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  • 21 Aug, 2019

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NGC 1275
NGC 1275 (also known as Perseus A or Caldwell 24) is a type 1.5 Seyfert galaxy located around 237 million light-years away in the direction of the constellation Perseus. NGC 1275 is a member of the large Perseus Cluster of galaxies.

Properties

NGC 1275 consists of two galaxies, a central type-cD galaxy in the Perseus Cluster, and a so-called high velocity system (HVS) which lies in front of it. The HVS is moving at 3000 km/s towards the dominant system, and is believed to be merging with the Perseus Cluster. The HVS is not affecting the cD galaxy as it lies at least 200 thousand light years from it. However tidal interactions are disrupting it and the ram pressure produced by its interaction with the intracluster medium of Perseus is stripping its gas as well as producing large amounts of star formation within it.

Wide multi-wavelength composite view of NGC 1275. An active supermassive black hole in the galaxy powers strong jets of particles into the Perseus Cluster, causing the gas present to reach 60 million degrees Celsius and emit X-ray light (in blue).

The central cluster galaxy contains a massive network of spectral line emitting filaments, which apparently are being dragged out by rising bubbles of relativistic plasma generated by the central active galactic nucleus. Long gaseous filaments made up of threads of gas stretch out beyond the galaxy, into the multimillion-degree, X-ray–emitting gas that fills the cluster. The amount of gas contained in a typical thread is approximately one million times the mass of the Sun. They are only 200 light-years wide, are often very straight, and extend for up to 20,000 light-years.

The existence of the filaments poses a problem. As they are much cooler than the surrounding intergalactic cloud, it is unclear how they have existed for such a long time, or why they have not warmed, dissipated or collapsed to form stars. One possibility is that weak magnetic fields (about one-ten-thousandth the strength of Earth's field) exert enough force on the ions within the threads to keep them together.

NGC 1275 contains 13 billion solar masses of molecular hydrogen that seems to be infalling from Perseus' intracluster medium in a cooling flow, both feeding its active nucleus and fueling significant amounts of star formation

The presence of an active nucleus demonstrates that a supermassive black hole is present in NGC 1275's center. The black hole is surrounded by a rotating disk of molecular gas. High-resolution observations of the rotation of this disk obtained using adaptive optics at the Gemini North telescope indicate a central mass of approximately 800 million solar masses, including both the mass of the black hole and of the inner core of the gas disk.

Supernovae

Three supernovae have been observed in NGC 1275:

  • SN 1968A (type unknown, mag. 15.5) was discovered by Miklos Lovas on 25 January 1968.
  • SN 2005mz (type Ia, mag. 18.2) was discovered by Jack Newton, M. Peoples, and Tim Puckett on 31 December 2005.
  • SN 2024xav (type II-P, mag. 18.63) was discovered by GOTO on 2 October 2024.

References

The location of NGC 1275 (circled in red)
  1. ^ "NASA/IPAC Extragalactic Database". Results for NGC 1275. Retrieved 19 November 2006.
  2. ^ "Distance Results for NGC 1275". NASA/IPAC Extragalactic Database. Retrieved 31 March 2010.
  3. ^ Ho LC, Filippenko AV, Sargent WL (October 1997). "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement. 112 (2): 315–390. arXiv:astro-ph/9704107. Bibcode:1997ApJS..112..315H. doi:10.1086/313041. S2CID 17086638.
  4. ^ Minkowski R (1957). "Optical investigations of radio sources (Introductory Lecture)". Radio Astronomy. 4: 107. Bibcode:1957IAUS....4..107M.
  5. ^ Gillmon K, Sanders JS, Fabian AC (2003). "An X-ray absorption analysis of the high-velocity system in NGC 1275". Monthly Notices of the Royal Astronomical Society. 348: 159–164. arXiv:astro-ph/0310784. doi:10.1111/j.1365-2966.2004.07336.x.
  6. ^ Gallagher JS, Lee M, Canning R, Fabian A, O'Connell RW, Sanders J, et al. (2010). "Dusty Gas and New Stars: Disruption of the High Velocity Intruder Galaxy Falling Towards NGC 1275". Bulletin of the American Astronomical Society. 42: 552. Bibcode:2010AAS...21536308G.
  7. ^ Lynds R (March 1970). "Improved Photographs of the NGC 1275 Phenomenon". The Astrophysical Journal. 159: L151. Bibcode:1970ApJ...159L.151L. doi:10.1086/180500. ISSN 0004-637X.
  8. ^ Hatch NA, Crawford CS, Fabian AC, Johnstone RM (2005). "On the origin and excitation of the extended nebula surrounding NGC 1275". Monthly Notices of the Royal Astronomical Society. 367 (2): 433–448. arXiv:astro-ph/0512331. doi:10.1111/j.1365-2966.2006.09970.x. ISSN 0035-8711.
  9. ^ "Hubble Sees Magnetic Monster in Erupting Galaxy". Newswise. 20 August 2008. Retrieved 21 August 2008.
  10. ^ Fabian AC, Johnstone RM, Sanders JS, Conselice CJ, Crawford CS, Gallagher JS, et al. (21 August 2008). "Magnetic support of the optical emission line filaments in NGC 1275". Nature. 454 (7207): 968–970. arXiv:0808.2712. Bibcode:2008Natur.454..968F. doi:10.1038/nature07169. PMID 18719583. S2CID 4321500.
  11. ^ Chang K (21 August 2008). "Hubble Images Solve Galactic Filament Mystery". The New York Times.
  12. ^ Lim J, Ao YP, Dinh-v-Trung DV (2008). "Radially Inflowing Molecular Gas in NGC 1275 Deposited by an X-Ray Cooling Flow in the Perseus Cluster". The Astrophysical Journal. 672 (1): 252–265. arXiv:0712.2979. Bibcode:2008ApJ...672..252L. doi:10.1086/523664. S2CID 119249662.
  13. ^ O'Connell R (2007). "Star Formation in the Perseus Cluster Cooling Flow". HST Proposal ID #11207. Cycle 16: 11207. Bibcode:2007hst..prop11207O.
  14. ^ Wilman RJ, Edge AC, Johnstone RM (2005). "The nature of the molecular gas system in the core of NGC 1275". Monthly Notices of the Royal Astronomical Society. 359 (2): 755–764. arXiv:astro-ph/0502537. Bibcode:2005MNRAS.359..755W. doi:10.1111/j.1365-2966.2005.08956.x. S2CID 18190288.
  15. ^ Scharwächter J, McGregor PJ, Dopita MA, Beck TL (2013). "Kinematics and excitation of the molecular hydrogen accretion disc in NGC 1275". Monthly Notices of the Royal Astronomical Society. 429 (3): 2315. arXiv:1211.6750. Bibcode:2013MNRAS.429.2315S. doi:10.1093/mnras/sts502. S2CID 119177559.
  16. ^ Marsden BG (29 January 1968). "Circular No. 2051". Central Bureau for Astronomical Telegrams. Smithsonian Astrophysical Observatory. Retrieved 2 December 2024.
  17. ^ "SN 1968A". Transient Name Server. IAU. Retrieved 29 March 2023.
  18. ^ Luckas P, Trondal O, Schwartz M, Newton J, Puckett T, Peoples M, et al. (2006). "Supernovae 2005my, 2005mz, 2005na". International Astronomical Union Circular (8655): 1. Bibcode:2006IAUC.8655....1L.
  19. ^ "SN 2005mz". Transient Name Server. IAU. Retrieved 29 March 2023.
  20. ^ "SN 2024xav". Transient Name Server. IAU. Retrieved 28 August 2024.
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