Access to the complete repository:
- Please note: we provide CASSIS for downloading individual,
optimally extracted IRS spectra to support scientific publication
using the best quality extractions available.
- Our limited hardware resources are not configured to provide for
downloading the database in bulk at this time.
- We welcome inquiries and collaborations on data-mining the full
collection with specific scientific objectives. Contact us.
Things to know before using the spectra:
- To date, only low-resolution spectra (SL & LL modules) are available.
- The default extraction method is selected according to source
extent to provide the best flux-calibrated, high signal to noise
spectrum. Point sources are processed with an optimal extraction using the
spatial PSF profile of the instrument. Extended sources
are processed using a tapered column extraction, in which the flux is integrated in
a spatial window adjusted to source extent and scaling with wavelength.
The present interface displays potential flags and warnings for a
given extraction. Nevertheless, we encourage first-time users to
follow this checklist (all the following options can be accessed via
the menu below each spectrum):
- Check the pipeline messages and warnings about the
detection level, source extent, contaminated background, etc...
- Examine the spatial profiles for each module/nod/order.
- Compare extraction methods (optimal extraction versus tapered column extraction).
- Compare background subtraction methods. Although the
pipeline chooses the best method, it is often instructive to compare
all methods.
- Read the known
issues & caveats for the present version of CASSIS.
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| Search by Object List |
Provide a text file containing one object name per line
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| Search by AORkey List |
Provide a text file containing one AORkey per line
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Note that spectral maps are not included in CASSIS. Furthermore, only intended sources are available, the serendipitous sources catalog is under development. |
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How to acknowledge CASSIS and the fundamental Spitzer papers:
Please acknowledge our efforts through a reference to:
"Cornell Atlas of Spitzer IRS Sources", Lebouteiller, V.,
Barry, D.J., Spoon, H.W.W., Bernard-Salas, J., Sloan, G.C., Houck, J.R., & Weedman, D., 2011, ApJS, 196, 8
Specify the AORkey(s) in your publications for easy reference to the corresponding spectra.
A footnote may also be used where appropriate:
The Cornell Atlas of Spitzer/IRS Sources (CASSIS) is a product of
the Infrared Science Center at Cornell University, supported by NASA and JPL.
The other references needed are the primary papers of Spitzer (Werner et al. 2004), the IRS instrument (Houck et al. 2004), and
possibly SMART (Higdon et al. 2004; Lebouteiller et al. 2010) (detailed citations here)
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