| Autor: |
Fumiya Maeda, Fumi Egusa, Akiyoshi Tsujita, Shuhei Inoue, Kotaro Kohno, Shinya Komugi, Kouji Ohta, Yoshihisa Asada, Yusuke Fujimoto, Asao Habe, Bunyo Hatsukade, Shin Inoue, Hiroyuki Kaneko, Masato I. N. Kobayashi, Tomoka Tosaki |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
The Astrophysical Journal, Vol 962, Iss 1, p 4 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1538-4357 |
| DOI: |
10.3847/1538-4357/ad1932 |
| Popis: |
The tip of the tidal tail, resulting from an encounter between galaxies, features gas concentrations and some star-forming regions, such as tidal dwarf galaxies (TDGs). This region provides a unique laboratory for examining the star formation process in a dynamical environment distinct from that of disk galaxies. Using the Nobeyama 45 m telescope, we conducted ^12 CO(1−0) position-switching observations at the tips of the southern tidal tail in the Antennae galaxies. We detected CO emission not only from the two star-forming TDG candidates but also in regions with no significant star formation. Adopting a Galactic CO-to-H _2 conversion factor without helium correction, the H _2 gas surface density is ∼5–12 M _⊙ pc ^−2 . In most regions, the molecular-to-atomic gas ratio is around unity (0.6–1.9), but we find a region with a high ratio with a 3 σ lower limit of >7.2. The star formation efficiency (SFE) of molecular gas is notably low ( |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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