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dc.rights.licenseCopyright © 2019, Oxford University Press-
dc.contributor.authorMontanari, F.-
dc.contributor.authorBarrado, D.-
dc.contributor.authorGarcía Bellido, J.-
dc.contributor.otherUnidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737-
dc.contributor.otherCentros de Excelencia Severo Ochoa, INSTITUTO DE FISICA TEORICA (IFT), SEV-2016-0597-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society 490(4): 5647–5657(2019)es
dc.description.abstractScattering events with compact objects are expected in the primordial black hole (PBH) cold dark matter (CDM) scenario, due to close encounters between stars and PBHs in the dense environments of dwarf spheroidals. We develop a Bayesian framework to search for correlations among Milky Way stellar trajectories and those of globular clusters and dwarf galaxies in the halo and in other nearby galaxies. We apply the method to a selection of hypervelocity stars (HVS) and globular clusters from the Gaia DR2 catalogue and known nearby (mostly dwarf) galaxies with full phase-space and size measurements. We report positive evidence for trajectory intersection ∼20–40 Myr ago of up to two stars, depending on priors, with the Sagittarius dwarf spheroidal galaxy (dSph) when assuming the distance estimates of Marchetti, Rossi & Brown (2018). We verify that the result is compatible with their evolutionary status, setting a lower bound for their stellar age of ∼100 Myr. However, such scattering events are not confirmed when assuming Anders et al. (2019) distance estimates. We discuss shortcomings related to present data quality and future prospects for detection of HVS with the full Gaia catalogue and Sagittarius
dc.description.sponsorshipWe acknowledge use of the Hydra cluster at IFT-UAM/CSIC (Madrid). This research made use of ASTROPY,14 a community-developed core PYTHON package for astronomy (Astropy Collaboration et al. 2013, 2018), TOPCAT (Taylor 2005) and STILTS (Taylor 2006). This work has made use of data from the European Space Agency (ESA) mission Gaia ( aia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, rtium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. FM and JGB are supported by the Research Project FPA2015-68048-C3-3-P [MINECO-FEDER] and the Centro de Excelencia Severo Ochoa Program SEV-2016-0597. DB is been funded by the Spanish State Research Agency (AEI) Project No. ESP2017-87676-C5-1-R and No. MDM-2017-0737 Unidad de Excelencia 'Maria de Maeztu' - Centro de Astrobiologia (INTA-CSIC).es
dc.publisherOxford Academics: Oxford University Presses
dc.relationinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2017-87676-C5-1-R-
dc.subjectGalaxy: kinematics and dynamicses
dc.subjectGalaxy: stellar contentes
dc.subjectGalaxies: kinematics and dynamicses
dc.subjectGalaxies: statisticses
dc.subjectDark matteres
dc.titleSearching for correlations in Gaia DR2 unbound star trajectorieses
dc.contributor.orcidBarrado, D. [0000-0002-5971-9242]-
dc.contributor.orcidMontanari, F. [0000-0003-0741-1382]-
dc.contributor.orcidGarcía Bellido, J. [0000-0002-9370-8360]-
dc.contributor.funderAgencia Estatal de Investigación (AEI)-
dc.description.peerreviewedPeer reviewes
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