The Optical Gravitational Lensing Experiment. Catalog of Microlensing Events in the Galactic Bulge

• Autorzy: Udalski A. , Żebruń K. , Szymański M. , Kubiak M. , Pietrzyński G. , Soszyński I. , Woźniak P.
• Języki publikacji: EN

Abstrakty

EN

We present the Catalog of microlensing events detected toward the Galactic bulge in three observing seasons, 1997-1999, during the OGLE-II microlensing survey. The search for microlensing events was performed using a database of about 4×109 photometric measurements of about 20.5 million stars from the Galactic bulge. The Catalog comprises 214 microlensing events found in the fields covering about 11 square degrees on the sky and distributed in different parts of the Galactic bulge. The sample includes 20 binary microlensing events, 14 of them are caustic crossing. In one case a double star is likely lensed. We present distribution of the basic parameters of microlensing events and show preliminary rate of microlensing in different regions of the Galactic bulge. The latter reveals clear dependence on the Galactic coordinates. The dependence on l indicates that the majority of lenses toward the Galactic bulge are located in the Galactic bar. Models of the Galactic bar seem to reasonably predict the observed spatial distribution of microlensing events in the Galactic bulge. All data presented in the Catalog and photometry of all events are available from the OGLE Internet archive.

Słowa kluczowe

EN

gravitational lensing; dark matter; galaxy: center; galaxy: structure; catalog; survey

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2000
• Tom: Vol. 50, No. 1
• Strony: 1--65
• Opis fizyczny: Bibliogr. 33 poz., rys., tab., wykr.

Twórcy

autor

Udalski A.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Żebruń K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Szymański M.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Kubiak M.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Pietrzyński G.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Soszyński I.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Woźniak P.

• Princeton University Observatory, Princeton, NJ 08544-1001, USA

Bibliografia

• Albrow, M.D. et al. 1998, Astrophys. J., 509, 687.
• Albrow, M.D. et al. 2000a, Astrophys. J., in press (astro-ph/9909325).
• Albrow, M.D. et al. 2000b, Astrophys. J., in press (astro-ph/9910307).
• Alcock, C. et al. 1993, Nature, 365, 621.
• Alcock, C. et al. 1995a, Astrophys. J., 445, 133.
• Alcock, C. et al. 1995b, Astrophys. J. Letters, 454, L125.
• Alcock, C. et al. 1996a, Astrophys. J., 461, 84.
• Alcock, C. et al. 1996b, Astrophys. J. Letters, 463, L67.
• Alcock, C. et al. 1997a, Astrophys. J., 479, 119.
• Alcock, C. et al. 1997b, Astrophys. J. Letters, 491, L11.
• Alcock, C. et al. 1999, Astrophys. J., submitted (astro-ph/9907369).
• Aubourg, E. et al. 1993, Nature, 365, 623.
• Bennett, D.P. et al. 1999a, Nature, 402, 57.
• Bennett, D.P. et al. 1999b, AAS, 195, 3707.
• Derue, F. et al. 1999, Astron. Astrophys., 351, 87.
• Evans, N.W. 1994, Astrophys. J. Letters, 1994, L31.
• Grenacher, L., Jetzer, P., Strässle, M, and De Paolis, F. 1999, Astron. Astrophys., 351, 775.
• Kiraga, M. 1994, Acta Astron., 365, 621.
• Mao, S. 1999, Astron. Astrophys., 350, L19.
• Mao, S., and Paczyński, B. 1991, Astrophys. J. Letters, 374, L37.
• Paczyński, B. 1986, Astrophys. J., 304, 1.
• Paczyński, B. 1991, Astrophys. J. Letters, 371, L63.
• Paczyński, B. 1996, Ann. Rev. Astron. Astrophys., 34, 419.
• Rhie, S.H., Becker, A.C., Bennett, D.P., Fragile, P.C., Johnson, B.R., King, L.J., Peterson, B.A., and Quinn, J. 1999, Astrophys. J., 522, 1037.
• Stanek, K.Z., Udalski, A., Szymański, M., Kałużny, J., Kubiak, M., Mateo, M., and Krzemiński, W. 1997, Astrophys. J., 477, 163.
• Udalski, A., Szymański, M., Kałużny, J., Kubiak, M., Krzemiński, W., Mateo, M. Preston, G., and Paczyński, B. 1993, Acta Astron., 43, 289.
• Udalski, A., Szymański, M., Kałużny, J., Kubiak, M., Mateo, M. and Krzemiński, W. 1994a, Astrophys. J. Letters, 426, L69.
• Udalski, A., Szymański, M., Mao, S., Di Stefano, R., Kałużnym, J., Kubiak, M., Mateo, M., and Krzemiński, 1994b, Astrophys. J. Letters, 436, L103.
• Udalski, A., Szymański, M., Stanek, K.Z., Kałużny, J., Kubiak, M., Mateo, M. Krzemiński, W., Paczyński, B., and Venkat, R. 1994c, Acta Astron., 44, 165.
• Udalski, A., Szymański, M., Kałużny, J., Kubiak, M., Mateo, M. Krzemiński, W., and Paczyński, B. 1994d, Acta Astron., 44, 227.
• Udalski, A., Kubiak, M., and Szymański, M. 1997, Acta Astron., 47, 319.
• Udalski, A., Szymański, M., Kubiak, M.,Pietrzyński, G., Woźniak, P., and Żerbuń, K. 1998b, Acta Astron., 48, 147.
• Zhao, H.S., and Mao, S. 1996, MNRAS, 283, 1197.