Laser Illuminates Compact Galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Lick laser adaptive optics (AO) images of 6 low-redshift luminous compact blue galaxies were obtained in the H and K bands. The near-IR morphologies range from disky to irregular and include one possible galaxy merger. For one of the irregular galaxies, we combine the AO data with HST far-ultraviolet (FUV) STIS imaging and do stellar population synthesis modeling of the sub-arcsec structure. We find a string of compact knots in the STIS image with the brightest knot roughly 10 times brighter than 30 Doradus, indicating a recent major star-forming event. This structure is seen in the near-IR AO images which also contain an even larger red concentration that is undetected in the FUV. The stellar population synthesis models indicate that the red concentration is significantly older than the blue knot. One possible explanation for the observations is a recurrent burst history for this object.

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