Results 11 to 20 of about 41,651 (296)

Halometry from astrometry [PDF]

Journal of Cosmology and Astroparticle Physics, 2018
Halometry---mapping out the spectrum, location, and kinematics of nonluminous structures inside the Galactic halo---can be realized via variable weak gravitational lensing of the apparent motions of stars and other luminous background sources. Modern astrometric surveys provide unprecedented positional precision along with a leap in the number of ...
Neal Weiner, Ken Van Tilburg, Anna-Maria Taki   +2 more
openaire   +5 more sources

LISA Galactic Binaries with Astrometry from Gaia DR3 [PDF]

Astrophysical Journal, 2023
Galactic compact binaries with orbital periods shorter than a few hours emit detectable gravitational waves (GWs) at low frequencies. Their GW signals can be detected with the future Laser Interferometer Space Antenna (LISA).
T. Kupfer, V. Korol, T. Littenberg, Sweta Shah, E. Savalle, P. Groot, T. Marsh, M. Le Jeune, G. Nelemans, A. Pala, A. Petiteau, G. Ramsay, D. Steeghs, S. Babak   +13 more
semanticscholar   +1 more source

Polarimetry and astrometry of NIR flares as event horizon scale, dynamical probes for the mass of Sgr A* [PDF]

Astronomy & Astrophysics, 2023
We present new astrometric and polarimetric observations of flares from Sgr A* obtained with GRAVITY, the near-infrared interferometer at ESO’s Very Large Telescope Interferometer (VLTI), bringing the total sample of well-covered astrometric flares to ...
R. Abuter, N. Aimar, P. A. Seoane, A. Amorim, M. Bauböck, J. Berger, H. Bonnet, G. Bourdarot, W. Brandner, V. Cardoso, Y. Clénet, R. Davies, P. Zeeuw, J. Dexter, A. Drescher, A. Eckart, F. Eisenhauer, H. Feuchtgruber, G. Finger, N. F. Schreiber, A. Foschi, P. Garcia, 16 F.Gao, Z. Gelles, E. Gendron, R. Genzel, S. Gillessen, M. Hartl, X. Haubois, F. Haussmann, G. Heißel, T. Henning, S. Hippler, M. Horrobin, L. Jochum, L. Jocou, A. Kaufer, P. Kervella, S. Lacour, V. Lapeyrère, J. L. Bouquin, P. Lena, D. Lutz, F. Mang, N. More, T. Ott, T. Paumard, K. Perraut, G. Perrin, O. Pfuhl, S. Rabien, D. Ribeiro, M. Bordoni, S. Scheithauer, J. Shangguan, T. Shimizu, 15 J.Stadler, O. Straub, C. Straubmeier, E. Sturm, L. Tacconi, F. Vincent, S. Fellenberg, F. Widmann, M. Wielgus, E. Wieprecht, E. Wiezorrek, J. Woillez, Colorado Ave   +68 more
semanticscholar   +1 more source

Dissecting the stochastic gravitational wave background with astrometry [PDF]

Journal of Cosmology and Astroparticle Physics, 2023
Astrometry, the precise measurement of star motions, offers an alternative avenue to investigate low-frequency gravitational waves through the spatial deflection of photons, complementing pulsar timing arrays reliant on timing residuals.
Mesut Çalışkan, Yifan Chen, Liang Dai, Neha Anil Kumar, Isak Stomberg, Xiao Xue   +5 more
semanticscholar   +1 more source

Astrometry and Photometry for ≈1000 L, T, and Y Dwarfs from the UKIRT Hemisphere Survey [PDF]

Astronomical Journal, 2023
We present the positions, proper motions, and near-infrared photometry for 966 known objects with spectral types later than M that were observed as part of the the UKIRT Hemisphere Survey (UHS).
A. Schneider, J. Munn, F. Vrba, J. Bruursema, S. Dahm, S. Williams, Michael C. Liu, B. Dorland   +7 more
semanticscholar   +1 more source

High-precision Astrometry and Photometry with the JWST/MIRI Imager [PDF]

Publications of the Astronomical Society of the Pacific, 2023
Astrometry is one of the main pillars of astronomy, and one of its oldest branches. Over the years, an increasing number of astrometric works by means of Hubble Space Telescope (HST) data have revolutionized our understanding of various phenomena.
M. Libralato, I. Argyriou, D. Dicken, Macarena García Marín, P. Guillard, D. Hines, P. Kavanagh, S. Kendrew, David R. Law, A. Noriega-Crespo, J. Álvarez-Márquez   +10 more
semanticscholar   +1 more source

Mass distribution in the Galactic Center based on interferometric astrometry of multiple stellar orbits [PDF]

Astronomy & Astrophysics, 2021
The stars orbiting the compact radio source Sgr A* in the Galactic Centre are precision probes of the gravitational field around the closest massive black hole.
G. C. R. Abuter, N. Aimar, A. Amorim, J. Ball, M. Baubock, J. Berger, H. Bonnet, G. Bourdarot, W. Brandner, V. Cardoso, Y. Cl'enet, Y. Dallilar, R. Davies, P. Zeeuw, J. Dexter, A. Drescher, F. Eisenhauer, N. F. Schreiber, A. Foschi, P. Garcia, F. Gao, E. Gendron, R. Genzel, S. Gillessen, M. Habibi, X. Haubois, G. Heißel, T. Henning, S. Hippler, M. Horrobin, L. Jochum, L. Jocou, A. Kaufer, P. Kervella, S. Lacour, V. Lapeyrère, J. L. Bouquin, P. L'ena, D. Lutz, T. Ott, T. Paumard, K. Perraut, G. Perrin, O. Pfuhl, S. Rabien, J. Shangguan, T. Shimizu, S. Scheithauer, J. Stadler, A. Stephens, O. Straub, C. Straubmeier, E. Sturm, L. Tacconi, K. Tristram, F. Vincent, S. Fellenberg, F. Widmann, E. Wieprecht, E. Wiezorrek, J. Woillez, Ş. Yazici, A. Young, G. Zins   +63 more
semanticscholar   +1 more source

Probing parity violation in the stochastic gravitational wave background with astrometry [PDF]

Physical Review D, 2023
Astrometry holds the potential for testing fundamental physics through the effects of the Stochastic Gravitational Wave Background (SGWB) in the $\sim 1-100$ nHz frequency band on precision measurements of stellar positions.
Q. Liang, Meng-Xiang Lin, M. Trodden, Sam S. C. Wong   +3 more
semanticscholar   +1 more source

Stochastic gravitational wave background constraints from Gaia DR3 astrometry [PDF]

Monthly notices of the Royal Astronomical Society, 2023
Astrometric surveys can be used to constrain the stochastic gravitational wave background (SGWB) at very low frequencies. We use proper motion data provided by Gaia DR3 to fit a generic dipole+quadrupole field.
S. Jaraba, J. García-Bellido, S. Kuroyanagi, S. Ferraiuolo, M. Braglia   +4 more
semanticscholar   +1 more source

The MSPSRπ catalogue: VLBA astrometry of 18 millisecond pulsars [PDF]

Monthly notices of the Royal Astronomical Society, 2022
With unparalleled rotational stability, millisecond pulsars (MSPs) serve as ideal laboratories for numerous astrophysical studies, many of which require precise knowledge of the distance and/or velocity of the MSP.
H. Ding, A. Deller, B. Stappers, T. Lazio, D. Kaplan, S. Chatterjee, W. Brisken, J. Cordes, P. Freire, E. Fonseca, I. Stairs, L. Guillemot, A. Lyne, I. Cognard, D. Reardon, G. Theureau   +15 more
semanticscholar   +1 more source