Suzaku Observation : 409049010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '409049010'          / Observation identification string
OBSERVER= 'JOHN A. TOMSICK'    / Principal Investigator
OBJECT  = 'CYGNUS X-1'         / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             299.5904 / planned target R.A.(deg)
DEC_OBJ =              35.2017 / planned target DEC.(deg)
RA_NOM  = 2.995796000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = 3.521190000000000E+01 / Declination of target (deci. deg)
PA_NOM  =              58.5817 / nominal position angle from north to DETY(deg)
MEAN_EA1=     299.579646464792 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      54.788053714713 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=      31.418286757338 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2014-05-19T06:38:31' / Start date of observations
DATE-END= '2014-05-22T07:50:20' / End date of observations
TSTART  = 4.538717810000000E+08 / time start
TSTOP   = 4.540584424521425E+08 / time stop
TELAPSE = 1.866614521424770E+05 / elapsed time
ONTIME  = 1.451277607262135E+04 / On-source time
EXPOSURE= 1.451277607262135E+04 / Exposure time
MJD-OBS = 5.679714635629630E+04 / MJD of data start time
FILIN001= 'ae409049010xi1_0_3x3b136b_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= 'ae409049010xi1_0_5x5b136b_cl.evt.gz' / Input file name
FILIN003= 'ae409049010xi1_0_5x5n130b_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 for a 30 ks observation of the accreting black hole Cygnus X-1 to occur simultaneously with NuSTAR. In mid-2012, we obtained a joint Suzaku/NuSTAR observation of Cyg X-1 in the soft state, and we clearly see reflection features with a relativistically broadened iron line that we have used to constrain the geometry of the accretion disk, including finding possible evidence for a warped accretion disk, and the black hole spin. This TOO proposal is to observe the source in the hard state to constrain how the accretion geometry changes between states. The combination of Suzaku and NuSTAR covers, with very good energy resolution and throughput, the thermal component, the iron line complex, the iron absorption edge, and the hard X-ray reflection hump.