Ongoing massive star formation in the bulge of M51

Details Ongoing massive star formation in the bulge of M51 Ongoing massive star formation in the bulge of M51

2001-12-03

arxiv.org/abs/astro-ph/0112034v1

Astronomy and Astrophysics

Astrophysics

28 pages, 7 PostScript figures, uses aaspp4.sty and epsfig.sty. Accepted for publication in ApJ, V566, February 20, 2002

Scientific paper

10.1086/338273

We studied the HST-WFPC2 observations of the inner kpc of the interacting galaxy M51 in six bands from 2550 to 8140 Angstrom. The images show an oval shaped area ("bulge") of 11x16 arcsec or 450x650 pc around the nucleus, dominated by a smooth population of old stars with overimposed dust lanes. We found 30 bright point-like sources in the bulge of M51; many of these are bright in the UV. They are located in elongated "strings" which follow the general pattern of the dust lanes. The spectral energy distributions of the pointsources are compared with those of clusters or single stars. We present arguments that the pointsources are isolated massive stars or small groups of a few massive stars. The energy distributions are best fitted with those of single stars with 4000

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