Statistical interpretation of Large Magellanic Cloud microlensing candidates

  title={Statistical interpretation of Large Magellanic Cloud microlensing candidates},
  author={Sohrab Rahvar},
  journal={Monthly Notices of the Royal Astronomical Society},
  • S. Rahvar
  • Published 2 September 2003
  • Physics
  • Monthly Notices of the Royal Astronomical Society
After a decade of gravitational microlensing experiments, a dozen microlensing candidates in the direction of the stars of the Large Magellanic Cloud (LMC) have been detected by the EROS and MACHO groups. Recently it was shown that the distribution of the duration of the observed LMC microlensing events is significantly narrower than what is expected from the standard halo model. In this article we make the same comparison, using non-standard halo models and considering the contribution of non… 

Figures and Tables from this paper

The origin of the microlensing events observed towards the LMC and the stellar counterpart of the Magellanic stream
We introduce a novel theoretical model to explain the long-standing puzzle of the nature of the microlensing events reported towards the Large Magellanic Cloud (LMC) by the MACHO and OGLE
Microlensing by halo MACHOs with a spatially varying mass function
The main aim of microlensing experiments is to evaluate the mean mass of massive compact halo objects (MACHOs) and the mass fraction of the Galactic halo made by this type of dark matter. Statistical
Large Magellanic Cloud Microlensing Optical Depth with Imperfect Event Selection
I present a new analysis of the MACHO Project 5.7 yr Large Magellanic Cloud (LMC) microlensing data set that incorporates the effects of contamination of the microlensing event sample by variable
The EROS2 search for microlensing events towards the spiral arms: the complete seven season results
the EROS-2 project has been designed to search for microlensing events towards any dense stellar field. The densest parts of the Galactic spiral arms have been monitored to maximize the microlensing
The Magellanic Stream in Modified Newtonian Dynamics
The dynamics of the Magellanic Stream (MS) as a series of clouds extending from the Magellanic Clouds (MCs) to the south Galactic pole is affected by the distribution and the amount of matter in the
Simulation of a strategy for the pixel lensing of M87 using the Hubble Space Telescope
In this paper, we propose a new strategy for the pixel-lensing observations of M87 in the Virgo cluster using the Hubble Space Telescope (HST). In contrast to a previous observational strategy by
Possibility of magnetic mass detection by the next generation of microlensing experiments
We study the possibility of magnetic mass detection using the gravitational microlensing technique. Recently, the theoretical effect of magnetic mass in NUT space on the microlensing light curve has
Astrophysics in 2004
In this 14th edition of ApXX, we bring you the Sun () and Stars (), the Moon and Planets (), a truly binary pulsar (), a kinematic apology (), the whole universe ( and ), reconsideration of old


Are there MACHOs in the Milky Way halo
Microlensing searches aim to detect compact halo dark matter via its gravitational lensing effect on stars within the Large Magellanic Cloud. These searches have led to the claim that roughly one
The MACHO Project: Microlensing Results from 5.7 Years of Large Magellanic Cloud Observations
We report on our search for microlensing toward the Large Magellanic Cloud (LMC). Analysis of 5.7 yr of photometry on 11.9 million stars in the LMC reveals 13-17 microlensing events. A detailed
Can EROS and MACHO be detecting the galactic spheroid instead of the galactic halo?
It is shown that, although the rate of events is lower than predicted by a galactic halo made of microlensing objects, it is still significant for EROS/MACHO observations and, because of the different matter distributions in the halo and spheroid components, future measurements ofmicrolensing in the galactic bulge and in M31 can provide information about the amounts of dark objects in the different galactic components.
Galactic microlensing as a method of detecting massive compact halo objects
The dark matter of the Galaxy may well consist of Jupiters, brown dwarfs, or the remnants of an early generation of stars. In 1986, Paczynski suggested that a population of such objects could be
The macho project first-year large magellanic cloud results: The microlensing rate and the nature of the galactic dark halo
Since July 1992, the MACHO project has been carrying out long-term photometric monitoring of over 20 million stars in the Magellanic Clouds and Galactic bulge. Our aim is to search for the very rare
Not enough stellar mass Machos in the Galactic halo
Contribution of Brown Dwarfs and White Dwarfs to Recent Microlensing Observations and to the Halo Mass Budget
We examine the recent results of the MACHO collaboration toward the Large Magellanic Cloud in terms of a halo brown dwarf or white dwarf population. The possibility that most of the microlensing
Gravitational microlensing by the galactic halo
A simple model of microlensing by massive objects that might be present in the halo of the Galaxy is presented. It is shown that in any nearby galaxy one star out of a million is strongly microlensed
Implications of White Dwarf Galactic Halos
Motivated by recent measurements which suggest that roughly half the mass of the galactic halo may be in the form of white dwarfs, we study the implications of such a halo. We first use current
Further Constraints on White Dwarf Galactic Halos
The suggestion that roughly half the mass of the Galactic halo might be in the form of white dwarfs, together with the limits on its mass fraction in faint red stars and on the initial metallicity of