The POINT-AGAPE survey — II. An unrestricted search for microlensing events towards M31
| Autor: | Belokurov, V., An, J., Evans, N. W., Hewett, P., Baillon, P., Novati, S. Calchi, Carr, B. J., Creze, M., Giraud-Heraud, Y., Gould, A., Jetzer, Ph., Kaplan, J., Kerins, E., Paulin-Henriksson, S., Smartt, S. J., Stalin, C. S., Tsapras, Y., Weston, M. J. |
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| Přispěvatelé: | AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AGAPE, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), University of Zurich, Belokurov, V, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
Astrophysics and Astronomy 1912 Space and Planetary Science [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] 530 Physics [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] Astrophysics (astro-ph) 3103 Astronomy and Astrophysics FOS: Physical sciences Astrophysics 142-005 142-005 |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2005, 357, pp.17-37. ⟨10.1111/j.1365-2966.2005.08629.x⟩ Monthly Notices of the Royal Astronomical Society, 2005, 357, pp.17-37. ⟨10.1111/j.1365-2966.2005.08629.x⟩ |
| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.1111/j.1365-2966.2005.08629.x⟩ |
| Popis: | An automated search is carried out for microlensing events using a catalogue of 44554 variable superpixel lightcurves derived from our three-year monitoring program of M31. Each step of our candidate selection is objective and reproducible by a computer. Our search is unrestricted, in the sense that it has no explicit timescale cut. So, it must overcome the awkward problem of distinguishing long-timescale microlensing events from long-period stellar variables. The basis of the selection algorithm is the fitting of the superpixel lightcurves to two different theoretical models, using variable star and blended microlensing templates. Only if microlensing is preferred is an event retained as a possible candidate. Further cuts are made with regard to (i) sampling, (ii) goodness of fit of the peak to a Paczynski curve, (iii) consistency of the microlensing hypothesis with the absence of a resolved source, (iv) achromaticity, (v) position in the colour-magnitude diagram and (vi) signal-to-noise ratio. Our results are reported in terms of first-level candidates, which are the most trustworthy, and second-level candidates, which are possible microlensing but have lower signal-to-noise and are more questionable. The pipeline leaves just 3 first-level candidates, all of which have very short full-width half-maximum timescale ( 22 pages, 18 figures, MNRAS, to appear |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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