Mon. Not. R. Astron. Soc., 445, 1412-1423 (2014/December-1)
Two physical regimes for the giant HII regions and giant molecular clouds in the Antennae galaxies.
ZARAGOZA-CARDIEL J., FONT J., BECKMAN J.E., GARCIA-LORENZO B., ERROZ-FERRER S. and GUTIERREZ L.
Abstract (from CDS):
We have combined observations of the Antennae galaxies from the radio interferometer ALMA (Atacama Large Millimeter/submillimeter Array) and from the optical interferometer GHαFaS (Galaxy Hα Fabry-Perot System). The two sets of observations have comparable angular and spectral resolutions, enabling us to identify 142 giant molecular clouds (GMCs) and 303 HII regions. We have measured, and compared, their basic physical properties (radius, velocity dispersion, luminosity). For the HII regions, we find two physical regimes, one for masses >105.4M☉ of ionized gas, where the gas density increases with gas mass, the other for masses <105.4M☉ of ionized gas, where the gas density decreases with gas mass. For the GMCs, we find, in contrast to previous studies in other galaxies over a generally lower mass range of clouds, that the gas density increases with the total gas mass, hinting at two regimes for these clouds if we consider both sources of data. We also find that the GMC mass function has a break at 106.7M☉. Using the velocity dispersion measurements, we claim that the difference between the regimes is the nature of the dominant binding force. For the regions in the lower mass range, the dominant force is the external pressure, while in the higher mass range it is the internal gravity of the clouds. In the regime where gravity is dominant, the star formation rate, derived from the dust-corrected Hα luminosity, increases super-linearly with the velocity dispersion, and the gas density increases with the gas mass.
© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)
stars: formation - HII regions - galaxies: interactions - galaxies: kinematics and dynamics - galaxies: starburst
VizieR on-line data:
<Available at CDS (J/MNRAS/445/1412): gmc.dat hiireg.dat list.dat fits/*>
Table A1: [ZFB2014] HII NNN (Nos 1-303). Table A2: [ZFB2014] GMC NNN (Nos 1-142).
erratum vol. 446, art. 3776 (2015)
View the reference in ADS
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