Suzaku Observation : 404069040

QL FITS Image

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Fits Header
TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '404069040'          / Observation identification string
OBSERVER= 'MANUEL LINARES'     / Principal Investigator
OBJECT  = '4U 1820-30'         / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             275.9185 / planned target R.A.(deg)
DEC_OBJ =             -30.3611 / planned target DEC.(deg)
RA_NOM  = 2.759314000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -3.041930000000000E+01 / Declination of target (deci. deg)
PA_NOM  =             261.8762 / nominal position angle from north to DETY(deg)
MEAN_EA1=     275.931356795520 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=     120.419298614130 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     188.123830496558 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2009-09-28T16:04:20' / Start date of observations
DATE-END= '2009-09-29T12:00:23' / End date of observations
TSTART  = 3.074725605343672E+08 / time start
TSTOP   = 3.075407995248853E+08 / time stop
TELAPSE = 6.823899051809311E+04 / elapsed time
ONTIME  = 1.432267010456324E+04 / On-source time
EXPOSURE= 1.432267010456324E+04 / Exposure time
MJD-OBS = 5.510271093424036E+04 / MJD of data start time
FILIN001= 'ae404069040xi0_0_2x2b126l_cl.evt.gz' / Input file name
SEQPNUM =                    2 / 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= 'ae404069040xi0_0_3x3b126l_cl.evt.gz' / Input file name
FILIN003= 'ae404069040xi0_0_3x3n066l_cl.evt.gz' / Input file name
FILIN004= 'ae404069040xi1_0_3x3b128b_cl.evt.gz' / Input file name
FILIN005= 'ae404069040xi1_0_3x3n069b_cl.evt.gz' / Input file name
FILIN006= 'ae404069040xi3_0_2x2b127a_cl.evt.gz' / Input file name
FILIN007= 'ae404069040xi3_0_3x3b127a_cl.evt.gz' / Input file name
FILIN008= 'ae404069040xi3_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:

Fe K-alpha lines have now been detected in about half a dozen of neutron-star X-ray binaries. These lines can be used to set tight constrains on the accretion disk geometry and the radius of the neutron star. In two of these systems, the inner radius of the accretion disk as inferred from the line profile appears to be consistent with the radius inferred from the frequency of the kilohertz quasi-periodic oscillations (kHz QPOs). However, contemporaneous measurements in one of these systems appear to contradict this picture. We propose to observe 4U 1820-30 with Suzaku, simultaneously with RXTE. Our program will sample a wide range of inner disk radii and thereby explore the combined use of Fe K-alpha lines and kHz QPOs to probe strong gravity in X-ray binaries.