Marianne Heida
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View article: A NuSTAR Study of Quasiperiodic Oscillations from the Ultraluminous X-Ray Sources in M82
A NuSTAR Study of Quasiperiodic Oscillations from the Ultraluminous X-Ray Sources in M82 Open
The study of quasiperiodic oscillations (QPOs) in X-ray binaries provides valuable insights into the physics of accretion around compact objects. The M82 galaxy hosts multiple ultraluminous X-ray sources, including two prominent ones—X-1 a…
View article: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population Open
We present a catalog of hard X-ray serendipitous sources detected in the first 80 months of observations by the Nuclear Spectroscopic Telescope Array (NuSTAR). The NuSTAR serendipitous survey 80 month (NSS80) catalog has an unprecedented ∼…
View article: The NuSTAR Serendipitous Survey: the 80-month catalog and source properties of the high-energy emitting AGN and quasar population
The NuSTAR Serendipitous Survey: the 80-month catalog and source properties of the high-energy emitting AGN and quasar population Open
We present a catalog of hard X-ray serendipitous sources detected in the first 80 months of observations by the Nuclear Spectroscopic Telescope Array (NuSTAR). The NuSTAR serendipitous survey 80-month (NSS80) catalog has an unprecedented $…
View article: Digging a little deeper: characterizing three new extreme ULX candidates
Digging a little deeper: characterizing three new extreme ULX candidates Open
A prime motivation for compiling catalogues of any celestial X-ray source is to increase our numbers of rare subclasses. In this work, we take a recent multimission catalogue of ultraluminous X-ray sources (ULXs) and look for hitherto poor…
View article: A New Sample of Transient Ultraluminous X-Ray Sources Serendipitously Discovered by Swift/XRT
A New Sample of Transient Ultraluminous X-Ray Sources Serendipitously Discovered by Swift/XRT Open
Ultraluminous X-ray sources (ULXs) are our best laboratories for studying extreme super-Eddington accretion. Most studies of these objects are of relatively persistent sources; however, there is growing evidence to suggest a large fraction…
View article: A new sample of transient ultraluminous X-ray sources serendipitously discovered by Swift/XRT
A new sample of transient ultraluminous X-ray sources serendipitously discovered by Swift/XRT Open
Ultraluminous X-ray sources (ULXs) are our best laboratories for studying extreme super-Eddington accretion. Most studies of these objects are of relatively persistent sources, however there is growing evidence to suggest a large fraction …
View article: Orbital Decay in M82 X-2
Orbital Decay in M82 X-2 Open
M82 X-2 is the first pulsating ultraluminous X-ray source discovered. The luminosity of these extreme pulsars, if isotropic, implies an extreme mass transfer rate. An alternative is to assume a much lower mass transfer rate, but with an ap…
View article: First on-sky results of ERIS at VLT
First on-sky results of ERIS at VLT Open
ERIS (Enhanced Resolution Imager and Spectrograph) is a new adaptive optics\ninstrument installed at the Cassegrain focus of the VLT-UT4 telescope at the\nParanal Observatory in Chile. ERIS consists of two near-infrared instruments:\nSPIFF…
View article: The Variability Behavior of NGC 925 ULX-3
The Variability Behavior of NGC 925 ULX-3 Open
We report the results of a 2019–2021 monitoring campaign with Swift and associated target-of-opportunity observations with XMM-Newton and NuSTAR, examining the spectral and timing behavior of the highly variable ultraluminous X-ray source …
View article: BASS. XXII. The BASS DR2 AGN Catalog and Data
BASS. XXII. The BASS DR2 AGN Catalog and Data Open
We present the active galactic nucleus (AGN) catalog and optical spectroscopy for the second data release of the Swift BAT AGN Spectroscopic Survey (BASS DR2). With this DR2 release we provide 1449 optical spectra, of which 1182 are releas…
View article: The Redshift Evolution of Ultraluminous X-Ray Sources out to z ∼ 0.5: Comparison with X-Ray Binary Populations and Contribution to the Cosmic X-Ray Background
The Redshift Evolution of Ultraluminous X-Ray Sources out to z ∼ 0.5: Comparison with X-Ray Binary Populations and Contribution to the Cosmic X-Ray Background Open
Ultraluminous X-ray sources (ULXs) are thought to be powerful X-ray binaries (XRBs) and may contribute significantly to the redshift-dependent X-ray emission from star-forming galaxies. We have assembled a uniform sample of 259 ULXs over t…
View article: The Redshift Evolution of Ultraluminous X-Ray Sources out to z~0.5: Comparison with X-Ray Binary Populations and Contribution to the Cosmic X-Ray Background
The Redshift Evolution of Ultraluminous X-Ray Sources out to z~0.5: Comparison with X-Ray Binary Populations and Contribution to the Cosmic X-Ray Background Open
Ultraluminous X-ray sources (ULXs) are thought to be powerful X-ray binaries (XRBs) and may contribute significantly to the redshift-dependent X-ray emission from star forming galaxies. We have assembled a uniform sample of 259 ULXs over t…
View article: HR 6819 is a binary system with no black hole
HR 6819 is a binary system with no black hole Open
Context. Two scenarios have been proposed to match the existing observational constraints of the object HR 6819. The system could consist of a close inner B-type giant plus a black hole (BH) binary with an additional Be companion in a wide…
View article: Evolution of the Spin, Spectrum and Superorbital Period of the Ultraluminous X-Ray Pulsar M51 ULX7
Evolution of the Spin, Spectrum and Superorbital Period of the Ultraluminous X-Ray Pulsar M51 ULX7 Open
M51 ULX7 is among a small group of known ultraluminous X-ray pulsars (ULXPs). The neutron star powering the source has a spin period of 2.8 s, orbits its companion star with a period of 2 days, and a superorbital period of 38 days is evide…
View article: Orbital decay in M82 X-2
Orbital decay in M82 X-2 Open
M82 X-2 is the first pulsating ultraluminous X-ray source (PULX) discovered. The luminosity of these extreme pulsars, if isotropic, implies an extreme mass transfer rate. An alternative is to assume a much lower mass transfer rate, but wit…
View article: The extreme mass transfer and high magnetic field of the first ultraluminous pulsar M82 X-2.
The extreme mass transfer and high magnetic field of the first ultraluminous pulsar M82 X-2. Open
M82 X-2 is the first pulsating ultraluminous X-ray source (PULX) discovered. The luminosity of these extreme pulsars, if isotropic, implies an extreme mass transfer rate. An alternative is to assume a much lower mass transfer rate, but an …
View article: Science with the Ultraviolet Explorer (UVEX)
Science with the Ultraviolet Explorer (UVEX) Open
UVEX is a proposed medium class Explorer mission designed to provide crucial missing capabilities that will address objectives central to a broad range of modern astrophysics. The UVEX design has two co-aligned wide-field imagers operating…
View article: Long-term pulse period evolution of the ultra-luminous X-ray pulsar NGC 7793 P13
Long-term pulse period evolution of the ultra-luminous X-ray pulsar NGC 7793 P13 Open
Ultra-luminous X-ray pulsars (ULXPs) provide a unique opportunity to study persistent super-Eddington accretion. Here we present the results of a long-term monitoring campaign of ULXP NGC 7793 P13, focusing on the pulse period evolution an…
View article: A new transient ultraluminous X-ray source in NGC 7090
A new transient ultraluminous X-ray source in NGC 7090 Open
We report on the discovery of a new, transient ultraluminous X-ray source (ULX) in the galaxy NGC 7090. This new ULX, which we refer to as NGC 7090 ULX3, was discovered via monitoring with Swift during 2019–2020, and to date has exhibited …
View article: NIR counterparts to ULXs (III): completing the photometric survey and selected spectroscopic results★
NIR counterparts to ULXs (III): completing the photometric survey and selected spectroscopic results★ Open
We present results from the remaining sources in our search for near-infrared (NIR) candidate counterparts to ultraluminous X-ray sources (ULXs) within ≃10 Mpc. We observed 23 ULXs in 15 galaxies and detected NIR candidate counterparts to …
View article: A naked-eye triple system with a nonaccreting black hole in the inner binary
A naked-eye triple system with a nonaccreting black hole in the inner binary Open
Several dozen optical echelle spectra demonstrate that HR 6819 is a hierarchical triple. A classical Be star is in a wide orbit with an unconstrained period around an inner 40 d binary consisting of a B3 III star and an unseen companion in…
View article: The unusual broad-band X-ray spectral variability of NGC 1313 X-1 seen with <i>XMM–Newton, Chandra</i>, and <i>NuSTAR</i>
The unusual broad-band X-ray spectral variability of NGC 1313 X-1 seen with <i>XMM–Newton, Chandra</i>, and <i>NuSTAR</i> Open
We present results from the major coordinated X-ray observing programme on the ULX NGC 1313 X-1 performed in 2017, combining XMM–Newton, Chandra, and NuSTAR, focusing on the evolution of the broad-band (∼0.3–30.0 keV) continuum emission. C…
View article: The (Re)appearance of NGC 925 ULX-3, a New Transient ULX
The (Re)appearance of NGC 925 ULX-3, a New Transient ULX Open
We report the discovery of a third ULX in NGC 925 (ULX-3), detected in 2017 November by Chandra at a luminosity of L X = (7.8 ± 0.8) × 10 39 erg s −1 . Examination of archival data for NGC 925 reveals that ULX-3 was detected by Swift at a …
View article: From SN 2010da to NGC 300 ULX-1: Ten Years of Observations of an Unusual High Mass X-Ray Binary in NGC 300
From SN 2010da to NGC 300 ULX-1: Ten Years of Observations of an Unusual High Mass X-Ray Binary in NGC 300 Open
In May 2010, an intermediate luminosity optical transient was discovered in the nearby galaxy NGC 300 by a South African amateur astronomer. In the decade since its discovery, multi-wavelength observations of the misnamed “SN 2010da” have …
View article: From SN2010da to NGC 300 ULX-1: Ten Years of Observations of an Unusual\n High Mass X-ray Binary in NGC 300
From SN2010da to NGC 300 ULX-1: Ten Years of Observations of an Unusual\n High Mass X-ray Binary in NGC 300 Open
In 2010 May, an intermediate luminosity optical transient was discovered in\nthe nearby galaxy NGC 300 by a South African amateur astronomer. In the decade\nsince its discovery, multi-wavelength observations of the misnamed ``SN\n2010da'' …
View article: Dynamical Confirmation of a Black Hole in MAXI J1820+070
Dynamical Confirmation of a Black Hole in MAXI J1820+070 Open
We present time-resolved 10.4 m Gran Telescopio Canarias and 4.2 m William Herschel Telescope intermediate resolution spectroscopy of the X-ray transient MAXI J1820+070 (=ASASSN-18ey) obtained during its decline to the quiescent state. Cro…
View article: A Broadband Look at the Old and New ULXs of NGC 6946
A Broadband Look at the Old and New ULXs of NGC 6946 Open
Two recent observations of the nearby galaxy NGC 6946 with NuSTAR , one simultaneous with an XMM-Newton observation, provide an opportunity to examine its population of bright accreting sources from a broadband perspective. We study the th…
View article: Discovery and analysis of a ULX nebula in NGC 3521
Discovery and analysis of a ULX nebula in NGC 3521 Open
We present Very Large Telescope/X-shooter and Chandra X-ray observatory/ACIS observations of the ULX [SST2011] J110545.62 + 000016.2 in the galaxy NGC 3521. The source identified as a candidate near-infrared counterpart to the ULX in our p…
View article: Constraining the nature of the accreting binary in CXOGBS J174623.5−310550
Constraining the nature of the accreting binary in CXOGBS J174623.5−310550 Open
We report optical and infrared observations of the X-ray source CXOGBS J174623.5−310550. This Galactic object was identified as a potential quiescent low-mass X-ray binary accreting from an M-type donor on the basis of optical spectroscopy…
View article: Time Domain Studies of Neutron Star and Black Hole Populations: X-ray Identification of Compact Object Types
Time Domain Studies of Neutron Star and Black Hole Populations: X-ray Identification of Compact Object Types Open
What are the most important conditions and processes governing the growth of stellar-origin compact objects? The identification of compact object type as either black hole (BH) or neutron star (NS) is fundamental to understanding their for…