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J/A+A/648/A64 Star formation quenching stages of galaxies (Kalinova+, 2021)
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Beginning of ReadMe :J/A+A/648/A64 Star formation quenching stages of galaxies (Kalinova+, 2021)
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Star formation quenching stages of active and non-active galaxies.
Kalinova V., Colombo D., Sanchez S.F., Kodaira K., Garcia-Benito R.,
Gonzalez Delgado R., Rosolowsky E., Lacerda E.A.D.
<Astron. Astrophys., 648, A64 (2021)>
=2021A&A...648A..64K (SIMBAD/NED BibCode)
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ADC_Keywords: Active gal. nuclei ; Morphology
Keywords: galaxies: evolution - galaxies: structure - galaxies: star formation -
galaxies: active - galaxies: nuclei - galaxies: fundamental parameters
Abstract:
The mechanisms that bring galaxies to strongly reduce their star
formation activity (star-formation quenching) remain poorly
understood. To better study galaxy evolution, we propose a
classification based on maps of ionised hydrogen distribution traced
by the kiloparsec-resolved, equivalent width of Halpha maps, and the
nuclear activity of the galaxies using information from the
Baldwin-Philips-Terlevich diagnostic diagrams. Using these tools, we
group a sample of 238 galaxies from the Calar Alto Legacy Integral
Field spectroscopy Area survey in six quenching stages (QSs): (i)
objects dominated by recent star formation; (ii) systems that present
a quiescent-nuclear-ring structure in their centre; (iii) galaxies
that are centrally quiescent; (iv) galaxies with no clear pattern in
their ionisation gas distribution (mixed); (v) systems that posses
only a few star-forming regions (nearly retired), or (vi) galaxies
that are completely quiescent (fully retired). Regarding their nuclear
activity, we further divide the galaxies into two groups: active
systems that host a weak or strong active galactic nucleus (AGN) at
their centre, and non-active objects. Galaxies grouped into
quenching-stage classes occupy specific locations on the
star-formation-rate versus stellar mass diagram. The 'blue cloud' is
populated by the star-forming and the quiescent-nuclear-ring galaxies,
the 'green valley' is populated by centrally quiescent and mixed
systems, and the 'red sequence' by the nearly- and fully retired
objects. Generally, galaxies that host a weak or strong AGN show
properties comparable to those of their non-active counterparts at the
same QSs, except for the AGN-hosting star-forming systems. The degree
of star-formation quenching increases along the present emission-line
pattern sequence from star-forming to fully retired. The proposed
emission-line classes reinforce the 'inside-out' quenching scenario,
which foresees that the suppression of star formation begins from the
central regions of the galaxies.
Description:
For this work, we adopt the sample of 238 CALIFA galaxies originally
explored in Kalinova et al. (2017, Cat. J/MNRAS/469/2539).