Results 61 to 70 of about 49,186 (262)

An ASCA Study of the Heavy Element Distribution in Clusters of Galaxies

, 2000
We perform a spatially resolved X-ray spectroscopic study of a set of 11 relaxed clusters of galaxies observed by the ROSAT/PSPC and ASCA/SIS. Using a method which corrects for the energy dependent effects of the ASCA PSF based on ROSAT images, we ...
A. Finoguenov, Arnaud M., Balogh M., Cappellaro E., Dell’Antonio I., Dupke R., Edge A. C., Fukazawa Y., Gibson B. K., Hobbs I. S., Kikuchi K., Kroupa P., L. P. David, Mewe R., Mitchell R., T. J. Ponman, Tamura T., Tanaka Y.   +17 more
core   +1 more source

Bayesian estimation applied to multiple species [PDF]

, 2006
Observed data are often contaminated by undiscovered interlopers, leading to biased parameter estimation. Here we present BEAMS (Bayesian estimation applied to multiple species) which significantly improves on the standard maximum likelihood approach in ...
B. P. Schmidt, Bruce A. Bassett, J. Sollerman, M. Sullivan, Martin Kunz, N. Kaiser, Renée A. Hlozek   +6 more
core   +3 more sources

Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity

Annalen der Physik, Volume 538, Issue 1, January 2026.
This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley   +1 more source

Carnegie Supernova Project-II: Extending the Near-Infrared Hubble Diagram for Type Ia Supernovae to $z\sim0.1$

, 2018
The Carnegie Supernova Project-II (CSP-II) was an NSF-funded, four-year program to obtain optical and near-infrared observations of a "Cosmology" sample of $\sim100$ Type Ia supernovae located in the smooth Hubble flow ($0.03 \lesssim z \lesssim 0.10 ...
Anais, Jorge, Anderson, J. P., Ashall, C., Baltay, C., Baron, E., Burns, Christopher R., Busta, Luis, Campillay, Abdo, Castellón, Sergio, Contreras, Carlos, Corco, Carlos, Diamond, T., Folatelli, Gastón, Freedman, Wendy L., Galbany, L., Gall, Christa, Gonzalez, Consuelo, Goobar, A., Hadjiyska, Ellie, Hamuy, Mario, Hoeflich, P., Holmbo, Simon, Hsiao, E. Y., Kasliwal, Mansi, Krisciunas, Kevin, Lidman, C., Morrell, Nidia, Nugent, Peter E., Perlmutter, S., Persson, S. E., Phillips, M. M., Piro, Anthony L., Rabinowitz, David, Roth, Miguel, Ryder, Stuart D., Schmidt, Brian P., Serón, Jacqueline, Shappee, B. J., Stritzinger, Maximilian, Suntzeff, Nicholas B., Taddia, F., Torres, Simón, Uddin, Syed A., Walker, Emma S.   +43 more
core   +1 more source

A unique model for the variety of multiple populations formation(s) in globular clusters: a temporal sequence [PDF]

, 2016
We explain the multiple populations recently found in the 'prototype' Globular Cluster (GC) NGC 2808 in the framework of the asymptotic giant branch (AGB) scenario.
D'Antona, F., D'Ercole, A., Marino, A. F., Milone, A. P., Tailo, M., Ventura, P., Vesperini, E.   +6 more
core   +2 more sources

Radial Velocity Monitoring and Analysis of Gaia Astrometry of Selected Intermediate Mass Stars to Constrain Their Multiplicity Status

Astronomische Nachrichten, Volume 347, Issue 1, January 2026.
ABSTRACT We present new radial velocity measurements of 13 selected intermediate mass stars (2–6 M⊙). The measurements were performed between 29 April and 6 September 2024 at the University Observatory Jena using the échelle spectrograph FLECHAS. The radial velocity of eight stars was found to be constant during our spectroscopic monitoring, namely: 17
J. Bätz, M. Mugrauer, K.‐U. Michel, J. Reichert, A. Tschirschky, L. Pietsch, F. Edelmann, R. Neuhäuser   +7 more
wiley   +1 more source

Late-time Optical and X-Ray Emission Evolution of the Oxygen-rich SN 1996cr

The Astrophysical Journal
When the ejecta of a supernova (SN) interact with the progenitor star's circumstellar environment, a strong shock is driven back into the ejecta, causing the material to become bright optically and in X-rays.
Daniel Patnaude, Kathryn E. Weil, Robert A. Fesen, Dan Milisavljevic, Ralph P. Kraft   +4 more
doaj   +1 more source

Cherenkov Telescope Array Observatory: Die Zukunft der Gammaastronomie

Physik in unserer Zeit, Volume 57, Issue 1, Page 10-18, January 2026.
Im Jahr 1989 hat das Wipple‐Observatorium die erste Quelle hochenergetischer Gammastrahlung entdeckt. 2002 waren dann sechs Quellen bekannt, 2024 schon mehr als 300. Und das ist immer noch lediglich die Spitze des Eisbergs in der jungen Geschichte der Gammaastronomie.
Daniela Hadasch, Daniel Mazin
wiley   +1 more source

Probing the Shock Breakout Signal of SN 2024ggi from the Transformation of Early Flash Spectroscopy

The Astrophysical Journal Letters
We present early-time, hour-to-day cadence spectroscopy of the nearby Type II supernova (SN II) 2024ggi, which was discovered at a phase when the SN shock had just emerged from the red supergiant (RSG) progenitor star.
Jujia Zhang, Luc Dessart, Xiaofeng Wang, Qian Zhai, Yi Yang, Liping Li, Han Lin, Giorgio Valerin, Yongzhi Cai, Zhen Guo, Lingzhi Wang, Zeyi Zhao, Zhenyu Wang, Shengyu Yan   +13 more
doaj   +1 more source

Carnegie Supernova Project-II: Near-infrared spectral diversity and template of Type Ia Supernovae [PDF]

, 2022
Jing Lü, E. Y. Hsiao, M. M. Phillips, C. R. Burns, C. Ashall, N. Morrell, Lawrence C. Ng, Sahana Kumar, Melissa Shahbandeh, P. Hoêflich, E. Baron, S. A. Uddin, M. Stritzinger, N. B. Suntzeff, C. Baltay, Scott Davis, T. Diamond, G. Folatelli, F. Förster, Jonathan Gagné, L. Galbany, C. Gall, S. González–Gaitán, S. Holmbo, R. Kirshner, K. Krisciunas, G. H. Marion, S. Perlmutter, P. J. Pessi, Anthony L. Piro, D. Rabinowitz, S. D. Ryder, David J. Sand   +32 more
openalex   +1 more source