Suzaku Observation : 407041010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '407041010'          / Observation identification string
OBSERVER= 'KENJI HAMAGUCHI'    / Principal Investigator
OBJECT  = 'WR140   '           / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             305.1167 / planned target R.A.(deg)
DEC_OBJ =              43.8544 / planned target DEC.(deg)
RA_NOM  = 3.051374000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = 4.384750000000000E+01 / Declination of target (deci. deg)
PA_NOM  =             212.5272 / nominal position angle from north to DETY(deg)
MEAN_EA1=     305.137425633817 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      46.152488950375 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     237.472786192848 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2012-12-22T08:28:05' / Start date of observations
DATE-END= '2012-12-23T05:00:17' / End date of observations
TSTART  = 4.094801015982358E+08 / time start
TSTOP   = 4.095536850000000E+08 / time stop
TELAPSE = 7.358340176421404E+04 / elapsed time
ONTIME  = 5.480418617373705E+04 / On-source time
EXPOSURE= 5.480418617373705E+04 / Exposure time
MJD-OBS = 5.628335377062773E+04 / MJD of data start time
FILIN001= 'ae407041010xi0_0_2x2n066l_cl.evt.gz' / Input file name
SEQPNUM =                    2 / 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= 'ae407041010xi0_0_3x3n066l_cl.evt.gz' / Input file name
FILIN003= 'ae407041010xi0_0_5x5n066l_cl.evt.gz' / Input file name
FILIN004= 'ae407041010xi1_0_3x3n130b_cl.evt.gz' / Input file name
FILIN005= 'ae407041010xi1_0_5x5n130b_cl.evt.gz' / Input file name
FILIN006= 'ae407041010xi3_0_2x2n066a_cl.evt.gz' / Input file name
FILIN007= 'ae407041010xi3_0_3x3n066a_cl.evt.gz' / Input file name
FILIN008= 'ae407041010xi3_0_5x5n066a_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:

In the campaign observations of the prototypical colliding wind binary system WR 140 at its last periastron passage in 2009, Suzaku discovered an extremely hard and variable X-ray component. The current best explanation of its origin is inverse-Compton cooling of particles accelerated in the wind-wind collision shock, and if so this would be the first detection of non-thermal X-ray emission from any Wolf-Rayet system. However, other mechanisms cannot be excluded because the observed intensity was stronger than expected from the observed radio luminosity. We propose to re-observe WR 140 near apastron in 2012 with Suzaku to identify the emission mechanism which produces the hard component.