Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 479, Issue 2, Pages 1433-1464Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1638
Keywords
galaxies: distances and redshifts; galaxies: haloes; galaxies: interactions; galaxies: starburst; galaxies: star formation; galaxies: statistics
Categories
Funding
- CONICYT-Chile [FONDECYT 3160492]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [707693]
- European Research Council [DEGAS-259586]
- Royal Society
- Science and Technology Facilities Council [ST/L00075X/1]
- NSF [AST-1612085]
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- STFC capital grant [ST/K00087X/1]
- DiRAC Operations grant [ST/K003267/1]
- Durham University
- STFC (UK)
- ARC (Australia)
- AAO
- Marie Curie Actions (MSCA) [707693] Funding Source: Marie Curie Actions (MSCA)
- STFC [ST/R000832/1, ST/L005042/1, ST/J004650/1, ST/P002293/1, ST/R002371/1, ST/P000541/1, ST/I00162X/1] Funding Source: UKRI
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Statistical studies of galaxy-galaxy interactions often utilize net change in physical properties of progenitors as a function of the separation between their nuclei to trace both the strength and the observable time-scale of their interaction. In this study, we use two-point auto-, cross-, and mark-correlation functions to investigate the extent to which small-scale clustering properties of star-forming galaxies can be used to gain physical insight into galaxy-galaxy interactions between galaxies of similar optical brightness and stellar mass. The H alpha star formers, drawn from the highly spatially complete Galaxy And Mass Assembly (GAMA) survey, show an increase in clustering at small separations. Moreover, the clustering strength shows a strong dependence on optical brightness and stellar mass, where (1) the clustering amplitude of optically brighter galaxies at a given separation is larger than that of optically fainter systems, (2) the small-scale-clustering properties (e.g. the strength, the scale at which the signal relative to the fiducial power law plateaus) of star-forming galaxies appear to differ as a function of increasing optical brightness of galaxies. According to cross-and mark-correlation analyses, the former result is largely driven by the increased dust content in optically bright star-forming galaxies. The latter could be interpreted as evidence of a correlation between interaction-scale and optical brightness of galaxies, where physical evidence of interactions between optically bright star formers, likely hosted within relatively massive haloes, persists over larger separations than those between optically faint star formers.
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