First characterization of a new high-mass X-ray binary in LMC eRASSU J050810.4−660653 with SRG/ART-XC, NuSTAR, and Swift

Salganik, Alexander; Tsygankov, Sergey S.; Lutovinov, A.; Mushtukov, Alexander A.; Mereminskiy, I. A.; Molkov, S.; Semena, A.

doi:10.1093/mnras/stac1608

Cited by 4 publications

(4 citation statements)

References 45 publications

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“…The source became brightest at the end of eRASS4/beginning of eRASS5 when it was detected by Mikhail Pavlinsky ART-XC (Pavlinsky et al 2021), the hard X-ray instrument on board SRG. A NuS-TAR observation independently revealed the pulsations of eRASSU J050810.4-660653 (Salganik et al 2022).…”

Section: Introductionmentioning

confidence: 98%

“…The first scans were performed during a test phase (named eRASS0) before the official start of the all-sky survey (MJD 58828) with eRASS1 and then around the formal transitions of eRASS1-eRASS2, eRASS2-eRASS3, eRASS3-eRASS4, and eRASS4-eRASS5. The red and green dashed lines mark the beginning of the XMM-Newton and NuSTAR observations(Salganik et al 2022;Haberl et al 2021), respectively.…”

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confidence: 99%

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SRG/eROSITA-triggered XMM-Newton observations of three Be/X-ray binaries in the LMC: Discovery of X-ray pulsations

Haberl

Maitra

Kaltenbrunner

et al. 2023

A&A

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Context. Using data from eROSITA, the soft X-ray instrument aboard Spectrum-Roentgen-Gamma (SRG), we report the discovery of two new hard transients, eRASSU J050810.4–660653 and eRASSt J044811.1–691318, in the Large Magellanic Cloud. We also report the detection of the Be/X-ray binary RX J0501.6–7034 in a bright state. Aims. We initiated follow-up observations to investigate the nature of the new transients and to search for X-ray pulsations coming from RX J0501.6–7034. Methods. We analysed the X-ray spectra and light curves from our XMM-Newton observations, obtained optical spectra using the South African Large Telescope to look for Balmer emission lines and utilised the archival data from the Optical Gravitational Lensing Experiment (OGLE) for the long-term monitoring of the optical counterparts. Results. We find X-ray pulsations for eRASSU J050810.4–660653, RX J0501.6–7034, and eRASSt J044811.1–691318 of 40.6 s, 17.3 s, and 784 s, respectively. The Hα emission lines with equivalent widths of −10.4 Å (eRASSU J050810.4–660653) and −43.9 Å (eRASSt J044811.1–691318) were measured, characteristic for a circumstellar disc around Be stars. The OGLE I- and V-band light curves of all three systems exhibit strong variability. A regular pattern of deep dips in the light curves of RX J0501.6–7034 suggests an orbital period of ∼451 days. Conclusions. We identify the two new hard eROSITA transients eRASSU J050810.4–660653 and eRASSt J044811.1–691318 and the known Be/X-ray binary RX J0501.6–7034 as Be/X-ray binary pulsars.

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Section: Introductionmentioning

confidence: 98%

mentioning

confidence: 99%

SRG/eROSITA-triggered XMM-Newton observations of three Be/X-ray binaries in the LMC: Discovery of X-ray pulsations

Haberl

Maitra

Kaltenbrunner

et al. 2023

A&A

View full text Add to dashboard Cite

show abstract

“…The source became brightest at the end of eRASS4/beginning of eRASS5 when it was detected by Mikhail Pavlinsky ART-XC (Pavlinsky et al 2021), the hard X-ray instrument on board SRG. A NuSTAR observation independently revealed the pulsations of eRASSU J050810.4−660653 (Salganik et al 2022).…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

SRG/eROSITA-triggered XMM-Newton observations of three Be/X-ray binaries in the LMC: Discovery of X-ray pulsations

Haberl,

Maitra,

Kaltenbrunner

et al. 2023

Preprint

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Context. Using data from eROSITA, the soft X-ray instrument aboard Spectrum-Roentgen-Gamma (SRG), we report the discovery of two new hard transients, eRASSU J050810.4−660653 and eRASSt J044811.1−691318, in the Large Magellanic Cloud. We also report the detection of the Be/X-ray binary RX J0501.6−7034 in a bright state. Aims. We initiated follow-up observations to investigate the nature of the new transients and to search for X-ray pulsations coming from RX J0501.6−7034. Methods. We analysed the X-ray spectra and light curves from our XMM-Newton observations, obtained optical spectra using the South African Large Telescope to look for Balmer emission lines and utilised the archival data from the Optical Gravitational Lensing Experiment (OGLE) for the long-term monitoring of the optical counterparts. Results. We find X-ray pulsations for eRASSU J050810.4−660653, RX J0501.6−7034, and eRASSt J044811.1−691318 of 40.6 s, 17.3 s, and 784 s, respectively. The Hα emission lines with equivalent widths of -10.4 Å (eRASSU J050810.4−660653) and -43.9 Å (eRASSt J044811.1−691318) were measured, characteristic for a circumstellar disc around Be stars. The OGLE I-and V-band light curves of all three systems exhibit strong variability. A regular pattern of deep dips in the light curves of RX J0501.6−7034 suggests an orbital period of ∼451 days. Conclusions. We identify the two new hard eROSITA transients eRASSU J050810.4−660653 and eRASSt J044811.1−691318 and the known Be/X-ray binary RX J0501.6−7034 as Be/X-ray binary pulsars.

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RX J0440.9+4431: another supercritical X-ray pulsar

Salganik

Tsygankov

Doroshenko

et al. 2023

Monthly Notices of the Royal Astronomical Society

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In the beginning of 2023 the Be transient X-ray pulsar RX J0440.9+4431 underwent a first-ever giant outburst observed from the source peaking in the beginning of February and reaching peak luminosity of ≈4.3 × 1037 erg s−1. Here we present the results of a detailed spectral and temporal study of the source based on NuSTAR, Swift, INTEGRAL and NICER observations performed during this period and covering wide range of energies and luminosities. We find that both the pulse profile shape and spectral hardness change abruptly around ≈2.8 × 1037 erg s−1, which we associate with a transition to supercritical accretion regime and erection of the accretion column. The observed pulsed fraction decreases gradually with energy up to 20 keV (with a local minimum around fluorescence iron line), which is unusual for an X-ray pulsar, and then rises rapidly at higher energies with the pulsations significantly detected up to ≈120 keV. The broadband energy spectra of RX J0440.9+4431 at different luminosity states can be approximated with a two-hump model with peaks at energies of about 10–20 and 50–70 keV previously suggested for other pulsars without additional features. In particular an absorption feature around 30 keV previously reported and interpreted as a cyclotron line in the literature appears to be absent when using this model, so the question regarding the magnetic field strength of the neutron star remains open. Instead, we attempted to estimate field using several indirect methods and conclude that all of them point to a relatively strong field of around B ∼ 1013 G.

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First characterization of a new high-mass X-ray binary in LMC eRASSU J050810.4−660653 with SRG/ART-XC, NuSTAR, and Swift

Cited by 4 publications

References 45 publications

SRG/eROSITA-triggered XMM-Newton observations of three Be/X-ray binaries in the LMC: Discovery of X-ray pulsations

SRG/eROSITA-triggered XMM-Newton observations of three Be/X-ray binaries in the LMC: Discovery of X-ray pulsations

SRG/eROSITA-triggered XMM-Newton observations of three Be/X-ray binaries in the LMC: Discovery of X-ray pulsations

RX J0440.9+4431: another supercritical X-ray pulsar

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