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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/26788
Title: Discovery of Periodic Dips in the Brightest Hard X-Ray Source of M31 with EXTraS
Authors: MARELLI, MARTINO 
TIENGO, ANDREA
DE LUCA, Andrea 
Salvetti, David
SARONNI, LUCA
SIDOLI, Lara 
PAIZIS, ADAMANTIA 
SALVATERRA, Ruben 
BELFIORE MONDONI, Andrea 
ISRAEL, Gian Luca 
Haberl, Frank
D'Agostino, Daniele
Issue Date: 2017
Journal: THE ASTROPHYSICAL JOURNAL LETTERS 
Number: 851
Issue: 2
First Page: L27
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 ({L}<SUB>0.2{--</SUB>12}< 1× {10}<SUP>38</SUP> erg s<SUP>-1</SUP>), while the source reaches {L}<SUB>0.2{--</SUB>12}∼ 2.8× {10}<SUP>38</SUP> erg s<SUP>-1</SUP>. 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.
URI: http://hdl.handle.net/20.500.12386/26788
URL: https://iopscience.iop.org/article/10.3847/2041-8213/aa9b2e
https://arxiv.org/pdf/1711.05540.pdf
ISSN: 2041-8205
DOI: 10.3847/2041-8213/aa9b2e
Bibcode ADS: 2017ApJ...851L..27M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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