Relations among structural parameters in barred galaxies with a direct measurement of bar pattern speed
| Autor: | Victor P. Debattista, Enrico Maria Corsini, Virginia Cuomo, J. A. L. Aguerri |
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| Rok vydání: | 2020 |
| Předmět: |
Galaxies: general
Angular momentum Galaxies: statistics Bar (music) FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Rotation 01 natural sciences Galaxies: evolution Galaxies: kinematics and dynamics Galaxies: structure Luminosity 0103 physical sciences Turn (geometry) 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics High Energy Physics::Phenomenology Astronomy and Astrophysics Radius Astrophysics - Astrophysics of Galaxies Galaxy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Magnitude (astronomy) High Energy Physics::Experiment Astrophysics::Earth and Planetary Astrophysics |
| DOI: | 10.48550/arxiv.2003.07455 |
| Popis: | We investigate the relations between the properties of bars and their host galaxies in a sample of 77 nearby barred galaxies, spanning a wide range of morphological types and luminosities, with 34 SB0-SBa and 43 SBab-SBc galaxies. The sample includes all the galaxies with reliable direct measurement of their bar pattern speed based on long-slit or integral-field stellar spectroscopy using the Tremaine-Weinberg method. We limited our analysis to the galaxies with a relatively small relative error on the bar pattern speed (smaller than 50 per cent) and not hosting an ultrafast bar. For each galaxy, we collected the radius, strength, pattern speed, corotation radius, and rotation rate for the bar and we also collected the Hubble type and absolute SDSS r-band magnitude. We also used literature bulge-to-total luminosity ratio for a subsample of 53 galaxies with an available photometric decomposition. We confirmed earlier observational findings that longer bars rotate with lower bar pattern speeds, shorter bars are weaker, and bars with a small bar rotation rate rotate with higher bar pattern speeds and have smaller corotation radii. In addition, we found that stronger bars rotate with lower bar pattern speeds, as predicted from the interchange of angular momentum during bar evolution, which in turn may depend on different galaxy properties. Moreover, we report that brighter galaxies host longer bars, which rotate with lower bar pattern speeds and have larger corotation radii. This result is in agreement with a scenario of downsizing in bar formation, if more massive galaxies formed earlier and had sufficient time to slow down, grow in length, and push corotation outwards. Comment: revised and accepted for pubblication in Astronomy & Astrophysics |
| Databáze: | OpenAIRE |
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