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| Paper: |
Are Stars Being Formed in the Halo of NGC 253? |
| Volume: |
230, Galaxy Disks and Disk Galaxies |
| Page: |
309 |
| Authors: |
Comerón, F.; Wickramasinghe, T.; Torra, J.; Méndez, R. A.; Gómez, A. E. |
| Abstract: |
We report on an excess of blue objects in a deep UBV survey of the halo of NGC 253 that may be early-type population I stars at distances ranging from 2.5 to 18 kpc from the plane of the galaxy. Their number is well above expectations derived from both source count models and direct observations of two nearby control fields. The objects closer to the plane of NGC 253 may be runaway stars ejected from its disk, but such explanation is not viable for the more distant objects, which appear to form a spatially distinct group and may have been formed in the halo. The existence of a powerful central starburst in NGC 253 reinforces the evidence, already suspected from observations of other galaxies with strong central activity, that massive outflows from galactic centers may trigger star formation in halos. |
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