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Disentangling the Black Hole Mass Spectrum with Photometric Microlensing Surveys

dc.contributor.authorScott E. Perkins
dc.contributor.authorPeter McGill
dc.contributor.authorWilliam Dawson
dc.contributor.authorNatasha S. Abrams
dc.contributor.authorCasey Y. Lam
dc.contributor.authorMing-Feng Ho
dc.contributor.authorJessica R. Lu
dc.contributor.authorSimeon Bird
dc.contributor.authorKerianne Pruett
dc.contributor.authorNathan Golovich
dc.contributor.authorGeorge Chapline
dc.contributor.otherLawrence Livermore National Laboratory , 7000 East Ave., Livermore, CA 94550 USA ; perkins35@llnl.gov
dc.contributor.otherLawrence Livermore National Laboratory , 7000 East Ave., Livermore, CA 94550 USA ; perkins35@llnl.gov
dc.contributor.otherLawrence Livermore National Laboratory , 7000 East Ave., Livermore, CA 94550 USA ; perkins35@llnl.gov
dc.contributor.otherDepartment of Astronomy, University of California , Berkeley, Berkeley, CA 94720, USA
dc.contributor.otherDepartment of Astronomy, University of California , Berkeley, Berkeley, CA 94720, USA; Observatories of the Carnegie Institution for Science , Pasadena, CA 91101, USA
dc.contributor.otherDepartment of Physics and Astronomy, University of California , Riverside, CA 92521, USA
dc.contributor.otherDepartment of Astronomy, University of California , Berkeley, Berkeley, CA 94720, USA
dc.contributor.otherDepartment of Physics and Astronomy, University of California , Riverside, CA 92521, USA
dc.contributor.otherLawrence Livermore National Laboratory , 7000 East Ave., Livermore, CA 94550 USA ; perkins35@llnl.gov
dc.contributor.otherLawrence Livermore National Laboratory , 7000 East Ave., Livermore, CA 94550 USA ; perkins35@llnl.gov
dc.contributor.otherLawrence Livermore National Laboratory , 7000 East Ave., Livermore, CA 94550 USA ; perkins35@llnl.gov
dc.date.accessioned2024-01-24T13:44:36Z
dc.date.accessioned2025-10-08T08:52:25Z
dc.date.available2025-10-08T08:52:25Z
dc.date.issued01-01-2024
dc.identifier.urihttp://digilib.fisipol.ugm.ac.id/repo/handle/15717717/37837
dc.description.abstractFrom the formation mechanisms of stars and compact objects to nuclear physics, modern astronomy frequently leverages surveys to understand populations of objects to answer fundamental questions. The population of dark and isolated compact objects in the Galaxy contains critical information related to many of these topics, but is only practically accessible via gravitational microlensing. However, photometric microlensing observables are degenerate for different types of lenses, and one can seldom classify an event as involving either a compact object or stellar lens on its own. To address this difficulty, we apply a Bayesian framework that treats lens type probabilistically and jointly with a lens population model. This method allows lens population characteristics to be inferred despite intrinsic uncertainty in the lens class of any single event. We investigate this method’s effectiveness on a simulated ground-based photometric survey in the context of characterizing a hypothetical population of primordial black holes (PBHs) with an average mass of 30 M _⊙ . On simulated data, our method outperforms current black hole (BH) lens identification pipelines and characterizes different subpopulations of lenses while jointly constraining the PBH contribution to dark matter to ≈25%. Key to robust inference, our method can marginalize over population model uncertainty. We find the lower mass cutoff for stellar origin BHs, a key observable in understanding the BH mass gap, particularly difficult to infer in our simulations. This work lays the foundation for cutting-edge PBH abundance constraints to be extracted from current photometric microlensing surveys.
dc.language.isoEN
dc.publisherIOP Publishing
dc.subject.lccAstrophysics
dc.titleDisentangling the Black Hole Mass Spectrum with Photometric Microlensing Surveys
dc.typeArticle
dc.description.keywordsGravitational microlensing
dc.description.keywordsMicrolensing parallax
dc.description.keywordsDark matter
dc.description.keywordsPrimordial black holes
dc.description.keywordsBlack holes
dc.description.keywordsAstrophysical black holes
dc.description.doi10.3847/1538-4357/ad09bf
dc.title.journalThe Astrophysical Journal
dc.identifier.e-issn1538-4357
dc.identifier.oaioai:doaj.org/journal:b1c62e271f5e47aca274572f6e1272ec
dc.journal.infoVolume 961, Issue 2


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