Spitzer Extragalactic First Look Survey: Line Ratios and Extinction Catalog

The Spitzer Extragalactic First Look Survey catalog presents line ratio and extinction measurements from WIYN/Hydra spectra. The survey comprises 4 square degrees of mid-infrared imaging from the Spitzer Space Telescope, aimed at characterizing extragalactic sources. The catalog was produced by the National Aeronautics and Space Administration, with supporting data described in Marleau et al. (2007).

Use Cases

• Characterize extragalactic source populations based on mid-infrared imaging down to sub-millijansky levels.
• Study galaxy evolution and star formation using line ratio measurements from optical spectra.
• Model interstellar dust and gas properties based on extinction measurements.
• Cross-reference extragalactic objects with ancillary data from ground-based optical and radio telescopes.

Strengths

• Imaging covers 4 square degrees of the sky, providing a substantial survey area.
• Data was collected during a dedicated 67-hour observation period with the Spitzer Space Telescope.
• Includes ancillary data from multiple ground-based optical and radio telescopes.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect temporal bias inherent to the specific 2003-2007 observation period.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Observational data from the Spitzer Space Telescope's MIPS and IRAC instruments, supplemented by ground-based WIYN/Hydra spectra.

Time Range

Observations made after Science Verification in late November 2003.

Freshness

Last updated 2026-03-13 19:33:17.376148; freshness should be verified.

Geography

Centered at celestial coordinates J1718+5930.