The OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC data

We present the results from the OGLE-II survey (1996-2000) towards the Large Magellanic Cloud (LMC), which has the aim of detecting the microlensing phenomena caused by dark matter compact objects in the Galactic Halo (Machos). We use high resolution HST images of the OGLE fields and derive the corr...

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Detalles Bibliográficos
Autores: Wyrzykowski, A ., Pietrzynski, G., Szewczyk, O.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2009
País:Chile
Idioma:inglés
OAI Identifier:oai:repositorio.anid.cl:10533/237046
Acceso en línea:https://hdl.handle.net/10533/237046
Access Level:acceso abierto
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spelling Szewczyk, O.Pietrzynski, G.Wyrzykowski, A .200910.1111/j.1365-2966.2009.15029.xhttps://hdl.handle.net/10533/237046http://purl.org/coar/access_right/c_abf2The OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC dataWyrzykowski, A .Pietrzynski, G.Szewczyk, O.2019-12-18T18:14:38Z2022-07-07T22:01:58Z2019-12-18T18:14:38Z2022-07-07T22:01:58Z2009We present the results from the OGLE-II survey (1996-2000) towards the Large Magellanic Cloud (LMC), which has the aim of detecting the microlensing phenomena caused by dark matter compact objects in the Galactic Halo (Machos). We use high resolution HST images of the OGLE fields and derive the correction for the number of monitored stars in each field. This also yield blending distributions which we use in 'catalogue level' Monte Carlo simulations of the microlensing events in order to calculate the detection efficiency of the events. We detect two candidates for microlensing events in the All Stars Sample, which translates into an optical depth of 0.43+-0.33x 10e-7. If both events were due to Macho the fraction of mass of compact dark matter objects in the Galactic halo would be 8+-6 per cent. This optical depth, however, along with the characteristics of the events, seems to be consistent with the self-lensing scenario, i.e., self-lensing alone is sufficient to explain the observed microlensing signal. Our results indicate a non-detection of Machos lensing towards the LMC with an upper limit on their abundance in the Galactic halo of 19 per cent for M=0.4 Msun and 10 per cent for masses between 0.01 and 0.2 Msun.FONDAPFONDAP1501000315010003virtual::27140-1WOS:000268459900006https://hdl.handle.net/10533/237046enginstname: Conicytreponame: Repositorio Digital RI2.010.1111/j.1365-2966.2009.15029.xinfo:eu-repo/grantAgreement/Fondap/15010003https://arxiv.org/abs/0905.2044Atribución-NoComercial-SinDerivadas 3.0 Chilehttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/info:eu-repo/semantics/openAccessThe OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC dataMonthly Notices Of The Royal Astronomical SocietyArticuloinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttps://hdl.handle.net/10533/237046http://purl.org/coar/resource_type/c_2df8fbb1045fc0e1-ef55-4532-8afe-69fe789d964dvirtual::27140-1045fc0e1-ef55-4532-8afe-69fe789d964dvirtual::27140-110533/237046oai:repositorio.anid.cl:10533/2370462023-07-24 21:06:12.687https://repositorio.anid.clRepositorio ANIDaletelier@anid.cl
dc.title.none.fl_str_mv The OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC data
dc.title.journal.none.fl_str_mv Monthly Notices Of The Royal Astronomical Society
title The OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC data
spellingShingle The OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC data
Wyrzykowski, A .
title_short The OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC data
title_full The OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC data
title_fullStr The OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC data
title_full_unstemmed The OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC data
title_sort The OGLE view of microlensing towards the Magellanic Clouds - I. A trickle of events in the OGLE-II LMC data
dc.creator.none.fl_str_mv Wyrzykowski, A .
Pietrzynski, G.
Szewczyk, O.
author Wyrzykowski, A .
author_facet Wyrzykowski, A .
Pietrzynski, G.
Szewczyk, O.
author_role author
author2 Pietrzynski, G.
Szewczyk, O.
author2_role author
author
description We present the results from the OGLE-II survey (1996-2000) towards the Large Magellanic Cloud (LMC), which has the aim of detecting the microlensing phenomena caused by dark matter compact objects in the Galactic Halo (Machos). We use high resolution HST images of the OGLE fields and derive the correction for the number of monitored stars in each field. This also yield blending distributions which we use in 'catalogue level' Monte Carlo simulations of the microlensing events in order to calculate the detection efficiency of the events. We detect two candidates for microlensing events in the All Stars Sample, which translates into an optical depth of 0.43+-0.33x 10e-7. If both events were due to Macho the fraction of mass of compact dark matter objects in the Galactic halo would be 8+-6 per cent. This optical depth, however, along with the characteristics of the events, seems to be consistent with the self-lensing scenario, i.e., self-lensing alone is sufficient to explain the observed microlensing signal. Our results indicate a non-detection of Machos lensing towards the LMC with an upper limit on their abundance in the Galactic halo of 19 per cent for M=0.4 Msun and 10 per cent for masses between 0.01 and 0.2 Msun.
publishDate 2009
dc.date.issued.none.fl_str_mv 2009
dc.date.accessioned.none.fl_str_mv 2019-12-18T18:14:38Z
2022-07-07T22:01:58Z
dc.date.available.none.fl_str_mv 2019-12-18T18:14:38Z
2022-07-07T22:01:58Z
dc.type.none.fl_str_mv Articulo
dc.type.driver.none.fl_str_mv info:eu-repo/semantics/article
dc.type.openaire.none.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.folio.none.fl_str_mv 15010003
15010003
dc.identifier.idwos.none.fl_str_mv WOS:000268459900006
dc.identifier.uri.none.fl_str_mv https://hdl.handle.net/10533/237046
identifier_str_mv 15010003
WOS:000268459900006
url https://hdl.handle.net/10533/237046
dc.language.iso.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv instname: Conicyt
reponame: Repositorio Digital RI2.0
dc.relation.doi.none.fl_str_mv 10.1111/j.1365-2966.2009.15029.x
dc.relation.projectid.none.fl_str_mv info:eu-repo/grantAgreement/Fondap/15010003
dc.relation.uri.none.fl_str_mv https://arxiv.org/abs/0905.2044
dc.rights.none.fl_str_mv Atribución-NoComercial-SinDerivadas 3.0 Chile
http://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.rights.driver.none.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv Atribución-NoComercial-SinDerivadas 3.0 Chile
http://creativecommons.org/licenses/by-nc-nd/3.0/cl/
eu_rights_str_mv openAccess
repository.name.fl_str_mv Repositorio ANID
repository.mail.fl_str_mv aletelier@anid.cl
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score 15,812429

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