Internal kinematics of the most luminous HII regions in M100

Bibcode
1998PASA...15..161S
DOI
10.1071/AS98161
Sabalisck, N. S. P.; Rozas, M.; Beckman, J. E.; Knapen, J. H.
Bibliographical reference

Publications Astronomical Society of Australia, vol. 15, no. 1, p. 161-62

Advertised on:
4
1998
Number of authors
4
IAC number of authors
0
Citations
1
Refereed citations
1
Description
We have used the TAURUS Fabry-Perot mapping spectrometer on the WHT to produce a complete kinematic map of the disc of M100 in H-alpha. Here we show how the internal velocity dispersion of the principal emission components of the brightest regions varies with their H-alpha luminosity. The plot shows ample scatter, but an upper envelope in the velocity dispersion is clearly linear (in the log-log plane) with a slope of 2.6, a result which agrees precisely with an earlier graph by Arsenault et al., who selected instead the regions of highest surface brightness. We show that this result, which differs from the conventional prediction from the virial theorem, is consistent with virialisation if the HII regions are density bounded and thus offers evidence in support of the density bounding hypothesis for the most luminous regions in disc galaxies.
Type
Non-refereed
Interstellar medium
Spiral galaxies

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