NGC 7318

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NGC 7318
NGC 7318.jpg
NGC 7318. 8-micrometre infrared light = red, H-alpha = green, visible red light = blue. NGC 7318b is the upper galaxy, NGC 7318a is the lower galaxy.
Observation data (J2000 epoch)
Constellation Pegasus
Right ascension 22h 35m 56.7s / 22h 35m 58.4s
Declination +33° 57′ 56″ / +33° 57′ 57″
Redshift 6630 ± 23 / 5774 ± 24 km/s
Distance 85 Mpc [1]
Apparent magnitude  (V)14.4 / 13.9
Characteristics
Type E2 pec / SB(s)bc pec
Apparent size  (V)0.9′ × 0.9′ / 1.9′ × 1.2′
Notable features Colliding galaxies
Other designations
  • NGC 7318A / 7318B
  • UGC 12099 / 12100
  • Arp 319
  • PGC 69260 / 69263
  • HCG 92D / 92B
References: [2]
The location of NGC 7318 (circled in blue) NGC7318Location.png
The location of NGC 7318 (circled in blue)

NGC 7318 (also known as UGC 12099/UGC 12100 or HCG 92d/b) is a pair of colliding galaxies about 280 million light-years from Earth. [1] They appear in the Constellation Pegasus and are members of Stephan's Quintet. [3]

The Spitzer Space Telescope revealed the presence of a large intergalactic shock wave, shown by an arc produced by NGC 7318b colliding with the group at ≥ 900 km/sec. [4] As NGC 7318b collides with NGC 7318a, atoms of hydrogen in the cluster's gas are heated by the shock wave, producing the green glow. The molecular hydrogen visible in the collision is one of the most turbulent forms known. This phenomenon was discovered by an international team of scientists of the Max Planck Institute for Nuclear Physics (MPIK) in Heidelberg. This collision can help provide a view into what happened in the early universe, around 10 billion years ago.

Related Research Articles

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<span class="mw-page-title-main">Stephan's Quintet</span> Visual grouping of five galaxies

Stephan's Quintet is a visual grouping of five galaxies of which four form the first compact galaxy group ever discovered. The group, visible in the constellation Pegasus, was discovered by Édouard Stephan in 1877 at the Marseille Observatory. The group is the most studied of all the compact galaxy groups. The brightest member of the visual grouping is NGC 7320, which has extensive H II regions, identified as red blobs, where active star formation is occurring.

<span class="mw-page-title-main">NGC 4631</span> Galaxy in the constellation Canes Venatici

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<span class="mw-page-title-main">Robert's Quartet</span> Compact galaxy group in the constellation of Phoenix

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<span class="mw-page-title-main">Interacting galaxy</span> Galaxies with interacting gravitational fields

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<span class="mw-page-title-main">NGC 6872</span> Galaxy in the constellation Pavo

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<span class="mw-page-title-main">NGC 7319</span> Galaxy in the constellation Pegasus

NGC 7319 is a highly distorted barred spiral galaxy that is a member of the compact Stephan's Quintet group located in the constellation Pegasus, some 311 megalight-years distant from the Milky Way. The galaxy's arms, dust and gas have been highly disturbed as a result of the interaction with the other members of the Quintet. Nearly all of the neutral hydrogen has been stripped from this galaxy, most likely as a result of a collision with NGC 7320c some 100 million years ago. A pair of long, parallel tidal tails extend southward from NGC 7319 in the direction of NGC 7320c, and is undergoing star formation.

<span class="mw-page-title-main">NGC 5820</span> Galaxy in the constellation Boötes

NGC 5820 is a lenticular galaxy in the constellation Boötes. It lies near NGC 5821, a galaxy with a similar mass at the same redshift.

<span class="mw-page-title-main">NGC 5753</span> Galaxy in the constellation Boötes

NGC 5753 is a spiral galaxy in the constellation Boötes. This is a member of the Arp 297 interacting galaxies group of four: NGC 5752, NGC 5753, NGC 5754, NGC 5755.

<span class="mw-page-title-main">NGC 5755</span> Galaxy in the constellation Boötes

NGC 5755 is a barred spiral galaxy in the constellation Boötes, member of Arp 297 interacting galaxies group of four: NGC 5752, NGC 5753, NGC 5754, and NGC 5755.

<span class="mw-page-title-main">NGC 5754</span> Galaxy in the constellation Boötes

NGC 5754 is a barred spiral galaxy located 218 million light years away in the constellation Boötes. It is a member of the Arp 297 interacting galaxies group, which consists of NGC 5752, NGC 5753, NGC 5754, NGC 5755. Along with NGC 2718 and UGC 12158, NGC 5754 is often considered a Milky Way-twin.

<span class="mw-page-title-main">NGC 5752</span> Galaxy in the constellation Boötes

NGC 5752 is a spiral galaxy in the constellation Boötes. It is a member of the Arp 297 interacting galaxies group which comprises four galaxies: NGC 5752, NGC 5753, NGC 5754, NGC 5755.

<span class="mw-page-title-main">NGC 23</span> Galaxy in the constellation Pegasus

NGC 23 is a spiral galaxy located in the northern constellation of Pegasus, around 173.5 megalight-years distant from the Milky Way. It was discovered by William Herschel on 10 September 1784. In the Webb Society Deep-Sky Observer's Handbook, the visual appearance of NGC 23 is described as follows:

Bright, extended ellipse; a bright nuclear structure is noticeably elongated; two weak spiral enhancements emerge from opposite sides of the nucleus, one curving towards a bright star attached on the south end. The galaxy is likely interacting with NGC 9.

<span class="mw-page-title-main">UGC 2885</span> Large barred spiral galaxy in the constellation Perseus

UGC 2885 is a large barred spiral galaxy of type SA(rs)c in the constellation Perseus. It is 232 million light-years (71 Mpc) from Earth and measures 463,000 ly (142,000 pc) across, making it one of the largest known spiral galaxies. It is also a possible member of the Pisces-Perseus supercluster.

<span class="mw-page-title-main">NGC 2623</span> Interacting galaxy in the constellation Cancer

NGC 2623/Arp 243 is an interacting galaxy located in the constellation Cancer. NGC 2623 is the result of two spiral galaxies that have merged. Scientists believe that this situation is similar to what will occur to the Milky Way, which contains the Solar System, and the neighboring galaxy, the Andromeda Galaxy in four billion years. Studying this galaxy and its properties have provided scientists with a better idea of the coming collision of the Milky Way and the Andromeda. Due to NGC 2623 being in the late stage of merging, the compression of the gas within the galaxy has led to a large amount of star formation, and to its unique structure of a bright core with two extending tidal tails.

<span class="mw-page-title-main">NGC 7213</span> Galaxy in the constellation Grus

NGC 7213 is a lenticular galaxy located in the constellation Grus. It is located at a distance of circa 70 million light-years from Earth, which, given its apparent dimensions, means that NGC 7213 is about 75,000 light-years across. It was discovered by John Herschel on September 30, 1834. It is an active galaxy with characteristics between a type I Seyfert galaxy and LINER.

<span class="mw-page-title-main">NGC 877</span> Galaxy located in the constellation Aries

NGC 877 is an intermediate spiral galaxy located in the constellation Aries. It is located at a distance of circa 160 million light years from Earth, which, given its apparent dimensions, means that NGC 877 is about 115,000 light years across. It was discovered by William Herschel on October 14, 1784. It interacts with NGC 876.

<span class="mw-page-title-main">NGC 1142</span> Interacting and distorted spiral galaxy in the constellation Cetus

NGC 1142 is a distorted spiral galaxy in the constellation of Cetus. It is located about 370 million light years away from Earth, which means, given its apparent dimensions, that NGC 1142 is approximately 170,000 light years across. It is a type 2 Seyfert galaxy. It interacts with the elliptical galaxy NGC 1141.

References

  1. 1 2 Duc, Pierre-Alain; Cuillandre, Jean-Charles; Renaud, Florent (March 2018). "Revisiting Stephan's Quintet with deep optical images". Monthly Notices of the Royal Astronomical Society: Letters. 475 (1): L40–L44. arXiv: 1712.07145 . Bibcode:2018MNRAS.475L..40D. doi:10.1093/mnrasl/sly004 . Retrieved 9 February 2021.
  2. ↑ "NASA/IPAC Extragalactic Database". Results for NGC 7318a / 7318b. Retrieved 2006-10-23.
  3. ↑ Arp, Halton (July 1973). "Stephan's Quintet of Interacting Galaxies". Astrophysical Journal. 183: 411–440. Bibcode:1973ApJ...183..411A. doi:10.1086/152236 . Retrieved 9 February 2021.
  4. ↑ Xu, C. K.; Appleton, P. N.; Dopita, M.; Gao, Y.; Lu, N. Y.; Popescu, C.; Reach, W. T.; Sulentic, J.; Tuffs, R.; Yun, M. (March 2008). "Spitzer Observations of Stephan's Quintet -- IGM Dust and Gas in a Multi-galaxy Collision". The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series. 381: 88. Bibcode:2008ASPC..381...88X . Retrieved 9 February 2021.


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