J/ApJ/851/L27 Two dips in the LC of 3XMMJ004232.1+411314 (Marelli+, 2017)
Discovery of periodic dips in the brightest hard X-ray source of M31 with
EXTraS.
Marelli M., Tiengo A., De Luca A., Salvetti D., Saronni L., Sidoli L.,
Paizis A., Salvaterra R., Belfiore A., Israel G., Haberl F., D'Agostino D.
<Astrophys. J., 851, L27 (2017)>
=2017ApJ...851L..27M 2017ApJ...851L..27M
ADC_Keywords: Binaries, X-ray; X-ray sources
Keywords: galaxies: bulges ; galaxies: individual (M31) ; pulsars: general ;
stars: neutron ; X-rays: binaries
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 ∼0.8Ms). Among them, four
observations show two dips, separated by ∼4.01hr. Dip depths and
durations are variable. The dips occur only during low-luminosity
states (L0.2-12<1x1038erg/s), while the source reaches
L0.2-12∼2.8x1038erg/s. 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:
We searched for all the XMM-Newton observations of 3XMMJ004232.1+411314
in the 3XMM catalog DR7 (see IX/50). Exploring the X-ray Transient and
variable Sky (EXTraS; De Luca+ 2016ASSP...42..291D 2016ASSP...42..291D) data make use of
the same filters as the 3XMM catalogs --energy band (0.2-12keV).
Objects:
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RA (ICRS) DE Designation(s)
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00 42 32.07 +41 13 14.3 XMM0042 = 3XMM J004232.1+411314
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 124 44 Dipping light curve parameters
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See also:
B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2012)
IX/50 : XMM-Newton Serendipitous Source Catalog 3XMM-DR6 (XMM-SSC, 2016)
J/ApJ/577/738 : M31 Chandra X-ray point sources (Kong+, 2002)
J/ApJ/578/114 : Chandra HRC source in M31 (Kaaret, 2002)
J/ApJ/609/735 : M31 Chandra X-ray sources (Williams+, 2004)
J/A+A/434/483 : An XMM-Newton survey of M 31 (Pietsch+, 2005)
J/A+A/468/49 : LMXBs in the bulge of M31 (Voss+, 2007)
J/A+A/480/599 : XMM-Newton survey of M31 centre field (Stiele+, 2008)
J/A+A/534/A55 : Deep XMM-Newton Survey of M31 (Stiele+, 2011)
J/ApJ/756/27 : Classification of sources from the 2XMMi-DR3 cat. (Lin+, 2012)
J/A+A/555/A65 : X-ray variability of M31 central field (Hofmann+, 2013)
J/ApJ/780/83 : X-ray binaries observed in M31 with Chandra (Barnard+, 2014)
J/ApJ/813/28 : Autoclassification of variable 3XMM sources (Farrell+, 2015)
J/ApJS/224/40 : Catalog of Chandra ACIS point like sources (Wang+, 2016)
J/MNRAS/461/3443 : M31 deepest Chandra catalog of point sources (Vulic+, 2016)
http://xmmssc-www.star.le.ac.uk/Catalogue/3XMM-DR4/ : 3XMM-DR4 online catalog
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/40] Observation number
4- 13 I10 --- ObsID [109270101/727960401] XMM ObsID
16- 34 A19 "datime" Date Observation Date (YYYY-MM-DDThh:mm:ss)
36- 39 F4.1 ks Exp [10.5/63] Live exposure time
41- 48 A8 --- Fit Best fit model
50- 52 I3 --- DoF [0/126]? Degrees of Freedom
54- 61 E8.2 --- nhp [0/1]? Null hypothesis probability
63- 66 F4.2 10+31W Lout [0/2.9]? Luminosity outside the dip,
in 10+38erg/s units
68- 71 F4.2 10+31W e_Lout [0/0.1]? Uncertainty in Lout
73- 80 E8.1 10+31J/s2 lin [-5.1e-06/0]? Linear (decrease) in
luminosity; in 10+38erg/s2 (1)
82- 88 E7.1 10+31J/s2 e_lin [0/7e-07]? Uncertainty in lin
90- 98 F9.3 d Tmin [54100.7/55941.8]? Time of minimum
luminosity; JD-2400000.5
100-104 F5.3 d e_Tmin [0.001/0.004]? Uncertainty in Tmin
106-109 F4.2 ks DeltaT [2/5]? Duration of the dip
111-114 F4.2 ks e_DeltaT [0.3/1.8]? Uncertainty in DeltaT
116-119 F4.2 10+31W Lmin [0.08/1]? Minimum luminosity,
in 10+38erg/s units
121-124 F4.2 10+31W e_Lmin [0.02/0.2]? Uncertainty in Lmin
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Note (1): The luminosity at a time (t) is given as
Luminosity(t)[erg/s]=Luminosity(t0)[erg/s]+lin[erg/s2]*t[s].
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Jul-2018