Tests of the grating rmfs and arfs

Here are the results for my testing for the grating RMFs and ARFs. I've included a few of the fits for the HEG & MEG.
Note that the widths are Gaussian sigma. The plots of the grating resolving power using the RMF are done by Chris
Baluta and the details of the plots and the description of how the ARFs and RMFs were made are given below the
figures.

HEG
RMF:acisheg1D1999-09-22rmfN0000.fits
ARF: acisheg-1D1999-09-22arfN0000.fits

Grating	Input Energy (keV)	Output energy(keV)	Error	width(keV)	Error
HEG	0.80	0.80	1.e-5	1.89e-4	1.76e-6
HEG	2.00	2.00	1.e-5	1.15e-3	7.50e-6
HEG	6.40	6.40	1.E-5	1.87e-2	1.11e-4

RMF: acisheg2D1999-09-22rmfN0000.fits
ARF: acisheg-2D1999-09-22arfN0000.fits

Grating	Input Energy (keV)	Output energy(keV)	Error	width(keV)	Error
HEG	2.00	2.00	1.e-5	6.22e-4	4.30e-7
HEG	6.40	6.40	1.E-5	9.17e-3	1.11e-4

RMF: acisheg3D1999-09-22rmfN0000.fits
ARF: acisheg-3D1999-09-22arfN0000.fits

Grating	Input Energy (keV)	Output energy(keV)	Error	width(keV)	Error
HEG	2.00	2.00	1.e-5	3.04e-4	2.65e-7
HEG	6.40	6.40	1.E-5	6.19e-3	6.00e-7

MEG

RMF: acismeg1D1999-09-22rmfN0000.fits
ARF: acismeg-1D1999-09-22arfN0000.fits

Grating	Input Energy (keV)	Output energy(keV)	Error	width(keV)	Error
MEG	0.57	0.57	1.e-5	1.82e-4	8.50e-8
MEG	0.80	0.80	1.e-5	3.51e-4	9.00e-8
MEG	2.00	2.00	1.e-5	1.80e-3	2.50e-7
HEG	6.40	6.40	1.E-5	1.53e-2	1.21e-4

RMF:

Resolution plots

Description and Caveats

ARFs

The heg and meg arfs in this directory were generated via the
following sequence:

      (1) an aspect histogram was generated via mkasphist;
          the data used to generate the histogram came from
          obsid 1235 (Capella)

(2) mkgarf was then run for each of the 6 ACIS-S chips
for each grating, for m=-3, -2, -1, 1, 2, 3

      (3) the arfs for each order were then summed over all
          6 chips, generating the final arf for the given
          grating

o The heg/meg arfs were generated for the source at the nominal aim-point
on ACIS-S3

    NOTE:: The leg arfs were extracted from the Type II .arf file
           hrcs042798436N000_letg_rsp2.fits. THIS FILE HAS NOT HAD
           DITHER TAKEN INTO ACCOUNT!!

CAVEATS:

   - Only brief testing has been done; the arfs were read into
     XSPEC along with the corresponding rmf; XSPEC was able to
     generate a "fak" dataset using these arf/rmf combinations,
     but I did not do any other analysis and only tried this
     for a few of the arfs

- keywords needed to be patched in by hand; there may thus be
a few missing

-- CB, 9/24/99

RMFs

990924 Preliminary grating RMFs (unverified)

<instrument><grating><order>D1999-09-DDrmfN0000.fits

The response matrices in this directory were generated
using a Gaussian model for the LSF. In the case of the heg
and the meg, the gaussian parameters were derived from
MARX simulations. The leg data were derived from the file

http://asc.harvard.edu/cal/Links/Letg/Cip/letgD1996-11-01res_optN0002.rdb

These matrices are redistribution only, and they have been
normalized to 1.0.

They have been tested in XSPEC and have performed well,
though the user is warned that they were not subjected
to rigorous testing. The heg_res.ps and meg_res.ps files
give plots of the measured E/dE values versus "real" data
(the line). The values were measured from gaussian fits
to output from XSPEC fakeit, using a delta-function input
model. The (one) diamond is a second-order fit while the
(one) triangle is a third-order fit.

LETG rmfs
---------
hrcleg1D1999-0923rmfN0000.fits
hrcleg2D1999-0923rmfN0000.fits
hrcleg3D1999-0923rmfN0000.fits

HEG
---
acisheg1D1999-09-22rmfN0000.fits
acisheg2D1999-09-22rmfN0000.fits
acisheg3D1999-09-22rmfN0000.fits

MEG
---
acismeg2D1999-09-22rmfN0000.fits
acismeg3D1999-09-22rmfN0000.fits

These may be used for both plus and minus orders.

-- CB, 9/24/99