NGC 7531

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NGC 7531
NGC 7531 legacy dr10.jpg
NGC 7531 by legacy surveys
Observation data (J2000 epoch)
Constellation Grus
Right ascension 23h 14m 48.5s [1]
Declination −43° 35′ 59.8″ [1]
Redshift 0.005324 ± 0.000010 [1]
Heliocentric radial velocity 1,596 ± 3 km/s [1]
Distance 72.4 ± 16 Mly (22.2 ± 4.9 Mpc) [1]
Apparent magnitude  (V)11.3
Characteristics
Type SAB(r)bc [1]
Apparent size  (V)4.5′ × 1.8′ [1]
Other designations
ESO 291- G010, AM 2312-435, MCG -07-47-025, PGC 70800 [1]

NGC 7531 is an intermediate spiral galaxy located in the constellation Grus. It is located at a distance of about 70 million light-years from Earth, which, given its apparent dimensions, means that NGC 7531 is about 95,000 light years across. [1] It was discovered by John Herschel on September 2, 1836. [2]

Contents

Characteristics

The inner region of NGC 7531 is characterised by a high surface brightness ring. The ring is a place of active star formation and a number of star clusters and H II regions have been identified in it. [3] The star formation rate of the inner ring is estimated to be 0.41 ± 0.12 M☉ per year based on H-alpha emission. [4] A weak bar is observed in the near infrared inside the ring, along with dust lanes. Yet, the motions at the inner ring are predominately circular. The inner ring may lie at the location of the inner Lindblad resonance. [3]

The galaxy has two patchy spiral arms that are relatively well defined but are of low surface brightness. H II regions have also been observed at the spiral arms of the galaxy, where there is also active star formation, which is more intense at the southwest region. [3] A supermassive black hole is believed to lie in the centre of the galaxy whose mass is estimated to be 3–48 million (107.07±0.61) M☉, based on the spiral arm pitch angle. [5] The galaxy is seen with an inclination of 66°. [3]

One supernova has been observed in NGC 7531, SN 2012dj. It was a type Ib/c supernova with a peak magnitude of 15.3. [6]

Nearby galaxies

In long exposure photographic plates of the galaxy, a large low surface brightness region structure was observed 2.6 arcminutes west from the nucleus of the galaxy, that has more than half the apparent diameter of NGC 7531. [3] It has been identified as a stellar cloud that may be a dwarf satellite of the galaxy or a shell created by the tidal disruption of NGC 7531. [7]

NGC 7531 is a member of the NGC 7582 galaxy group. [8] Other members of the group include NGC 7552, NGC 7582, NGC 7590, and NGC 7599, which are also known as the Grus Quartet, [9] NGC 7496, NGC 7632, and IC 5325. [8] This group, along with the group centred around IC 1459 form the Grus cloud, a region of elevated galaxy density. The Grus cloud, along with the nearby Pavo-Indus cloud, lies between the Local Supercluster and Pavo–Indus Supercluster. [10]

See also

NGC 7531 (2MASS) NGC 7531 2MASS.jpg
NGC 7531 (2MASS)

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<span class="mw-page-title-main">Pavo–Indus Supercluster</span> Neighboring supercluster in the constellations Pavo, Indus and Telescopium

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<span class="mw-page-title-main">NGC 7020</span> Galaxy in the constellation Pavo

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<span class="mw-page-title-main">NGC 4274</span> Galaxy in the constellation Coma Berenices

NGC 4274 is a barred spiral galaxy located in the constellation Coma Berenices. It is located at a distance of circa 45 million light years from Earth, which, given its apparent dimensions, means that NGC 4274 is about 95,000 light years across. It was discovered by William Herschel in 1785.

<span class="mw-page-title-main">NGC 7079</span> Galaxy in the constellation of Grus

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<span class="mw-page-title-main">NGC 4699</span> Spiral galaxy in the constellation Virgo

NGC 4699 is an intermediate spiral galaxy located in the constellation Virgo. It is located at a distance of about 65 million light years from Earth, which, given its apparent dimensions, means that NGC 4699 is about 85,000 light years across. It was discovered by William Herschel in 1786. It is a member of the NGC 4699 Group of galaxies, which is a member of the Virgo II Groups, a series of galaxies and galaxy clusters strung out from the southern edge of the Virgo Supercluster.

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NGC 2280 is a spiral galaxy located in the constellation Canis Major. It is located at a distance of circa 75 million light years from Earth, which, given its apparent dimensions, means that NGC 2280 is about 135,000 light years across. It was discovered by John Herschel on February 1, 1835.

<span class="mw-page-title-main">NGC 7606</span> Galaxy in the constellation Aquarius

NGC 7606 is a spiral galaxy located in the constellation Aquarius. It is located at a distance of circa 100 million light years from Earth, which, given its apparent dimensions, means that NGC 7606 is about 165,000 light years across. It was discovered by William Herschel on September 28, 1785. The galaxy is included in the Herschel 400 Catalogue. It lies 45 arcminutes northeast from psi2 Aquarii. It can be seen with a 4 inch telescope but its visibility is greatly affected by light pollution.

<span class="mw-page-title-main">NGC 2835</span> Spiral galaxy in the constellation Hydra

NGC 2835 is an intermediate spiral galaxy located in the constellation Hydra. It is located at a distance of circa 35 million light years from Earth, which, given its apparent dimensions, means that NGC 2835 is about 65,000 light years across. It was discovered by Wilhelm Tempel on April 13, 1884. NGC 2835 is located only 18.5 degrees from the galactic plane.

<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">IC 1459</span> Elliptical galaxy in the constellation of Grus

IC 1459 is an elliptical galaxy located in the constellation Grus. It is located at a distance of circa 85 million light-years from Earth, which, given its apparent dimensions, means that IC 1459 is about 130,000 light-years across. It was discovered by Edward Emerson Barnard in 1892.

<span class="mw-page-title-main">NGC 7418</span> Galaxy in the constellation Grus

NGC 7418 is an intermediate spiral galaxy located in the constellation Grus. It is located at a distance of circa 60 million light-years from Earth, which, given its apparent dimensions, means that NGC 7418 is about 60,000 light-years across. It was discovered by John Herschel on August 30, 1834.

The Telescopium−Grus Cloud is a galaxy filament in the constellations of Pavo, Indus, and Telescopium. It was first defined by astronomer Brent Tully in his book The Nearby Galaxies Atlas and its companion book The Nearby Galaxies Catalog.

<span class="mw-page-title-main">NGC 7496</span> Galaxy in the constellation Grus

NGC 7496 is a barred spiral galaxy located in the constellation Grus. It is located at a distance of about 60 million light-years from Earth, which, given its apparent dimensions, means that it is 75,000 light years across. It was discovered by John Herschel on September 5, 1834. It is a type 2 Seyfert galaxy with high star formation rate around the nucleus.

<span class="mw-page-title-main">NGC 1253</span> Spiral galaxy in the constellation Eridanus

NGC 1253 is a spiral galaxy in the constellation Eridanus. The galaxy lies about 70 million light years away from Earth, which means, given its apparent dimensions, that NGC 1253 is approximately 110,000 light years across. It was discovered by William Herschel on September 20, 1784.

References

  1. 1 2 3 4 5 6 7 8 9 "NASA/IPAC Extragalactic Database". Results for NGC 7531. Retrieved 2019-01-18.
  2. ↑ Seligman, Courtney. "NGC 7531 (= PGC 68165)". Celestial Atlas. Retrieved 19 November 2018.
  3. 1 2 3 4 5 Buta, R. (May 1987). "The structure and dynamics of ringed galaxies. III - Surface photometry and kinematics of the ringed nonbarred spiral NGC 7531". The Astrophysical Journal Supplement Series. 64: 1. Bibcode:1987ApJS...64....1B. doi:10.1086/191190.
  4. ↑ Grouchy, R. D.; Buta, R. J.; Salo, H.; Laurikainen, E. (1 June 2010). "Ring star formation rates in barred and nonbarred galaxies". The Astronomical Journal. 139 (6): 2465–2493. arXiv: 1004.5063 . Bibcode:2010AJ....139.2465G. doi:10.1088/0004-6256/139/6/2465. S2CID   119099302.
  5. ↑ Davis, Benjamin L.; Berrier, Joel C.; Johns, Lucas; Shields, Douglas W.; Hartley, Matthew T.; Kennefick, Daniel; Kennefick, Julia; Seigar, Marc S.; Lacy, Claud H. S. (20 June 2014). "The Black Hole Mass Function Derived from Local Spiral Galaxies". The Astrophysical Journal. 789 (2): 124. arXiv: 1405.5876 . Bibcode:2014ApJ...789..124D. doi:10.1088/0004-637X/789/2/124. S2CID   119302157.
  6. ↑ List of Supernovae IAU Central Bureau for Astronomical Telegrams. Retrieved 29 December 2015.
  7. ↑ Martínez-Delgado, David; Gabany, R. Jay; Crawford, Ken; Zibetti, Stefano; Majewski, Steven R.; Rix, Hans-Walter; Fliri, Jürgen; Carballo-Bello, Julio A.; Bardalez-Gagliuffi, Daniella C.; Peñarrubia, Jorge; Chonis, Taylor S.; Madore, Barry; Trujillo, Ignacio; Schirmer, Mischa; McDavid, David A. (1 October 2010). "Stellar tidal streams in spiral galaxies of the local volume: a pilot survey with modest aperture telescopes". The Astronomical Journal. 140 (4): 962–967. arXiv: 1003.4860 . Bibcode:2010AJ....140..962M. doi:10.1088/0004-6256/140/4/962. S2CID   43034946.
  8. 1 2 Makarov, Dmitry; Karachentsev, Igor (21 April 2011). "Galaxy groups and clouds in the local (z~ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv: 1011.6277 . Bibcode:2011MNRAS.412.2498M. doi: 10.1111/j.1365-2966.2010.18071.x . S2CID   119194025.
  9. ↑ Bakich, Michael E. (2010). 1,001 Celestial Wonders to See Before You Die. New York, New York: Springer Science+Business Media, LLC. p. 334. Bibcode:2010ocws.book.....B. ISBN   978-1-4419-1777-5.
  10. ↑ Fouque, P.; Proust, D.; Quintana, H.; Ramirez, A.; Proust, D.; Quintana, H.; Ramirez, A. (1993). "Dynamics of the Pavo-Indus and Grus Clouds of Galaxies" (PDF). Astronomy and Astrophysics Supplement Series. 100 (3): 493–500. Bibcode:1993A&AS..100..493F.{{cite journal}}: CS1 maint: multiple names: authors list (link)


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