Precision determination of corotation radii in galaxy disks: Tremaine-Weinberg v. Font-Beckman for NGC 3433

Abstract

Density waves in galaxy disks have been proposed over the years, in a variety of specific models, to explain spiral arm structure and its relation to the mass distribution, notably in barred galaxies. An important parameter in dynamical density wave theories is the corotation radius, the galactocentric distance at which the stars and gas rotate at the same speed as the quasi-static propagating density wave. Determining corotation, and the pattern speed of a bar have become relevant to tests of cosmologically based theories of galaxy evolution involving the dynamical braking of bars by interaction with dark matter haloes. Here comparing two methods, one of which measures the pattern speed and the other the radius of corotation, using two instruments (an integral field spectrometer and a Fabry-Perot interferometer) and using both the stellar and interstellar velocity fields, we have determined the bar corotation radius, and three further radii of corotation for the SAB(s)b galaxy NGC3433. The results of both methods, with both instruments, and with both disk components give excellent agreement. This strengthens our confidence in the value of the two methods, and offers good perspectives for quantitative tests of different theoretical models.

Article accepted for publication in ApJ. It contains 7 figures and 2 tables

References in corpus (5)

• A Classical Morphological Analysis of Galaxies in the Spitzer Survey of Stellar Structure in Galaxies (S4G)
• Ionized gas kinematics of galaxies in the CALIFA survey I: Velocity fields, kinematic parameters of the dominant component, and presence of kinematically distinct gaseous systems
• Kinematic clues to bar evolution for galaxies in the local universe: why the fastest rotating bars are rotating most slowly
• Tests of the Radial Tremaine-Weinberg Method
• The ratio of pattern speeds in double-barred galaxies

Cited by in corpus (12)

• A direct test of density wave theory in a grand-design spiral galaxy
• Relations among structural parameters in barred galaxies with a direct measurement of bar pattern speed
• Applying the Tremaine-Weinberg Method to Nearby Galaxies: Stellar Mass-Based Pattern Speeds, and Comparisons with ISM Kinematics
• Bar pattern speeds in CALIFA galaxies III. Solving the puzzle of ultrafast bars
• Spiral arm formation mechanisms: Spiral Structure in Barred galaxies. Observational constraints to spiral arm formation mechanisms
• Spin Parity of Spiral Galaxies I -- Corroborative Evidence for Trailing Spirals
• Testing the Tremaine-Weinberg Method Applied to Integral-field Spectroscopic Data Using a Simulated Barred Galaxy
• Instabilities in disc galaxies: from noise to grooves to spirals
• Resonance coupling in spiral arms: Patterns for flat rotation curve
• Morphology and kinematics of the gas in M51: How interaction with NGC5195 has moulded the structure of its arms
• A Comprehensive Analysis on the Nature of the Spiral Arms in NGC 3686, NGC 4321, and NGC 2403
• The Tremaine-Weinberg method at high redshifts