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GW 123.4-1.5

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GW 123.4-1.5
Interstellar cloud
H I region
Observation data: J2000 epoch
Right ascension 00h 55m [1]
Declination +61° 24′ [1]
Distance12,400 ± 3,900  ly    (3800±1200 [2]   pc)
Constellation Cassiopeia
See also: Lists of nebulae

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]

References

  1. 1 2 "GW 123.4-1.5". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-01-19.
  2. 1 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 (1): 434–444. arXiv: 0801.3186 . Bibcode:2008ApJ...682..434B. doi:10.1086/589556. S2CID   17971014.
  3. ↑ 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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