Microlensing events in the Galactic bulge. (arXiv:1905.01563v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Navarro_M/0/1/0/all/0/1">Maria Gabriela Navarro</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Minniti_D/0/1/0/all/0/1">Dante Minniti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Capuzzo_Dolcetta_R/0/1/0/all/0/1">Roberto Capuzzo-Dolcetta</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ramos_R/0/1/0/all/0/1">Rodrigo Contreras Ramos</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pullen_J/0/1/0/all/0/1">Joyce Pullen</a>
For the first time we detected microlensing events at zero latitude in the
Galactic bulge using the VISTA Variables in the Via Lactea Survey (VVV) data
2010.9 We have discovered a total sample of N = 630 events within an area
covering 20.7 sq. deg.11,12 Using the near-IR color magnitude diagram we
selected N = 291 red clump sources, allowing us to analyse the longitude
dependence of microlensing across the central region of the Galactic plane. We
thoroughly accounted for the photometric and sampling efficiency. The spatial
distribution is homogeneous, with the number of events smoothly increasing
toward the Galactic center. We find a slight asymmetry, with a larger number of
events toward negative longitudes than positive longitudes, that is possibly
related with the inclination of the bar along the line of sight. We also
examined the timescale distribution which shows a mean on 17.4 +- 1.0 days for
the whole sample, and 20.7 +- 1.0 for the Red Clump subsample.
For the first time we detected microlensing events at zero latitude in the
Galactic bulge using the VISTA Variables in the Via Lactea Survey (VVV) data
2010.9 We have discovered a total sample of N = 630 events within an area
covering 20.7 sq. deg.11,12 Using the near-IR color magnitude diagram we
selected N = 291 red clump sources, allowing us to analyse the longitude
dependence of microlensing across the central region of the Galactic plane. We
thoroughly accounted for the photometric and sampling efficiency. The spatial
distribution is homogeneous, with the number of events smoothly increasing
toward the Galactic center. We find a slight asymmetry, with a larger number of
events toward negative longitudes than positive longitudes, that is possibly
related with the inclination of the bar along the line of sight. We also
examined the timescale distribution which shows a mean on 17.4 +- 1.0 days for
the whole sample, and 20.7 +- 1.0 for the Red Clump subsample.
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