ikeda, M. Niida, T. Nagao, J. Bosch, J. Coupon, M. Enoki, M. Imanishi, N. Kashikawa, T. Kawaguchi, Y. Komiyama, Chien-Hsiu Lee, Y. Matsuoka, S. Miyazaki, A. Nishizawa, M. Oguri, Y. Ono, M. Onoue, M. Ouchi, A. Schulze, J. Silverman, Manobu M. Tanaka, Masayuki Tanaka, Y. Terashima, Y. Toba, Y. Ueda   +26 more
semanticscholar   +1 more source