A3 Vertaisarvioitu kirjan tai muun kokoomateoksen osa
BaLROG: The Influence of Bars on the Dynamical Structure in Nearby Galaxies
Tekijät: Marja K. Seidel, J. Falcón-Barroso, I. Martínez-Valpuesta, S. Díaz-García, E. Laurikainen, H. Salo, J. H. Knapen
Toimittaja: Ian Skillen, Marc Balcells, Scott C. Trager
Julkaisuvuosi: 2016
Kokoomateoksen nimi: Multi-Object Spectroscopy in the Next Decade: Big Questions, Large Surveys, and Wide Fields
Tietokannassa oleva lehden nimi: MULTI-OBJECT SPECTROSCOPY IN THE NEXT DECADE: BIG QUESTIONS, LARGE SURVEYS, AND WIDE FIELDS
Lehden akronyymi: ASTR SOC P
Sarjan nimi: Astronomical Society of the Pacific Conference Series
Vuosikerta: 507
Aloitussivu: 265
Lopetussivu: 268
Sivujen määrä: 4
ISBN: 978-1-58381-898-5
eISBN: 978-1-58381-899-2
Verkko-osoite: http://www.aspbooks.org/a/volumes/article_details/?paper_id=37877
Using the BaLROG (Bars in Low Redshift Optical Galaxies) sample of 16 morphologically distinct barred spirals, we constrain the influence of bars on nearby galaxies observationally. Our sample appears small compared to ongoing IFU surveys, but offers a tenfold sharper spatial resolution (similar to 100 pc) as each galaxy is a mosaic of several pointings observed with the IFU spectrograph SAURON. We demonstrate a correlation between the bar strength Q(b) determined from classical torque analysis using 3.6 mu m Spitzer (S(4)G) images, with Q(kin), a kinematic torque, calculated via our new method based solely on the kinematics. Using a large number of N-body simulations, we verify this correlation and the measurement of Qb. We also determine bar strengths from ionized gas kinematics and find that they are similar to 2.5 larger than those measured from stellar kinematics. Further, inner kinematic features related to bars as predicted by simulations seem to be stronger for stronger bars. We find a stellar angular momentum dip at 0.2 +/- 0.1 bar lengths. In these central regions, about half of our sample also exhibits an anti-correlation of h(3)-stellar velocity (v/sigma). An increased flattening of the stellar sigma gradient with increasing bar strength supports the notion of bar-induced orbit mixing. Our results constrain the spatial scales and magnitude of a kinematic influence of bar-driven secular evolution in present day galaxies.
