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We consider a machine learning algorithm to detect and identify strong gravitational lenses on sky images. First, we simulate different artificial but very close to reality images of galaxies, stars and strong lenses, using six different…

天体物理仪器与方法 · 物理学 2021-04-06 H. G. Khachatryan

On the occasion of the International Year of Astronomy (IYA2009), we present a new interactive dictionary of astronomy and astrophysics, which contains about 7000 entries. This interdisciplinary and multicultural work is intended for…

天体物理仪器与方法 · 物理学 2009-11-25 M. Heydari-Malayeri

This paper is the first part of the Catalog of Periodic Variable Stars in the Galactic bulge. The Catalog is based on observations collected during the OGLE microlensing search. 213 periodic variable stars brighter than I=18 mag: 31…

天体物理学 · 物理学 2016-08-30 A. UDALSKI , M. KUBIAK , M. SZYMANSKI , J. KALUZNY , M. MATEO , W. KRZEMINSKI

Having been an editor for Physics Letters B (PLB) for many years I became interested in the history of publishing, especially in particle physics (HEP). Since PLB goes back to 1967 and an index of all PLB publications is available online,…

数字图书馆 · 计算机科学 2020-07-13 Hendrik Weerts

Advanced LIGO and Advanced Virgo could observe the first lensed gravitational waves in the coming years, while the future Einstein Telescope could observe hundreds of lensed events. Ground-based gravitational-wave detectors can resolve…

宇宙学与河外天体物理 · 物理学 2020-11-25 Giulia Pagano , Otto A. Hannuksela , Tjonnie G. F. Li

We report the discovery of a new gravitationally lensed quasar (double) from the Optical Gravitational Lensing Experiment (OGLE) identified inside the $\sim$670 sq. deg area encompassing the Magellanic Clouds. The source was selected as one…

GRB afterglows offer a probe of the intergalactic medium out to high redshift which complements observations along more abundant quasar lines-of-sight. Although both quasars and GRB afterglows should provide a-priori random sight-lines…

宇宙学与河外天体物理 · 物理学 2015-05-18 Stuart Wyithe , S. Peng Oh , Bartosz Pindor

The status of searches for gravitational microlensing events of the stars in our galaxy and in other galaxies of the Local Group, the interpretation of the results, some theory, and prospects for the future are reviewed. The searches have…

天体物理学 · 物理学 2011-05-05 Bohdan Paczynski

We present the VI photometric maps of the Galactic bulge. They contain VI photometry and astrometry of about 30 million stars from 49 fields of 0.225 square degree each in the Galactic center region. The data were collected during the…

The last decade has seen an enormous increase of activity in the field of gravitational lensing, mainly driven by improvements of observational capabilities. I will review the basics of gravitational lens theory, just enough to understand…

天体物理学 · 物理学 2015-06-24 Peter Schneider

A bibliographic database will be constructed with the purpose to be a general tool for searching references for galaxy clusters. The structure of the database will be completely different from the available now databases as NED, SIMBAD,…

天体物理学 · 物理学 2007-05-23 M. Kalinkov , I. Valtchanov , I. Kuneva

With an exponentially growing number of scientific papers published each year, advanced tools for exploring and discovering publications of interest are becoming indispensable. To empower users beyond a simple keyword search provided e.g.…

信息检索 · 计算机科学 2017-06-27 Franziska Horn

A summary is given of the current status and plans for gravitational-wave searches at all plausible wavelengths, from the size of the observable universe to a few kilometers. The anticipated scientific payoff from these searches is…

广义相对论与量子宇宙学 · 物理学 2009-09-25 Kip S. Thorne

The International Lattice Data Grid (ILDG) continues stable operation for about one year and has accumulated a lot of valuable configurations. After a brief review of the ILDG system, we highlight large physics projects, whose…

高能物理 - 格点 · 物理学 2009-02-12 Tomoteru Yoshie

We develop an iterative approach to gravitational lensing theory based on approximate solutions of the null geodesic equations. The approach can be employed in any space-time which is ``close'' to a space-time in which the null geodesic…

广义相对论与量子宇宙学 · 物理学 2009-10-31 Thomas P. Kling , Ezra T. Newman , Alejandro Perez

Gravitational lensing occurs as the path of light from distant celestial bodies is distorted due to gravitational attraction by other celestial bodies, whose mass is partly invisible, being so-called dark matter. When observed through a…

天体物理仪器与方法 · 物理学 2024-05-29 Hans Georg Schaathun , Ben David Normann , Kenny Solevåg-Hoti

Ratnatunga et al. (1995) have recently proposed that an object, HST 14176+5226, in the "Groth-Westphal" HST survey strip is an "Einstein cross" gravitational lens. By chance, this object has been previously observed in the Canada-France…

天体物理学 · 物理学 2007-05-23 David Crampton , O. Le Fevre , F. Hammer , S. J. Lilly

This paper describes the database of optical spectra of BL Lacertae (BLL) objects ZBLLAC available at the URL https://web.oapd.inaf.it/zbllac/. At the present date, it contains calibrated spectra for 295 BLL. For about 35% of them, we…

高能天体物理现象 · 物理学 2020-10-21 M. Landoni , R. Falomo , S. Paiano , A. Treves

This thesis investigates in the use of access log data as a source of information for identifying related scientific papers. This is done for arXiv.org, the authority for publication of e-prints in several fields of physics. Compared to…

数字图书馆 · 计算机科学 2007-05-23 Stefan Pohl

The INTEGRAL Burst Alert System (IBAS) has been developed to detect and locate in real time the gamma-ray bursts (GRBs) serendipitously observed by INTEGRAL. The IBAS software runs automatically at the INTEGRAL Science Data Centre (ISDC),…

高能天体物理现象 · 物理学 2013-02-22 Sandro Mereghetti