Detection of a 23.6 min periodic modulation in the optical counterpart of 3XMMJ051034.6–670353

Ramsay, Gavin; Marsh, T. R.; Kupfer, Thomas; Dhillon, V. S.; Steeghs, D.; Woudt, P. A.; Groot, P.

doi:10.1051/0004-6361/201833305

Cited by 3 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For an LMC distance, this system exhibits a luminosity of around 5 × 10 34 erg s −1 and a radius for the emitting area of ∼180 km. The detection of a 23.6 min periodic modulation in the optical and identification of the optical counterpart confirms a location of the binary system in our Galaxy (Ramsay et al 2018).…”

Section: New Galactic Magnetic Cataclysmic Variablessupporting

confidence: 82%

Discovery of four super-soft X-ray sources in XMM-Newton observations of the Large Magellanic Cloud

Maitra

Haberl

2021

A&A

View full text Add to dashboard Cite

Context. Super-soft X-ray sources were established as a heterogeneous class of objects from observations of the Large Magellanic Cloud (LMC). Aims. We have searched for new sources of this class in the X-ray images obtained from the XMM-Newton survey of the LMC and additional archival observations. Methods. We first selected candidates by visual inspection of the image and screened out the artefacts that can mimic super-soft X-ray sources as well as the bright foreground stars that create optical loading in the detectors. We obtained four new super-soft X-ray sources for which we performed detailed X-ray timing and spectral analyses and searched for possible optical counterparts to identify their nature. We also looked at archival ROSAT and Swift observations to investigate the long-term behaviour of the sources. Results. XMMU J050452.0−683909 is identified as the central star of the planetary nebula SMP LMC 21 in the LMC. We suggest XMMU J051854.8−695601 and XMMU J050815.1−691832 as new soft intermediate polars based on the nature of their X-ray spectrum. Their estimated absorption-corrected luminosities and the blackbody radii indicate that they are located in our Galaxy, rather than the LMC. We discovered coherent pulsations of 497 s from XMMU J044626.6-692011, which indicates a magnetic cataclysmic variable nature of the source. The location of XMMU J044626.6−692011 in the LMC or our Galaxy is less clear. It could either be a white dwarf in the LMC with nuclear burning on its surface near the Eddington limit or another soft intermediate polar in our Galaxy. Conclusions. The discovery of new super-soft X-ray sources makes a significant contribution to the known population in our Galaxy. An observed higher density of sources in the direction of the Magellanic Clouds can likely be explained by the relatively low Galactic column density in their direction as well as a large number of existing observations sensitive at low X-ray energies.

show abstract

Section: New Galactic Magnetic Cataclysmic Variablessupporting

confidence: 82%

Discovery of four super-soft X-ray sources in XMM-Newton observations of the Large Magellanic Cloud

Maitra

Haberl

2021

A&A

View full text Add to dashboard Cite

show abstract

“…For an LMC distance also this system exhibits a luminosity of around 5×10 34 erg s −1 and a radius for the emitting area of ∼180 km. The detection of a 23.6 minute periodic modulation in the optical and identification of the optical counterpart confirms a location of the binary system in the Galaxy (Ramsay et al 2018).…”

Section: New Galactic Magnetic Cvssupporting

confidence: 62%

Discovery of four super-soft X-ray sources in XMM-Newton observations of the Large Magellanic Cloud

Maitra,

Haberl

2021

Preprint

View full text Add to dashboard Cite

Context. Super-soft X-ray sources were established as a heterogeneous class of objects from observations of the Large Magellanic Cloud (LMC). Aims. We have searched for new sources of this class in the X-ray images obtained from the XMM-Newton survey of the LMC and additional archival observations. Methods. We first selected candidates by visual inspection of the image, and screened out artefacts which can mimic super-soft X-ray sources as well as bright foreground stars which create optical loading on the CCD image. We finally obtained 4 new super-soft X-ray sources for which we performed detailed X-ray timing and spectral analysis and searched for possible optical counterparts to identify their nature. We also looked at archival ROSAT and Swift observations to investigate the long-term behaviour of the sources. Results. XMMU J050452.0−683909 is identified as the central star of the planetary nebula SMP LMC 21 in the LMC. We suggest XMMU J051854.8−695601 and XMMU J050815.1−691832 as new soft intermediate polars from the nature of their X-ray spectrum. Their estimated absorption-corrected luminosities and the blackbody radii indicate that they are located in our Galaxy, rather than the LMC. We discovered coherent pulsations of 497 s from XMMU J044626.6−692011 which indicates a magnetic cataclysmic variable nature of the source. The location of XMMU J044626.6−692011 in the LMC or our Galaxy is less clear. It could either be a white dwarf in the LMC with nuclear burning on its surface near the Eddington limit, or another soft intermediate polar in our Galaxy. Conclusions. The discovery of new super-soft X-ray sources makes a significant contribution to the known population in our own Galaxy. An observed higher density of sources in the direction of the Magellanic Clouds can likely be explained by the relatively low Galactic column density in their direction as well as a large number of existing observations sensitive at low X-ray energies.

show abstract

eRASSU J060839.5–704014: A double degenerate ultra-compact binary in the direction of the LMC

Maitra,

Haberl,

Vasilopoulos

et al. 2024

A&A

View full text Add to dashboard Cite

During four all-sky surveys (eRASS1--4) the soft X-ray instrument aboard Spektrum-Roentgen-Gamma (SRG) detected a new supersoft X-ray source in the direction of the Large Magellanic Cloud (LMC). We arranged follow-up observations in the X-ray and optical wavelengths and further searched in archival observations to reveal the nature of the object. Using X-ray observations with we investigated the temporal and spectral behaviour of the source. We discover pulsations at 374\,s with a pulse profile consistent with 100<!PCT!> modulation. We identify two other periodicities in the data, which we establish as aliases due to the sampling of the light curve. We identify a multi-wavelength counterpart to the X-ray source in UVW1 and g, r, i, and z images obtained by the optical/UV monitor on and the Dark Energy Camera at the Cerro Tololo Inter-American Observatory. The timing and spectral characteristics of the source are consistent with a double degenerate ultra-compact binary system in the foreground of the LMC. belongs to a rare class of AM CVns, which are important to study in the context of progenitors of SN\,Ia and for persistent gravitational wave detection. We identify as a new double degenerate ultra-compact binary located in the foreground of the LMC.

show abstract

Detection of a 23.6 min periodic modulation in the optical counterpart of 3XMMJ051034.6–670353

Cited by 3 publications

References 29 publications

Discovery of four super-soft X-ray sources in XMM-Newton observations of the Large Magellanic Cloud

Discovery of four super-soft X-ray sources in XMM-Newton observations of the Large Magellanic Cloud

Discovery of four super-soft X-ray sources in XMM-Newton observations of the Large Magellanic Cloud

eRASSU J060839.5–704014: A double degenerate ultra-compact binary in the direction of the LMC

Contact Info

Product

Resources

About