Suzaku Observation : 802031010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '802031010'          / Observation identification string
OBSERVER= 'TAKAYA OHASHI'      / Principal Investigator
OBJECT  = 'A2142 OFFSET2'      / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             239.2136 / planned target R.A.(deg)
DEC_OBJ =              27.5782 / planned target DEC.(deg)
RA_NOM  = 2.392185000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = 2.756660000000000E+01 / Declination of target (deci. deg)
PA_NOM  =             260.7114 / nominal position angle from north to DETY(deg)
MEAN_EA1=     239.218524398136 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      62.433394195292 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     189.288584041773 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2007-09-15T11:32:09' / Start date of observations
DATE-END= '2007-09-17T01:30:25' / End date of observations
TSTART  = 2.431740730000000E+08 / time start
TSTOP   = 2.433063835508623E+08 / time stop
TELAPSE = 1.323105508622825E+05 / elapsed time
ONTIME  = 5.771866145402193E+04 / On-source time
EXPOSURE= 5.771866145402193E+04 / Exposure time
MJD-OBS = 5.435851547666667E+04 / MJD of data start time
FILIN001= 'ae802031010xi0_0_3x3n066a_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= 'ae802031010xi1_0_3x3n069b_cl.evt.gz' / Input file name
FILIN003= 'ae802031010xi3_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:

We propose to search for redshifted OVII and OVIII lines from the warm-hot intergalactic medium (WHIM) in a large-scale filament outside of a massive merging cluster of galaxies A2142. This cluster is characterized by prominent cold fronts, elongated X-ray morphology, and Beppo-SAX detection of hard X-ray emission, which all point to a recent merger and the matter density outside should be high. The strong reason why we choose this target is its right redshift (z=0.909), in which XIS sensitivity for redshifted oxygen lines separated from the Galactic lines becomes the highest. We expect 3 times higher sensitivity than our previous attempt for A2218 (Takei et al. in press) where we set 5 times lower upper limit for OVII line intensity than the XMM reported levels in other clusters.