Internal turbulence, viriality, and density bounding of the most luminous H II regions in the spiral galaxy M 100

Details Internal turbulence, viriality, and density bounding of the most luminous H II regions in the spiral galaxy M 100 Internal turbulence, viriality, and density bounding of the most luminous H II regions in the spiral galaxy M 100

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...338...15r&link_type=abstract

Astronomy and Astrophysics, v.338, p.15-26 (1998)

Astronomy and Astrophysics

Astrophysics

26

Ism: Hii Regions, Galaxies: Individual: M100, Galaxies: Spiral, Galaxies: Structure, Galaxies: Ism

Scientific paper

We present TAURUS Fabry-Perot velocity data in Hα emission of the disc of the grand design spiral M 100 (NGC 4321). We have studied the emission spectra of the 200 H ii regions most luminous in Hα, calibrated in luminosity using photometric Hα imaging from the literature. The emission spectra of individual H ii regions were fitted using one or more Gaussian functions, and analyzed in terms of their velocity dispersion. We concentrate on the question of whether the emission lines show values of their internal velocity dispersions of H ii regions which would be predicted from the virial theorem, and find that in general this is not the case. There is a systematic trend to super-virial line widths, characteristic of the non-equilibrium effects of powerful OB stellar winds, and supernovae. We propose that the lower envelope in velocity dispersion sigma , in the plot of Hα luminosity v. sigma represents the virialized regions, and give a tentative theoretical explanation for its slope of 2.6 in the log-log plane, in terms of density bounding for the regions of highest luminosity.

Affiliated with

Also associated with

No associations

Rating

Internal turbulence, viriality, and density bounding of the most luminous H II regions in the spiral galaxy M 100 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Internal turbulence, viriality, and density bounding of the most luminous H II regions in the spiral galaxy M 100, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Internal turbulence, viriality, and density bounding of the most luminous H II regions in the spiral galaxy M 100 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1717838