천문학회보 (The Bulletin of The Korean Astronomical Society)

한국천문학회 (The Korean Astronomical Society)
권호 표지

Stellar photometric Properties in the outskirt of NGC 5236

  • Kim, Sanghyun (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Kim, Minjin (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Byun, Woowon (Korea Astronomy and Space Science Institute) ;
  • Sheen, Yun-Kyeong (Korea Astronomy and Space Science Institute) ;
  • Ho, Luis C (Kavli Institute for Astronomy and Astrophysics, Peking University) ;
  • Lee, Joon Hyeop (Korea Astronomy and Space Science Institute) ;
  • Kim, Sang Chul (Korea Astronomy and Space Science Institute) ;
  • Jeong, Hyunjin (Korea Astronomy and Space Science Institute) ;
  • Park, Byeong-Gon (Korea Astronomy and Space Science Institute) ;
  • Seon, Kwang-Il (Korea Astronomy and Space Science Institute)
  • 발행 : 2020.10.13
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

In the hierarchical framework, galaxies grow through mergers and accretion. Those mechanisms leave faint features, such as stellar streams, shells and smooth stellar halos in the outskirts of galaxies. In order to search for those features in the nearby galaxies, we are conducting a KMTNet Nearby Galaxy Survey using the Korea Microlensing Telescope Network. We present a deep and wide-field imaging of NGC 5236, a barred spiral galaxy. In one-dimensional surface brightness profiles, we reach 28, 29 mag/arcsec2 in the R- and B-band, respectively. We find that the outer disk of NGC 5236 can be well described with a single exponential profile up to 17 kpc (~3.8 Reff) indicating that the excess light due to the stellar halo is not clearly detected. B-R color gradually increases towards the outskirts of the galaxy. It may reveal that stellar properties in the outskirts are marginally distinctive from those in the central part.

키워드