Suzaku Observation : 808040010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '808040010'          / Observation identification string
OBSERVER= 'HIROKO YOSHIDA'     / Principal Investigator
OBJECT  = 'A2255_SE'           / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             258.2516 / planned target R.A.(deg)
DEC_OBJ =              63.8232 / planned target DEC.(deg)
RA_NOM  = 2.582963000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = 6.381920000000000E+01 / Declination of target (deci. deg)
PA_NOM  =             200.0025 / nominal position angle from north to DETY(deg)
MEAN_EA1=     258.296300488090 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      26.180788932363 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     249.997531635226 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2013-11-17T22:44:20' / Start date of observations
DATE-END= '2013-11-19T07:24:14' / End date of observations
TSTART  = 4.380452860000000E+08 / time start
TSTOP   = 4.381610365885808E+08 / time stop
TELAPSE = 1.157505885807872E+05 / elapsed time
ONTIME  = 6.474095135301352E+04 / On-source time
EXPOSURE= 6.474095135301352E+04 / Exposure time
MJD-OBS = 5.661396933083333E+04 / MJD of data start time
FILIN001= 'ae808040010xi0_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= 'ae808040010xi0_0_5x5n066l_cl.evt.gz' / Input file name
FILIN003= 'ae808040010xi1_0_3x3n130b_cl.evt.gz' / Input file name
FILIN004= 'ae808040010xi1_0_5x5n130b_cl.evt.gz' / Input file name
FILIN005= 'ae808040010xi3_0_3x3n066a_cl.evt.gz' / Input file name
FILIN006= 'ae808040010xi3_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:

We propose to obtain high-quality X-ray spectra of two subcluster regions in A2255 aiming at detection of supersonic motion of the intracluster gas. Previous optical and X-ray observations suggest that A2255 is indeed in the process of merging and subclusters have high velocities relative to the main cluster. Utilizing the high-sensitivity Suzaku spectroscopy, the line-of-sight velocity of the X-ray emitting gas can be measured from the Doppler shift of iron-K lines. With additional 40ks/80ks observations of the NW/SE subclusters, we expect to detect significant bulk velocities for the first time in this cluster. This will enhance our understanding of the 3-dimensional structure of the object including line-of-sight gas velocities and the cluster dynamical evolution.