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- W4387635873 abstract "We explore the growth of the stellar disks in 14 nearby spiral galaxies as part of the Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium (DIISC) survey. We study the radial distribution of specific star formation rates (sSFR) and investigate the ratio of the difference in the outer and inner sSFR ($Delta_{sSFR}~={rm sSFR}_{out}-{rm sSFR}_{in}$) of the disk and the total sSFR, $Delta_{sSFR}$/sSFR to quantify disk growth. We find $Delta_{sSFR}$/sSFR and the HI gas fraction to show a mild correlation of Spearman's $rho=0.30$, indicating that star formation and disk growth are likely to proceed outward in galactic disks with high HI gas fractions. The HI gas fractions and $Delta_{sSFR}$/sSFR of the galaxies also increase with the distance to the nearest L$_star$ neighbor, suggesting that galaxies are likely to sustain their ISM cold gas and exhibit inside-out growth in isolated environments. However, the HI content in their circumgalactic medium, probed by the Ly$alpha$ equivalent width (W$_{Lyalpha}$) excess, is observed to be suppressed in isolated environments, apparent from the strong anti-correlation between the W$_{Lyalpha}$ excess and the distance to the 5$^{rm th}$ nearest L$_star$ neighbor (Spearman's $rho=-0.62$). As expected, W$_{Lyalpha}$ is also found to be suppressed in cluster galaxies. We find no relation between the W$_{Lyalpha}$ excess of the detected CGM absorber and $Delta_{sSFR}$/sSFR implying that the enhancement and suppression of the circumgalactic HI gas does not affect the direction in which star formation proceeds in a galactic disk or vice-versa." @default.
- W4387635873 created "2023-10-14" @default.
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- W4387635873 date "2023-10-12" @default.
- W4387635873 modified "2023-10-15" @default.
- W4387635873 title "DIISC-III: Signatures of Stellar Disk Growth in Nearby Galaxies" @default.
- W4387635873 doi "https://doi.org/10.48550/arxiv.2310.08482" @default.
- W4387635873 hasPublicationYear "2023" @default.
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