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NGC 6221
Imaged by Martin S. Ferlito copyright
Gstar-EX Integrating Video Camera
Information provided by adsabs.harvard.edu

We present NGC 6221 as a case study of ``X-ray-loud composite galaxies,'' which appear similar to starbursts at optical wavelengths and resemble traditional active galactic nuclei in X-rays. The net optical spectrum of NGC 6221 is properly characterized as a starburst galaxy, but in X-rays, NGC 6221 is similar to Seyfert 1 galaxies, exhibiting a power-law continuum spectrum, a broad Fe Kα line, and continuum variability on timescales of days and years. High-resolution images reveal that the detected active nucleus is relatively weak, not only at optical, but also at near-infrared wavelengths. An obscuring starburst, in which the interstellar gas and dust associated with the starburst conceal the active nucleus, accounts for these peculiar features.

NGC 6221 Magnitude 10.8
Top Left NGC 6215 Magnitude 11.8
Top Right PGC 59124 Magnitude 15.2
Bottom Left NGC 6215A Magnitude 14.2
Imaged by Martin S. Ferlito copyright
Gstar-EX Integrating Video Camera




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