Constraining corotation from shocks in tightly-wound spiral galaxies

Abstract

We present a new method for estimating the corotation radius in tightly wound spiral galaxies, through analysis of the radial variation of the offset between arms traced by the potential (P-arms) and those traced by dust (D-arms). We have verified the predictions of semi-analytical theory through hydrodynamical simulations and have examined the uniqueness of the galactic parameters that can be deduced by this method. We find that if the range of angular offsets measured at different radii in a galaxy is greater than around pi/4, it is possible to locate the radius of corotation to within ~ 25%. We argue that the relative location of the P- and D-arms provides more robust constraints on the galactic parameters than can be inferred from regions of enhanced star formation (SF-arms), since interpretation of the latter involves uncertainties due to reddening and the assumed star formation law. We thus stress the importance of K-band studies of spiral galaxies.

Accepted for publication in MNRAS. 15 pages, 23 figures

References in corpus (11)

• Circumnuclear Dust in Nearby Active and Inactive Galaxies. I. Data
• The structure of spiral galaxies - II. Near-infrared properties of spiral arms
• Density Waves Inside Inner Lindblad Resonance: Nuclear Spirals in Disk Galaxies
• Two modes of gas flow in a single barred galaxy
• Dark matter within high surface brightness spiral galaxies
• Uncovering Spiral Structure in Flocculent Galaxies
• Dust Spirals and Acoustic Noise in the Nucleus of the Galaxy NGC 2207
• A Morphological Method to Determine Co-Rotation Radii in Spiral Galaxies
• Variation of Molecular Cloud Properties across the Spiral Arm in M 51
• Properties of disks and spiral arms along the Hubble sequence
• Near-infrared constraints on the driving mechanisms for spiral structure

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