NGC 7184

Last updated
NGC 7184
N7184s.jpg
NGC 7184 by Adam Block/Mount Lemmon SkyCenter
Observation data (J2000 epoch)
Constellation Aquarius
Right ascension 22h 02m 39.8s [1]
Declination −20° 48′ 46″ [1]
Redshift 0.008739 +/- 0.000010 [1]
Helio radial velocity 2620 ± 3 km/s [1]
Distance 99.3 ± 22.5 Mly (30.5 ± 6.9 Mpc) [1]
Apparent magnitude  (V)11.1
Characteristics
Type SB(r)c [1]
Apparent size  (V)6.0′ × 1.5′ [1]
Other designations
UGCA 425, ESO 601- G009, MCG -04-52-009, PGC 67904 [1]

NGC 7184 is a barred 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 7184 is about 175,000 light years across. It was discovered by William Herschel on October 28, 1783. [2]

Contents

Characteristics

NGC 7184 has a small, bright nucleus and an elliptical bulge, whose major axis is aligned with the major axis of the disk. There is a bar along the minor axis of the bulge, but the high inclination of the galaxy makes its presence uncertain. From the bar emanate two tightly wound symmetrical spiral arms that form a bright inner ring. [3] The diameter of the ring along its major axis is 1.71 arcminutes. [4] The arms feature HII regions, and as they emerge from the ring are flocculent, based on the HII distribution, while they begin to split again at the outermost part of the galaxy. [5] Dust lanes are observed in the inner part of the disk. [6]

An outlying HII region has been discovered near NGC 7184. It is located on the major axis of the optical disk, on the northeasterly receding edge. Its size is estimated to be 270 pc at the distance of the galaxy and its Hα luminosity, 1037.6 erg s−1. It could be an isolated extension of a spiral arm. [7]

Supernova

One supernova has been observed in NGC 7184, SN 1984N. It was discovered visually by Robert Evans at magnitude 14, 60" east and 65" north of the nucleus on July 20, 1984. Its discovery was confirmed by T. Cragg at the Anglo-Australian Observatory. [8] Initially it was thought to be a variable star in our galaxy, [9] but later study of the object revealed it was indeed a supernova. [10] [11] It was identified as type I. [12]

Nearby galaxies

NGC 7184 is the foremost galaxy of a small galaxy group known as the NGC 7184 group, which also includes NGC 7183. [13] A satellite galaxy lies 3 arcminutes to the south, at a projected separation of 28 kpc. [14]

Related Research Articles

<span class="mw-page-title-main">Pinwheel Galaxy</span> Galaxy in the constellation Ursa Major

The Pinwheel Galaxy is a face-on spiral galaxy 21 million light-years away from Earth in the constellation Ursa Major. It was discovered by Pierre Méchain in 1781 and was communicated that year to Charles Messier, who verified its position for inclusion in the Messier Catalogue as one of its final entries.

<span class="mw-page-title-main">Black Eye Galaxy</span> Spiral galaxy in the constellation Coma Berenices

The Black Eye Galaxy is a relatively isolated spiral galaxy 17 million light-years away in the mildly northern constellation of Coma Berenices. It was discovered by Edward Pigott in March 1779, and independently by Johann Elert Bode in April of the same year, as well as by Charles Messier the next year. A dark band of absorbing dust partially in front of its bright nucleus gave rise to its nicknames of the "Black Eye", "Evil Eye", or "Sleeping Beauty" galaxy. M64 is well known among amateur astronomers due to its form in small telescopes and visibility across inhabited latitudes.

<span class="mw-page-title-main">Messier 81</span> Grand design spiral galaxy in the constellation Ursa Major

Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away in the constellation Ursa Major. It has a D25 isophotal diameter of 29.44 kiloparsecs (96,000 light-years). Because of its relative proximity to the Milky Way galaxy, large size, and active galactic nucleus (which harbors a 70 million M☉ supermassive black hole), Messier 81 has been studied extensively by professional astronomers. The galaxy's large size and relatively high brightness also makes it a popular target for amateur astronomers. In late February 2022, astronomers reported that M81 may be the source of FRB 20200120E, a repeating fast radio burst.

<span class="mw-page-title-main">Messier 74</span> Face-on spiral galaxy in the constellation Pisces

Messier 74 is a large spiral galaxy in the equatorial constellation Pisces. It is about 32 million light-years away from Earth. The galaxy contains two clearly defined spiral arms and is therefore used as an archetypal example of a grand design spiral galaxy. The galaxy's low surface brightness makes it the most difficult Messier object for amateur astronomers to observe. Its relatively large angular size and the galaxy's face-on orientation make it an ideal object for professional astronomers who want to study spiral arm structure and spiral density waves. It is estimated that M74 hosts about 100 billion stars.

<span class="mw-page-title-main">NGC 2997</span> Galaxy in the constellation Antlia

NGC 2997 is a face-on unbarred spiral galaxy about 40 million light-years away in the faint southern constellation of Antlia. It was discovered March 4, 1793 by German-born astronomer William Herschel. J. L. E. Dreyer described it as, "a remarkable object, very faint, very large, very gradually then very suddenly bright middle and 4 arcsec nucleus. This is the brightest galaxy of the NGC 2997 group of galaxies, and was featured on the cover of the first edition of Galactic Dynamics by James Binney and Scott Tremaine.

<span class="mw-page-title-main">NGC 2207 and IC 2163</span> Pair of colliding spiral galaxies in the constellation Canis Major

NGC 2207 and IC 2163 are a pair of colliding spiral galaxies about 80 million light-years away in the constellation Canis Major. Both galaxies were discovered by John Herschel in 1835.

<span class="mw-page-title-main">NGC 1566</span> Galaxy in the constellation Dorado

NGC 1566, sometimes known as the Spanish Dancer, is an intermediate spiral galaxy in the constellation Dorado, positioned about 3.5° to the south of the star Gamma Doradus. It was discovered on May 28, 1826 by Scottish astronomer James Dunlop. At 10th magnitude, it requires a telescope to view. The distance to this galaxy remains elusive, with measurements ranging from 6 Mpc up to 21 Mpc.

<span class="mw-page-title-main">NGC 4639</span> Galaxy in the constellation Virgo

NGC 4639 is a barred spiral galaxy located in the equatorial constellation of Virgo. It was discovered by German-born astronomer William Herschel on April 12, 1784. John L. E. Dreyer described it as "pretty bright, small, extended, mottled but not resolved, 12th magnitude star 1 arcmin to southeast". This is a relatively nearby galaxy, lying approximately 72 million light-years away from the Milky Way. It is a companion to NGC 4654, and the two appear to have interacted roughly 500 million years ago. NGC 4639 is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 1808</span> Galaxy in the constellation Columba

NGC 1808 is a barred spiral galaxy located in the southern constellation of Columba, about two degrees to the south and east of Gamma Caeli. It was discovered by Scottish astronomer James Dunlop, who described it as a "faint nebula". The galaxy is a member of the NGC 1808 group, which is part of the larger Dorado Group.

<span class="mw-page-title-main">NGC 3621</span> Spiral galaxy in the constellation Hydra

NGC 3621 is a field spiral galaxy about 22 Mly (6.7 Mpc) away in the equatorial constellation of Hydra. It is comparatively bright and can be well seen in moderate-sized telescopes. The galaxy is around 93,000 ly (29,000 pc) across and is inclined at an angle of 25° from being viewed edge on. It shines with a luminosity equal to 13 billion times that of the Sun. The morphological classification is SA(s)d, which indicates this is an ordinary spiral with loosely wound arms. There is no evidence for a bulge. Although it appears to be isolated, NGC 3621 belongs to the Leo spur.

<span class="mw-page-title-main">NGC 178</span> Magellanic spiral galaxy in the constellation Cetus

NGC 178 is a Magellanic spiral galaxy in the constellation of Cetus. The compiler of the New General Catalogue, John Louis Emil Dreyer noted that NGC 178 was "faint, small, much extended 0°, brighter middle". It was discovered on November 3, 1885 by Ormond Stone.

<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 circa 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.

<span class="mw-page-title-main">Coma I</span> Galaxy cluster in constellation Coma Berenices

The Coma I Group is a group of galaxies located about 14.5 Mpc (47.3 Mly) away in the constellation Coma Berenices. The brightest member of the group is NGC 4725. The Coma I Group is rich in spiral galaxies while containing few elliptical and lenticular galaxies. Coma I lies in the foreground of the more distant Coma and Leo clusters and is located within the Virgo Supercluster.

<span class="mw-page-title-main">NGC 2336</span> Galaxy in the constellation Camelopardalis

NGC 2336 is a Barred spiral galaxy located in the constellation Camelopardalis. It is located at a distance of circa 100 million light years from Earth, which, given its apparent dimensions, means that NGC 2336 is about 200,000 light years across. It was discovered by Wilhelm Tempel in 1876.

<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 3367</span> Spiral galaxy in the constellation Leo

NGC 3367 is a barred spiral galaxy located in the constellation Leo. It is located at a distance of about 120 million light years from Earth, which, given its apparent dimensions, means that NGC 3367 is about 85,000 light years across. It was discovered by William Herschel on March 19, 1784.

<span class="mw-page-title-main">IC 5201</span> Barred spiral galaxy in the constellation of Grus

IC 5201 is a barred spiral galaxy located in the constellation Grus. It is located at a distance of about 35 million light years from Earth, which, given its apparent dimensions, means that IC 5201 is about 90,000 light years across. It was discovered by Joseph Lunt in 1900.

<span class="mw-page-title-main">NGC 691</span> Galaxy in the constellation Aries

NGC 691 is an unbarred spiral galaxy located in the constellation Aries. It is located at a distance of circa 120 million light years from Earth, which, given its apparent dimensions, means that NGC 691 is about 130,000 light years across. It was discovered by William Herschel on November 13, 1786.

<span class="mw-page-title-main">NGC 539</span> Galaxy in the constellation Cetus

NGC 539 is a barred spiral galaxy in the constellation of Cetus south. It is estimated to be 429 million light years from the Milky Way and has a diameter of approximately 200,000 ly.

<span class="mw-page-title-main">NGC 2906</span> Spiral galaxy in the constellation Leo

NGC 2906 is a spiral galaxy located in the constellation Leo. It is located at a distance of circa 120 million light years from Earth, which, given its apparent dimensions, means that NGC 2906 is about 75,000 light years across. It was discovered by William Herschel on December 28, 1785.

References

  1. 1 2 3 4 5 6 7 8 "NASA/IPAC Extragalactic Database". Results for NGC 7184. Retrieved 2016-01-18.
  2. ↑ Seligman, Courtney. "NGC 7184". Celestial Atlas. Retrieved 19 November 2018.
  3. ↑ Eskridge, Paul B.; Frogel, Jay A.; Pogge, Richard W.; Quillen, Alice C.; Berlind, Andreas A.; Davies, Roger L.; DePoy, D. L.; Gilbert, Karoline M.; Houdashelt, Mark L.; Kuchinski, Leslie E.; Ramirez, Solange V.; Sellgren, K.; Stutz, Amelia; Terndrup, Donald M.; Tiede, Glenn P. (November 2002). "Near-Infrared and Optical Morphology of Spiral Galaxies". The Astrophysical Journal Supplement Series. 143 (1): 73–111. arXiv: astro-ph/0206320 . Bibcode:2002ApJS..143...73E. doi:10.1086/342340. S2CID   15491635.
  4. ↑ Comerón, S.; Salo, H.; Laurikainen, E.; Knapen, J. H.; Buta, R. J.; Herrera-Endoqui, M.; Laine, J.; Holwerda, B. W.; Sheth, K.; Regan, M. W.; Hinz, J. L.; Muñoz-Mateos, J. C.; Gil de Paz, A.; Menéndez-Delmestre, K.; Seibert, M.; Mizusawa, T.; Kim, T.; Erroz-Ferrer, S.; Gadotti, D. A.; Athanassoula, E.; Bosma, A.; Ho, L. C. (19 February 2014). "ARRAKIS: atlas of resonance rings as known in the S4G". Astronomy & Astrophysics. 562: A121. arXiv: 1312.0866 . Bibcode:2014A&A...562A.121C. doi:10.1051/0004-6361/201321633. S2CID   119295831.
  5. ↑ Meurer, Gerhardt R.; Hanish, D. J.; Ferguson, H. C.; Knezek, P. M.; Kilborn, V. A.; Putman, M. E.; Smith, R. C.; Koribalski, B.; Meyer, M.; Oey, M. S.; Ryan-Weber, E. V.; Zwaan, M. A.; Heckman, T. M.; Kennicutt, Jr., R. C.; Lee, J. C.; Webster, R. L.; Bland-Hawthorn, J.; Dopita, M. A.; Freeman, K. C.; Doyle, M. T.; Drinkwater, M. J.; Staveley-Smith, L.; Werk, J. (July 2006). "The Survey for Ionization in Neutral Gas Galaxies. I. Description and Initial Results". The Astrophysical Journal Supplement Series. 165 (1): 307–337. arXiv: astro-ph/0604444 . Bibcode:2006ApJS..165..307M. doi:10.1086/504685. S2CID   9655238.
  6. ↑ Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington
  7. ↑ Werk, J. K.; Putman, M. E.; Meurer, G. R.; Ryan-Weber, E. V.; Kehrig, C.; Thilker, D. A.; Bland-Hawthorn, J.; Drinkwater, M. J.; Kennicutt, R. C.; Wong, O. I.; Freeman, K. C.; Oey, M. S.; Dopita, M. A.; Doyle, M. T.; Ferguson, H. C.; Hanish, D. J.; Heckman, T. M.; Kilborn, V. A.; Kim, J. H.; Knezek, P. M.; Koribalski, B.; Meyer, M.; Smith, R. C.; Zwaan, M. A. (1 January 2010). "Outlying H Ii Regions in H I-Selected Galaxies". The Astronomical Journal. 139 (1): 279–295. arXiv: 0911.1791 . Bibcode:2010AJ....139..279W. doi:10.1088/0004-6256/139/1/279. S2CID   119161733.
  8. ↑ "IAUC 3962: Prob. SN IN NGC 7184; APPULSE OF SAO 186001 TO NEPTUNE; JUPITER I (IO)". www.cbat.eps.harvard.edu.
  9. ↑ "IAUC 3994: 1983 TB; SN IN NGC 7184?". www.cbat.eps.harvard.edu.
  10. ↑ "IAUC 3995: Poss. N IN Sgr; EDITORIAL NOTICE; 1984o". www.cbat.eps.harvard.edu.
  11. ↑ "IAUC 4013: 1984t; SN IN NGC 7184". www.cbat.eps.harvard.edu.
  12. ↑ Spratt, C. E. (1987). "Visually discovered extra-galactic supernovae". Journal of the American Association of Variable Star Observers. 16 (1): 19–22. Bibcode:1987JAVSO..16...19S.
  13. ↑ 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. Archived from the original on 31 January 2016. Retrieved 12 December 2018.
  14. ↑ Zaritsky, Dennis; Smith, Rodney; Frenk, Carlos; White, Simon D. M. (20 March 1997). "More Satellites of Spiral Galaxies". The Astrophysical Journal. 478 (1): 39–48. arXiv: astro-ph/9611199 . Bibcode:1997ApJ...478...39Z. doi:10.1086/303784. S2CID   119042983.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.