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24 April 2024 |
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High Mass, OB Star Formation in M51 : HST Halpha and Palpha Imaging | | N. Z. Scoville
; M. Polletta
; S. Ewald
; S. R. Stolovy
; R. Thompson
; M. Rieke
; | | Date: |
15 Aug 2001 | | Subject: | astro-ph | | Affiliation: | California Institute of Technology),M. Polletta (California Institute of Technology and Observatory of Geneva), S. Ewald, S. R. Stolovy (California Institute of Technology), R. Thompson and M. Rieke (Steward Observatory, University of Arizona | | Abstract: | (first paragraph) We have obtained Halpha and Palpha emission line images covering the central 3 - 4 arcmin of M51 using the WFPC2 and NICMOS cameras on HST to study the high-mass stellar population. The 0.1 - 0.2 arcsec pixels provide 4.6 - 9 pc resolution in M51 and the Halpha/Palpha line ratios are used to obtain extinction estimates. A sample of 1373 Halpha emission regions is catalogued using an automated and uniform measurement algorithm. Their sizes are typically 10 - 100 pc. The luminosity function for the Halpha emission regions is obtained over the range L_{Halpha} = 10^{36} to 2 times 10^{39} erg s{-1}. The luminosity function is fit well by a power law with dN/dlnL proportional to L^{-1.01}). The power law is significantly truncated and no regions were found with observed L_{Halpha} above 2 times 10^{39} erg s^{-1} (uncorrected for extinction; the maximum seen in ground-based studies is approximately a factor of 5 higher, very likely due to blending of multiple regions). The extinctions derived here increase the maximum intrinsic luminosity to above 10^{40} erg s^{-1}). The logarithmically binned luminosity function is also somewhat steeper (alpha = -1.01) than that found ground-based imaging (alpha = -0.5 to -0.8) - probably also a result of our resolving regions which were blended in the ground-based images. The 2-point correlation function for the HII regions exhibits strong clustering on scales <= 2 arcsec or 96 pc. | | Source: | arXiv, astro-ph/0108248 | | Services: | Forum | Review | PDF | Favorites | |
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