Suzaku Observation : 804087010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '804087010'          / Observation identification string
OBSERVER= 'HANS - BOEHRINGER'  / Principal Investigator
OBJECT  = 'A76 EAST'           / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =              10.1300 / planned target R.A.(deg)
DEC_OBJ =               6.8444 / planned target DEC.(deg)
RA_NOM  = 1.013320000000000E+01 / Right Ascension of target (deci. deg)
DEC_NOM = 6.837400000000000E+00 / Declination of target (deci. deg)
PA_NOM  =             260.0024 / nominal position angle from north to DETY(deg)
MEAN_EA1=      10.133235401065 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      83.162589981552 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     189.997560826644 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2009-12-18T08:15:58' / Start date of observations
DATE-END= '2009-12-18T21:00:19' / End date of observations
TSTART  = 3.144403830000000E+08 / time start
TSTOP   = 3.144852000424625E+08 / time stop
TELAPSE = 4.481704246246815E+04 / elapsed time
ONTIME  = 2.363704205876589E+04 / On-source time
EXPOSURE= 2.363704205876589E+04 / Exposure time
MJD-OBS = 5.518335702759259E+04 / MJD of data start time
FILIN001= 'ae804087010xi0_0_3x3n066l_cl.evt.gz' / Input file name
SEQPNUM =                    2 / Number of times this dataset processed
PROCVER = '3.0.22.43'          / Processing script version
MK1STVER= 'mk1stfits20120530'  / Version of mk1stfits used
SOFTVER = 'Hea_08Feb2016_V6.18_Suzaku_14Nov2013_V22' / Version of HEADAS used
CALDBVER= 'hxd20110913_xis20151005_xrt20110630_xrs20060410' / Version of CALDB u
FILIN002= 'ae804087010xi1_0_3x3n069b_cl.evt.gz' / Input file name
FILIN003= 'ae804087010xi3_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 our flux limited survey of galaxy clusters in the ROSAT All-Sky Atlas we find that about 5 - 10 percent of the galaxy clusters have a diffuse, low X-ray surface brightness. These objects could possibly be explained as dynamically very young clusters, which have not yet formed a central core. Three such clusters in our XMM-Newton study of an unbiased sub-sample of 33 galaxy clusters, REXCESS, show suprisingly high entropies in their centers which does not readily support the early formation stage. To shed more light on the nature of these clusters we propose to observe two extremely low surface brightness clusters at low redshift, for which we also have detailed optical data. SUZAKU with its low background is ideally suited for this study.