GW 123.4-1.5

GW 123.4-1.5
Interstellar cloud
H I region
Observation data

Galactic Worm 123.4-1.5 (GW 123.4-1.5) is an H I region with a mass of approximately 10⁵ M_Sun.[1] 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]

References

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 [CLC][CSC]i[/CSC][/CLC] Cloud". The Astrophysical Journal. 533: L25–L28. arXiv:astro-ph/0003081. doi:10.1086/312592.
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: 434–444. arXiv:0801.3186. doi:10.1086/589556.

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[1] 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 [CLC][CSC]i[/CSC][/CLC] Cloud". The Astrophysical Journal. 533: L25–L28. arXiv:astro-ph/0003081. doi:10.1086/312592.

[2] 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: 434–444. arXiv:0801.3186. doi:10.1086/589556.