Discovery of compact disc galaxies with high-surface brightness in the Sloan Digital Sky Survey

Cheng Yu Chen, Chorng Yuan Hwang

Research output: Contribution to journalArticlepeer-review

Abstract

Compact disc galaxies (CDGs) with high-surface brightness were identified in the Sloan Digital Sky Survey data. We determined the surface profiles of the CDGs and compared them to those of normal-sized disc galaxies (NDGs). The CDGs have higher central brightness and older stellar age than the NDGs. Furthermore, the brightness profiles of the CDGs fit a Sérsic model with n ≈ 2.11 and have a zero g′ - r′ colour gradient on average. By contrast, the NDGs fit an exponential profile and have a negative colour gradient on average. These results indicate that the structure and stellar population of the CDGs and NDGs differ. We suggest that the CDGs are ancient galaxies in the quenching phase following the initial central starburst.

Original languageEnglish
Pages (from-to)5025-5032
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume525
Issue number4
DOIs
StatePublished - 1 Nov 2023

Keywords

  • galaxies: fundamental parameters
  • galaxies: photometry
  • galaxies: spiral

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