室女座星系团中一个近暗弱星系的偶然发现
Serendipitous discovery of an almost-dark galaxy in the Virgo Cluster
- Instituto de Astrofísica de Canarias(加那利天体物理学研究所)
- Universidad de La Laguna(拉帕尔马大学)
- Kapteyn Astronomical Institute, University of Groningen(格罗宁根大学卡普坦天文研究所)
- Leibniz-Institut für Astrophysik Potsdam (AIP)(波茨坦莱布尼茨天体物理研究所)
- Institute of Space Sciences (ICE, CSIC)(空间科学研究所)
- University of Washington(华盛顿大学)
机构由 AI 辅助整理,请以论文原文为准。
AI总结:
研究人员通过两台两米望远镜偶然发现室女座星系团中的低质量近暗弱星系TTT J1237327+143535,其特性与已知矮星系相似,该发现暗示室女座星系团存在大量此类星系,相关巡天将助力极端条件下星系形成研究。
AI中文摘要:
具有极低表面亮度和大有效半径的极端本星系群星系的类似天体必定存在于其他区域,但受限于当前探测极限仍未被发现。我们报告在室女座星系团中偶然发现了一个低质量近暗弱星系TTT J1237327+143535,该星系由泰德天文台的两台两米望远镜观测得到。TTT J1237327+143535在g'波段的中心表面亮度为27.9±0.2 mag arcsec⁻²,有效半径为0.9±0.1 kpc,总恒星质量为(2.2±0.4)×10⁶ M☉。其有效半径和绝对星等与星系And XXI、And XXIII相似。这个极端低表面亮度、延展型低质量星系的发现表明室女座星系团中存在大量近暗弱星系。对下一代室女座星系团巡天的深入分析,以及即将到来的Rubin数据发布和10年Rubin时空遗产巡天,有望揭示这类极端星系的大样本,为极端条件下的星系形成研究提供见解。
英文摘要:
Analogues of extreme Local Group galaxies with very low surface brightnesses and large effective radii must exist elsewhere, still hidden due to current detection limits. We report the serendipitous discovery of the low-mass almost-dark galaxy TTT J1237327+143535 in the Virgo Cluster, observed using the Two-meter Twin Telescope at the Teide Observatory. TTT J1237327+143535 has a central surface brightness of $27.9 \pm 0.2 \, \mathrm{mag\, arcsec}^{-2}$ in the $g'$ band, an effective radius of $0.9 \pm 0.1 \mathrm{kpc}$, and a total stellar mass of $(2.2 \pm 0.4) \times 10^6 \mathrm{M_\odot}$. Its effective radius and absolute magnitude are similar to those of galaxies And XXI and And XXIII. The discovery of this extremely low-surface-brightness, extended, low-mass galaxy suggests the existence of a significant population of almost-dark galaxies in the Virgo Cluster. An in-depth analysis of the Next Generation Virgo Cluster Survey, as well as upcoming Rubin data releases and the 10-year Rubin Legacy Survey of Space and Time, is expected to reveal large samples of this extreme galaxy population, which will offer insights into galaxy formation in extreme conditions.