Physical properties variation across the green valley for local galaxies
  We have selected a sample of nearby galaxies from Sloan Digital Sky Survey
Data Release 7 (SDSS DR7) to investigate the physical properties variation from
blue cloud to green valley to red sequence. The sample is limited in a narrow
range in color-stellar mass diagram. After splitting green valley galaxies into
two parts---a bluer green valley (green 1) and a redder one (green 2) and three
stellar mass bins, we investigate the physical properties variation across the
green valley region. Our main results are as following: (i) The percentages of
pure bulge and bulge-dominated/elliptical galaxies increase gradually from blue
cloud to red sequence while the percentages of pure disk and
disk-dominated/spiral galaxies decrease gradually in all stellar mass bins and
different environments; (ii) With the analysis of morphological and structural
parameters (e.g., concentration (C) and the stellar mass surface density within
the central 1Kpc ($\Sigma_{1}$)), red galaxies show the most luminous and
compact cores than both green valley and blue galaxies while blue galaxies show
the opposite behavior in all stellar mass bins. (iii) A strong negative
(positive) relationship between bulge-to-total light ratio (B/T) and specific
star formation rate (sSFR) ($D_{4000}$) is found from blue to red galaxies. Our
results indicate that the growth of bulge plays an important role when the
galaxies change from the blue cloud, to green valley, and to the red sequence.
