Shirt a Phobia

Sample Page

This article is about the void galaxy. For the Milky Way satellite galaxy, see Pisces II.
Not to be confused with Beta Piscium.

Pisces B (Psc B) is an irregular void dwarf galaxy within the Local Void in the constellation Pisces, near Pisces A, and lies 9.2 megaparsecs (30 million light-years) away from the Earth.[3] It was discovered by Yale, Columbia, and CalTech astronomers using the WIYN Observatory in November 2014, along with its neighbor Pisces A, as a result of a blind HI region survey.[4][5][6]

Structure

Pisces B consists of an irregular-galaxy structure, with a much less complex composition consisting of cooler gas in comparison to other galaxies;[3][7] this is most likely a result of lower rates of star formation throughout the galaxy’s past.[4][8] However, Pisces B is currently traveling towards a larger region of gas and other interstellar mediums;[3][9] as a result, both Pisces A and B are expected to undergo starburts periods sometime in the next few billion years.[9][7]

Discovery

Astronomers Erik Tollerud and Marla Geha of Yale University, Jana Grcevich and Mary Putman of Columbia University, and Daniel Stern of CalTech first reported the two galaxies in November 2014 as a result of GALFA-H I,[8] an optical imaging and spectroscopy survey of 21-centimeter emission HI clouds,[6] and remain the only two galaxies to have been discovered by an HI survey.[6][8] Their existences were later confirmed by a series of observation by Hubble.[9]

Pisces A and B were also found to be beyond the range of any significant dark-matter halos;[4] this has made them points of intense study, as they provide crucial information to galaxy formation and existing dwarf galaxy models.[3][8]

See Also

  • Pisces A, another void dwarf galaxy in the Local Void

References

  1. ^ a b c d e f “[TGG2015] Pisces B”. SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-10-28.
  2. ^ “Hubble Sees Two Dwarf Galaxies in Pisces”. Sci-News. 15 August 2016.
  3. ^ a b c d Staff, News (2016-08-15). “Hubble Sees Two Dwarf Galaxies in Pisces | Sci.News”. Sci.News: Breaking Science News. Retrieved 2026-04-22. {{cite web}}: |first= has generic name (help)
  4. ^ a b c Tollerud, Erik J.; Geha, Marla C.; Grcevich, Jana; Putman, Mary E.; Weisz, Daniel R.; Dolphin, Andrew E. (2016-08-20). “HST Imaging of the Local Volume Dwarf Galaxies Pisces a and B: Prototypes for Local Group Dwarfs”. The Astrophysical Journal. 827 (2): 89. arXiv:1607.03487. Bibcode:2016ApJ…827…89T. doi:10.3847/0004-637X/827/2/89. ISSN 0004-637X.
  5. ^ Tollerud, Erik J.; Geha, Marla C.; Grcevich, Jana; Putman, Mary E.; Weisz, Daniel R.; Dolphin, Andrew E. (2016-08-20). “HST Imaging of the Local Volume Dwarf Galaxies Pisces a and B: Prototypes for Local Group Dwarfs”. The Astrophysical Journal. 827 (2): 89. arXiv:1607.03487. Bibcode:2016ApJ…827…89T. doi:10.3847/0004-637X/827/2/89. ISSN 0004-637X.
  6. ^ a b c Tollerud, Erik J.; Geha, Marla C.; Grcevich, Jana; Putman, Mary E.; Stern, Daniel (January 2015). “Two Local Volume Dwarf Galaxies Discovered in 21 cm Emission: Pisces A and B”. The Astrophysical Journal. 798 (1): L21. arXiv:1411.5019. Bibcode:2015ApJ…798L..21T. doi:10.1088/2041-8205/798/1/L21. ISSN 0004-637X.
  7. ^ a b Carignan, C.; Libert, Y.; Lucero, D. M.; Randriamampandry, T. H.; Jarrett, T. H.; Oosterloo, T. A.; Tollerud, E. J. (2016-03-01). “H I observations of two new dwarf galaxies: Pisces A and B with the SKA Pathfinder KAT-7”. Astronomy & Astrophysics. 587: L3. arXiv:1601.00494. Bibcode:2016A&A…587L…3C. doi:10.1051/0004-6361/201527910. ISSN 0004-6361.
  8. ^ a b c d Merritt, Allison; van Dokkum, Pieter; Abraham, Roberto (June 2014). “The Discovery of Seven Extremely Low Surface Brightness Galaxies in the Field of the Nearby Spiral Galaxy M101”. The Astrophysical Journal. 787 (2): L37. arXiv:1406.2315. Bibcode:2014ApJ…787L..37M. doi:10.1088/2041-8205/787/2/L37. ISSN 0004-637X.
  9. ^ a b c “Hubble uncovers a galaxy pair coming in from the wilderness”. ScienceDaily. Retrieved 2026-04-22.

Further reading