Suzaku Observation : 401058010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '401058010'          / Observation identification string
OBSERVER= 'TIMOTHY R. KALLMAN' / Principal Investigator
OBJECT  = '4U1700-37'          / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             255.9865 / planned target R.A.(deg)
DEC_OBJ =             -37.8441 / planned target DEC.(deg)
RA_NOM  = 2.559894000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -3.784410000000000E+01 / Declination of target (deci. deg)
PA_NOM  =             269.6945 / nominal position angle from north to DETY(deg)
MEAN_EA1=     255.989441603120 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=     127.844147053329 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     180.305482714914 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2006-09-13T10:44:38' / Start date of observations
DATE-END= '2006-09-14T22:03:14' / End date of observations
TSTART  = 2.114594828621773E+08 / time start
TSTOP   = 2.115863129531017E+08 / time stop
TELAPSE = 1.268300909243822E+05 / elapsed time
ONTIME  = 4.078259828230739E+04 / On-source time
EXPOSURE= 4.078259828230739E+04 / Exposure time
MJD-OBS = 5.399144846118260E+04 / MJD of data start time
FILIN001= 'ae401058010xi0_0_3x3b045a_cl.evt.gz' / Input file name
SEQPNUM =                    3 / 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= 'ae401058010xi0_0_5x5b045a_cl.evt.gz' / Input file name
FILIN003= 'ae401058010xi0_0_5x5n000a_cl.evt.gz' / Input file name
FILIN004= 'ae401058010xi1_0_3x3b062b_cl.evt.gz' / Input file name
FILIN005= 'ae401058010xi1_0_5x5b062b_cl.evt.gz' / Input file name
FILIN006= 'ae401058010xi1_0_5x5n001b_cl.evt.gz' / Input file name
FILIN007= 'ae401058010xi2_0_3x3b063a_cl.evt.gz' / Input file name
FILIN008= 'ae401058010xi2_0_5x5b063a_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:

The compact object in the massive X-ray binary 4U1700-37/HD153919 has been inferred to be a neutron star based on its spectral shape, but no pulsations have been observed. One possible explanation for the absence of observed pulsations is that the pulsed signal is beamed in directions other than our line of sight. This can be tested using Suzaku by searching for pulsations in the iron K line. This line is formed efficiently under almost all conditions of ionization and temperature, and so represents an X-ray bolometer which should respond to pulsed X-rays no matter where they are pointed. We plan to make such a search, and to probe the other properties of the wind and compact object in this system by observing with Suzaku for 80 ks away from eclipse.