ON THE LAST 10 BILLION YEARS OF STELLAR MASS GROWTH IN STAR-FORMING GALAXIES

被引:145
作者
Leitner, Samuel N. [1 ,2 ,3 ]
机构
[1] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA
[2] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA
[3] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
关键词
galaxies: dwarf; galaxies: evolution; galaxies: formation; galaxies: statistics; galaxies: stellar content; galaxies: structure; Galaxy: formation; DIGITAL SKY SURVEY; INFRARED-RADIO CORRELATION; LESS-THAN; SPECTRAL ENERGY-DISTRIBUTION; COLOR-MAGNITUDE DIAGRAM; AEGIS FIELD GALAXIES; K-SELECTED GALAXIES; SIMILAR-TO; 2.5; FORMATION HISTORY; FORMATION RATES;
D O I
10.1088/0004-637X/745/2/149
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The star formation rate-stellar mass relation (SFR-M-*) and its evolution (i.e., the SFR main sequence) describe the growth rate of galaxies of a given stellar mass and at a given redshift. Assuming that present-day star-forming galaxies (SFGs) were always star forming in the past, these growth rate observations can be integrated to calculate average star formation histories (SFHs). Using this Main Sequence Integration (MSI) approach, we trace present-day massive SFGs back to when they were 10%-20% of their current stellar mass. The integration is robust throughout those epochs: the SFR data underpinning our calculations are consistent with the evolution of stellar mass density in this regime. Analytic approximations to these SFHs are provided. Integration-based results reaffirm previous suggestions that current SFGs formed virtually all of their stellar mass at z < 2. It follows that massive galaxies observed at z > 2 are not the typical progenitors of SFGs today. We also check MSI-based SFHs against those inferred from analysis of the fossil record-from spectral energy distributions (SEDs) of SFGs in the Sloan Digital Sky Survey and color-magnitude diagrams (CMDs) of resolved stars in dwarf irregular galaxies. Once stellar population age uncertainties are accounted for, the main sequence is in excellent agreement with SED-based SFHs (from VESPA). Extrapolating SFR main sequence observations to dwarf galaxies, we find differences between MSI results and SFHs from CMD analysis of Advanced Camera for Surveys Nearby Galaxy Survey Treasury and Local Group galaxies. Resolved dwarfs appear to grow much slower than main sequence trends imply, and also slower than slightly higher mass SED-analyzed galaxies. This difference may signal problems with SFH determinations, but it may also signal a shift in star formation trends at the lowest stellar masses.
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页数:16
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