NGC 7496 explained

NGC 7496
Epoch:J2000
Type:(R':)SB(rs)bc [1]
Dist Ly:61 Mly (18.7 Mpc)
Z:0.005500 ± 0.000018
H Radial V:1,649 ± 5 km/s
Appmag V:11.1
Size V:3.3 × 3.0
Constellation Name:Grus
Notes:Seyfert galaxy, starburst galaxy

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.[2] It is a type 2 Seyfert galaxy with high star formation rate around the nucleus.[3]

Characteristics

The nucleus of the galaxy has been found to be active and it has been categorised as a type 2 Seyfert galaxy. The nucleus has fairly strong emission lines in the optical wavelengths and an intense source of ultraviolet radiation. The spectrum also revealed the presence of an HII region in the nucleus, indicating the presence of young hot stars. The nucleus is also a source of radio waves.[4] The most accepted theory for the energy source of active galactic nuclei is the presence of an accretion disk around a supermassive black hole.

NGC 7496 was one of the first galaxies to be examined by the James Webb Space Telescope, in June 2022, as part of the Physics at High Angular resolution in Nearby GalaxieS (PHANGS)–JWST survey, whose goal was to study star formation and the interstellar medium in nearby galaxies.[5] The mid infrared images revealed filaments and cavities created by the stellar wind of young stars. Imaging of 3.3 μm polycyclic aromatic hydrocarbons (PAH) emission, which is caused the ultraviolet radiation being reprossesed by dust, revealed the presence of 67 candidate star clusters embedded in dust. The age of these clusters was estimated to be less than 2 million years while their mass was estimated to be 104–105 . Their location was also correlated with H-alpha and CO(2–1) emission.[6]

Clumpy ultraviolet emission has been observed from the spiral arms of the galaxy. Massive stellar complexes are present in the north arm and regions with young stellar complexes are present in the end of both arms. The age of the stars in these complexes is estimated to be less than 200 million years. Photometry in various wavelengths indicates that there is very cold dust in the galaxy.[7]

Nearby galaxies

NGC 7496 is a member of the NGC 7582 galaxy group. Other members of the group include NGC 7552, NGC 7582, NGC 7590, and NGC 7599, which are also known as the Grus Quartet,[8] NGC 7531, NGC 7632, and IC 5325.[9] 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

External links

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 7496 . 2019-01-18 .
  2. Web site: Seligman. Courtney. NGC 7496 (= PGC 68165). Celestial Atlas. 19 November 2018.
  3. Schmitt . H. R. . Calzetti . D. . Armus . L. . Giavalisco . M. . Heckman . T. M. . Kennicutt . R. C. Jr.. Leitherer . C. . Meurer . G. R. . Multiwavelength Star Formation Indicators: Observations . The Astrophysical Journal Supplement Series . May 2006 . 164 . 1 . 52–80 . 10.1086/501529. free . astro-ph/0602063 .
  4. Kinney . A. L. . Bohlin . R. C. . Calzetti . D. . Panagia . N. . Wyse . Rosemary F. G. . An atlas of ultraviolet spectra of star-forming galaxies . The Astrophysical Journal Supplement Series . May 1993 . 86 . 5 . 10.1086/191771. free .
  5. Lee . Janice C. . Sandstrom . Karin M. . Leroy . Adam K. . Thilker . David A. . Schinnerer . Eva . Rosolowsky . Erik . Larson . Kirsten L. . Egorov . Oleg V. . Williams . Thomas G. . Schmidt . Judy . Emsellem . Eric . Anand . Gagandeep S. . Barnes . Ashley T. . Belfiore . Francesco . Bešlić . Ivana . Bigiel . Frank . Blanc . Guillermo A. . Bolatto . Alberto D. . Boquien . Médéric . Brok . Jakob den . Cao . Yixian . Chandar . Rupali . Chastenet . Jérémy . Chevance . Mélanie . Chiang . I-Da . Congiu . Enrico . Dale . Daniel A. . Deger . Sinan . Eibensteiner . Cosima . Faesi . Christopher M. . Glover . Simon C. O. . Grasha . Kathryn . Groves . Brent . Hassani . Hamid . Henny . Kiana F. . Henshaw . Jonathan D. . Hoyer . Nils . Hughes . Annie . Jeffreson . Sarah . Jiménez-Donaire . María J. . Kim . Jaeyeon . Kim . Hwihyun . Klessen . Ralf S. . Koch . Eric W. . Kreckel . Kathryn . Kruijssen . J. M. Diederik . Li . Jing . Liu . Daizhong . Lopez . Laura A. . Maschmann . Daniel . Chen . Ness Mayker . Meidt . Sharon E. . Murphy . Eric J. . Neumann . Justus . Neumayer . Nadine . Pan . Hsi-An . Pessa . Ismael . Pety . Jérôme . Querejeta . Miguel . Pinna . Francesca . Rodríguez . M. Jimena . Saito . Toshiki . Sánchez-Blázquez . Patricia . Santoro . Francesco . Sardone . Amy . Smith . Rowan J. . Sormani . Mattia C. . Scheuermann . Fabian . Stuber . Sophia K. . Sutter . Jessica . Sun . Jiayi . Teng . Yu-Hsuan . Treß . Robin G. . Usero . Antonio . Watkins . Elizabeth J. . Whitmore . Bradley C. . Razza . Alessandro . The PHANGS–JWST Treasury Survey: Star Formation, Feedback, and Dust Physics at High Angular Resolution in Nearby GalaxieS . The Astrophysical Journal Letters . 1 February 2023 . 944 . 2 . L17 . 10.3847/2041-8213/acaaae. free . 2212.02667 .
  6. Rodríguez . M. Jimena . Lee . Janice C. . Whitmore . B. C. . Thilker . David A. . Maschmann . Daniel . Chandar . Rupali . Deger . Sinan . Boquien . Médéric . Dale . Daniel A. . Larson . Kirsten L. . Williams . Thomas G. . Kim . Hwihyun . Schinnerer . Eva . Rosolowsky . Erik . Leroy . Adam K. . Emsellem . Eric . Sandstrom . Karin M. . Kruijssen . J. M. Diederik . Grasha . Kathryn . Watkins . Elizabeth J. . Barnes . Ashley. T. . Sormani . Mattia C. . Kim . Jaeyeon . Anand . Gagandeep S. . Chevance . Mélanie . Bigiel . F. . Klessen . Ralf S. . Hassani . Hamid . Liu . Daizhong . Faesi . Christopher M. . Cao . Yixian . Belfiore . Francesco . Pessa . Ismael . Kreckel . Kathryn . Groves . Brent . Pety . Jérôme . Indebetouw . Rémy . Egorov . Oleg V. . Blanc . Guillermo A. . Saito . Toshiki . Hughes . Annie . PHANGS–JWST First Results: Dust-embedded Star Clusters in NGC 7496 Selected via 3.3 μm PAH Emission . The Astrophysical Journal Letters . 1 February 2023 . 944 . 2 . L26 . 10.3847/2041-8213/aca653. free . 11383/2171016 . free .
  7. Singh . Swapnil . Ashby . M L N . Vig . Sarita . Ghosh . S K . Jarrett . T . Crawford . T M . Malkan . Matthew A . Archipley . M . Vieira . J D . The cold dust content of the nearby galaxies IC 5325, NGC 7496, NGC 7590, and NGC 7599 . Monthly Notices of the Royal Astronomical Society . 12 May 2021 . 504 . 3 . 4143–4159 . 10.1093/mnras/stab1048. free . 2104.06236 .
  8. Book: Bakich, Michael E.. 1,001 Celestial Wonders to See Before You Die. 2010. Springer Science+Business Media, LLC. New York, New York. 978-1-4419-1777-5. 334. 2010ocws.book.....B.
  9. Makarov. Dmitry. Karachentsev. Igor. Galaxy groups and clouds in the local (z~ 0.01) Universe. Monthly Notices of the Royal Astronomical Society. 21 April 2011. 412. 4. 2498–2520. 10.1111/j.1365-2966.2010.18071.x. 2011MNRAS.412.2498M. 1011.6277. 119194025. 20 January 2019. 31 January 2016. https://web.archive.org/web/20160131020344/http://www.sao.ru/hq/dim/groups/galaxies.dat. dead.
  10. Fouque, P.; Proust, D.; Quintana, H.; Ramirez, A.. Dynamics of the Pavo-Indus and Grus Clouds of Galaxies. Astronomy and Astrophysics Supplement Series. 100. 3. 493–500. 1993A&AS..100..493F. Proust. D.. Quintana. H.. Ramirez. A.. 1993.

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