Title | Connections between Star Cluster Populations and Their Host Galaxy Nuclear Rings |
Authors | Ma, Chao de Grijs, Richard Ho, Luis C. |
Affiliation | Peking Univ, Dept Astron, Yi He Yuan Lu 5, Beijing 100871, Peoples R China. Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Lu 5, Beijing 100871, Peoples R China. Int Space Sci Inst Beijing, 1 Nanertiao, Beijing 100190, Peoples R China. Macquarie Univ, Dept Phys & Astron, Balaclava Rd, N Ryde, NSW 2109, Australia. Peking Univ, Dept Astron, Yi He Yuan Lu 5, Beijing 100871, Peoples R China. Ma, C (reprint author), Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Lu 5, Beijing 100871, Peoples R China. |
Keywords | galaxies: evolution galaxies: individual (NGC 1512) galaxies: star clusters: general galaxies: star formation globular clusters: general HUBBLE-SPACE-TELESCOPE CIRCUMNUCLEAR STARBURST RINGS EVOLUTIONARY SYNTHESIS MODELS BARRED SPIRAL GALAXIES INITIAL MASS FUNCTION SYSTEMATIC UNCERTAINTIES SECULAR EVOLUTION FORMATION HISTORY FORMING GALAXIES DISK GALAXIES |
Issue Date | 2018 |
Publisher | ASTROPHYSICAL JOURNAL |
Citation | ASTROPHYSICAL JOURNAL. 2018, 857(2). |
Abstract | Nuclear rings are excellent laboratories for probing diverse phenomena such as the formation and evolution of young massive star clusters and nuclear starbursts, as well as the secular evolution and dynamics of their host galaxies. We have compiled a sample of 17 galaxies with nuclear rings, which are well resolved by high-resolution Hubble and Spitzer Space Telescope imaging. For each nuclear ring, we identified the ring star cluster population, along with their physical properties (ages, masses, and extinction values). We also determined the integrated ring properties, including the average age, total stellar mass, and current star formation rate (SFR). We find that Sb-type galaxies tend to have the highest ring stellar mass fraction with respect to the host galaxy, and this parameter is correlated with the ring's SFR surface density. The ring SFRs are correlated with their stellar masses, which is reminiscent of the main sequence of star-forming galaxies. There are striking correlations between star-forming properties (i.e., SFR and SFR surface density) and nonaxisymmetric bar parameters, appearing to confirm previous inferences that strongly barred galaxies tend to have lower ring SFRs, although the ring star formation histories turn out to be significantly more complicated. Nuclear rings with higher stellar masses tend to be associated with lower cluster mass fractions, but there is no such relation for the ages of the rings. The two youngest nuclear rings in our sample, NGC 1512 and NGC 4314, which have the most extreme physical properties, represent the young extremity of the nuclear ring age distribution. |
URI | http://hdl.handle.net/20.500.11897/524265 |
ISSN | 0004-637X |
DOI | 10.3847/1538-4357/aab6b4 |
Indexed | SCI(E) |
Appears in Collections: | 物理学院 科维理天文与天体物理研究所 |