2025-04-23 東京大学
黒で示された小さな銀河J1044+0353が巨大バブルを吹き出す様子 (クレジット: E. C. Herenz)
＜関連情報＞
- https://www.c.u-tokyo.ac.jp/info/news/topics/20250723180000.html
- https://academic.oup.com/pasj/advance-article-abstract/doi/10.1093/pasj/psaf073/8209789
極端な星形成領域J1044+0353がキロパーセク規模の泡を吹き出す The extreme starburst J1044+0353 blows kiloparsec-scale bubbles
Edmund Christian Herenz , Haruka Kusakabe , Soumil Maulick
Publications of the Astronomical Society of Japan Published:23 July 2025
DOI:https://doi.org/10.1093/pasj/psaf073
Abstract
We report the discovery of a kiloparsec-scale lacy filamentary structure in low-surface-brightness Hα and [O iii] λ5077emission around the low-redshift, extremely metal-poor and compact reionization-era analogue SDSS J1044+0353. We identify seven elliptical arcs in Hα emission at SBHα ～1–2×10-18 ergs-1 cm-2 arcsec-2. We interpret these features as limb-brightened giant shells that bound egg-shaped super-bubbles with 3–3.5 kpc radii. These shells are significantly larger than the known giant shells around nearby star-forming dwarfs. Kinematic maps reveal a gradient perpendicular to the major axis and line broadening in the outskirts. The latter, when interpreted due to line splitting of the expanding shells, suggests expansion velocities of～40 km s-1. Notably, the properties of the giant shells evade description by simple analytic prescriptions for energy- and momentum-driven super-bubbles.
