Microlensing Optical Depth toward the Galactic Bulge from Microlensing Observations in Astrophysics Group Observations during 2000 with Difference Image Analysis | Zendy

T. Sumi | Zendy; F. Abe | Zendy; I. A. Bond | Zendy; R. J. Dodd | Zendy; J. B. Hearnshaw | Zendy; Mitsuhiko Honda | Zendy; Mareki Honma | Zendy; Yukitoshi Kanya | Zendy; P. M. Kilmartin | Zendy; K. Masuda | Zendy; Y. Matsubara | Zendy; Y. Muraki | Zendy; T. Nakamura | Zendy; Ryosuke Nishi | Zendy; S. Noda | Zendy; Kei Ohnishi | Zendy; O. K. L. Petterson | Zendy; Nicholas J. Rattenbury | Zendy; M. Reid | Zendy; To. Saito | Zendy; Y. Saito | Zendy; H. Sato | Zendy; M. Sekiguchi | Zendy; J. Skuljan | Zendy; D. J. Sullivan | Zendy; M. Takeuti | Zendy; P. J. Tristram | Zendy; S. Wilkinson | Zendy; Tatsuya Yanagisawa | Zendy; P. C. M. Yock | Zendy

Open Access

Microlensing Optical Depth toward the Galactic Bulge from Microlensing Observations in Astrophysics Group Observations during 2000 with Difference Image Analysis

Author(s) -

T. Sumi,

F. Abe,

I. A. Bond,

R. J. Dodd,

J. B. Hearnshaw,

Mitsuhiko Honda,

Mareki Honma,

Yukitoshi Kanya,

P. M. Kilmartin,

K. Masuda,

Y. Matsubara,

Y. Muraki,

T. Nakamura,

Ryosuke Nishi,

S. Noda,

Kei Ohnishi,

O. K. L. Petterson,

Nicholas J. Rattenbury,

M. Reid,

To. Saito,

Y. Saito,

H. Sato,

M. Sekiguchi,

J. Skuljan,

D. J. Sullivan,

M. Takeuti,

P. J. Tristram,

S. Wilkinson,

Tatsuya Yanagisawa,

P. C. M. Yock

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/375212

Subject(s) - gravitational microlensing , bulge , physics , astrophysics , stars , gravitational lens , optical depth , extinction (optical mineralogy) , light curve , astronomy , galaxy , optics , aerosol , redshift , meteorology

We analyze the data of the gravitational microlensing survey carried out byby the MOA group during 2000 towards the Galactic Bulge (GB). Our observationsare designed to detect efficiently high magnification events with faint sourcestars and short timescale events, by increasing the the sampling rate up to 6times per night and using Difference Image Analysis (DIA). We detect 28microlensing candidates in 12 GB fields corresponding to 16 deg^2. We use MonteCarlo simulations to estimate our microlensing event detection efficiency,where we construct the I-band extinction map of our GB fields in order to finddereddened magnitudes. We find a systematic bias and large uncertainty in themeasured value of the timescale $t_{\rm Eout}$ in our simulations. They areassociated with blending and unresolved sources, and are allowed for in ourmeasurements. We compute an optical depth tau = 2.59_{-0.64}^{+0.84} \times10^{-6} towards the GB for events with timescales 0.310). These events areuseful for studies of extra-solar planets.Comment: 65 pages and 30 figures, accepted for publication in ApJ. A systematic bias and uncertainty in the optical depth measurement has been quantified by simulation

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