The MACHO Project: First Detection of the ``Parallax Effect" in Gravitational Microlensing

Details The MACHO Project: First Detection of the ``Parallax Effect" in Gravitational Microlensing The MACHO Project: First Detection of the ``Parallax Effect" in Gravitational Microlensing

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1704c&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #17.04; Bulletin of the American Astronomical Society, Vol. 26, p.1336

Astronomy and Astrophysics

Astronomy

Scientific paper

The MACHO project has recently completed the analysis of 24 Galactic bulge fields containing 1.3times 10(7) stars observed for 190 days. Approximately 45 microlensing events have been detected in this data set, and one of these events shows clear evidence of a "parallax" effect. That is, the effect of the earth's motion around the Sun can clearly be seen in the light curve. The event displayed an Einstein ring crossing time of ~ 108 days and a peak amplification of ~ 10x. The "parallax" induced asymmetry in the light curve enables us to determine a component of the velocity of the microlensing object with respect to the line connecting the Sun with the source star. The transverse component of this velocity projected to the position of the Sun is determined to be v_t ~ 54+/- 5 km/sec. This value and the timescale of the event can be used to show that the lensing event is probably due to lensing by a low mass star in the galactic disk or a brown dwarf in the galactic bulge. High resolution spectroscopy and multi-color photometry have been obtained and will provide constraints on the lens's distance and kinematic population.

Affiliated with

Also associated with

No associations

Rating

The MACHO Project: First Detection of the ``Parallax Effect" in Gravitational Microlensing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The MACHO Project: First Detection of the ``Parallax Effect" in Gravitational Microlensing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The MACHO Project: First Detection of the ``Parallax Effect" in Gravitational Microlensing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1318842