An Improved Method for Determining the Integrated Properties of Nuclear Rings: NGC 1512

作者：Ma, Chao^*; de Grijs, Richard; Ho, Luis C.

来源：Astrophysical Journal, The - Supplement Series, 2017, 230(2): 14.

DOI：10.3847/1538-4365/aa709e

• galaxies: evolution
• galaxies: fundamental parameters
• galaxies: individual (NGC 1512)
• galaxies: star formation
• methods: observational

The integrated properties of nuclear rings are correlated with the secular evolution and dynamics of the host galaxies of the rings, as well as with the formation and evolution of the rings' star cluster population(s). Here we present a new method to accurately measure the spectral energy distribution and current star formation rate (SFR) of the nuclear ring in the barred spiral galaxy NGC 1512, based on high-resolution Hubble and Spitzer Space Telescope images. Image degradation does not have a significant negative effect on the robustness of the results. To obtain the ring's SFR for the period spanning similar to 3-10 Myr, we apply our method to the continuum-subtracted Ha and 8 mu m images. The resulting SFR surface density, Sigma,(SFR) = 0.09 M-circle dot yr(-1) kpc(-2), is much higher than the disk-averaged SFR densities in normal galaxies. We also estimate the ring's total stellar mass, log (M/M-circle dot)=7.1. +/-. 0.11, for an average age of similar to 40 Myr.

• 出版日期2017-6
• 单位北京大学