English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the recent star formation history (SFH) in the inner region of57 nearly face-on spiral galaxies selected from the Calar Alto Legacy IntegralField Area (CALIFA) survey. For each galaxy we use the integral fieldspectroscopy from CALIFA to obtain two-dimensional maps and radial profiles ofthree parameters that are sensitive indicators of the recent SFH: the 4000\AA\break (D$_n$(4000)), and the equivalent width of H$\delta$ absorption(EW(H$\delta_A$)) and H$\alpha$ emission (EW(H$\alpha$)). We have alsoperformed photometric decomposition of bulge/bar/disk components based on SDSSoptical image. We identify a class of 17 "turnover" galaxies whose centralregion present significant drop in D$_n$(4000), and most of themcorrespondingly show a central upturn in EW(H$\delta_A$) and EW(H$\alpha$).This indicates that the central region of the turnover galaxies has experiencedstar formation in the past 1-2 Gyr, which makes the bulge younger and morestar-forming than surrounding regions. We find almost all (15/17) the turnovergalaxies are barred, while only half of the barred galaxies in our sample(15/32) are classified as a turnover galaxy. This finding provides strongevidence in support of the theoretical expectation that the bar may drive gasfrom the disc inward to trigger star formation in galaxy center, an importantchannel for the growth/rejuvenation of pseudobulges in disc galaxies.

Bar-induced central star formation as revealed by integral field spectroscopy from CALIFA