We search for microlensing events in the zero-latitude area of the Galactic Bulge using the VVV Survey near-IR data. We have discovered a total sample of N = 630 events within an area covering 20.68 deg2 between the years 2010 and 2015. In this paper, we describe the search and present the data for the final sample, including near-IR magnitudes, colors, and proper motions, as well as the standard microlensing parameters. We use the near-IR color-magnitude and color-color diagrams to select N RC = 290 events with red-clump sources to analyze the extinction properties of the sample in the central region of the Galactic plane. The timescale distribution and its dependence in the longitude axis is presented. The mean timescale decreases as we approach the Galactic minor axis (b = 0ˆ). Finally, we give examples of special microlensing events, such as binaries, short-timescale events, and events with a strong parallax effect.

VVV Survey Microlensing: Catalog of Best and Forsaken Events / Navarro Ovando, M. G.; Contreras Ramos, R.; Minniti, D.; Pullen, J.; Capuzzo-Dolcetta, R.; Lucas, P. W.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 893:1(2020), p. 65. [10.3847/1538-4357/ab7a9d]

VVV Survey Microlensing: Catalog of Best and Forsaken Events

Navarro Ovando M. G.;Minniti D.;Capuzzo-Dolcetta R.
Conceptualization
;
2020

Abstract

We search for microlensing events in the zero-latitude area of the Galactic Bulge using the VVV Survey near-IR data. We have discovered a total sample of N = 630 events within an area covering 20.68 deg2 between the years 2010 and 2015. In this paper, we describe the search and present the data for the final sample, including near-IR magnitudes, colors, and proper motions, as well as the standard microlensing parameters. We use the near-IR color-magnitude and color-color diagrams to select N RC = 290 events with red-clump sources to analyze the extinction properties of the sample in the central region of the Galactic plane. The timescale distribution and its dependence in the longitude axis is presented. The mean timescale decreases as we approach the Galactic minor axis (b = 0ˆ). Finally, we give examples of special microlensing events, such as binaries, short-timescale events, and events with a strong parallax effect.
2020
Galaxy bulges; Galactic bulge; Galaxy structure; Gravitational microlensing; Microlensing event rate
01 Pubblicazione su rivista::01a Articolo in rivista
VVV Survey Microlensing: Catalog of Best and Forsaken Events / Navarro Ovando, M. G.; Contreras Ramos, R.; Minniti, D.; Pullen, J.; Capuzzo-Dolcetta, R.; Lucas, P. W.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 893:1(2020), p. 65. [10.3847/1538-4357/ab7a9d]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1403871
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