Galactic Worm 123.4-1.5 (GW 123.4-1.5) is an H I region with a mass of approximately 105 MSun.[3] It has an unusual mushroom-shaped structure that may be the result of having been formed by an infalling cloud slamming through the disc of the Milky Way from the other side. The high-velocity cloud in question is theorized as having hit at around 100 km/s, 5×107 years ago.[2]
| Interstellar cloud | |
|---|---|
| H I region | |
| Observation data: J2000 epoch | |
| Right ascension | 00h 55m [1] |
| Declination | +61° 24′[1] |
| Distance | 12,400 ± 3,900 ly (3800±1200[2] pc) |
| Constellation | Cassiopeia |
References
edit- ^ a b "GW 123.4-1.5". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-19.
- ^ a b Baek, Chang Hyun; Kudoh, Takahiro; Tomisaka, Kohji (2008). "How was the Mushroom-shaped GW 123.4–1.5 Formed in the Galactic Disk?". The Astrophysical Journal. 692 (1): 434–444. arXiv:0801.3186. Bibcode:2008ApJ...682..434B. doi:10.1086/589556. S2CID 17971014.
- ^ English, Jayanne; Taylor, A. R.; Mashchenko, S. Y.; Irwin, Judith A.; Basu, Shantanu; Johnstone, Doug; Basu, Shantanu; Johnstone, Doug (2000). "The Galactic Worm GW 123.4−1.5: A Mushroom-shaped H I Cloud". The Astrophysical Journal. 533 (1): L25–L28. arXiv:astro-ph/0003081. Bibcode:2000ApJ...533L..25E. doi:10.1086/312592. PMID 10727383. S2CID 5878889.
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