OverviewFLS Ancillary MMT/Hectospec data
accompany the paper Papovich et al. (2006),
AJ, in
press. IRSA serves the three primary
catalog/table data products and multi-part FITS
spectra files from the FLS Ancillary
MMT/Hectospec second data release (v2),
using spatial searches in Atlas. IRSA has created
additional browse products, including spectra
previews and ASCII spectrum table files for all
MMT/Hectospec data. These browse products are
available from Atlas search results, through
additional columns in the FLS MMT/Hectospec
Spectroscopic Catalog (fls_v2.mmt_spectra.tbl),
described below. For more information on the
catalog format and column desciptions, click
here.
Accessing IRSA's MMT/Hectospec Browse
ProductsRun a spatial query on the
FLS_HECTOSPEC data using Atlas. Search
results show source position footprints on a
background sky image, along with a list of
sources for each of the FLS_HECTOSPEC catalogs
for which the search was successful. If your
search results include entries in the FLS
MMT/Hectospec Spectroscopic Catalog
(fls_v2.mmt_spectra.tbl), click on the catalog to
access IRSA's MMT/Hectospec browse products. HTML
links to four browse products have been added to
the last four columns in the table:
- The first link, Spec_Preview, is a
spectrum preview binned by a factor of 11 in
wavelength. Binning was done in order to try to
match the spectra in Papovich et al. (2006),
AJ, in
press [Figures 4 and 7]. Please note that
masking of bad pixels has not been done to the
IRSA preview spectra, but has been done to the
spectra plotted in the publication. For more
information on how IRSA created the spectra
preview files, please see section
below.
- The second link,
Spec_ascii_table_nobinning, is an ASCII
file, in IPAC table format, of the Wavelength
and Flux of the spectrum, without wavelength
binning. The information was extracted from
from the multi-part FITS image, matching the
FIELD and FIBER number to the correct FITS
image and row number, respectively, from
extensions 0 [Wavelength] and 1 [Flux].
- The third link,
Spec_ascii_table_binned, is an ASCII
file, in IPAC table format, of the Wavelegth
and Flux of the spectrum, with wavelength
binning factor of 11. The information was
extracted from from the multi-part FITS image,
matching the FIELD and FIBER number to the
correct FITS image and row number,
respectively, from extensions 0 [Wavelength]
and 1 [Flux].
- The fourth link,
Hectospec_multipart_FITS, is the
multi-part FITS file which holds the
spectra-related data for this catalog row
entry.
Creating ASCII spectra tables and spectra
previewsFLS MMT/Hectospec spectra preview
plots were created using the multi-part FITS
images for each of the 5 FIELDs (spHect-131,
spHect-132, spHect-133, spHect-134 and
spHect-135), per FIBER number (FITS image row
number), from extensions 0 [Wavelength] and 1
[Flux].
FTOOLS and IRAF were used to
extract the values from the FITS files in order
to create ASCII spectra in IPAC table format:
- FTOOL 'fextract' pulled extensions 0
and 1 into separate FITS images from the
original multi-part FITS files [output:
ext0.fits, ext1.fits]
- FTOOL 'fimgbin' binned FITS images
by a factor of 11 into new FITS images
[output: ext0bin.fits,
ext1bin.fits]
- IRAF 'listpix' created ASCII pixel
files for both sets of FITS images [binned
output: ext0bin.lis, ext1bin.lis;
unbinned output: ext0.lis,
ext1.lis]
- A Unix script was used to "grep" the
row/FIELD number from the ASCII pixel list
files, and "paste" the ext0 and ext1 single
column data into an ASCII two-column table file
of wavelength and flux. Formatting and header
information was added to conform to the IPAC
table format. This process was done for both
the binned and unbinned datasets.
[output:
spHect-FIELD#-0300_row#_spec_nobin.tbl,
spHect-FIELD#-0300_row#_spec.tbl]
- GNU graph was used to create gif
plots of the binned ASCII spectra files
The naming scheme for each file is broken
down below:
- The prefix "spHect-"
- the FIELD number (131, 132, 133, 134, or
135)
- The image "row" number (FIBER number)
- One of the following suffixes:
- "_spec.gif" (binned spectra)
- "_spec_nobin.gif" (unbinned
spectra)
- "_spec.tbl" (binned ASCII table)
- "_spec_nobin.tbl" (unbinned ASCII
table)
To access all the FLS MMT/Hectospec
spectra previews, click here.
To access all the FLS MMT/Hectospec
ASCII spectra tables, click here.
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