Please send your comments or requests to Teng Liu (liu@mpe.mpg.de)

== eROSITA ECF ==
 * Assuming a spectral model, the ECF is calculated as the ratio of the count rate of Xspec fake spectra to the model flux (erg/cm^2/s).
 * The RMF and ARF files of an eFEDS source generated from the c946 data are used. There is no updates by now.
  * RMF: [[attachment:020_RMF_00001.fits|020_RMF_00001.fits]]
  * ARF: [[attachment:ARF_nocorr.fits|ARF_nocorr.fits]]

	The "srctool" extracted ARF is corrected for vignetting and PSF-loss at a particular position for a given extraction region. We un-correct the ARF by dividing the "SPECRESP" by the correction "CORRCOMB".

 * Two ECFs are calculated in each case
  * "ECF_obs" column: convert count rate to observed flux
  * "ECF_cor" column: convert count rate to Galactic-absorption-corrected flux

== powerlaw model ==
 * download [[attachment:eRO_ECF_powerlaw.v1.dat|eRO_ECF_powerlaw.dat]]
 * using a "TBabs*powerlaw" model
 * for a series of Galactic absorption logNH: betwen 19.5 and 22.5, with a step of 0.5
 * for a series of powerlaw slope: 1.4, 1.7, 2.0, 2.3, and 2.6
 * for a series of bands: 0.2-0.6, 0.6-2.3, 2.3-5.0, 5.0-8.0, 0.5-2.0, 2.0-5.0, 0.2-0.5, 0.5-1, 1-2, 2-4.5 keV

{{attachment:eRO_ECF_powerlaw_obs.png||width=500}}
{{attachment:eRO_ECF_powerlaw_cor.png||width=500}}

== apec model ==
 * download [[attachment:eRO_ECF_apec.v1.dat|eRO_ECF_apec.dat]]
 * using a "TBabs*apec" model
 * for a series of Galactic absorption logNH: betwen 19.5 and 22.5, with a step of 0.5
 * for a series of kT: between 0.5 and 10 keV, with a step of 0.5
 * for a series of redshift: between 0 and 3, with a step of 0.1
 * for a series of bands: 0.2-0.6, 0.6-2.3, 2.3-5.0, 5.0-8.0, 0.5-2.0, 2.0-5.0, 0.2-0.5, 0.5-1, 1-2, 2-4.5 keV

{{attachment:eRO_ECF_apec_obs.png||width=500}}
{{attachment:eRO_ECF_apec_cor.png||width=500}}