The Kinematically Measured Pattern Speeds of NGC 2523 and NGC 4245

Abstract

We have applied the Tremaine-Weinberg continuity equation method to derive the bar pattern speed in the SB(r)b galaxy NGC 2523 and the SB(r)0/a galaxy NGC 4245 using the Calcium Triplet absorption lines. These galaxies were selected because they have strong inner rings which can be used as independent tracers of the pattern speed. The pattern speed of NGC 2523 is 26.4 $\pm$ 6.1 km s${}^{-1}$ kpc${}^{-1}$, assuming an inclination of 49.7${}^{\circ }$ and a distance of 51.0 Mpc. The pattern speed of NGC 4245 is 75.5 $\pm$ 31.3 km s${}^{-1}$ kpc${}^{-1}$, assuming an inclination of 35.4${}^{\circ }$ and a distance of 12.6 Mpc. The ratio of the corotation radius to the bar radius of NGC 2523 and NGC 4245 is 1.4 $\pm$ 0.3 and 1.1 $\pm$ 0.5, respectively. These values place the bright inner rings near and slightly inside the corotation radius, as predicted by barred galaxy theory. Within the uncertainties, both galaxies are found to have fast bars that likely indicate dark halos of low central concentration. The photometric properties, bar strengths, and disk stabilities of both galaxies are also discussed.

arXiv commentAccepted for publication in The Astronomical Journal, 11 figures, 2 tables

References in corpus (25)

• Stellar mass-to-light ratios and the Tully-Fisher relation
• Secular Evolution and the Formation of Pseudobulges in Disk Galaxies
• What determines the strength and the slowdown rate of bars ?
• Constraints from Dynamical Friction on the Dark Matter Content of Barred Galaxies
• The Frequency of Barred Spiral Galaxies in the Near-IR
• A Digital Archive of HI 21 cm Line Spectra of Optically-targeted Galaxies
• Multicomponent Decompositions for a Sample of S0 galaxies
• The global structure of galactic discs
• Bar strengths in spiral galaxies estimated from 2MASS images
• Measurement of fast bars in a sample of early-type barred galaxies
• Bar-induced perturbation strengths of the galaxies in the Ohio State University Bright Galaxy Survey (OSUBGS) I
• The pattern speed of the bar in NGC 936
• The Distribution of Bar and Spiral Strengths in Disk Galaxies
• A Fast Bar in the Post-Interaction Galaxy NGC 1023
• Direct Confirmation of Two Pattern Speeds in the Double Barred Galaxy NGC 2950
• Fourier Dissection of Early-Type Galaxy Bars
• Fabry-Perot Absorption-Line Spectroscopy of NGC 7079: Kinematics and Bar Pattern Speed
• A Morphological Method to Determine Co-Rotation Radii in Spiral Galaxies
• A Technique for Separating the Gravitational Torques of Bars and Spirals in Disk Galaxies
• On the relevance of the Tremaine-Weinberg method applied to H-alpha velocity field.Pattern speeds determination in M100 (NGC 4321)
• Rotational Widths for Use in the Tully-Fisher Relation. I. Long-slit Spectroscopic Data
• The Potential-Density Phase Shift Method for Determining the Corotation Radii in Spiral and Barred Galaxies
• Offsets between H-alpha and CO arms of a spiral galaxy NGC 4254: A New Method for Determining the Pattern Speed of Spiral Galaxies
• Model-independent measurements of bar pattern speeds
• The bar pattern speed of NGC 4431

Cited by in corpus (17)

• Secular Evolution and Structural Properties of Stellar Bars in Galaxies
• Bar pattern speeds in CALIFA galaxies: I. Fast bars across the Hubble sequence
• Model-based pattern speed estimates for 38 barred galaxies
• SDSS-IV MaNGA: pattern speeds of barred galaxies
• A numerical study of interactions and stellar bars
• Bar pattern speeds in CALIFA galaxies II. The case of weakly barred galaxies
• Galaxy Zoo: Kinematics of strongly and weakly barred galaxies
• Relations among structural parameters in barred galaxies with a direct measurement of bar pattern speed
• Ring Star Formation Rates in Barred and Nonbarred Galaxies
• The Gas Morphology of Nearby Star-Forming Galaxies
• Testing the Tremaine-Weinberg Method Applied to Integral-field Spectroscopic Data Using a Simulated Barred Galaxy
• The (black hole mass)-(color) relations for early- and late-type galaxies: red and blue sequences
• On the morphology of dust lanes in galactic bars
• Dynamical Simulations of NGC 2523 and NGC 4245
• Determination of resonance locations in NGC 613 from morphological arguments
• Bar instability and formation timescale across Toomre's $Q$ parameter and central mass concentration: slow bar formation or true stability
• Bulge properties and dark matter content of early-type barred galaxies