World Library  
Flag as Inappropriate
Email this Article

Messier 77

Article Id: WHEBN0000967488
Reproduction Date:

Title: Messier 77  
Author: World Heritage Encyclopedia
Language: English
Subject: Atlas of Peculiar Galaxies, NGC 1055, Seyfert galaxy, Messier 81, List of Messier objects
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Messier 77

Messier 77
Hubble Space Telescope image of M77 core
Observation data (J2000 epoch)
Constellation Cetus
Right ascension 2h 42m 40.7s[1]
Declination −00° 00′ 48″[1]
Redshift 1137 ± 3 km/s[1]
Distance 47.0 Mly (14.4 Mpc)[2]
Type (R)SA(rs)b[1]
Apparent dimensions (V) 7′.1 × 6′.0[1]
Apparent magnitude (V) 9.6[1]
Notable features One of the biggest galaxies
of Messier's catalog.
Inclination estimated to be 40°.[2]
Other designations
Cetus A, M77, NGC 1068, UGC 2188, PGC 10266, Arp 37[1]

Messier 77 (also known as NGC 1068) is a barred spiral galaxy about 47 million light-years away in the constellation Cetus. Messier 77 is an active galaxy with an Active Galactic Nucleus (AGN), which is obscured from view by astronomical dust at visible wavelengths. The diameter of the molecular disk and hot plasma associated with the obscuring material was first measured at radio wavelengths by the VLBA and VLA. The hot dust around the nucleus was subsequently measured in the mid-infrared by the MIDI instrument at the VLTI. It is the brightest[3] Seyfert galaxy and is of type 2.[2]

Messier 77's diameter is 170,000 light-years.

M77 with amateur telescope.
Messier 77 (M77) barred spiral galaxy

Contents

  • History 1
  • X-ray source 2
  • References 3
  • External links 4

History

Messier 77 was discovered by Pierre Méchain in 1780, who originally described it as a nebula. Méchain then communicated his discovery to Charles Messier, who subsequently listed the object in his catalog.[4] Both Messier and William Herschel described this galaxy as a star cluster.[4] Today, however, the object is known to be a galaxy.

X-ray source

X-ray source 1H 0244+001 in Cetus has been identified as Messier 77 (NGC 1068, M77).[5]

References

  1. ^ a b c d e f g "NASA/IPAC Extragalactic Database". Results for NGC 1068. Retrieved 2006-11-18. 
  2. ^ a b c R. J. Rand; J. F. Wallin (2004). "Pattern Speeds BIMA-SONG Galaxies with Molecule-Dominated ISMs Using the Tremaine-Weinberg Method". The Astrophysical Journal 614: 142–157.  
  3. ^ de Vaucouleurs, Gérard (1973). "Southern Galaxies.VI. Luminosity Distribution in the Seyfert Galaxy NGC 1566".  
  4. ^ a b K. G. Jones (1991). Messier's Nebulae and Star Clusters (2nd ed.).  
  5. ^ Wood KS; Meekins JF; Yentis DJ; Smathers HW; McNutt DP; Bleach RD (1984). "The HEAO A-1 X-ray source catalog".  

External links

  • Messier 77 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
  • "StarDate: M77 Fact Sheet"
  • Spiral Galaxy M77 @ SEDS Messier pages
  • VLBA image of the month: radio continuum and water masers of NGC 1068
  • Press release about VLTI observations of NGC 1068
  • Gray, Meghan; Hardy, Liam. "M77 – Globular Cluster". Deep Space Videos.  
  • APOD image of Messier 77 - May 10, 2013

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.