Results 51 to 60 of about 11,137 (251)

Gravitational Microlensing near Caustics. II. Cusps [PDF]

The Astrophysical Journal, 2002
52 pages, 12 figures. Revised version, minor changes. Accepted to ApJ, to appear in the November 20, 2002 issue (v580).
Gaudi, B. Scott, Petters, A. O.
openaire   +2 more sources

Astronomical Signatures of Dark Matter

Advances in High Energy Physics, Volume 2014, Issue 1, 2014., 2014
Several independent astronomical observations in different wavelength bands reveal the existence of much larger quantities of matter than what we would deduce from assuming a solar mass to light ratio. They are very high velocities of individual galaxies within clusters of galaxies, higher than expected rotation rates of stars in the outer regions of ...
Paul Gorenstein, Wallace Tucker, Anselmo Meregaglia   +2 more
wiley   +1 more source

Gravitational Microlensing of a Reverberating Quasar Broad Line Region - I. Method and Qualitative Results [PDF]

, 2011
The kinematics and morphology of the broad emission line region (BELR) of quasars are the subject of significant debate. The two leading methods for constraining BELR properties are microlensing and reverberation mapping.
Abajas, Abajas, Bate, Bentz, Bentz, Bentz, Blandford, Brewer, Denney, Elvis, G. F. Lewis, Garsden, Gómez-Álvarez, H. Garsden, Horne, Huchra, Inada, Kaspi, Kayo, Kayser, Keeton, Lamer, Lewis, Lewis, Lewis, Mortonson, Mosquera, Mosquera, Myers, N. F. Bate, Nemiroff, Ota, O’Dowd, Pancoast, Peterson, Peterson, Peterson, Poindexter, Richards, Robinson, Schmidt, Schneider, Sluse, Turner, Udalski, Walsh, Wambsganss, Wambsganss, Wayth, Wyithe   +49 more
core   +1 more source

Die Suche nach kalten, fremden Welten

Physik in unserer Zeit, Volume 55, Issue 3, Page 140-147, May 2024.
Die meisten der heute bekannten extrasolaren Planeten umkreisen ihren Mutterstern auf engen Umlaufbahnen in weniger als 100 Tagen. Gesteinsplaneten mit größeren Bahnradien sind von herausragender Bedeutung für Theorien der Planetenentstehung. Die Mikrogravitationslinsenmethode bietet eine hervorragende Möglichkeit, solche Planeten zu finden – und das ...
Markus Hundertmark, Yiannis Tsapras
wiley   +1 more source

Four Planets Found through Microlensing Events Involving Faint Source Stars

The Astronomical Journal
To conduct a comprehensive demographic study of microlensing planets, it is essential to detect all planetary signals that exceed a predefined threshold through a detailed analysis of survey data.
Cheongho Han, Michael D. Albrow, Chung-Uk Lee, Sun-Ju Chung, Andrew Gould, Kyu-Ha Hwang, Youn Kil Jung, Yoon-Hyun Ryu, Yossi Shvartzvald, In-Gu Shin, Jennifer C. Yee, Hongjing Yang, Weicheng Zang, Sang-Mok Cha, Doeon Kim, Dong-Jin Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge   +20 more
doaj   +1 more source

The gravitational microlens influence on X-ray spectral line generated by an AGN accretion disc [PDF]

Serbian Astronomical Journal, 2001
The influence of gravitational microlensing on the X-ray spectral line profiles originated from a relativistic accretion disc has been studied. Using a disc model, we show that microlensing can induce noticeable changes in the line shapes when the ...
Popović L.Č., Mediavilla E.G., Munoz J.A., Dimitrijević M.S., Jovanović P.   +4 more
doaj   +1 more source

Inferring statistics of planet populations by means of automated microlensing searches [PDF]

, 2008
(abridged) The study of other worlds is key to understanding our own, and not only provides clues to the origin of our civilization, but also looks into its future. Rather than in identifying nearby systems and learning about their individual properties,
Bozza, V., Burgdorf, M. J., Dominik, M., Hessman, F. V., Hinse, T. C., Horne, K., Hundertmark, M., Jorgensen, U. G., Kane, S., Mancini, L., Masi, G., Novati, S. Calchi, Rahvar, S., Scarpetta, G., Steele, I. A., Street, R. A., Teuber, J., Tsapras, Y., Wambsganss, J., Wyrzykowski, L.   +19 more
core   +1 more source

The influence of microlensing on the shape of the AGN Fe K-alpha line

, 2002
We study the influence of gravitational microlensing on the AGN Fe K-alpha line confirming that unexpected enhancements recently detected in the iron line of some AGNs can be produced by this effect.
Jovanovic, P., Mediavilla, E. G., Munoz, J. A., Popovic, L. C.   +3 more
core   +2 more sources

Astrophysical applications of gravitational microlensing [PDF]

Research in Astronomy and Astrophysics, 2012
26 pages, 8 figures, review article for the special IAU issue of RAA, comments ...
openaire   +3 more sources

Dark Matter Halos from the Inside Out

Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011
The balance of evidence indicates that individual galaxies and groups or clusters of galaxies are embedded in enormous distributions of cold, weakly interacting dark matter. These dark matter “halos” provide the scaffolding for all luminous structures in the universe, and their properties comprise an essential part of the current cosmological model.
James E. Taylor, Rob Ivison
wiley   +1 more source