Results 21 to 30 of about 323,555 (299)

Quasar Proper Motions and Low-Frequency Gravitational Waves [PDF]

, 1996
We report observational upper limits on the mass-energy of the cosmological gravitational-wave background, from limits on proper motions of quasars. Gravitational waves with periods longer than the time span of observations produce a simple pattern of ...
Backer D. C., Bertotti B., Bondi H., Carl R. Gwinn, Demetrios N. Matsakis, Hogan C. J., Linder E. V., Mark Birkinshaw, Mathews J., T. Marshall Eubanks, Ted Pyne   +10 more
core   +3 more sources

Orbits of LMC/SMC with recent ground-based proper motions

EPJ Web of Conferences, 2012
In recent years, with new ground-based and HST measurements of proper motions of the Magellanic Clouds being published, a need of a reanalysis of possible orbital history has arisen.
Růžička A., Jungwiert B., Bartošková K., Costa E.   +3 more
doaj   +1 more source

Proper Motions of Water Masers in W49 N Measured by KaVA

The Astrophysical Journal, 2023
We report the proper motions of 22 GHz water masers toward W49 N that were observed by the KVN and VERA Array (KaVA) during 2017 February–May. We found 263, 268, and 310 features in three successive epochs; they were distributed in a region of size 4 × 4
Kitiyanee Asanok, Malcolm D. Gray, Tomoya Hirota, Koichiro Sugiyama, Montree Phetra, Busaba H. Kramer, Tie Liu, Kee-Tae Kim, Bannawit Pimpanuwat   +8 more
doaj   +1 more source

Fixing the Reference Frame for PPMXL Proper Motions Using Extragalactic Sources [PDF]

, 2014
We quantify and correct systematic errors in PPMXL proper motions using extragalactic sources from the first two LAMOST data releases and the Veron-Cetty & Veron Catalog of Quasars.
Beers, Timothy C., Carlin, Jeffrey L., Chen, Li, Deng, Li-Cai, Grabowski, Kathleen, Grillmair, Carl J., Guhathakurta, Puragra, Hou, Jin-Liang, Hou, Yong-Hui, Liu, Chao, Liu, Xiao-Wei, Luo, A-Li, Lépine, Sébastien, Newberg, Heidi Jo, Smith, Martin C., Yanny, Brian, Zhang, Hao-Tong, Zhang, Yong, Zheng, Zheng   +18 more
core   +2 more sources

Massive Hypervelocity Runaway Stars in the Large Magellanic Cloud

The Astrophysical Journal, 2023
Since the hypervelocity stars were discovered in the Milky Way, various mechanisms have been proposed to explain these runaway stars. Up to now, however, the dominant ejected mechanism of hypervelocity stars is still unclear.
Zehao Lin, Ye Xu, Chaojie Hao, Yingjie Li, Dejian Liu, Shuaibo Bian   +5 more
doaj   +1 more source

Proper Motions in the Andromeda Subgroup

, 2007
This article presents results of VLBI observations of regions of H2O maser activity in the Local Group galaxies M33 and IC10. Since all position measurements were made relative to extragalactic background sources, the proper motions of the two galaxies ...
A. Brunthaler, A. Brunthaler, A. Loeb, A.S. Kulessa, E. Corbelli, E.M. Wilcots, N.W. Evans, S. Piatek   +7 more
core   +1 more source

A 1500 deg2 near infrared proper motion catalogue from the UKIDSS Large Area Survey [PDF]

, 2013
The United Kingdom Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) began in 2005, with the start of the UKIDSS programme as a 7 year effort to survey roughly 4000 deg2 at high Galactic latitudes in Y, J, H and K bands.
A. H. Andrei, Abad, Abell, Andrei, Andrei, B. Burningham, Bakos, Becklin, Burgasser, Burgasser, Burgasser, Burningham, Burningham, Burningham, Casali, Casali, Casewell, Catalán, Collins, Cruz, Cruz, D. J. Pinfield, Day-Jones, Deacon, Deacon, Deacon, Dierickx, Dupuy, Dye, Epchtein, Faherty, Faherty, Feast, Finlator, Goldman, Gomes, Greenstein, H. R. A. Jones, Hambly, Hansen, Hawley, Hewett, Høg, Kharchenko, Kilic, Kilic, Kilic, Kirkpatrick, Kirkpatrick, Kirkpatrick, Kirkpatrick, Kirkpatrick, Kirkpatrick, Kirkpatrick, Knapp, Latham, Lawrence, Leggett, Leggett, Leggett, Leggett, Leigh Smith, Looper, Luyten, Luyten, Lépine, Lépine, Marocco, Mason, Meng, Munn, Murray, P. W. Lucas, Pinfield, Pinfield, Pinfield, R. L. Smart, Reid, Reid, Reid, Roeser, S. Catalán, Salim, Sayres, Schilbach, Scholz, Sheppard, Skrutskie, Smith, Taylor, Taylor, Vick, Warren, West, West, Zhang, Zhang   +96 more
core   +3 more sources

Proper Motions of Jets on the Kiloparsec Scale: New Results with HST

Galaxies, 2017
The Hubble Space Telescope recently celebrated 25 years of operation. Some of the first images of extragalactic optical jets were taken by HST in the mid-1990s; with time baselines on the order of 20 years and state-of-the-art astrometry techniques, we ...
Eileen T. Meyer, William B. Sparks, Markos Georganopoulos, Roeland van der Marel, Jay Anderson, Sangmo T. Sohn, John Biretta, Colin Norman, Marco Chiaberge, Eric Perlman   +9 more
doaj   +1 more source

JWST-TST Proper Motions. I. High-precision NIRISS Calibration and Large Magellanic Cloud Kinematics

The Astrophysical Journal, 2023
We develop and disseminate effective point-spread functions and geometric-distortion solutions for high-precision astrometry and photometry with the JWST NIRISS instrument. We correct field dependencies and detector effects, and assess the
Mattia Libralato, Andrea Bellini, Roeland P. van der Marel, Jay Anderson, Sangmo Tony Sohn, Laura L. Watkins, Lili Alderson, Natalie Allen, Mark Clampin, Ana Glidden, Jayesh Goyal, Kielan Hoch, Jingcheng Huang, Jens Kammerer, Nikole K. Lewis, Zifan Lin, Douglas Long, Dana Louie, Ryan J. MacDonald, Matt Mountain, Maria Peña-Guerrero, Marshall D. Perrin, Laurent Pueyo, Isabel Rebollido, Emily Rickman, Sara Seager, Kevin B. Stevenson, Jeff A. Valenti, Daniel Valentine, Hannah R. Wakeford   +29 more
doaj   +1 more source

Stars in the USNO-B1 Catalog with Proper Motions Between 1.0 and 5.0 arcseconds per year

, 2005
This paper examines a subset of objects from the USNO-B1 catalogue with listed proper motions between 1.0 and 5.0 arcseconds per year. We look at the degree of contamination within this range of proper motions, and point out the major sources of spurious
Giclas H. L., Hog E., Stephen E. Levine, Voges W.   +3 more
core   +2 more sources