The kinematically measured pattern speeds of NGC 2523 and NGC 4245

Show simple item record Treuthardt, P. Buta, R. Salo, H. Laurikainen, E.
dc.contributor.other University of Alabama Tuscaloosa
dc.contributor.other University of Oulu 2019-06-13T19:49:33Z 2019-06-13T19:49:33Z 2007 2007-07-26
dc.identifier.citation Truethardt, P., Buta, R., Salo, H., Laurikainen, E. (2007): The Kinematically Measured Pattern Speeds of NGC 2523 and NGC 4245. The Astronomical Journal, 134(3). DOI: 10.1086/521149
dc.description.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 +/- 6.1 kms(-1) kpc(-1), assuming an inclination of 49.7 degrees and a distance of 51.0 Mpc. The pattern speed of NGC 4245 is 75.5 +/- 31.3 km s(-1) kpc(-1), assuming an inclination of 35.4 degrees 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 +/- 0.3 and 1.1 +/- 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. en_US
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher IOP Publishing
dc.subject galaxies : individual (NGC 2523, NGC 4245)
dc.subject galaxies : kinematics and dynamics
dc.subject galaxies : photometry
dc.subject galaxies : spiral
dc.subject DISK GALAXIES
dc.subject H-ALPHA
dc.subject BARS
dc.subject STRENGTHS
dc.subject ROTATION
dc.subject NGC-936
dc.subject Astronomy & Astrophysics
dc.title The kinematically measured pattern speeds of NGC 2523 and NGC 4245 en_US
dc.type text
dc.type Article
dc.rights.holder American Astronomical Society
dc.identifier.doi 10.1086/521149

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