Resolving cosmic star formation histories of present-day bulges, disks, and spheroids with ProFuse
arXiv (Cornell University)(2023)
摘要
We present the first look at star formation histories of galaxy components
using ProFuse, a new technique to model the 2D distribution of light across
multiple wavelengths using simultaneous spectral and spatial fitting of purely
imaging data. We present a number of methods to classify galaxies
structurally/morphologically, showing the similarities and discrepancies
between these schemes. We show the variation in component-wise mass functions
that can occur simply due to the use of a different classification method,
which is most dramatic in separating bulges and spheroids. Rather than
identifying the best-performing scheme, we use the spread of classifications to
quantify uncertainty in our results. We study the cosmic star formation history
(CSFH), forensically derived using ProFuse with a sample of 7,000 galaxies
from the Galaxy And Mass Assembly (GAMA) survey. Remarkably, the forensic CSFH
recovered via both our method (ProFuse) and traditional SED fitting (ProSpect)
are not only exactly consistent with each other over the past 8 Gyr, but also
with the in-situ CSFH measured using ProSpect. Furthermore, we separate the
CSFH by contributions from spheroids, bulges and disks. While the vast majority
(70
that 50
spheroids, and present-day bulges are composed of stars that were primarily
formed in the very early Universe, with half their stars already formed 12 Gyr
ago.
更多查看译文
关键词
cosmic star formation histories,spheroids,disks
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要