Arp 7

Last updated
ARP 7
Observation data (J2000 epoch)
Constellation Hydra [1]
Right ascension 8h 50m 30.0s [2]
Declination −16° 37′ 00″ [2]
Redshift 0.018356 ± 0.000027 (5503 ± 8 km/s) [3]
Distance 19–273  Mly (5.9–83.7  Mpc) [3]
Apparent magnitude  (V)12.40 [3]
Characteristics
Type SB(rs)bc [3]
Size5,200  ly (1.6  kpc) (75,000  ly (23  kpc)?) (estimated) [lower-alpha 1] [3]
Apparent size  (V)57.1″ × 52.53″ [3]
Other designations
PGC 024836, [3] APG 7 [2]

Coordinates: Jupiter and moon.png 08h 50m 30s, −16° 37′ 00″

Arp 7 (PGC 24836) is a spiral galaxy in the constellation Hydra. [1] Redshift-independent measurements of its distance vary widely, from 5.9 Mpc to 83.7 Mpc. [3] Its morphological classification is SB(rs)bc, [3] meaning it is a barred spiral galaxy with some ring-like structure.

Contents

Arp 7 was imaged by Halton Arp and included in his Atlas of Peculiar Galaxies under the category of 'split arm' galaxies. [4] Five other galaxies are also included in this section of the atlas: Arp 8 (NGC 497), Arp 9 (NGC 2523), Arp 10 (UGC 1775), Arp 11 (UGC 717), and Arp 12 (NGC 2608).

See also

Related Research Articles

<i>Atlas of Peculiar Galaxies</i> Catalogue of peculiar galaxies produced by Halton Arp

The Atlas of Peculiar Galaxies is a catalog of peculiar galaxies produced by Halton Arp in 1966. A total of 338 galaxies are presented in the atlas, which was originally published in 1966 by the California Institute of Technology. The primary goal of the catalog was to present photographs of examples of the different kinds of peculiar structures found among galaxies.

Arp 240 Pair of interacting galaxies in the constellation Virgo

Arp 240 is a pair of interacting spiral galaxys located in the constellation Virgo. The two galaxies are listed together as Arp 240 in the Atlas of Peculiar Galaxies. The galaxy on the right is known as NGC 5257, while the galaxy on the left is known as NGC 5258. Both galaxies are distorted by the gravitational interaction, and both are connected by a tidal bridge, as can be seen in images of these galaxies.

NGC 7314 Galaxy in the constellation Piscis Austrinus

NGC 7314 is a spiral galaxy located in the southern constellation of Piscis Austrinus. It was discovered by English astronomer John Herschel on July 29, 1834. This is a nearby Seyfert (active) galaxy, located at a distance of approximately 54.6 megalight-years from the Milky Way. Since it appears to have detached spiral arm segments, it was listed in Halton Arp's Atlas of Peculiar Galaxies.

Arp 87 Pair of galaxies in the constellation Leo

Arp 87 is a pair of two interacting galaxies, NGC 3808A and NGC 3808B. They are situated in the Leo constellation. NGC 3808A, the brighter, is a peculiar spiral galaxy, while NGC 3808B is an irregular galaxy.

NGC 383 Radio galaxy in the constellation Pisces

NGC 383 is a double radio galaxy with a quasar-like appearance located in the constellation Pisces. It is listed in Halton C. Arp's 1966 "The Arp Atlas of Peculiar Galaxies." Recent discoveries by the National Radio Astronomy Observatory in 2006 reveal that NGC 383 is being bisected by high energy relativistic electrons traveling at relatively high fractions of the speed of light. These relativistic electrons are detected as synchrotron radiation in the x-ray and radio wavelengths. The focus of this intense energy is the galactic center of NGC 383. The relativistic electron jets detected as synchrotron radiation extend for several thousand parsecs and then appear to dissipate at the ends in the form of streamers or filaments.

NGC 2608 Barred spiral galaxy in the constellation Cancer

NGC 2608 is a barred spiral galaxy located 93 million light-years away in the constellation Cancer. It is 62,000 light-years across, and about 60% of the width of the Milky Way. It is considered a grand design spiral galaxy and is classified as SB(s)b, meaning that the galaxy's arms wind moderately around the prominent central bar.

NGC 3432 Interacting galaxy in the constellation Leo Minor

NGC 3432 is a spiral galaxy that can be found in the constellation Leo Minor. It is currently interacting with UGC 5983, a dwarf galaxy. Tidal filaments and intense star formation can also been seen from the interaction, which is why it was listed in Halton Arp's Atlas of Peculiar Galaxies.

NGC 14 irregular galaxy in the constellation Pegasus

NGC 14 is an irregular galaxy in the Pegasus constellation. It was included in Halton Arp's Atlas of Peculiar Galaxies, under the section "Galaxies with the appearance of fission," since the irregular appearance of this galaxy causes it to look like it is separating apart. It was discovered on September the 18th 1786 by William Herschel.

NGC 5679 Group Triplet of galaxies in the constellation Virgo

The NGC 5679 group, also known as Arp 274, is a triplet of galaxies, MCG+1-37-36, MCG+1-37-35 and MCG+1-37-34, spanning about 200000 light-years and at some 400 million light-years from Earth in the constellation Virgo. Arp 247 refers to the Atlas of Peculiar Galaxies, compiled by Halton Arp in 1966. Galaxies 269 through 274 in his catalogue are galaxies that appear to have connected arms.

Arp 273 Pair of interacting galaxies

Arp 273 is a pair of interacting galaxies, 300 million light years away in the constellation Andromeda. It was first described in the Atlas of Peculiar Galaxies, compiled by Halton Arp in 1966. The larger of the spiral galaxies, known as UGC 1810, is about five times more massive than the smaller galaxy. It has a disc that is tidally distorted into a rose-like shape by the gravitational pull of the companion galaxy below it, known as UGC 1813. The smaller galaxy shows distinct signs of active star formation at its nucleus, and "it is thought that the smaller galaxy has actually passed through the larger one."

NGC 5566 Interacting galaxy in the constellation Virgo

NGC 5566 is a barred spiral galaxy in the constellation Virgo, which is approximately 65 million light years away from Earth. The galaxy is the biggest in the constellation Virgo, stretching nearly 150,000 light years in diameter. The galaxy NGC 5566 was discovered on 30 April 1786 by the German-British astronomer William Herschel. It is included in Halton Arp's Atlas of Peculiar Galaxies.

NGC 7727 Galaxy in the constellation Aquarius

NGC 7727 is a peculiar galaxy in the constellation Aquarius.

NGC 2857 Spiral galaxy in the constellation Ursa Major

NGC 2857 is a spiral galaxy in the constellation Ursa Major. It was discovered on January 9, 1856 by R. J. Mitchell.

NGC 1169 Barred spiral galaxy in the constellation Perseus

NGC 1169 is an intermediate barred spiral galaxy in the constellation of Perseus. NGC 1169 has a reddish center, indicating the region is dominated by older stars. In contrast, the outer ring contains larger blue-white stars, a sign of recent star formation. The entire galaxy is rotating at approximately 265 km/s

UGC 8335 Pair of strongly interacting galaxies in Ursa Major

UGC 8335 is a pair of strongly interacting spiral galaxies. They have been distorted by extreme tidal forces, creating prominent tidal tails and a bridge of gas and stars between the galaxies.

NGC 169 Barred spiral galaxy in Andromeda

NGC 169 is a barred spiral galaxy located in the constellation Andromeda. It was discovered on September 18, 1857 by R. J. Mitchell.

NGC 191 Barred spiral galaxy in the constellation Cetus

NGC 191 is a spiral galaxy located in the constellation Cetus. It was discovered on November 28, 1785 by William Herschel.

NGC 341 Barred spiral galaxy in the constellation Cetus

NGC 341 is a spiral galaxy in the constellation Cetus. It was discovered on October 21, 1881 by Édouard Stephan. It was described by Dreyer as "faint, pretty large, round, a little brighter middle, mottled but not resolved." It has a companion galaxy, PGC 3627, which is sometimes called NGC 341B. For this, reason, it has been included in Halton Arp's Atlas of Peculiar Galaxies.

NGC 7603 Spiral Galaxy in the constellation of Pisces

NGC 7603 is a spiral Seyfert galaxy in the constellation Pisces. It is listed in the Atlas of Peculiar Galaxies. It is interacting with the smaller elliptical galaxy PGC 71041 nearby.

NGC 497 Barred spiral galaxy in the constellation Cetus

NGC 497 is a barred spiral galaxy approximately 336 million light-years away from Earth in the constellation of Cetus. It was discovered by French astronomer Édouard Stephan on November 6, 1882.

References

  1. 1 2 Seligman, Courtney. "Celestial Atlas: PCG Objects 24500 - 24999" . Retrieved 2015-11-25.
  2. 1 2 3 SIMBAD Astronomical Database. Results for ARP 007. Retrieved 2015-11-25.
  3. 1 2 3 4 5 6 7 8 9 "NASA/IPAC Extragalactic Database". Results for ARP 007. Archived from the original on 1997-12-22. Retrieved 2015-11-25.
  4. ↑ Arp, Halton (1966). "Atlas of Peculiar Galaxies". Figure 1. Retrieved 2015-11-25.

Notes

  1. ↑ Calculated from apparent size and distance:


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