NGC 7742

NGC 7742 also known as Fried Egg Galaxy is a face-on unbarred spiral galaxy in the constellation Pegasus.

The galaxy is unusual in that it contains a ring but no bar.[4] Typically, bars are needed to produce a ring structure. The bars' gravitational forces move gas to the ends of the bars, where it forms into the rings seen in many barred spiral galaxies. In this galaxy, however, no bar is present, so this mechanism cannot be used to explain the formation of the ring. O. K. Sil'chenko and A. V. Moiseev proposed that the ring was formed partly as the result of a merger event in which a smaller gas-rich dwarf galaxy collided with NGC 7742. As evidence for this, they point to the unusually bright central region, the presence of highly inclined central gas disk, and the presence of gas that is counterrotating (or rotating in the opposite direction) with respect to the stars.[4]

Two Type II supernovae, SN 1993R and SN 2014cy, have been detected in NGC 7742.[5]

NGC 7742[1]
Seyfert Galaxy NGC 7742
A Hubble Space Telescope (HST) image of NGC 7742.
Credit: NASA/ESA/STScI/AURA.
Observation data
Epoch J2000
Constellation Pegasus
Right ascension  23h 44m 15.7s[2]
Declination +10° 46′ 02″[2]
Apparent dimension (V) 1.778 × 1.698 moa[3]
Apparent magnitude (V)12.35[2]
Characteristics
TypeSA(r)b,[2] LINER/HII[2]
Astrometry
Heliocentric radial velocity 1663 ± 1[2] km/s
Redshift 0.005547 ± 0.000003[2]
Galactocentric velocity 1809 ± 6[2] km/s
Distance 72.4 ± 6.2 Mly (22.20 ± 1.90 Mpc)
Other designations
UGC 12760,[2] MCG +02-60-010,[2] UZC J234415.8+104601,[2] 2MASX J23441571+1046015[2]
Database references
SIMBAD Search NGC 7742 data
See also: Galaxy, List of galaxies

See also

  • NGC 7217 - a face-on spiral galaxy with identical characteristics
  • Sombrero Galaxy - a similar galaxy with a dust ring

References

  1. ^ Filho, M. E.; Barthel, P. D.; Ho, L. C. (October 2002). "The Nature of Composite LINER/HII Galaxies, Part II". The Astrophysical Journal Supplement. 142 (2): 223–238. arXiv:astro-ph/0205196. Bibcode:2002ApJS..142..223F. doi:10.1086/341786. ISSN 0067-0049.
  2. ^ a b c d e f g h i j k l "NASA/IPAC Extragalactic Database". Results for NGC 7742. Retrieved 2006-08-20.
  3. ^ "Centre de Données astronomiques de Strasbourg". Results for NGC 7742. Retrieved 2008-07-09.
  4. ^ a b O. K. Sil'chenko; A. V. Moiseev (2006). "Nature of Nuclear Rings in Unbarred Galaxies: NGC 7742 and NGC 7217". Astronomical Journal. 131 (3): 1336–1346. arXiv:astro-ph/0512431. Bibcode:2006AJ....131.1336S. doi:10.1086/499945.
  5. ^ "List of Supernovae". IAU Central Bureau for Astronomical Telegrams. Retrieved 13 September 2015.

External links

Coordinates: Sky map 23h 44m 15.7s, +10° 46′ 02″

List of spiral galaxies

A spiral galaxy is a type of galaxy characterized by a central bulge of old Population II stars surrounded by a rotating disc of younger Population I stars. A spiral galaxy maintains its spirals arms due to density wave theory.

NGC 7217

NGC 7217 is an unbarred spiral galaxy in the constellation Pegasus.

Pegasus (constellation)

Pegasus is a constellation in the northern sky, named after the winged horse Pegasus in Greek mythology. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and is one of the 88 constellations recognised today.

With an apparent magnitude varying between 2.37 and 2.45, the brightest star in Pegasus is the orange supergiant Epsilon Pegasi, also known as Enif, which marks the horse's muzzle. Alpha (Markab), Beta (Scheat), and Gamma (Algenib), together with Alpha Andromedae (Alpheratz, once also designated Delta Pegasi) form the large asterism known as the Square of Pegasus. Twelve star systems have been found to have exoplanets. 51 Pegasi was the first Sun-like star discovered to have an exoplanet companion.

Sombrero Galaxy

The Sombrero Galaxy (also known as Messier Object 104, M104 or NGC 4594) is a lenticular galaxy in the constellation Virgo located 9.55 Mpc (31,100,000 ly) from Earth. The galaxy has a diameter of approximately 15kpc (50,000 light-years), 30% the size of the Milky Way. It has a bright nucleus, an unusually large central bulge, and a prominent dust lane in its inclined disk. The dark dust lane and the bulge give this galaxy the appearance of a sombrero. Astronomers initially thought that the halo was small and light, indicative of a spiral galaxy, but the Spitzer Space Telescope found that the halo around the Sombrero Galaxy is larger and more massive than previously thought, indicative of a giant elliptical galaxy. The galaxy has an apparent magnitude of +8.0, making it easily visible with amateur telescopes, and it is considered by some authors to be the galaxy with the highest absolute magnitude within a radius of 10 megaparsecs of the Milky Way. Its large bulge, its central supermassive black hole, and its dust lane all attract the attention of professional astronomers.

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