Discovery of Periodic Dips in the Brightest Hard X-Ray Source of M31 with EXTraS
We performed a search for eclipsing and dipping sources in the archive of the EXTraS project-a systematic characterization of the temporal behavior of XMM-Newton point sources. We discovered dips in the X-ray light curve of 3XMM J004232.1+411314, which has been recently associated with the hard X-ra...
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| Veröffentlicht in: | Astrophysical journal. Letters 2017-12, Vol.851 (2), p.L27 |
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| creator | Marelli, Martino Tiengo, Andrea Luca, Andrea De Salvetti, David Saronni, Luca Sidoli, Lara Paizis, Adamantia Salvaterra, Ruben Belfiore, Andrea Israel, Gianluca Haberl, Frank D'Agostino, Daniele |
| description | We performed a search for eclipsing and dipping sources in the archive of the EXTraS project-a systematic characterization of the temporal behavior of XMM-Newton point sources. We discovered dips in the X-ray light curve of 3XMM J004232.1+411314, which has been recently associated with the hard X-ray source dominating the emission of M31. A systematic analysis of XMM-Newton observations revealed 13 dips in 40 observations (total exposure time of ∼0.8 Ms). Among them, four observations show two dips, separated by ∼4.01 hr. Dip depths and durations are variable. The dips occur only during low-luminosity states ( erg s−1), while the source reaches erg s−1. We propose that this system is a new dipping low-mass X-ray binary in M31 seen at high inclination (60°-80°); the observed dipping periodicity is the orbital period of the system. A blue HST source within the Chandra error circle is the most likely optical counterpart of the accretion disk. The high luminosity of the system makes it the most luminous (not ULX) dipper known to date. |
| doi_str_mv | 10.3847/2041-8213/aa9b2e |
| format | Article |
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We discovered dips in the X-ray light curve of 3XMM J004232.1+411314, which has been recently associated with the hard X-ray source dominating the emission of M31. A systematic analysis of XMM-Newton observations revealed 13 dips in 40 observations (total exposure time of ∼0.8 Ms). Among them, four observations show two dips, separated by ∼4.01 hr. Dip depths and durations are variable. The dips occur only during low-luminosity states ( erg s−1), while the source reaches erg s−1. We propose that this system is a new dipping low-mass X-ray binary in M31 seen at high inclination (60°-80°); the observed dipping periodicity is the orbital period of the system. A blue HST source within the Chandra error circle is the most likely optical counterpart of the accretion disk. The high luminosity of the system makes it the most luminous (not ULX) dipper known to date.</description><identifier>ISSN: 2041-8205</identifier><identifier>EISSN: 2041-8213</identifier><identifier>DOI: 10.3847/2041-8213/aa9b2e</identifier><language>eng</language><publisher>Austin: The American Astronomical Society</publisher><subject>Accretion disks ; Dipping ; Emission analysis ; galaxies: bulges ; galaxies: individual (M31) ; Inclination ; Light curve ; Luminosity ; Optical counterparts (astronomy) ; Orbits ; Periodic variations ; Point sources ; pulsars: general ; stars: neutron ; X ray binaries ; X ray sources ; X ray stars ; X-rays: binaries ; XMM (spacecraft)</subject><ispartof>Astrophysical journal. Letters, 2017-12, Vol.851 (2), p.L27</ispartof><rights>2017. The American Astronomical Society. 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Letters</title><addtitle>APJL</addtitle><addtitle>Astrophys. J. Lett</addtitle><description>We performed a search for eclipsing and dipping sources in the archive of the EXTraS project-a systematic characterization of the temporal behavior of XMM-Newton point sources. We discovered dips in the X-ray light curve of 3XMM J004232.1+411314, which has been recently associated with the hard X-ray source dominating the emission of M31. A systematic analysis of XMM-Newton observations revealed 13 dips in 40 observations (total exposure time of ∼0.8 Ms). Among them, four observations show two dips, separated by ∼4.01 hr. Dip depths and durations are variable. The dips occur only during low-luminosity states ( erg s−1), while the source reaches erg s−1. We propose that this system is a new dipping low-mass X-ray binary in M31 seen at high inclination (60°-80°); the observed dipping periodicity is the orbital period of the system. A blue HST source within the Chandra error circle is the most likely optical counterpart of the accretion disk. 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Lett</addtitle><date>2017-12-20</date><risdate>2017</risdate><volume>851</volume><issue>2</issue><spage>L27</spage><pages>L27-</pages><issn>2041-8205</issn><eissn>2041-8213</eissn><abstract>We performed a search for eclipsing and dipping sources in the archive of the EXTraS project-a systematic characterization of the temporal behavior of XMM-Newton point sources. We discovered dips in the X-ray light curve of 3XMM J004232.1+411314, which has been recently associated with the hard X-ray source dominating the emission of M31. A systematic analysis of XMM-Newton observations revealed 13 dips in 40 observations (total exposure time of ∼0.8 Ms). Among them, four observations show two dips, separated by ∼4.01 hr. Dip depths and durations are variable. The dips occur only during low-luminosity states ( erg s−1), while the source reaches erg s−1. We propose that this system is a new dipping low-mass X-ray binary in M31 seen at high inclination (60°-80°); the observed dipping periodicity is the orbital period of the system. A blue HST source within the Chandra error circle is the most likely optical counterpart of the accretion disk. 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| subjects | Accretion disks Dipping Emission analysis galaxies: bulges galaxies: individual (M31) Inclination Light curve Luminosity Optical counterparts (astronomy) Orbits Periodic variations Point sources pulsars: general stars: neutron X ray binaries X ray sources X ray stars X-rays: binaries XMM (spacecraft) |
| title | Discovery of Periodic Dips in the Brightest Hard X-Ray Source of M31 with EXTraS |
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