Suzaku Observation : 809023010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '809023010'          / Observation identification string
OBSERVER= 'NAOMI OTA'          / Principal Investigator
OBJECT  = 'RXCJ2157.4-0747 SW' / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             329.5573 / planned target R.A.(deg)
DEC_OBJ =              -7.7299 / planned target DEC.(deg)
RA_NOM  = 3.295619000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -7.732800000000000E+00 / Declination of target (deci. deg)
PA_NOM  =             250.0004 / nominal position angle from north to DETY(deg)
MEAN_EA1=     329.561895950931 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      97.732837434811 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     199.999569951113 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2014-11-15T04:52:01' / Start date of observations
DATE-END= '2014-11-15T17:32:14' / End date of observations
TSTART  = 4.693429700000000E+08 / time start
TSTOP   = 4.693846500000000E+08 / time stop
TELAPSE = 4.168000000000000E+04 / elapsed time
ONTIME  = 2.091879521137476E+04 / On-source time
EXPOSURE= 2.091879521137476E+04 / Exposure time
MJD-OBS = 5.697621104379630E+04 / MJD of data start time
FILIN001= 'ae809023010xi0_0_3x3n066t_cl.evt.gz' / Input file name
SEQPNUM =                    3 / 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= 'ae809023010xi0_0_5x5n066t_cl.evt.gz' / Input file name
FILIN003= 'ae809023010xi1_0_3x3n130b_cl.evt.gz' / Input file name
FILIN004= 'ae809023010xi1_0_5x5n130b_cl.evt.gz' / Input file name
FILIN005= 'ae809023010xi3_0_3x3n066a_cl.evt.gz' / Input file name
FILIN006= 'ae809023010xi3_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:

About 5-10% of galaxy clusters in the ROSAT survey have a very diffuse, low X-ray surface brightness (hereafter, LSB clusters). There are only 5 LSB clusters in the nearby universe, but it is no surprise that the majority of them may have been missed in existing X-ray surveys. Revealing gas and mass profiles of this unexplored population is critical not only for understanding its nature but cluster cosmology. Our Suzaku study of 2 LSB clusters indicated that their gas profiles deviate from self-similar expectations. We thus aim at establishing our findings by observing 3 remaining LSB clusters, clarifying whether they follow a similar trend, and inferring their mean gas profiles and dispersions. This study can only be achieved by the Suzaku's high sensitivity for diffuse emission.