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High-resolution CO Survey of Virgo Spirals at Nobeyama — Massive Cores inferred from Central Rotation Curves

Published online by Cambridge University Press:  26 May 2016

Y. Sofue ,
H. Nakanishi ,
S. Onodera ,
J. Koda  and
K. Kohno
Y. Sofue
Affiliation:
Inst. Astro., Univ. Tokyo, Japan
H. Nakanishi
Affiliation:
Inst. Astro., Univ. Tokyo, Japan
S. Onodera
Affiliation:
Inst. Astro., Univ. Tokyo, Japan
J. Koda
Affiliation:
Nobeyama Radio Observatory, NAOJ, Japan Caltech, USA
K. Kohno
Affiliation:
Inst. Astro., Univ. Tokyo, Japan

Abstract

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We present the results of a high-resolution CO-line survey using the Nobeyama Millimeter-wave Array at high-angular (⋐ 2–3″) and high spectral resolutions for the 15 CO-richest Virgo spirals. We derived exact rotation curves using position-velocity diagrams by applying the iteration method. the obtained RCs rise steeply in the central 100 pc. Surface-mass-density distributions by direct deconvolution of the RCs show massive cores of ⋐ 109M⊙ within 100 pc, suggesting the existence of DM cusps in the centres. Five galaxies were found to nest single-peaked extremely high-density molecular cores, where star formation is currently suppressed by the high differential rotation. We show that the deeper is the gravitational potential, the higher is the central gas density.

Type
Part 9: Disks
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 319 - 320
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Sofue, Y., Koda, J., Nakanishi, H., et al. 2003a, PASJ, 55, 17.Google Scholar
Sofue, Y., Koda, J., Nakanishi, H., & Onodera, S. 2003b, PASJ, 55, 59.Google Scholar