Suzaku Observation : 408011010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '408011010'          / Observation identification string
OBSERVER= 'TERUAKI ENOTO'      / Principal Investigator
OBJECT  = '4U 0142+61'         / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =              26.5934 / planned target R.A.(deg)
DEC_OBJ =              61.7509 / planned target DEC.(deg)
RA_NOM  = 2.658380000000000E+01 / Right Ascension of target (deci. deg)
DEC_NOM = 6.176280000000000E+01 / Declination of target (deci. deg)
PA_NOM  =              82.9970 / nominal position angle from north to DETY(deg)
MEAN_EA1=      26.583758376204 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      28.237164043785 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=       7.003031566925 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2013-07-31T10:05:39' / Start date of observations
DATE-END= '2013-08-02T15:00:21' / End date of observations
TSTART  = 4.285807969458360E+08 / time start
TSTOP   = 4.287706010000000E+08 / time stop
TELAPSE = 1.898040541639924E+05 / elapsed time
ONTIME  = 1.011878175535202E+05 / On-source time
EXPOSURE= 1.011878175535202E+05 / Exposure time
MJD-OBS = 5.650442663344718E+04 / MJD of data start time
FILIN001= 'ae408011010xi0_0_3x3n112l_cl.evt.gz' / Input file name
SEQPNUM =                    8 / Number of times this dataset processed
PROCVER = '3.0.22.44'          / Processing script version
MK1STVER= 'mk1stfits20120530'  / Version of mk1stfits used
SOFTVER = 'Hea_08Feb2016_V6.18_Suzaku_14Nov2013_V22' / Version of HEADAS used
CALDBVER= 'hxd20110913_xis20160607_xrt20110630_xrs20060410' / Version of CALDB u
FILIN002= 'ae408011010xi0_0_5x5n112l_cl.evt.gz' / Input file name
FILIN003= 'ae408011010xi1_0_3x3n140b_cl.evt.gz' / Input file name
FILIN004= 'ae408011010xi1_0_5x5n140b_cl.evt.gz' / Input file name
FILIN005= 'ae408011010xi3_0_3x3n092a_cl.evt.gz' / Input file name
FILIN006= 'ae408011010xi3_0_5x5n092a_cl.evt.gz' / Input file name
COMMENT -------------------------
COMMENT BITPIX compressed from 32 to 8.
COMMENT Pixel values greater than 255 was set to 255.
COMMENT This file was made for JUDO-Suzaku.
COMMENT -------------------------
COMMENT   FITS (Flexible Image Transport System) format is defined in 'Astronomy

Abstract:

A toroidal magnetic field is thought to be formed in neutron star interior after core-collapse supernovae and become an energy source with recently observed X-ray outbursts from magnetars. Since the toroidal field is hidden in the stellar interior, it was thought to be undetectable via the well-known p-pdot method and the cyclotron resonance scattering features. However, a magnetic stress of the magnetar toroidal field is strong enough to distort the stellar shape and produce a free precession in its X-ray pulse timing if the emission pattern deviates from its axis of symmetry. From our analyses of magnetar 4U 0142+61, we found an evidence on the free precession in the hard X-ray component. To confirm and establish this evidence, we propose an additional 100 ks observation of 4U 0142+61.