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The goal of the Laser Interferometric Gravitational-Wave Observatory (LIGO) is to detect and study gravitational waves of astrophysical origin. Direct detection of gravitational waves holds the promise of testing general relativity in the…

General Relativity and Quantum Cosmology · Physics 2009-09-29 The LIGO Scientific Collaboration , B. Abbott

The extreme variability of blazars, in both timescale and amplitude, is generally explained as the effect of a relativistic jet closely aligned to the observer's line-of-sight. Due to causality arguments, variability characteristics…

Since late 2007, we have been monitoring a large sample of known and likely gamma-ray-loud blazars at 15 GHz twice per week with the Owens Valley Radio Observatory (OVRO) 40 m Telescope. Our initial sample included the 1158 sources above…

The World Space Observatory - Ultraviolet (WSO-UV) space telescope is equipped with high dispersion (55,000) spectrographs working in the 1150-3100 {\AA} spectral range. To evaluate the impact of the design on the scientific objectives of…

Instrumentation and Methods for Astrophysics · Physics 2017-06-13 Pablo Marcos-Arenal , Ana I. Gómez de Castro , Belén Perea Abarca , Mikhail Sachkov

We provide an observation method for gravitational waves using a pulsar timing array to extend the observational frequency range up to the rotational frequency of pulsars. For this purpose, we perform an analysis of a perturbed…

General Relativity and Quantum Cosmology · Physics 2022-02-04 Chan Park

The Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope provides an unprecedented opportunity to study gamma-ray blazars. To capitalize on this opportunity, beginning in late 2007, about a year before the start of LAT…

OT 355 (4FGL J1734.3 + 3858) is a relatively rarely studied but highly variable, moderate-redshift (z = 0.975) flat-spectrum radio quasar (blazar). With this work, we aim to study its optical variability on different timescales, which can…

High Energy Astrophysical Phenomena · Physics 2025-05-30 R. Bachev , Tushar Tripathi , Alok C. Gupta , A. Kurtenkov , Y. Nikolov , A. Strigachev , S. Boeva , G. Latev , B. Spassov , M. Minev , E. Ovcharov , W. -X. Yang , Yi Liu , J. -H. Fan

High precision astrometry aims at source position determination to a very small fraction of the diffraction image size, in high SNR regime. One of the key limitations to such goal is the optical response variation of the telescope over a…

Instrumentation and Methods for Astrophysics · Physics 2021-04-08 Alberto Riva , Mario Gai , Alberto Vecchiato , Deborah Busonero , Mario G. Lattanzi , Federico Landini , Zhaoxiang Qi , Zhenghong Tang

The Virtual Observatory (VO) is realizing global electronic integration of astronomy data. One of the long-term goals of the U.S. VO project, the Virtual Astronomical Observatory (VAO), is development of services and protocols that respond…

Instrumentation and Methods for Astrophysics · Physics 2015-06-05 G. Bruce Berriman , Robert J. Hanisch , T. Joseph W. Lazio

The Near-Earth Object (NEO) Surveyor mission is a NASA observatory designed to discover and characterize near-Earth asteroids and comets. The mission's primary objective is to find the majority of objects large enough to cause severe…

LOUPE, the Lunar Observatory for Unresolved Polarimetry of the Earth, is a small, robust spectro-polarimeter with a mission to observe the Earth as an exoplanet. Detecting Earth-like planets in stellar habitable zones is one of the key…

VOR, the versatile optimal resolution chopper spectrometer, is designed to probe dynamic phenomena that are currently inaccessible for inelastic neutron scattering due to flux limitations. VOR is a short instrument by the standards of the…

Instrumentation and Detectors · Physics 2015-06-22 P. P. Deen , A. Vickery , K. H. Andersen , R. Hall-Wilton

LOFAR is a new form of radio telescope which can detect radio emission from air showers induced by very high-energy cosmic rays. It can also look for radio emission from particle cascades on the Moon induced by ultra high-energy cosmic rays…

Instrumentation and Methods for Astrophysics · Physics 2015-05-27 S. Thoudam , G. v. Aar , M. v. d. Akker , L. Bähren , A. Corstanje , H. Falcke , J. R. Hörandel , A. Horneffer , C. James , M. Mevius , O. Scholten , K. Singh , S. ter Veen

Blazars are known for their extreme variability across the electromagnetic spectrum. Variability at very short timescales can push the boundaries between competing models offering us much needed discriminating power. This is particularly…

The Virtual Observatory (VO) is an international attempt to collect astronomical data (images, simulation, mission-logs, etc), organize it and develop tools that let astronomers access this huge amount of information. The VO not only…

Instrumentation and Methods for Astrophysics · Physics 2015-03-17 Florian Freistetter , Giulia Iafrate , Massimo Ramella

Remote observations are often limited by user interfaces, which seem frozen to another computer era: low performances, outdated programming languages, command-line scripting, high version-dependent software. Instead, web-based tools are…

Instrumentation and Methods for Astrophysics · Physics 2025-01-15 Davide Ricci , Lorenzo Cabona , Bernardo Salasnich , Luciano Nicastro , Luca Fini , Andrea Damonte , Silvano Tosi , Takashi Shibata

The small solar-system bodies that reside between 30 and 50 AU are often referred to as the Trans Neptunian Objects, or TNOs. A far-infrared (FIR) mission with survey capabilities, like the prospective Cryogenic Aperture Large Infrared…

Earth and Planetary Astrophysics · Physics 2015-05-19 J. M. Bauer , P. F. Goldsmith , C. M. Bradford , A. J. Lovell

Blazars are extremely variable objects emitting radiation across the electromagnetic spectrum and showing variability on time scales from minutes to years. For the understanding of the emission mechanisms, simultaneous multi-wavelength…

Instrumentation and Methods for Astrophysics · Physics 2017-08-09 Daniela Dorner , Thomas Bretz , Magdalena Gonzalez , Ruben Alfaro , Gagik Tovmassian

We present a description of A dual-Beam pOlarimetric Robotic Aperture for the Sun (ABORAS), to serve as a Solar input with a dedicated Stokes V polarimeter for the HARPS3 high-resolution spectrograph. ABORAS has three main science drivers:…

Instrumentation and Methods for Astrophysics · Physics 2022-07-20 Casper Farret Jentink , Annelies Mortier , Frans Snik , Patrick Dorval , Samantha J. Thompson , Ramon Navarro , Tim Naylor

The Space InfraRed Telescope Facility (SIRTF) is a space-borne, cryogenically-cooled infrared observatory capable of studying objects ranging from our Solar System to the distant reaches of the Universe. SIRTF is the final element in NASA's…

Astrophysics · Physics 2007-05-23 Bernhard Brandl , the IRS Team
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