First DENIS I-band Extragalactic Catalog: 20,620 Southern Sky Galaxies

20,620 galaxies from the provisional extragalactic catalog constructed from the Deep Near Infrared Southern Sky Survey (DENIS). The catalog was created by NASA HEASARC in July 1999 using an automatic galaxy recognition program with an estimated efficiency better than 99%. It contains total I-band magnitude, isophotal diameter, axis ratio, position angle, and a rough morphological type code for each galaxy.

Use Cases

• Calibrating I-band photometry based on cross-identification with the Lyon-Meudon Extragalactic Database (LEDA).
• Analyzing galaxy morphological types based on the provided morphological type code.
• Studying galaxy size and orientation distributions based on isophotal diameter, axis ratio, and position angle.
• Assessing catalog completeness for galaxies up to a limiting I-band magnitude of 14.5.

Strengths

• Contains 20,620 galaxies, providing a substantial sample for analysis.
• Automatic recognition program efficiency is estimated to be better than 99%.
• Photometric accuracy for I-band magnitudes is 0.18 mag.
• Coordinates have a nominal accuracy of about 6 arcseconds.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Covers only 25% of the Southern sky, which may limit spatial analysis.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

NASA HEASARC, based on a machine-readable version from the CDS Data Center.

Collection Method

Created using an automatic galaxy recognition program based on a discriminating analysis of DENIS survey data.

Time Range

Based on data from the DENIS survey; catalog released in 1999.

Freshness

Last updated 2026-03-13 18:01:24.439272; freshness should be verified.

Geography

Southern sky.