Suzaku Observation : 401030020

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '401030020'          / Observation identification string
OBSERVER= 'ATSUMASA YOSHIDA'   / Principal Investigator
OBJECT  = '1E1207.4-5209'      / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             182.5000 / planned target R.A.(deg)
DEC_OBJ =             -52.4411 / planned target DEC.(deg)
RA_NOM  = 1.824916000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -5.244200000000000E+01 / Declination of target (deci. deg)
PA_NOM  =             148.6893 / nominal position angle from north to DETY(deg)
MEAN_EA1=     182.491596917007 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=     142.441992081766 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     301.310657519257 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2007-02-15T05:00:35' / Start date of observations
DATE-END= '2007-02-16T15:20:14' / End date of observations
TSTART  = 2.248309310000000E+08 / time start
TSTOP   = 2.249540140000000E+08 / time stop
TELAPSE = 1.230830000000000E+05 / elapsed time
ONTIME  = 4.982663491606712E+04 / On-source time
EXPOSURE= 4.982663491606712E+04 / Exposure time
MJD-OBS = 5.414621059240741E+04 / MJD of data start time
FILIN001= 'ae401030020xi1_0_3x3n069b_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= 'ae401030020xi1_0_5x5n069b_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:

1E1207.4-5209 may be the most exotic astronomical object. We propose a temporal and spectroscopic study of this peculiar X-ray source that was regarded as a "cooling" isolated NS. The previous Chandra/Newton observations reported "harmonic absorption" lines at 0.7, 1.4 and 2.1keV. Possible interpretations are electron cyclotron lines at B = 10^{10} G, ionic transition lines at 10^{12-13} G, and proton cyclotron lines at 10^{14} G. These are inconsistent each other. The highest B-field could suggest that the source is a member of "magnetars". Alternative explanation is the source might be a "strange" star with a lower mass. Suzaku observation of these line features should be the most powerful tool to investigate B field of this very peculiar object.