Godzilla (star)

Godzilla is a variable star in the Sunburst galaxy at redshift z = 2.38 (or 10.9 billion light years from Earth), observed through the gravitational lens PSZ1 G311.65-18.48.[1] It was originally identified as a possible transient event in images taken with the Hubble Space Telescope (HST).[2]

For other uses, see Godzilla (disambiguation).
Godzilla (star)
[[File:|3000px|alt=]]
The transient candidate dubbed Godzilla is the bright spot at the very center, at the left edge of the arc and immediately above the orange, foreground star. Cropped from original image.[1]
Credit: ESA/Hubble, NASA, Rivera-Thorsen et al.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Apus
Right ascension 15h 50m 00.66s[1]
Declination −78° 11′ 09.96″[1]
Characteristics
Evolutionary stage LBV?[1]
Astrometry
Absolute magnitude (MV)-17.3 – -14.8,[lower-alpha 1] <-14.7[lower-alpha 2][1]
Details
Radius430 – 2,365[1] R☉
Luminosity134,000,000 – 255,000,000[1][lower-alpha 3] L☉
Temperature15,000 – 30,000[1] K
Other designations
Godzilla star

As of October 2022, it is the most luminous star that can be currently observed.[1][3] This is possible thanks to the fact that the star is believed to be undergoing an episode of temporary increased luminosity that has lasted at least seven years, combined with an estimated magnification of at least a factor of 2000.

Some spectral features in Godzilla resemble those of other variable stars in the Milky Way Galaxy such as Eta Carinae suggesting that Godzilla could be close to the end of its life. Godzilla is believed to be going through an episode similar to the Great Eruption of Eta Carinae in the 19th century, during which the star was likely among the brightest in the universe at about 50 million L☉.

The extreme magnification of Godzilla is partially due to a nearby substructure, probably a dwarf galaxy, not seen in the HST images, that is also close to the critical curve of the cluster. This unobserved substructure is believed to be dominated by dark matter.[1]

See also

Notes
  1. Assuming t1-t5 are counterimages.
  2. Assuming t1-t5 are not counterimages.
  3. Derived from model temperatures and radii (30,000 K, 2 AU, 15,000 K, 11 AU)

References
  1. Diego, J. M.; Pascale, M.; Kavanagh, B. J.; Kelly, P.; Dai, L.; Frye, B.; Broadhurst, T. (2022). "Godzilla, a monster lurks in the Sunburst galaxy". Astronomy and Astrophysics. 665: A134. arXiv:2203.08158. Bibcode:2022A&A...665A.134D. doi:10.1051/0004-6361/202243605. S2CID 247476158.
  2. Vanzella, E.; Meneghetti, M.; Pastorello, A.; Carulla, F. (2020). "Probing the circumstellar medium 2.8 Gyr after the big bang: detection of Bowen fluorescence in the Sunburst arc". Monthly Notices of the Royal Astronomical Society. 499 (1): L67–L71. arXiv:2004.08400. Bibcode:2020MNRAS.499L..67V. doi:10.1093/mnrasl/slaa163.
  3. "Scientists face down 'Godzilla', the most luminous star known". Nature. 610 (7930): 10. 6 October 2022. Bibcode:2022Natur.610T..10.. doi:10.1038/d41586-022-03054-3. PMID 36171306. S2CID 252598653.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.