Astronomy:Pisces B

From HandWiki
Pisces B
Hubble Space Telescope image of Pisces B
Observation data (J2000.0[1] epoch)
ConstellationPisces
Right ascension 01h 19m 11.700s[1]
Declination+11° 07′ 18.22″[1]
Helio radial velocity620.7 ± 0.2[1]
Distance30 Mly (9.2 Mpc)[2]
Other designations
Pisces B,[1] PSC B, GALFA-Dw2[1]

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 trafveling 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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "[TGG2015 Pisces B"]. SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%5BTGG2015%5D+Pisces+B. 
  2. ↑ "Hubble Sees Two Dwarf Galaxies in Pisces". Sci-News. 15 August 2016. http://www.sci-news.com/astronomy/hubble-dwarf-galaxies-pisces-04103.html. 
  3. ↑ 3.0 3.1 3.2 3.3 Staff, News (2016-08-15). "Hubble Sees Two Dwarf Galaxies in Pisces | Sci.News" (in en-US). https://www.sci.news/astronomy/hubble-dwarf-galaxies-pisces-04103.html. 
  4. ↑ 4.0 4.1 4.2 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. doi:10.3847/0004-637X/827/2/89. ISSN 0004-637X. Bibcode: 2016ApJ...827...89T. 
  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. doi:10.3847/0004-637X/827/2/89. ISSN 0004-637X. Bibcode: 2016ApJ...827...89T. 
  6. ↑ 6.0 6.1 6.2 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" (in en). The Astrophysical Journal 798 (1): L21. doi:10.1088/2041-8205/798/1/L21. ISSN 0004-637X. Bibcode: 2015ApJ...798L..21T. https://ui.adsabs.harvard.edu/abs/2015ApJ...798L..21T/abstract. 
  7. ↑ 7.0 7.1 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" (in en). Astronomy & Astrophysics 587: L3. doi:10.1051/0004-6361/201527910. ISSN 0004-6361. Bibcode: 2016A&A...587L...3C. https://www.aanda.org/articles/aa/abs/2016/03/aa27910-15/aa27910-15.html. 
  8. ↑ 8.0 8.1 8.2 8.3 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" (in en). The Astrophysical Journal 787 (2): L37. doi:10.1088/2041-8205/787/2/L37. ISSN 0004-637X. Bibcode: 2014ApJ...787L..37M. https://ui.adsabs.harvard.edu/abs/2014ApJ...787L..37M/abstract. 
  9. ↑ 9.0 9.1 9.2 "Hubble uncovers a galaxy pair coming in from the wilderness" (in en). https://www.sciencedaily.com/releases/2016/08/160811142637.htm. 

Further reading

  • Erik J. Tollerud; Marla C. Geha; Jana Grcevich; Mary E. Putman; Daniel R. Weisz; Andrew E. Dolphin (22 December 2015). "HST Imaging of the Local Volume Dwarf Galaxies Pisces A and B". The Astrophysical Journal 827 (2): 13. 11 August 2016. doi:10.3847/0004-637X/827/2/89. 89. Bibcode: 2016ApJ...827...89T. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Pisces_B&oldid=4387637"