| Type |
Journal Article |
| Names |
R. E. A. Canning, A. C. Fabian, R. M. Johnstone, J. S. Sanders, C. J. Conselice, C. S. Crawford, J. S. Gallagher, E. Zweibel |
| Publication |
Monthly Notices of the Royal Astronomical Society |
| Volume |
405 |
| Issue |
1 |
| Pages |
115-128 |
| Date |
June 1, 2010 |
| URL |
http://adsabs.harvard.edu/abs/2010MNRAS.405..115C |
| Library Catalog |
NASA ADS |
| Abstract |
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 (~22kpc). These regions of extended star
formation trace the Hα filaments, drawn out by rising radio
bubbles. In both regions, bimodal distributions of colour (B -
R)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 108years
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. |
| Tags |
cooling flows, galaxies: clusters: individual: Perseus, galaxies: individual: NGC 1275, galaxies: star clusters |