Suzaku Observation : 808089020

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '808089020'          / Observation identification string
OBSERVER= 'KA-WAH WONG'        / Principal Investigator
OBJECT  = 'ABELL 1689 (OFFSET)' / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             198.1815 / planned target R.A.(deg)
DEC_OBJ =              -1.2641 / planned target DEC.(deg)
RA_NOM  = 1.981818000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -1.268700000000000E+00 / Declination of target (deci. deg)
PA_NOM  =             293.5484 / nominal position angle from north to DETY(deg)
MEAN_EA1=     198.181754391231 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      91.268709634367 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     156.451613045275 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2013-06-30T09:00:12' / Start date of observations
DATE-END= '2013-07-02T07:15:18' / End date of observations
TSTART  = 4.258980199688723E+08 / time start
TSTOP   = 4.260645035559756E+08 / time stop
TELAPSE = 1.664835871032476E+05 / elapsed time
ONTIME  = 6.781625187784433E+04 / On-source time
EXPOSURE= 6.781625187784433E+04 / Exposure time
MJD-OBS = 5.647337597399158E+04 / MJD of data start time
FILIN001= 'ae808089020xi0_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= 'ae808089020xi0_0_5x5n066l_cl.evt.gz' / Input file name
FILIN003= 'ae808089020xi1_0_3x3n130b_cl.evt.gz' / Input file name
FILIN004= 'ae808089020xi1_0_5x5n130b_cl.evt.gz' / Input file name
FILIN005= 'ae808089020xi3_0_3x3n066a_cl.evt.gz' / Input file name
FILIN006= 'ae808089020xi3_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:

Recent Suzaku results suggest that the surface brightness in galaxy cluster outskirts is higher than the predictions by self-similar models, indicating that the gas may be clumpy or may not be in collisional equilibrium near and beyond the virial radius. If this is the case, gas emission near cosmological accretion shocks should readily be detected. We propose to search for emission near the accretion shock radius where it is the only region unexplored in galaxy cluster studies in X-ray. These data can place important constraints on accretion models and large-scale structure formation theory. Physical properties at the true virial radius (R100) will also be measured to the highest precision to date. A very deep exposure and the low Suzaku background allow this measurement.