Observational Constraints on Correlated Star Formation and Active Galactic Nuclei in Late-stage Galaxy Mergers

被引:19
作者
Barrows, R. Scott [1 ]
Comerford, Julia M. [1 ]
Zakamska, Nadia L. [2 ]
Cooper, Michael C. [3 ]
机构
[1] Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA
[2] Johns Hopkins Univ, Dept Phys & Astron, Bloomberg Ctr, 3400 N Charles St, Baltimore, MD 21218 USA
[3] Univ Calif Irvine, Dept Phys & Astron, Ctr Galaxy Evolut, 4129 Frederick Reines Hall, Irvine, CA 92697 USA
关键词
galaxies: active; galaxies: evolution; galaxies: interactions; galaxies: Seyfert; galaxies: star formation; DIGITAL SKY SURVEY; SUPERMASSIVE BLACK-HOLES; HUBBLE-SPACE-TELESCOPE; ULTRALUMINOUS INFRARED GALAXIES; RADIAL COLOR GRADIENTS; RICH MINOR MERGERS; HOST GALAXIES; INTERACTING GALAXIES; ELLIPTIC GALAXIES; FORMATION HISTORY;
D O I
10.3847/1538-4357/aa93de
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Galaxy mergers are capable of triggering both star formation and active galactic nuclei (AGNs) and therefore may represent an important pathway in the co-evolution of galaxies and supermassive black holes (SMBHs). However, correlated enhancements of merger-induced star formation and AGN triggering may be hidden by the variable conditions and timescales during which they occur. In Paper I, we presented evidence of merger-triggered AGN in a sample of six. late-stage galaxy mergers (2-8 kpc nuclear separations). In this follow-up work, we use multiwavelength Hubble Space Telescope imaging and additional archival data to examine their star-forming properties to test for merger-triggered star formation and if it is correlated with SMBH growth. We find that the morphological asymmetries are correlated with enhanced specific star formation rates, indicating the presence of merger-triggered star formation. Additionally, the stellar populations become younger with increasing radius from the nucleus, indicating that the merger-induced star formation primarily occurs on global scales. However, we also find that the star formation rate enhancements are consistent with or lower than those of larger separation galaxy pair samples. This result is consistent with simulations predicting a decline of the global star formation rates in late-stage galaxy mergers with < 10 kpc nuclear separations. Finally, we find that enhancements in specific star formation rate and AGN luminosity are positively correlated, but that an average temporal delay of >= 10(8) years likely exists between the peak of global star formation and the onset of AGN triggering in 80% of the systems.
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页数:16
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