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Statistical improvement in detection level of gravitational microlensing events from their light curves

Research in Astronomy and Astrophysics 2018年第4期18卷 43-58页

作者： Ichsan Ibrahim hakim l.malasan Chatief Kunjaya Anton Timur Jaelani Gerhana Puannandra Putri Mitra Djamal Department of Astronomy Institute of Technology Bandung Bandung Indonesia Department of Physics Department of Astronomy Institute of Technology Bandung Bandung Indonesia Bosscha Astronomical Observatory Department of Astronomy Institute of Technology Bandung LembangIndonesia Department of Informatics STMIK-Indonesia Mandiri Bandung Indonesia Universitas Ma Chung Malang Indonesia Faculty of Shariah Institut Agama Islam Ternate Ternate North Molucca Indonesia Astronomical Institute Tohoku University Sendai Japan

In astronomy,the brightness of a source is typically expressed in terms of ***,the magnitude is defined by the logarithm of received *** relationship is known as the Pogson *** received flux with a small signal to noise ratio（S/N）,however,the formula gives a large magnitude *** investigate whether the use of Inverse Hyperbolic Sine function（hereafter referred to as the Asinh magnitude）in the modified formulae could allow for an alternative calculation of magnitudes for small S/N flux,and whether the new approach is better for representing the brightness of that *** study the possibility of increasing the detection level of gravitational microlensing using 40 selected microlensing light curves from the 2013 and 2014 seasons and by using the Asinh *** data of the selected events are obtained from the Optical Gravitational lensing Experiment（OGlE）.We found that utilization of the Asinh magnitude makes the events brighter compared to using the logarithmic magnitude,with an average of about 3.42×10^（-2）magnitude and an average in the difference of error between the logarithmic and the Asinh magnitude of about 2.21×10（-2）*** microlensing events OB140847 and OB140885 are found to have the largest difference values among the selected *** a Gaussian fit to find the peak for OB140847 and OB140885,we conclude statistically that the Asinh magnitude gives better mean squared values of the regression and narrower residual histograms than the Pogson *** on these results,we also attempt to propose a limit in magnitude value for which use of the Asinh magnitude is optimal with small S/N data.

关键词： gravitational lensing micro — methods data analysis

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