Montage Used To Search for Tidal Streams Around Galaxies

In a recent paper submitted to Astronomy and Astrophysics,  Miskolczi, Bomans and Dettmar have used Montage in their project to search for low surface brightness tidal structures around a sample of 474 galaxies in the Sloan Digital Sky Survey DR7 archive. Their study was motivated by the prediction of models of hierarchical structure formation that smaller satellite galaxies accrete onto more massive systems.  Smaller companions then disintegrate, and the evidence can be seen in tidal streams.

Examples of faint features in SDSS DR7 galaxy images after processing by Miskolczi et al.

Examples of faint features in SDSS DR7 galaxy images after processing by Miskolczi et al.

They used several tools: Montage to create mosaics and the IRAF image stacking utility to combine them, and SExtractor to remove point sources. This process extracted structures at surface brightness levels ranging from ∼ 24 down to 28 mag arcsec. Nineteen per cent of galaxies show faint features, and at least 6% show evidence of streams.

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This entry was posted in astronomy, astronomy images, galaxies, Image mosaic, Image processing, Images, software, tidal interactions and tagged , , , , , , . Bookmark the permalink.

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