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    title = "The Long-Term Variability of a Population of ULXs Monitored by Chandra",
    journal = "Astronomische Nachrichten",
    year = "2025",
    url = "https://authors.library.caltech.edu/records/atja1-hbp71",
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    doi = "10.1002/asna.20240103",
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    title = "An Intermediate-mass Black Hole Hidden behind Thick Obscuration",
    journal = "Astrophysical Journal",
    year = "2024",
    url = "https://authors.library.caltech.edu/records/883te-dpz27",
    id = "record",
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    doi = "10.3847/1538-4357/ad7f56",
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    title = "Return to the Forgotten Ultraluminous X-Ray Source: A Broadband NICER+NuSTAR Study of NGC 4190 ULX-1",
    journal = "Astrophysical Journal",
    year = "2024",
    url = "https://authors.library.caltech.edu/records/88y42-wcd73",
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    doi = "10.3847/1538-4357/ad43d9",
    volume = "968"
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@article{https://authors.library.caltech.edu/records/qs1n3-0t817,
    title = "Early Hard X-Rays from the Nearby Core-collapse Supernova SN 2023ixf",
    journal = "Astrophysical Journal Letters",
    year = "2023",
    url = "https://authors.library.caltech.edu/records/qs1n3-0t817",
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    issn = "2041-8205",
    doi = "10.3847/2041-8213/acdf4e",
    volume = "952"
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    title = "A New Sample of Transient Ultraluminous X-Ray Sources Serendipitously Discovered by Swift/XRT",
    journal = "Astrophysical Journal",
    year = "2023",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20230717-55375900.15",
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    doi = "10.3847/1538-4357/acd18a",
    volume = "951"
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    title = "Probing the nature of the low state in the extreme ultraluminous X-ray pulsar NGC 5907 ULX1",
    journal = "Astronomy and Astrophysics",
    year = "2023",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20230705-476466000.6",
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    issn = "0004-6361",
    doi = "10.1051/0004-6361/202245048",
    volume = "672"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20221017-15547800.31,
    title = "Orbital Decay in M82 X-2",
    journal = "Astrophysical Journal",
    year = "2022",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20221017-15547800.31",
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    doi = "10.3847/1538-4357/ac8d67",
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    title = "Unveiling the disc structure in ultraluminous X-ray source NGC 55 ULX-1",
    journal = "Monthly Notices of the Royal Astronomical Society",
    year = "2022",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20221007-241666700.1",
    id = "record",
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    doi = "10.1093/mnras/stac2453",
    volume = "516"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20220726-997967000,
    title = "The Variability Behavior of NGC 925 ULX-3",
    journal = "Astrophysical Journal",
    year = "2022",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20220726-997967000",
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    volume = "934"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20220621-436943100,
    title = "Characterization of low light performance of a complementary metal-oxide semiconductor sensor for ultraviolet astronomical applications",
    journal = "Journal of Astronomical Telescopes, Instruments, and Systems",
    year = "2022",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20220621-436943100",
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    issn = "2329-4124",
    doi = "10.1117/1.jatis.8.2.026004",
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20220525-90131000,
    title = "An 8.56 keV Absorption Line in the Hyperluminous X-Ray Source in NGC 4045: Ultrafast Outflow or Cyclotron Line?",
    journal = "Astrophysical Journal",
    year = "2022",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20220525-90131000",
    id = "record",
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    doi = "10.3847/1538-4357/ac5e37",
    volume = "929"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20220124-215321000,
    title = "Evolution of the Spin, Spectrum and Superorbital Period of the Ultraluminous X-Ray Pulsar M51 ULX7",
    journal = "Astrophysical Journal",
    year = "2022",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20220124-215321000",
    id = "record",
    issn = "0004-637X",
    doi = "10.3847/1538-4357/ac3829",
    volume = "925"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20220110-88857600,
    title = "A multimission catalogue of ultraluminous X-ray source candidates",
    journal = "Monthly Notices of the Royal Astronomical Society",
    year = "2022",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20220110-88857600",
    id = "record",
    issn = "0035-8711",
    doi = "10.1093/mnras/stab3001",
    volume = "509"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20220301-900015000,
    title = "Reconstruction of the NuSTAR point spread function using single-laser metrology",
    journal = "Journal of Astronomical Telescopes, Instruments, and Systems",
    year = "2022",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20220301-900015000",
    id = "record",
    issn = "2329-4124",
    doi = "10.1117/1.jatis.8.1.014009",
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20211026-143255024,
    title = "XMM-Newton campaign on the ultraluminous X-ray source NGC 247 ULX-1: outflows",
    journal = "Monthly Notices of the Royal Astronomical Society",
    year = "2021",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20211026-143255024",
    id = "record",
    issn = "0035-8711",
    doi = "10.1093/mnras/stab1648",
    volume = "505"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20210916-140902654,
    title = "Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1",
    journal = "Monthly Notices of the Royal Astronomical Society",
    year = "2021",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20210916-140902654",
    id = "record",
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    doi = "10.1093/mnras/stab1473",
    volume = "505"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20210930-152957940,
    title = "Broadband X-ray spectral variability of the pulsing ULX NGC 1313 X-2",
    journal = "Astronomy and Astrophysics",
    year = "2021",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20210930-152957940",
    id = "record",
    issn = "0004-6361",
    doi = "10.1051/0004-6361/202140884",
    volume = "652"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20210520-150032176,
    title = "Long-term pulse period evolution of the ultra-luminous X-ray pulsar NGC 7793 P13",
    journal = "Astronomy and Astrophysics",
    year = "2021",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20210520-150032176",
    id = "record",
    issn = "0004-6361",
    doi = "10.1051/0004-6361/202140625",
    volume = "651"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20210504-080557186,
    title = "Enhanced X-Ray Emission from the Most Radio-powerful Quasar in the Universe's First Billion Years",
    journal = "Astrophysical Journal",
    year = "2021",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20210504-080557186",
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    volume = "911"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20210308-082954334,
    title = "Chandra Probes the X-Ray Variability of M51 ULX-7: Evidence of Propeller Transition and X-Ray Dips on Orbital Periods",
    journal = "Astrophysical Journal",
    year = "2021",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20210308-082954334",
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    volume = "909"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20210201-140020702,
    title = "A new transient ultraluminous X-ray source in NGC 7090",
    journal = "Monthly Notices of the Royal Astronomical Society",
    year = "2021",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20210201-140020702",
    id = "record",
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    doi = "10.1093/mnras/staa3666",
    volume = "501"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20200414-070245589,
    title = "Swift Monitoring of M51: A 38 day Superorbital Period for the Pulsar ULX7 and a New Transient Ultraluminous X-Ray Source",
    journal = "Astrophysical Journal",
    year = "2020",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200414-070245589",
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    doi = "10.3847/1538-4357/ab7e2a",
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    title = "The unusual broad-band X-ray spectral variability of NGC 1313 X-1 seen with XMM–Newton, Chandra, and NuSTAR",
    journal = "Monthly Notices of the Royal Astronomical Society",
    year = "2020",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200413-153610462",
    id = "record",
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    doi = "10.1093/mnras/staa1129",
    volume = "494"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20190619-080458696,
    title = "Discovery of a 2.8 s Pulsar in a 2 Day Orbit High-mass X-Ray Binary Powering the Ultraluminous X-Ray Source ULX-7 in M51",
    journal = "Astrophysical Journal",
    year = "2020",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20190619-080458696",
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20200316-150528314,
    title = "The (Re)appearance of NGC 925 ULX-3, a New Transient ULX",
    journal = "Astrophysical Journal",
    year = "2020",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200316-150528314",
    id = "record",
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    doi = "10.3847/1538-4357/ab77b8",
    volume = "891"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20200326-143435397,
    title = "XMM-Newton campaign on ultraluminous X-ray source NGC 1313 X-1: wind versus state variability",
    journal = "Monthly Notices of the Royal Astronomical Society",
    year = "2020",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200326-143435397",
    id = "record",
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    doi = "10.1093/mnras/staa118",
    volume = "492"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20200226-134844778,
    title = "The Ultraluminous X-Ray Sources Population of the Galaxy NGC 7456",
    journal = "Astrophysical Journal",
    year = "2020",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200226-134844778",
    id = "record",
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    doi = "10.3847/1538-4357/ab6ffd",
    volume = "890"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20200228-123042359,
    title = "Discovery of a soft X-ray lag in the ultraluminous X-ray source NGC 1313 X-1",
    journal = "Monthly Notices of the Royal Astronomical Society",
    year = "2020",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200228-123042359",
    id = "record",
    issn = "0035-8711",
    doi = "10.1093/mnras/stz3318",
    volume = "491"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20200127-074253356,
    title = "Spectral Evolution of the Ultraluminous X-Ray Sources M82 X-1 and X-2",
    journal = "Astrophysical Journal",
    year = "2020",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200127-074253356",
    id = "record",
    issn = "1538-4357",
    doi = "10.3847/1538-4357/ab629a",
    volume = "889"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20200220-144523449,
    title = "Hunt for Pulsating Ultraluminous X-ray Sources",
    journal = "Monthly Notices of the Royal Astronomical Society",
    year = "2020",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200220-144523449",
    id = "record",
    issn = "0035-8711",
    doi = "10.1093/mnras/stz3036",
    volume = "491"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20190809-141259403,
    title = "The discovery of weak coherent pulsations in the ultraluminous X-ray source NGC 1313 X-2",
    journal = "Monthly Notices of the Royal Astronomical Society: Letters",
    year = "2019",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20190809-141259403",
    id = "record",
    issn = "1745-3925",
    doi = "10.1093/mnrasl/slz086",
    volume = "488"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20190618-153955252,
    title = "A broadband look at the old and new ULXs of NGC 6946",
    journal = "Astrophysical Journal",
    year = "2019",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20190618-153955252",
    id = "record",
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    doi = "10.3847/1538-4357/ab20cd",
    volume = "881"
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    title = "A new, clean catalogue of extragalactic non-nuclear X-ray sources in nearby galaxies",
    journal = "Monthly Notices of the Royal Astronomical Society",
    year = "2019",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20190411-134323381",
    id = "record",
    issn = "0035-8711",
    doi = "10.1093/mnras/sty3403",
    volume = "483"
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    year = "2018",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20181106-105511630",
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    doi = "10.3847/1538-4357/aae1ae",
    volume = "867"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20180516-154831076,
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    year = "2018",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20180516-154831076",
    id = "record",
    issn = "0035-8711",
    doi = "10.1093/mnras/sty501",
    volume = "476"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20160527-110052419,
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    url = "https://resolver.caltech.edu/CaltechAUTHORS:20160527-110052419",
    id = "record",
    issn = "0004-6337",
    doi = "10.1002/asna.201612328",
    volume = "337"
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@article{https://resolver.caltech.edu/CaltechAUTHORS:20160115-064812796,
    title = "A variable ULX and possible IMBH candidate in M51a",
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    year = "2016",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20160115-064812796",
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    issn = "0035-8711",
    doi = "10.1093/mnras/stv2945",
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