Products Overview
The webpage for each sequence number and each Obs ID is identified at the
top of the webpage by the source name, sequence number, and Obs ID.
Note: The first thing that you should do for a particular sequence
number and Obs ID that you are interested in, is to check the link
"Known Problems", situated just below the page title, to the left.
The user should also consult the literature
(for example, the Chandra
Bibliography Database) for work which may already have been
done on the data set(s) in question.
Below is a brief description of all the other data products available
from the webpage for each sequence and Obs ID. Further descriptions
of the data products are available by clicking on the name of the
data product from the webpage for every data set.
Information Table This contains a number of useful information
items for the particular astrophysical source in question, such as
coordinates, exposure time, count rates, fluxes, and the Galactic
column density.
Level 2 Events file Clean level 2 events file from which
lightcurves, spectra, and cross-dispersion profiles are derived.
Effective Area Plots "At-a-glance" first-order effective
areas, with and without the ACIS QE degradation correction.
Plots compare the - and + first orders with each other and
with the combined - and + first orders.
A tar file can be obtained
from the "Downloads" table which contains the actual ascii files
corresponding to the these plots.
Effective Area and Response Files A tar file can be obtained
from the "Downloads" table which contains the actual
telescope response files (ARFs) corresponding to the above plots,
as well as spectral redistribution matrices (RMFs). In addition,
second and third order files are also included, as well as the
so-called "pha2" file, which is a "Type II" FITS spectral file containing
12 spectra (the - and + 1st, 2nd, and 3rd orders for the MEG and HEG).
Again, ARF files are available both with and without the
ACIS QE degradation correction.
Lightcurve Plots "At-a-glance" first-order lightcurves,
from the MEG, HEG and also combined MEG and HEG. The lightcurves
for the separate - and + orders, as well as combined - and +
orders are available.
Lightcurve Files A tar file can be obtained
from the "Downloads" table which contains the actual
data in ascii format corresponding to the above plots.
Cross-dispersion Profiles "At-a-glance" first-order
cross-dispersion profiles from the MEG and HEG. Profiles for
the separate - and + orders, as well as the combined - and +
orders are available.
Cross-dispersion Profile Files
A tar file can be obtained
from the "Downloads" table which contains the actual
data in ascii format corresponding to the above plots.
Rest-frame Flux Spectra "At-a-glance" first-order
spectra for the MEG and HEG (separately), at two different
bin sizes. Plots are available with the photon flux plotted
against energy as well as wavelength. The spectra are NOT
corrected for Galactic absorption but are corrected for
cosmological redshift.
Observed-frame Flux Spectra & Very Simple XSPEC Model Files "At-a-glance"
first-order coarsely binned spectral plots for the MEG and HEG (separately).
A very simple model
(fitted in XSPEC) is also shown in some of the plots, and the
XSPEC model file is downloadable. These models principally
serve to calculate the observed fluxes, and are not meant to
be serious physical models of the data. It is the responsibility
of the user to fit detailed physical models to the data and
consult the literature
(e.g. the Chandra
Bibliographical Database) for work which may already have been done
in this respect for the data set in question.
Flux Spectral Files A tar file can be obtained
from the "Downloads" table (by clicking in "Ascii Spectra"),
which contains the actual
data in ascii format corresponding to the above plots, as well as
the XSPEC model files.
FITS Spectra and Responses #1 A tar file can be obtained
from the "Downloads" table which contains "Type I" FITS spectral
files and response files for the 1st order MEG and HEG
data, with various bin sizes.
The response files have the RMFs and ARFs combined into one file.
The spectra have the - and + orders combined, except for 4 files
corresponding to the separate - and + orders for the HEG and MEG.
FITS Spectra and Responses #2 A tar file can be obtained
from the "Downloads" table which contains the so-called
"pha2" file,
which is a "Type II" FITS spectral file containing
12 spectra (the - and + 1st, 2nd, and 3rd orders for the MEG and HEG).
Also included in this tar file are the 1st, 2nd, and 3rd order
spectral redistribution matrices
(RMFs) and the telescope response files (ARFs).
An additional 4 spectral FITS files are included which have
the - and + 1st orders separated for the MEG and HEG.