Elevation or Suppression? The Resolved Star Formation Main Sequence of Galaxies with Two Different Assembly Modes. Liu, Q., Wang, E., Lin, Z., Gao, Y., Liu, H., Berhane Teklu, B., & Kong, X. ArXiv e-prints, 1803:arXiv:1803.00319, March, 2018.
Elevation or Suppression? The Resolved Star Formation Main Sequence of Galaxies with Two Different Assembly Modes [link]Paper  abstract   bibtex   
We investigate the spatially-resolved star formation main sequence in star-forming galaxies (SFGs) using Integral Field Spectroscopic (IFS) observations from the Mapping Nearby Galaxies at the Apache Point Observatory (MaNGA) survey. We demonstrate that the correlation between the stellar mass surface density (\${\textbackslash}Sigma_*\$) and star formation rate surface density (\${\textbackslash}Sigma_\{{\textbackslash}mathrm\{SFR\}\}\$) holds down to sub-galactic scale, leading to the Sub-Galactic Main Sequence (SGMS). By dividing galaxies into two populations based on their recent mass assembly modes, we find the resolved main sequence in galaxies with 'outside-in' mode is steeper than that in galaxies with 'inside-out' mode. This is also confirmed on a galaxy-by-galaxy level, where we find the distributions of SGMS slopes for individual galaxies are clearly separated for the two populations. When normalizing and stacking the SGMS of individual galaxies on one panel for the two populations, we find the inner regions of galaxies with 'inside-out' mode statistically exhibit a suppression in star formation, with a less significant trend in the outer regions of galaxies with 'outside-in' mode. In contrast, the inner regions of galaxies with 'outside-in' mode and the outer regions of galaxies with 'inside-out' mode follow a slightly sub-linear scaling relation with a slope \${\textbackslash}sim\$0.9, which is in good agreement with previous findings, suggesting that they are experiencing a universal regulation without influences of additional physical processes.
@article{liu_elevation_2018,
	title = {Elevation or {Suppression}? {The} {Resolved} {Star} {Formation} {Main} {Sequence} of {Galaxies} with {Two} {Different} {Assembly} {Modes}},
	volume = {1803},
	shorttitle = {Elevation or {Suppression}?},
	url = {http://adsabs.harvard.edu/abs/2018arXiv180300319L},
	abstract = {We investigate the spatially-resolved star formation main sequence in 
star-forming galaxies (SFGs) using Integral Field Spectroscopic (IFS)
observations from the Mapping Nearby Galaxies at the Apache Point
Observatory (MaNGA) survey. We demonstrate that the correlation between
the stellar mass surface density (\${\textbackslash}Sigma\_*\$) and star formation rate
surface density (\${\textbackslash}Sigma\_\{{\textbackslash}mathrm\{SFR\}\}\$) holds down to sub-galactic
scale, leading to the Sub-Galactic Main Sequence (SGMS). By dividing
galaxies into two populations based on their recent mass assembly modes,
we find the resolved main sequence in galaxies with 'outside-in' mode is
steeper than that in galaxies with 'inside-out' mode. This is also
confirmed on a galaxy-by-galaxy level, where we find the distributions
of SGMS slopes for individual galaxies are clearly separated for the two
populations. When normalizing and stacking the SGMS of individual
galaxies on one panel for the two populations, we find the inner regions
of galaxies with 'inside-out' mode statistically exhibit a suppression
in star formation, with a less significant trend in the outer regions of
galaxies with 'outside-in' mode. In contrast, the inner regions of
galaxies with 'outside-in' mode and the outer regions of galaxies with
'inside-out' mode follow a slightly sub-linear scaling relation with a
slope \${\textbackslash}sim\$0.9, which is in good agreement with previous findings,
suggesting that they are experiencing a universal regulation without
influences of additional physical processes.},
	urldate = {2018-04-16},
	journal = {ArXiv e-prints},
	author = {Liu, Qing and Wang, Enci and Lin, Zesen and Gao, Yulong and Liu, Haiyang and Berhane Teklu, Berzaf and Kong, Xu},
	month = mar,
	year = {2018},
	keywords = {Astrophysics - Astrophysics of Galaxies},
	pages = {arXiv:1803.00319},
}

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