Suzaku Observation : 508002010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '508002010'          / Observation identification string
OBSERVER= 'HIROYUKI UCHIDA'    / Principal Investigator
OBJECT  = 'W44_WEST'           / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             283.9357 / planned target R.A.(deg)
DEC_OBJ =               1.3275 / planned target DEC.(deg)
RA_NOM  = 2.839390000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = 1.321600000000000E+00 / Declination of target (deci. deg)
PA_NOM  =             254.9999 / nominal position angle from north to DETY(deg)
MEAN_EA1=     283.938968900166 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      88.678449430735 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     195.000099287355 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2013-10-24T12:15:50' / Start date of observations
DATE-END= '2013-10-25T23:10:22' / End date of observations
TSTART  = 4.359324770400959E+08 / time start
TSTOP   = 4.360578050022258E+08 / time stop
TELAPSE = 1.253279621298909E+05 / elapsed time
ONTIME  = 6.113983516466618E+04 / On-source time
EXPOSURE= 6.113983516466618E+04 / Exposure time
MJD-OBS = 5.658951552342704E+04 / MJD of data start time
FILIN001= 'ae508002010xi0_0_3x3n066l_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= 'ae508002010xi0_0_5x5n066l_cl.evt.gz' / Input file name
FILIN003= 'ae508002010xi1_0_3x3n130b_cl.evt.gz' / Input file name
FILIN004= 'ae508002010xi1_0_5x5n130b_cl.evt.gz' / Input file name
FILIN005= 'ae508002010xi3_0_3x3n066a_cl.evt.gz' / Input file name
FILIN006= 'ae508002010xi3_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:

W44 is a middle-aged supernova remnant (SNR) categorized to mixed-morphology SNR. We have observed the center region of W44 with Suzaku in the AO5 phase. The spectra are well reproduced by a thermal plasma in a recombining phase. While such plasmas have been found from several SNRs, the origin is still unclear. We also discover hard X-ray emission which shows an arc-like structure spatially-correlated with a radio continuum filament. No conventional model for particle acceleration could explain the mechanism of the hard X-ray emission. The entire plasma distribution of W44 will provide a clue to resolve the origins of the reombining plasma and the hard X-ray emission. We therefore require four pointing observations for totally 280 ks.