Bibcode
Krishnarao, Dhanesh; Pace, Zachary J.; D'Onghia, Elena; Aguerri, J. Alfonso L.; McClure, Rachel L.; Peterken, Thomas; Fernández-Trincado, José G.; Merrifield, Michael; Masters, Karen L.; Garma-Oehmichen, Luis; Boardman, Nicholas Fraser; Bershady, Matthew; Drory, Niv; Lane, Richard R.
Bibliographical reference
The Astrophysical Journal
Advertised on:
4
2022
Journal
Citations
8
Refereed citations
6
Description
Bars may induce morphological features, such as rings, through their resonances. Previous studies suggested that the presence of "dark gaps," or regions of a galaxy where the difference between the surface brightness along the bar major axis and that along the bar minor axis is maximal, can be attributed to the location of bar corotation. Here, using GALAKOS, a high-resolution N-body simulation of a barred galaxy, we test this photometric method's ability to identify the bar corotation resonance. Contrary to previous work, our results indicate that "dark gaps" are a clear sign of the location of the 4:1 ultraharmonic resonance instead of bar corotation. Measurements of the bar corotation can indirectly be inferred using kinematic information, e.g., by measuring the shape of the rotation curve. We demonstrate our concept on a sample of 578 face-on barred galaxies with both imaging and integral field observations and find that the sample likely consists primarily of fast bars.
Related projects
Galaxy Evolution in Clusters of Galaxies
Galaxies in the universe can be located in different environments, some of them are isolated or in low density regions and they are usually called field galaxies. The others can be located in galaxy associations, going from loose groups to clusters or even superclusters of galaxies. One of the foremost challenges of the modern Astrophysics is to
Jairo
Méndez Abreu