Journal Article

Star formation in the outer filaments of NGC 1275

R. E. A. Canning, A. C. Fabian, R. M. Johnstone, J. S. Sanders, C. J. Conselice, C. S. Crawford, J. S. Gallagher and E. Zweibel

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 405, issue 1, pages 115-128
Published in print June 2010 | ISSN: 0035-8711
Published online June 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16474.x
Star formation in the outer filaments of NGC 1275

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We present photometry of the outer star clusters in NGC 1275, the brightest galaxy in the Perseus cluster. The observations were taken using the Hubble Space Telescope Advanced Camera for Surveys. We focus on two stellar regions in the south and south-east, far from the nucleus of the low-velocity system (∼22 kpc). These regions of extended star formation trace the Hα filaments, drawn out by rising radio bubbles. In both regions, bimodal distributions of colour (BR)0 against magnitude are apparent, suggesting two populations of star clusters with different ages; most of the Hα filaments show no detectable star formation. The younger, bluer population is found to be concentrated along the filaments while the older population is dispersed evenly about the galaxy. We construct colour–magnitude diagrams and derive ages of at most 108 years for the younger population, a factor of 10 younger than the young population of star clusters in the inner regions of NGC 1275. We conclude that a formation mechanism or event different to that for the young inner population is needed to explain the outer star clusters and suggest that formation from the filaments, triggered by a buoyant radio bubble rising either above or below these filaments, is the most likely mechanism.

Keywords: galaxies: clusters: individual: Perseus; cooling flows; galaxies: individual: NGC 1275; galaxies: star clusters

Journal Article.  9307 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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