NGC 1566

NGC 1566, sometimes known as the Spanish Dancer,[3][4] is an intermediate spiral galaxy in the constellation Dorado. It is the dominant and brightest member[5] of the Dorado Group,[6][7] being among the brightest Seyfert galaxies in the sky.[5] Absolute luminosity is 3.7×1010 L,[8] and is calculated to contain 1.4×1010 M of H I.[8]

NGC 1566
Grand Swirls NGC 1566
A close-up image of NGC 1566 taken by the Hubble’s Wide Field Camera 3.
Observation data (J2000 epoch)
ConstellationDorado
Right ascension4h 20m .4s[1]
Declination−54° 56′ 16″[1]
Redshift0.005017[1]
Helio radial velocity1504 ± 2 km/s[1]
Distance38.4 ± 18.6 Mly
(11.8 ± 5.7 Mpc)[2]
Apparent magnitude (V)10.3[1]
Characteristics
TypeSAB(rs)bc[1]
Apparent size (V)8′.3 × 6′.6[1]
Other designations
PGC 14897[1]

SN 2010el

On June 19, 2010, Berto Monard from South Africa detected a magnitude 16 supernova 13" west and 22" south of the center of NGC 1566 at coordinates 04 19 58.83 -54 56 38.5.[9]

References

  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database", Results for NGC 1566, retrieved 2007-04-01
  2. ^ "Distance Results for NGC 1566". NASA/IPAC Extragalactic Database. Retrieved 2010-06-21.
  3. ^ "Spanish Dancer Galaxy - NGC 1566 - Billions and Billions.com". billionsandbillions.com. Retrieved 2015-10-13.
  4. ^ "NGC 1566 Spanish Dancer Galaxy in Dorado | Amazing Sky Astrophotography by Alan Dyer". amazingsky.photoshelter.com. Retrieved 2015-10-13.
  5. ^ a b de Vaucouleurs, Gérard (April 1, 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
  6. ^ Huchra, John Peter; Geller, Margaret J. (June 15, 1982), "Groups of galaxies. I - Nearby groups", Astrophysical Journal, 257 (Part 1): 423–437, Bibcode:1982ApJ...257..423H, doi:10.1086/160000
  7. ^ Firth, P.; Evstigneeva, E. A.; Jones, J. B.; Drinkwater, M. J.; et al. (November 2006), "Kinematics, substructure and luminosity-weighted dynamics of six nearby galaxy groups", Monthly Notices of the Royal Astronomical Society, 372 (4): 1856–1868, arXiv:astro-ph/0608584, Bibcode:2006MNRAS.372.1856F, doi:10.1111/j.1365-2966.2006.10993.x
  8. ^ a b Virginia A. Kilborn; Bärbel S. Koribalski; Duncan A. Forbes; David G. Barnes; et al. (January 2005), "A Wide-Field Hi Study of the NGC 1566 Group", Monthly Notices of the Royal Astronomical Society, 356 (1): 77–88, arXiv:astro-ph/0409743, Bibcode:2005MNRAS.356...77K, doi:10.1111/j.1365-2966.2004.08450.x
  9. ^ David Bishop. "Latest Supernovae". supernovae.net (International Supernovae Network). Retrieved 2010-06-21.

Coordinates: Sky map 04h 20m 00.4s, −54° 56′ 16″

External links

Dorado

Dorado (English pronunciation: ) is a constellation in the southern sky. It was named in the late 16th century and is now one of the 88 modern constellations. Its name refers to the dolphinfish (Coryphaena hippurus), which is known as dorado in Portuguese, although it has also been depicted as a swordfish. Dorado contains most of the Large Magellanic Cloud, the remainder being in the constellation Mensa. The South Ecliptic pole also lies within this constellation.

Even though the name Dorado is not Latin but Portuguese, astronomers give it the Latin genitive form Doradus when naming its stars; it is treated (like the adjacent asterism Argo Navis) as a feminine proper name of Greek origin ending in -ō (like Io or Callisto or Argo), which have a genitive ending -ūs.

Dorado Group

The Dorado Group is a loose concentration of galaxies containing both spirals and ellipticals. It is generally considered a 'galaxy group' but may approach the size of a 'galaxy cluster'. It lies primarily in the southern constellation Dorado and is one of the richest galaxy groups of the Southern Hemisphere. Gérard de Vaucouleurs was the first to identify it in 1975 as a large complex nebulae II in the Dorado region, designating it as G16.

List of black holes

This is a list of black holes (and stars considered probable candidates) organized by size (including black holes of undetermined mass); some items in this list are galaxies or star clusters that are believed to be organized around a black hole. Messier and New General Catalogue designations are given where possible.

Messier 77

Messier 77 or M77, also known as NGC 1068, 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. Both Messier and William Herschel described this galaxy as a star cluster. Today, however, the object is known to be a galaxy.

The morphological classification of NGC 1068 in the De Vaucouleurs system is (R)SA(rs)b, 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. Ann et al. (2015) gave it a class of SAa, suggesting a non-barred spiral galaxy with tightly wound arms. However, infrared images of the inner part of the galaxy reveal a prominent bar feature not seen in visual light, and for this reason it is now considered a barred spiral.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 and one of the closest and best-studied type 2 Seyfert galaxies, forming a prototype of this class.X-ray source 1H 0244+001 in Cetus has been identified as Messier 77. Only one supernova has been detected in Messier 77. The supernova, named SN 2018 ivc, 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.

NGC 1553

NGC 1553 is a prototypical lenticular galaxy in the constellation Dorado. It is the second brightest member of the Dorado Group of galaxies. British astronomer John Herschel discovered NGC 1553 on December 5, 1834 using an 18.7 inch reflector.

Seyfert galaxy

Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars. They have quasar-like nuclei (very luminous, distant and bright sources of electromagnetic radiation) with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, their host galaxies are clearly detectable.Seyfert galaxies account for about 10% of all galaxies and are some of the most intensely studied objects in astronomy, as they are thought to be powered by the same phenomena that occur in quasars, although they are closer and less luminous than quasars. These galaxies have supermassive black holes at their centers which are surrounded by accretion discs of in-falling material. The accretion discs are believed to be the source of the observed ultraviolet radiation. Ultraviolet emission and absorption lines provide the best diagnostics for the composition of the surrounding material.Seen in visible light, most Seyfert galaxies look like normal spiral galaxies, but when studied under other wavelengths, it becomes clear that the luminosity of their cores is of comparable intensity to the luminosity of whole galaxies the size of the Milky Way.Seyfert galaxies are named after Carl Seyfert, who first described this class in 1943.

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