Suzaku Observation : 801020010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '801020010'          / Observation identification string
OBSERVER= 'YUTAKA FUJITA'      / Principal Investigator
OBJECT  = 'A399/401 FILAMENT'  / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =              44.7500 / planned target R.A.(deg)
DEC_OBJ =              13.2500 / planned target DEC.(deg)
RA_NOM  = 4.474750000000000E+01 / Right Ascension of target (deci. deg)
DEC_NOM = 1.324850000000000E+01 / Declination of target (deci. deg)
PA_NOM  =              74.1756 / nominal position angle from north to DETY(deg)
MEAN_EA1=      44.747491799325 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      76.751459977782 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=      15.824354995644 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2006-08-19T04:10:07' / Start date of observations
DATE-END= '2006-08-22T11:08:24' / End date of observations
TSTART  = 2.092771580000000E+08 / time start
TSTOP   = 2.095600832375232E+08 / time stop
TELAPSE = 2.829252375231981E+05 / elapsed time
ONTIME  = 1.510681068810821E+05 / On-source time
EXPOSURE= 1.510681068810821E+05 / Exposure time
MJD-OBS = 5.396619007157407E+04 / MJD of data start time
FILIN001= 'ae801020010xi0_0_3x3n000a_cl.evt.gz' / Input file name
SEQPNUM =                    4 / 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= 'ae801020010xi0_0_5x5n000a_cl.evt.gz' / Input file name
FILIN003= 'ae801020010xi1_0_3x3n001b_cl.evt.gz' / Input file name
FILIN004= 'ae801020010xi1_0_5x5n001b_cl.evt.gz' / Input file name
FILIN005= 'ae801020010xi2_0_3x3n000a_cl.evt.gz' / Input file name
FILIN006= 'ae801020010xi2_0_5x5n000a_cl.evt.gz' / Input file name
FILIN007= 'ae801020010xi3_0_3x3n000a_cl.evt.gz' / Input file name
FILIN008= 'ae801020010xi3_0_5x5n000a_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:

Although warm-hot intergalactic medium (WHIM) is supposed to account for most of the baryon in the Universe, its detection is extremely difficult. Here, we propose to observe the cosmological filament between clusters A399 and A401 with Suzaku. We try to detect the OVII emission line and confirm the existence of WHIM in the filament. We expect that the density of the WHIM in the filament is high, and that the detection will be easier than that in other regions in the Universe. Moreover, since the redshift of the filament is relatively high, we can discriminate between the OVII mission from the WHIM and that from our Galaxy by studying the redshift of the line.