Suzaku Observation : 807004010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '807004010'          / Observation identification string
OBSERVER= 'NAOMI OTA'          / Principal Investigator
OBJECT  = 'A1631_C '           / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             193.2413 / planned target R.A.(deg)
DEC_OBJ =             -15.3446 / planned target DEC.(deg)
RA_NOM  = 1.932396000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -1.534300000000000E+01 / Declination of target (deci. deg)
PA_NOM  =             112.9996 / nominal position angle from north to DETY(deg)
MEAN_EA1=     193.239615360107 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=     105.343027995037 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     337.000395874400 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2013-01-12T11:47:03' / Start date of observations
DATE-END= '2013-01-13T00:15:24' / End date of observations
TSTART  = 4.113082300000000E+08 / time start
TSTOP   = 4.113513068245209E+08 / time stop
TELAPSE = 4.307682452088594E+04 / elapsed time
ONTIME  = 2.381365492171049E+04 / On-source time
EXPOSURE= 2.381365492171049E+04 / Exposure time
MJD-OBS = 5.630451266416666E+04 / MJD of data start time
FILIN001= 'ae807004010xi0_0_3x3n066l_cl.evt.gz' / Input file name
SEQPNUM =                    4 / 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= 'ae807004010xi1_0_3x3n130b_cl.evt.gz' / Input file name
FILIN003= 'ae807004010xi3_0_3x3n066a_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 ROSAT flux-limited survey, we find that about 5-10 % of the galaxy clusters have a very diffuse, low X-ray surface brightness (hereafter, LSB clusters). They could possibly be explained as dynamically young systems, which have not yet formed a central core. Three such clusters in our XMM study of the REXCESS sample show surprisingly high entropies in the centers, which does not readily support the early formation stage. To shed more light on their nature, we propose to observe the extreme LSB cluster, A1631. This object has a higher optical to X-ray luminosity ratio than the bulk of other clusters and is expected to provide a key to understand the evolutionary scenario of the LSB clusters. Suzaku with its low background is best-suited for this study.