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Messier 77 or M77, also known as NGC 1068 and the Squid Galaxy, is a barred spiral galaxy about 47 million light-years away in the constellation Cetus. 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.[8] Both Messier and William Herschel described this galaxy as a star cluster.[8] Today, however, the object is known to be a galaxy.

Messier 77
Hubble Space Telescope image of M77 core
Observation data (J2000 epoch)
ConstellationCetus
Right ascension02h 42m 40.771s[1]
Declination−00° 00′ 47.84″[1]
Redshift1,137±3 km/s[2]
Distance47 Mly (14.4 Mpc)[3]
Apparent magnitude (V)8.9[4]
Characteristics
Type(R)SA(rs)b[5]
Mass~1×109[6] M☉
Apparent size (V)7′.1 × 6′.0[2]
Notable featuresOne of the biggest galaxies
of Messier's catalog.
Inclination estimated to be 40°.[3]
Other designations
Cetus A, Arp 37, M77, NGC 1068, PGC 10266, UGC 2188[7]

The morphological classification of NGC 1068 in the De Vaucouleurs system is (R)SA(rs)b,[5] where the '(R)' indicates an outer ring-like structure, 'SA' denotes a non-barred spiral, '(rs)' means a transitional inner ring/spiral structure, and 'b' says the spiral arms are moderately wound.[9] Ann et al. (2015) gave it a class of SAa,[10] suggesting tightly wound arms. However, infrared images of the inner part of the galaxy reveal a prominent bar not seen in visual light,[11] and for this reason it is now considered a barred spiral.[12]

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[13] and one of the closest and best-studied[12] type 2 Seyfert galaxies,[3] forming a prototype of this class.[12]

M77 Type II Supernova, Nov. 2018
M77 Type II Supernova, Nov. 2018

X-ray source 1H 0244+001 in Cetus has been identified as Messier 77.[14] Only one supernova has been detected in Messier 77. The supernova, named SN 2018ivc, was discovered on 24 November 2018 by the DLT40 Survey. It is a type II supernova, and at discovery it was 15th magnitude and brightening.[15]

In February 2022 The European Southern Observatory found a cloud of cosmic dust at the centre of Messier 77 hiding a supermassive black hole.[16]

In November 2022, the IceCube collaboration announced detection of neutrinos emitted by the active region, only the second astrophysical source of neutrinos so far detected, after the supernova SN1987A.[17]


See also



References


  1. Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131: 1163–1183. doi:10.1086/498708. ISSN 0004-6256.
  2. "NASA/IPAC Extragalactic Database". Results for NGC 1068. Retrieved 18 November 2006.
  3. 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 (1): 142–157. arXiv:astro-ph/0406426. Bibcode:2004ApJ...614..142R. doi:10.1086/423423. S2CID 17095983.
  4. "Messier 77". SEDS Messier Catalog. Retrieved 30 April 2022.
  5. de Vaucouleurs, G.; et al. (1991), Third reference catalogue of bright galaxies, 9, New York: Springer-Verlag.
  6. "Messier 77: Cetus A - Messier Objects". www.messier-objects.com. Retrieved 18 April 2018.
  7. "M 77". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 14 December 2018.
  8. K. G. Jones (1991). Messier's Nebulae and Star Clusters (2nd ed.). Cambridge University Press. ISBN 978-0-521-37079-0.
  9. de Vaucouleurs, Gérard (April 1963), "Revised Classification of 1500 Bright Galaxies", Astrophysical Journal Supplement, 8: 31, Bibcode:1963ApJS....8...31D, doi:10.1086/190084.
  10. Ann, H. B.; et al. (2015), "A Catalog of Visually Classified Galaxies in the Local (z ∼ 0.01) Universe", The Astrophysical Journal Supplement Series, 217 (2): 27–49, arXiv:1502.03545, Bibcode:2015ApJS..217...27A, doi:10.1088/0067-0049/217/2/27, S2CID 119253507.
  11. Thronson, Harley A. Jr.; et al. (1 August 1989), "Near-infrared image of NGC 1068 - Bar-driven star formation and the circumnuclear composition", Astrophysical Journal, Part 1, 343: 158–168, Bibcode:1989ApJ...343..158T, doi:10.1086/167693.
  12. Alexander, Tal; Lutz, Dieter; Sturm, Eckhard; Genzel, Reinhard; Sternberg, Amiel; Netzer, Hagai (June 2000), "Infrared Spectroscopy of NGC 1068: Probing the Obscured Ionizing AGN Continuum", The Astrophysical Journal, 536 (2): 710–717, arXiv:astro-ph/0002107, Bibcode:2000ApJ...536..710A, doi:10.1086/308973, S2CID 15617708.
  13. de Vaucouleurs, Gérard (1973). "Southern Galaxies.VI. Luminosity Distribution in the Seyfert Galaxy NGC 1566". Astrophysical Journal. 181: 31–50. Bibcode:1973ApJ...181...31D. doi:10.1086/152028.
  14. Wood KS; Meekins JF; Yentis DJ; Smathers HW; McNutt DP; Bleach RD (1984). "The HEAO A-1 X-ray source catalog". Astrophysical Journal Supplement Series. 56 (12): 507–649. Bibcode:1984ApJS...56..507W. doi:10.1086/190992.
  15. King, Bob (29 November 2018). "Supernova Discovered in the Bright Galaxy M77". Sky & Telescope. Retrieved 30 November 2018.
  16. Observatory, European Southern (16 February 2022). "Supermassive Black Hole Caught Hiding in an Immense Ring of Cosmic Dust". SciTechDaily. Retrieved 21 February 2022.
  17. "IceCube neutrinos provide new view of active galaxy". Retrieved 3 November 2022.


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На других языках

[de] Messier 77

Messier 77 (auch als NGC 1068 bezeichnet) ist eine 8,9 mag helle Spiralgalaxie mit einer Flächenausdehnung von 7,1' × 6,0' im Sternbild Walfisch. Diese Galaxie vom Hubble-Typ Sb ist als Radiogalaxie auch unter dem Namen Cetus A bekannt und beherbergt einen aktiven Galaxienkern in ihrem Zentrum. Ihr Abstand beträgt etwa 60 Millionen Lichtjahre, so dass M77 tatsächlich eine der größten Spiralgalaxien im Messier-Katalog ist. Das Objekt ist ein enger Nachbar von NGC 1087.[4]Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Diese Galaxie gehört zu der Klasse Spiralgalaxien mit einem Begleiter niedriger Flächenhelligkeit auf einem Arm (Arp-Katalog).
- [en] Messier 77

[es] Galaxia espiral M77

Messier 77 (también conocido como NGC 1068) es una galaxia espiral barrada a unos 47 millones de años luz en la constelación Cetus. Fue descubierta por Pierre Méchain en 1780.

[ru] M 77 (галактика)

Messier 77 (англ. M 77, NGC 1068, рус. Мессье 77, другие обозначения — IRAS02401-0013, UGC 2188, KUG 0240-002, MCG 0-7-83, Arp 37, ZWG 388.98, 3C 71, PGC 10266) — пекулярная спиральная галактика в созвездии Кит.


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