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arXiv · astro-ph/9811192

Single CO Peak in NGC 5850

S. Leon·F. Combes·D. Friedli
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Abstract

NGC 5850 is a prototype of double-barred galaxy (Friedli et al. 1996) classified as SBb(sr) I-II (Higdon et al. 1998; Prieto et al. 1997). This kind of system is primordial to understand the physical mechanism responsible for feeding galaxy nuclei and boost the star formation rate. The CO(1-0) emission has been mapped in NGC 5850, i) in the very center, using the IRAM Plateau de Bure interferometer, to reach a 2.4\arcsec$\times$1.5\arcsec\ (PA$=$$-165^\circ$) spatial resolution, and ii) in the primary bar with the IRAM-30m telescope, with a 22\arcsec beam. We have found CO emission in the center of NGC 5850, located in a single peak on the northern part of the nuclear ring. The high velocity dispersion of the molecular gas may prevent star formation in that region. Gas simulations performed with a single bar pattern and without the tidal influence of the companion NGC 5846 are unable to reproduce the features observed in NGC 5850 (Combes, Leon, Friedli & Buta 1998, in preparation). The decoupling of a second bar appears necessary. The presence of the single molecular peak could be due to an $m=1$ mode excited by the massive companion.

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S. Leon, F. Combes, D. Friedli. 1998-11-12. Single CO Peak in NGC 5850. https://arxiv.org/abs/astro-ph/9811192

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