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Neutron Stars and Black Holes in the Small Magellanic Cloud: The SMC NuSTAR Legacy Survey

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dc.abstract.enWe present a source catalog from the first deep hard X-ray (E > 10 keV) survey of the Small Magellanic Cloud (SMC), the Nuclear Spectroscopic Telescope Array (NuSTAR) Legacy Survey of the SMC. We observed three fields, for a total exposure time of 1 Ms, along the bar of this nearby star-forming galaxy. Fields were chosen for their young stellar and accreting binary populations. We detected 10 sources above a 3σ significance level (4-25 keV) and obtained upper limits on an additional 40 sources. We reached a 3σ limiting luminosity in the 4-25 keV band of ˜10<SUP>35</SUP> erg s<SUP>-1</SUP>, allowing us to probe fainter X-ray binary (XRB) populations than has been possible with other extragalactic NuSTAR surveys. We used hard X-ray colors and luminosities to constrain the compact-object type, exploiting the spectral differences between accreting black holes and neutron stars at E > 10 keV. Several of our sources demonstrate variability consistent with previously observed behavior. We confirmed pulsations for seven pulsars in our 3σ sample. We present the first detection of pulsations from a Be-XRB, SXP 305 (CXO J005215.4-73191), with an X-ray pulse period of 305.69 ± 0.16 s and a likely orbital period of ˜1160-1180 days. Bright sources (≳5 × 10<SUP>36</SUP> erg s<SUP>-1</SUP>) in our sample have compact-object classifications consistent with their previously reported types in the literature. Lower-luminosity sources (≲5 × 10<SUP>36</SUP> erg s<SUP>-1</SUP>) have X-ray colors and luminosities consistent with multiple classifications. We raise questions about possible spectral differences at low luminosity between SMC pulsars and the Galactic pulsars used to create the diagnostic diagrams.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorLazzarini, M.
dc.contributor.authorWilliams, B. F.
dc.contributor.authorHornschemeier, A. E.
dc.contributor.authorAntoniou, V.
dc.contributor.authorVasilopoulos, G.
dc.contributor.authorHaberl, F.
dc.contributor.authorVulic, N.
dc.contributor.authorYukita, M.
dc.contributor.authorZezas, A.
dc.contributor.authorBodaghee, A.
dc.contributor.authorLehmer, B. D.
dc.contributor.authorMaccarone, T. J.
dc.contributor.authorPtak, A.
dc.contributor.authorWik, D.
dc.contributor.authorFornasini, F. M.
dc.contributor.authorHong, Jaesub
dc.contributor.authorKennea, J. A.
dc.contributor.authorTomsick, J. A.
dc.contributor.authorVenters, T.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorCassity, A.
dc.date.accessioned2024-01-25T13:47:19Z
dc.date.available2024-01-25T13:47:19Z
dc.date.copyright2019-09-24
dc.date.issued2019
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume884
dc.identifier.doi10.3847/1538-4357/AB3F32
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/113534
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2019ApJ...884....2L
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages2
dc.rightsOther
dc.sciencecloudnosend
dc.titleNeutron Stars and Black Holes in the Small Magellanic Cloud: The SMC NuSTAR Legacy Survey
dc.typeJournalArticle
dspace.entity.typePublication