Results 31 to 40 of about 4,973 (222)

Optical-radio positional offsets for active galactic nuclei [PDF]

Astronomy & Astrophysics, 2013
Context. It will soon become possible to directly link the most accurate radio reference frame with the Gaia optical reference frame using many common extragalactic objects. It is important to know the level of coincidence between the radio and optical positions of compact active galactic nuclei (AGN). Aims.
Orosz, Gábor, Frey, Sándor
openaire   +3 more sources

Letter to Nature: An ultra-relativistic outflow from a neutron star accreting gas from a companion.

, 2004
Collimated relativistic outflows—also known as jets—are amongst the most energetic phenomena in the Universe. They are associated with supermassive black holes in distant active galactic nuclei1, accreting stellar-mass black holes and neutron stars in ...
Johnston, H., Spencer, R, Tzioumis, T., Wu, Kinwah, Wu, K., Tzioumis, Tasso, van der Klis, M, Fender, Rob, Michiel van der Klis, Kinwah Wu, Jonker, P, Ralph Spencer, Wu, KW, Johnston, H, Tzioumis, T, Peter Jonker, Fender, R., Jonker, Peter, van der Klis, Michiel, van der Klis, M., Johnston, Helen, Helen Johnston, Spencer, Ralph, Jonker, P., Tasso Tzioumis, Fender, R, Spencer, R., Rob Fender   +27 more
core   +1 more source

Millimeter-Wave Monitoring of Active Galactic Nuclei with the Africa Millimetre Telescope

Galaxies, 2019
Active galactic nuclei are the dominant sources of gamma rays outside our galaxy and are also candidates for the source of ultra-high energy cosmic rays.
Michael Backes, Markus Böttcher, Heino Falcke   +2 more
doaj   +1 more source

VLBI observations of nearby radio loud active galactic nuclei

Journal of Physics: Conference Series, 2008
6 pages, 7 figures, Proceedings for "The Universe under the Microscope" (AHAR 2008), April 2008, to be published in Journal of Physics: Conference Series by Institute of Physics Publishing; R. Schoedel, A. Eckart, S. Pfalzner, and E.
GIOVANNINI, GABRIELE, LIUZZO, ELISABETTA TEODORINA, Giroletti M., Taylor G. B.   +3 more
openaire   +3 more sources

Gamma-Ray Bursts and Radio Loud Active Galactic Nuclei [PDF]

AIP Conference Proceedings, 2004
8 pages, 2 figures invited talk at the Symposium: "Plasmas in the Laboratory and in the Universe: new insights and new challenges", September 16-19, 2003, Como ...
openaire   +2 more sources

Radio observations of active galactic nuclei with mm-VLBI [PDF]

The Astronomy and Astrophysics Review, 2017
Over the past few decades, our knowledge of jets produced by active galactic nuclei (AGN) has greatly progressed thanks to the development of very-long-baseline interferometry (VLBI). Nevertheless, the crucial mechanisms involved in the formation of the plasma flow, as well as those driving its exceptional radiative output up to TeV energies, remain to
B. Boccardi, T. P. Krichbaum, E. Ros, J. A. Zensus   +3 more
openaire   +3 more sources

Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948

Galaxies, 2021
We present VLA Low-band Ionosphere and Transient Experiment (VLITE) 338 MHz observations of the galaxy cluster CL 0838+1948. We combine the VLITE data with Giant Metrewave Radio Telescope 610 MHz observations and survey data.
Simona Giacintucci, Tracy Clarke, Namir E. Kassim, Wendy Peters, Emil Polisensky   +4 more
doaj   +1 more source

Seedless One‐Pot Synthesis of Colloidal InAs Quantum Dots Enabling a High‐Accuracy Photoplethysmography Oximeter

Advanced Science, EarlyView.
A real‐time, non‐contact photoplethysmography (PPG) system based on InAs colloidal quantum dots (CQDs) synthesized via a seedless injection synthesis is demonstrated. The measured oxygen saturation shows considerable agreement with commercial PPG devices.
Beom Kwan Kim, Seungin Jee, Yongnam Ahn, In‐Suh Lee, Dongeon Kim, Seongchong Park, Yujin Jung, In‐Ho Bae, Se‐Woong Baek   +8 more
wiley   +1 more source

The location and kinematics of the emission line regions in Active Galactic Nuclei [PDF]

, 2008
This thesis contains the results from a study of the optical emission lines of various samples of active galactic nuclei (AGN). We have used three separate techniques to determine the precise kinematics and the relative location of the emission line ...
Mullaney, J R, Mullaney, J.R.
core  

VLA FRAMEx. III. Circumnuclear Radio Emission Mechanisms in Hard X-Ray Selected Active Galactic Nuclei

The Astrophysical Journal
We present Stokes I continuum analysis for a volume-limited sample (
Andrew J. Sargent, Alexander J. van der Horst, Megan C. Johnson, Nathan J. Secrest, Travis C. Fischer, Onic I. Shuvo, Macon A. Magno, Luis C. Fernandez   +7 more
doaj   +1 more source