Suzaku Observation : 708043010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '708043010'          / Observation identification string
OBSERVER= 'MURRAY BRIGHTMAN'   / Principal Investigator
OBJECT  = 'NGC 3660'           / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             170.8845 / planned target R.A.(deg)
DEC_OBJ =              -8.6586 / planned target DEC.(deg)
RA_NOM  = 1.708830000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -8.656100000000000E+00 / Declination of target (deci. deg)
PA_NOM  =             109.6283 / nominal position angle from north to DETY(deg)
MEAN_EA1=     170.882958824201 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      98.656055030310 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     340.371739728893 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2013-11-28T03:30:47' / Start date of observations
DATE-END= '2013-12-01T00:00:17' / End date of observations
TSTART  = 4.389273700000000E+08 / time start
TSTOP   = 4.391712043541753E+08 / time stop
TELAPSE = 2.438343541752696E+05 / elapsed time
ONTIME  = 1.247854624284506E+05 / On-source time
EXPOSURE= 1.247854624284506E+05 / Exposure time
MJD-OBS = 5.662417863638889E+04 / MJD of data start time
FILIN001= 'ae708043010xi0_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= 'ae708043010xi0_0_5x5n066l_cl.evt.gz' / Input file name
FILIN003= 'ae708043010xi1_0_3x3n130b_cl.evt.gz' / Input file name
FILIN004= 'ae708043010xi1_0_5x5n130b_cl.evt.gz' / Input file name
FILIN005= 'ae708043010xi3_0_3x3n066a_cl.evt.gz' / Input file name
FILIN006= 'ae708043010xi3_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:

We propose a 120-ks observation of NGC 3660, which is a strong candidate for a True Seyfert 2, a Seyfert that intrinsically lacks the broad line regions (BLRs), and challenges the AGN unified scheme. However, a puzzling BeppoSAX observation lingers, which shows excess emission above 10 keV indicative of a Compton thick AGN. Nevertheless, rapid variability below 10 keV and meagre iron line emission (EW=60 eV) strongly argue against this conclusion. Data from the HXD will elucidate the situation, and either dispel this evidence, adding weight to the True Seyfert 2 scenario, or confirm the presence of heavily obscured emission, which may be explained by a partial covering scenario.