Results 51 to 60 of about 11,731 (215)

Microarcsecond VLBI pulsar astrometry with PSRPI I. Two binary millisecond pulsars with white dwarf companions [PDF]

, 2016
Model-independent distance constraints to binary millisecond pulsars (MSPs) are of great value to both the timing observations of the radio pulsars, and multiwavelength observations of their companion stars.
Brisken, W. F., Chatterjee, S., Cordes, J. M., Deller, A. T., Goss, W. M., Janssen, G. H., Kaplan, D. L., Lazio, T. J. W., Lyne, A., Petrov, L., Stappers, B. W., Vigeland, S. J.   +11 more
core   +2 more sources

Satellites and Small Bodies With ALMA: Insights Into Solar System Formation and Evolution

AGU Advances, Volume 6, Issue 6, December 2025.
Abstract Our understanding of the formation and evolution of planetary systems has made major advances in the past decade. This progress has been driven in large part by the Atacama Large Millimeter/submillimeter Array (ALMA), which has given us an unprecedented view of solar system bodies themselves, and of the structure and chemistry of forming ...
Katherine de Kleer, Michael E. Brown, Martin Cordiner, Richard Teague   +3 more
wiley   +1 more source

The Radio Parallax of the Crab Pulsar: A First VLBI Measurement Calibrated with Giant Pulses

The Astrophysical Journal, 2023
We use four observations with the European very long baseline interferometry (VLBI) network to measure the first precise radio parallax of the Crab Pulsar. We found two in-beam extragalactic sources just outside the Crab Nebula, with one bright enough to
Rebecca Lin, Marten H. van Kerkwijk, Franz Kirsten, Ue-Li Pen, Adam T. Deller   +4 more
doaj   +1 more source

Improving the Accuracy of Radio Astrometry [PDF]

International Astronomical Union Colloquium, 2000
AbstractThe International Celestial Reference Frame (ICRF) is currently realized by the radio positions of compact extragalactic objects obtained by the technique of Very Long Baseline Interferometry (VLBI). The positions of the defining sources with the highest quality are estimated to be accurate at the 0.25 milliarcsecond (mas) level.
openaire   +1 more source

Optical and radio astrometry of the galaxy associated with FRB 150418 [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2016
Abstract A fading radio source, coincident in time and position with the fast radio burst FRB 150418, has been associated with the galaxy WISE J071634.59−190039.2. Subsequent observations of this galaxy have revealed that it contains a persistent, but variable, radio source. We present e-Multi-Element Radio Linked Interferometer Network,
Bassa, C. G., Beswick, R., Tingay, S. J., Keane, E. F., Bhandari, S., Johnston, S., Totani, T., Tominaga, N., Yasuda, N., Stappers, B. W., Barr, E. D., Kramer, M., Possenti, A.   +12 more
openaire   +6 more sources

Reassessing the Relationship Between Meteor Radio Afterglows and Optical Persistent Trains

Journal of Geophysical Research: Space Physics, Volume 130, Issue 9, September 2025.
Abstract Meteor radio afterglows (MRAs) and optical persistent trains (PTs) are two types of long‐lived phenomena which are occasionally observed following the occurrence of a meteor. Both phenomena are thought to be produced by intrinsic emission mechanisms; PTs have been associated with chemiluminescent reactions between meteoric metals and ...
L. E. Cordonnier, K. S. Obenberger, G. B. Taylor, J. M. Holmes, J. Dowell, D. Vida   +5 more
wiley   +1 more source

The Celestial Reference Frame at K Band: Imaging. I. The First 28 Epochs

The Astronomical Journal, 2023
We present K -band (24 GHz) images of 731 compact extragalactic radio sources with submilliarcsecond resolution, based on radio interferometric observations made with the Very Long Baseline Array of 10 telescopes during 29 day long sessions spanning from
Aletha de Witt, Christopher S. Jacobs, David Gordon, K-band Celestial Reference Frame Collaboration, Michael Bietenholz, Marisa Nickola, Alessandra Bertarini   +6 more
doaj   +1 more source

Monitoring the Large Proper Motions of Radio Sources in the Orion BN/KL Region

, 2008
We present absolute astrometry of four radio sources in the Becklin-Neugebauer/Kleinman-Low (BN/KL) region, derived from archival data (taken in 1991, 1995, and 2000) as well as from new observations (taken in 2006).
Arcadio Poveda, Bower G. C., Christine Allen, Felli M., Felli M., Furuya R. S., Kaifu N., Karl M. Menten, Laura Gómez, Laurent Loinard, Luis F. Rodríguez, Raga A. C., Rodriguez-Franco A., Susana Lizano   +13 more
core   +1 more source

Improving the Reference Frame by Radio–and Optical Astrometry of Radio Stars [PDF]

International Astronomical Union Colloquium, 1991
AbstractA longterm program of precise radio – and optical astrometry of selected radio stars has been conducted in the last decade by our observatories using the VLA and astrographs on both hemispheres. Positions of 54 stars north of −26 deg. declination including 6 MASER stars have been obtained.
Chr. de Vegt, N. Zacharias, K.J. Johnston, R. Hindsley   +3 more
openaire   +1 more source

A strong radio brightening at the jet base of M87 during the elevated very-high-energy gamma-ray state in 2012

, 2014
We report our intensive radio monitoring observations of the jet in M87 with the VLBI Exploration of Radio Astrometry (VERA) and the European VLBI Network (EVN) from February 2011 to October 2012, together with contemporaneous high-energy gamma-ray light
Akiyama, K., Beilicke, M., Casadio, C., Cesarini, A., Cheung, C. C., D'Ammando, F., Doi, A., Giovannini, G., Giroletti, M., Gomez, J. L., Gurwell, M. A., Hada, K., Honma, M., Kino, M., Koyama, S., Krawczynski, H., Nagai, H., Nakahara, S., Niinuma, K., Orienti, M., Sawada-Satoh, S.   +20 more
core   +2 more sources