Suzaku Observation : 707019010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '707019010'          / Observation identification string
OBSERVER= 'JON MILLER'         / Principal Investigator
OBJECT  = 'HOLMBERG IX X-1'    / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             149.4722 / planned target R.A.(deg)
DEC_OBJ =              69.0634 / planned target DEC.(deg)
RA_NOM  = 1.494435000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = 6.904859999999999E+01 / Declination of target (deci. deg)
PA_NOM  =             311.5635 / nominal position angle from north to DETY(deg)
MEAN_EA1=     149.443496516034 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      20.951405931127 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     138.436506315407 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2012-04-13T18:10:55' / Start date of observations
DATE-END= '2012-04-17T16:20:14' / End date of observations
TSTART  = 3.876565039849845E+08 / time start
TSTOP   = 3.879923870000000E+08 / time stop
TELAPSE = 3.358830150155425E+05 / elapsed time
ONTIME  = 1.825273816981316E+05 / On-source time
EXPOSURE= 1.825273816981316E+05 / Exposure time
MJD-OBS = 5.603076583528917E+04 / MJD of data start time
FILIN001= 'ae707019010xi0_0_3x3n066l_cl.evt.gz' / Input file name
SEQPNUM =                    2 / 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= 'ae707019010xi0_0_5x5n066l_cl.evt.gz' / Input file name
FILIN003= 'ae707019010xi1_0_3x3n130b_cl.evt.gz' / Input file name
FILIN004= 'ae707019010xi1_0_5x5n130b_cl.evt.gz' / Input file name
FILIN005= 'ae707019010xi3_0_3x3n066a_cl.evt.gz' / Input file name
FILIN006= 'ae707019010xi3_0_5x5n066a_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:

Recent X-ray observations have found evidence that a subset of the most extreme ultra-luminous X-ray sources (ULXs) are either intermediate-mass black holes or stellar-mass binaries in a super-Eddington state. Current data are unable to deliver a clear answer, but the diagnostics possible in a long observation will be decisive. We request a 500 ks observation of the ULX Holmberg IX X-1 to place crucial constraints on atomic features that would signal a super-Eddington flow. Detecting or ruling out atomic features naturally requires a deep exposure. The strong spectral constraints derived will reveal the nature of the accreting black holes in these systems. A definitive statement on the existence of 100-1000 Msun black holes or extreme accretion states will be an important Suzaku legacy.