Spectroscopic and light curve characterization of bulge microlensing events

M. Soto, D. Minniti, M. Rejkuba

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Aims. Microlensing events have been observed regularly by surveys such as MACHO, OGLE and MOA. They offer an excellent way to probe the galactic structure, kinematics and stellar content. We have undertaken a follow-up study of 16 galactic microlensing events to determine masses and locations of the sources of these events within the Galaxy. Methods. Spectroscopy allows us to obtain information about the sources of the events. Low resolution spectra obtained with the Magellan I and II telescopes were analyzed to obtain radial velocities, spectral type and extinction by the method of Kane & Sahu. We also present results for the lens of the event using the microlensing light curve when possible. Light curves have been analyzed with the standard and the parallax models. Results. We have inferred a configuration inside our galaxy for each event, and therefore a lens mass estimation using a suitable galaxy model. Lens mass determination in some cases shows massive lenses that can be considered black hole candidates. This is the case for the events MACHO-98-BLG-6, and OGLE-00-BUL-43. In our sample only three events do not have enough parallax signal for a successful estimation of the lens mass.

Original languageEnglish
Pages (from-to)157-164
Number of pages8
JournalAstronomy and Astrophysics
Volume466
Issue number1
DOIs
Publication statusPublished - Apr 2007

Keywords

  • Galaxy: stellar content
  • Galaxy: structure
  • Gravitational lensing
  • Stars: kinematics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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