IUE MX Browse Files
Low dispersion spectra
Each IUE Browser page consist of an HTML page and one or more gzip
files containing extracted spectra. These spectra were obtained from the
MXLO files provided by the IUE
project.
The browse page is composed of one or two GIF images and some text. The
GIF files show the original, unsmoothed fluxes > 0. Data points with
quality flags < -512 are not
plotted. There are two images whenever spectra were obtained through
both the large and small apertures for the same image. The wavelength
coverage available, of the plots and the GZIP files are listed in the
table below.
|
SWP |
LWP* |
LWR* |
---|
Wavelength coverage |
1150-1978 Å |
1851-3347 Å |
1851-3348 Å |
---|
Wavelengths plotted |
1150-1978 Å |
1851-3200 Å |
1851-3200 Å |
---|
Wavelengths in GZIP files |
1150-1978 Å |
1851-3347 Å |
1851-3348 Å |
---|
*For the long wavelength cameras, data between 3200 and 3350
Å are not shown since the instrumental response and calibrations are
not very good in this region.
High dispersion spectra
This is composed of a GIF image and some text. The GIF files show a 4
point binned version of a combined order spectrum which has been placed
on a uniformly spaced wavelength grid with 0.05 Å spacing for the SWP
spectra and 0.1 Å for the LWP and LWR spectra. Thus, the resolution of
the browser images is either 0.2 or 0.4 Å. Points with quality flags <
-512 are not plotted. There is also a section of text which provides
information about the observation, including the target, the time, data
quality and processing information.
Each IUE Browser page consist of an HTML page a gzip file containing a
combined order extracted spectra. These spectra were obtained from the
MXHI files provided by the IUE project. This page explains the contents
of the browser files and how they were generated.
The spectra shown on the high dispersion browser pages and gzipped
files available for down-loading are combined order echelle data. The spectra were created using
IUEDAC software to combine most of the orders available in the
MXHI files to form a single, continuous spectrum.
Additional long wavelength
coverage is available in the full MXHI files but, because the
echellograms were not centered on the IUE detector, there are
large gaps in the coverage at these wavelengths and they are not
included in the browse files (see Table 1).
TABLE 1
|
SWP |
LWP |
LWR |
---|
Complete wavelength coverage |
1150-1930 Å |
1845-3105 Å |
1845-3105 Å |
---|
Partial wavelength coverage |
1930-2198 Å |
3105-3230 Å |
3105-3230 Å |
---|
Wavelength coverage shown |
1150-1975 Å |
1900-3125 Å |
1900-3125 Å |
---|
Orders shown |
70-120 |
74-121 |
74-121 |
---|
The IUE browse files were conceived and originally implemented by Dr. Derck Massa, Dr. Nancy Oliversen, and Ms. Patricia Lawton, then members of the GSFC Astrophyics Data Facility (ADF) staff under direction of Dr. Michael Van Steenberg. Some modifications have been made as part of the transition to MAST maintenance.