Results 71 to 80 of about 11,793 (207)

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

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses VIII. Deconvolution of high resolution near-IR images and simple mass models for 7 gravitationally lensed quasars [PDF]

, 2010
We apply the iterative MCS deconvolution method (ISMCS) to near-IR HST archives data of seven gravitationally lensed quasars currently monitored by the COSMOGRAIL collaboration: HE 0047-1756, RX J1131-1231, SDSS J1138+0314, SDSS J1155+6346, SDSS J1226 ...
Biggs, Bolton, Bradač, Brewer, Chantry, Chen, Claeskens, Cohn, Courbin, D. Sluse, Dai, Dalal, de Vaucouleurs, Eigenbrod, Eigenbrod, Evans, Faber, Fadely, Ferreras, Hagen, Inada, Jackson, Kassiola, Keeton, Keeton, Keeton, Keeton, Keeton, Keeton, Kochanek, Kochanek, Kochanek, Kochanek, Koopmans, Koopmans, Koopmans, Kovalev, Lagattuta, Lehár, MacLeod, Magain, Magain, Mao, McKean, Metcalf, Mittal, Momcheva, More, Morgan, Morgan, Ofek, P. Magain, Patnaik, Patnaik, Pindor, Porcas, Refsdal, Ros, Saha, Sluse, Sluse, Sluse, Sugai, V. Chantry, Vuissoz, Wisotzki, Wisotzki, Witt, Wucknitz, Yonehara, Yoo   +70 more
core   +1 more source

Isolated Neutron Stars as Science Validation for XMM2ATHENA: Ensuring Robust Data for Future X‐Ray Astronomy

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT The discovery of radio‐quiet, x‐ray thermally emitting isolated neutron stars (XINSs) in the ROSAT All‐Sky Survey revealed a previously overlooked component of the neutron star population. Advancements in x‐ray instrumentation and the availability of deep, wide‐area optical surveys now enable us to explore XINSs at fainter x‐ray fluxes and ...
Adriana Mancini Pires, Christian Motch, Axel Schwope, Iris Traulsen, Jean Ballet, Sudip Chakraborty, David Homan, Jan Kurpas, Ada Nebot Gomez‐Moràn, François‐Xavier Pineau, Hugo Tranin, Natalie Webb   +11 more
wiley   +1 more source

Constraints on the Persistent Radio Source Associated with FRB 20190520B Using the European VLBI Network

The Astrophysical Journal Letters, 2023
We present very long baseline interferometry (VLBI) observations of a continuum radio source potentially associated with the fast radio burst source FRB 20190520B.
Shivani Bhandari, Benito Marcote, Navin Sridhar, Tarraneh Eftekhari, Jason W. T. Hessels, Danté M. Hewitt, Franz Kirsten, Omar S. Ould-Boukattine, Zsolt Paragi, Mark P. Snelders   +9 more
doaj   +1 more source

Differential Astrometry over 15 degrees

, 1998
We observed the pair of radio sources 1150+812 and 1803+784 in November 1993 with a VLBI array, simultaneously recording at 8.4 and 2.3 GHz. We determined the angular separation between the two sources with submilliarcsecond accuracy by using ...
Guirado, J. C., Marcaide, J. M., Perez-Torres, M. A., Ros, E.   +3 more
core   +1 more source

Multi‐Instrument and SAMI3‐TIDAS Data Assimilation Analysis of Three‐Dimensional Ionospheric Electron Density Variations During the April 2024 Total Solar Eclipse

Journal of Geophysical Research: Space Physics, Volume 129, Issue 9, September 2024.
Abstract This paper conducts a multi‐instrument and data assimilation analysis of the three‐dimensional ionospheric electron density responses to the total solar eclipse on 08 April 2024. The altitude‐resolved electron density variations over the continental US and adjacent regions are analyzed using the Millstone Hill incoherent scatter radar data ...
Ercha Aa, Joseph Huba, Shun‐Rong Zhang, Anthea J. Coster, Philip J. Erickson, Larisa P. Goncharenko, Juha Vierinen, William Rideout   +7 more
wiley   +1 more source

A Radio Counterpart to a Jupiter-mass Binary Object in Orion

The Astrophysical Journal Letters
Using James Webb Space Telescope near-infrared data of the inner Orion Nebula, Pearson & McCaughrean detected 40 Jupiter-mass binary objects (JuMBOs).
Luis F. Rodríguez, Laurent Loinard, Luis A. Zapata   +2 more
doaj   +1 more source

Astrometric detection of exoplanets from the ground

, 2013
Astrometry is a powerful technique to study the populations of extrasolar planets around nearby stars. It gives access to a unique parameter space and is therefore required for obtaining a comprehensive picture of the properties, abundances, and ...
Lazorenko, P. F., Mérand, A., Queloz, D., Sahlmann, J., Ségransan, D., Woillez, J.   +5 more
core   +1 more source

HAWC J0630+186 Could Not Be Powered by PSR J0630+19

The Astrophysical Journal
3HWC J0630+186 is one of the very-high-energy gamma-ray sources listed in the third High-Altitude Water Cherenkov catalog; however, its origin remains unidentified.
Bojun Wang, Xiaohong Cui, Jiguang Lu, Heng Xu, Renxin Xu   +4 more
doaj   +1 more source

JWST imaging of the closest globular clusters—I. Possible infrared excess among white dwarfs in NGC 6397

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin, D. Nardiello, M. Salaris, M. Libralato, P. Bergeron, A. J. Burgasser, D. Apai, M. Griggio, M. Scalco, J. Anderson, R. Gerasimov, A. Bellini   +11 more
wiley   +1 more source