The First Heroic Decade of Microlensing
نویسنده
چکیده
We describe the fundamentals of vanilla and exotic microlens-ing. Deviations from the standard form of an achromatic, time-symmetric lightcurve can be caused by the parallax and xallarap effects, finite source sized effects and binarity. Three applications of microlensing from the First Heroic Decade are reviewed in detail – namely (i) searches for compact dark objects in the Galactic halo, (ii) probes of the baryonic mass distribution in the inner Galaxy and the Andromeda Galaxy and (iii) studies of the limb darkening of source stars. Finally, we suggest four projects for the Second Heroic Decade – (i) K band microlensing towards the Bulge, (ii) pixel lensing towards the low luminosity spiral galaxy M33, (iii) polarimetry of ongoing microlensing events and (iv) astrometric mi-crolensing with the GAIA satellite.
منابع مشابه
The effect of variation of stellar dispersion velocities by the galactic latitude in interpreting gravitational microlensing observations
Our galaxy is a spiral galaxy and its stars are mostly in a thin disk and rotate around the galactic center. The vertical component of the dispersion velocity of stars is a function of the galactic latitude and decreases with increasing it. In the galactic Besancon model, this dependence is ignored and they just consider the dependence of dispersion velocity on the stellar age. Becanson model i...
متن کاملCosmological Microlensing Statistics: Variability rates for Quasars and GRB Afterglows, and implications for macrolensing magnification bias and flux ratios
The fraction of quasar’s and gamma-ray burst (GRB) afterglows that vary due to microlensing by the stellar populations of intervening elliptical/S0 galaxies is computed by combining the joint distribution of effective microlensing convergence (κ) and shear (γ) with microlensing magnification patterns. Microlensing is common in multiply imaged sources. We find that 1 in 3 multiply imaged quasars...
متن کاملPlanetary Microlensing: from Prediction to Discovery
Four planets have recently been discovered by gravitational microlensing. The most recent of these discoveries is the lightest planet known to exist around a normal star. The detection of planets in gravitational microlensing events was predicted over a decade ago. Microlensing is now a mature field of astrophysical research and the recent planet detections herald a new chapter in the hunt for ...
متن کاملThe Manifestation of the Divine Honor in the ‘Āshūrā Heroic Act
The examination of the word “‘izza” (honor) in the divine discourse and its attribution to God, the Prophet (s), and the believers is important in determining and directing the personal and social life policies. In this article (which is on the manifestation of the divine honor in Imām Ḥusayn’s heroic act), we aim to illustrate some of the honorable deeds of Imām Ḥusayn on his way from Medina t...
متن کاملApplying to Power Law galactic model toward Magellanic clouds
After one decade form gravitational microlensing experiments, hundreds microlensing events in different galactic directions and 13 to 17 event (depends of quality) toward Magellanic clouds have been found. One of the central relation in microlensing experiments is between optical depth as a model dependent parameter and the rate of observed events. Here, we redo the calculation of optical depth...
متن کامل