Hae
Aineistot 1-10 / 447
RATS-Kepler - a deep high-cadence survey of the Kepler field
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We outline the purpose, strategy and first results of a deep, high-cadence, photometric survey of the Kepler field using the Isaac Newton Telescope on La Palma and the MDM 1.3 m Telescope on Kitt Peak. Our goal was ...
Far-infrared photometry of OJ 287 with the Herschel Space Observatory
<p>Context: The blazar OJ 287 has shown a approximate to 12 year quasi-periodicity over more than a century, in addition to the common properties of violent variability in all frequency ranges. It is the strongest known ...
TESS observations of the asynchronous polar CD Ind: mapping the changing accretion geometry
We present the results of near continuous TESS optical observations of the asynchronous polar CD Ind (RX J2115-5840). The 27.9 d long light curve, with 2 min resolution, reveals remarkable changes in the magnetic accretion ...
Jet-Induced Feedback in the [O III] Lines of Early Evolution Stage Active Galactic Nuclei
<p>It is well known that active galactic nuclei (AGN) show various forms of interaction with their host galaxy, in a number of phenomena generally called AGN feedback. In particular, the relativistic plasma jets launched ...
A kilonova as the electromagnetic counterpart to a gravitational-wave source
Gravitational waves were discovered with the detection of binary black-hole mergers(1) and they should also be detectable from lower-mass neutron-star mergers. These are predicted to eject material rich in heavy radioactive ...
The disc-like host galaxies of radio-loud narrow-line Seyfert 1s
Until recently, relativistic jets were ubiquitously found to be launched from giant elliptical galaxies. However, the detection by the Fermi-LAT of gamma-ray emission from radio-loud narrow-line Seyfert 1 (RL-NLSy1) galaxies ...
The intermediate polar cataclysmic variable GK Persei 120 years after the nova explosion: a first dynamical mass study
We present a dynamical study of the intermediate polar and dwarf nova cataclysmic variable GK Persei (Nova Persei 1901) based on a multisite optical spectroscopy and R-band photometry campaign. The radial velocity curve ...
Study of the variable broadband emission of Markarian 501 during the most extreme Swift X-ray activity
<div><i>Context.</i> Markarian 501 (Mrk 501) is a very high-energy (VHE) gamma-ray blazar located at z=0.034, which is regularly monitored by a wide range of multi-wavelength instruments, from radio to VHE gamma rays. ...
Investigating the multiwavelength behaviour of the flat spectrum radio quasar CTA 102 during 2013-2017
We present a multiwavelength study of the flat-spectrum radio quasar CTA 102 during 2013-2017. We use radio-to-optical data obtained by the Whole Earth Blazar Telescope, 15 GHz data from the Owens Valley Radio Observatory, ...
Search for AGN counterparts of unidentified Fermi-LAT sources with optical polarimetry Demonstration of the technique
Context. The third Fermi-LAT catalog (3FGL) presented the data of the first four years of observations from the Fermi Gamma-ray Space Telescope mission. There are 3034 sources, 1010 of which still remain unidentified. ...