NGC 3445

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NGC 3445
Arp 24 Hubble.jpg
NGC 3445 by Hubble Space Telescope
Observation data (J2000 epoch)
Constellation Ursa Major
Right ascension 10h 54m 35.5s [1]
Declination +56° 59′ 26″ [1]
Redshift 0.006831 ± 0.000003 [1]
Heliocentric radial velocity 2,048 ± 1 km/s [1]
Distance 73.8 ± 20.1 Mly (22.6 ± 6.2 Mpc) [1]
Apparent magnitude  (V)12.3 [2]
Characteristics
Type SAB(s)m [1]
Apparent size  (V)1.6′ × 1.5′ [1]
Notable features Interacting galaxy
Other designations
UGC 6021, Arp 24, VV 14a, MCG +10-16-023, IRAS 10515+5715, PGC 32772, 7C 1051+5715

NGC 3445 is a Magellanic spiral galaxy in the constellation Ursa Major. The galaxy lies about 75 million light years away from Earth, which means, given its apparent dimensions, that NGC 3445 is approximately 35,000 light years across. [1] It was discovered by William Herschel on April 8, 1793. [3]

Contents

Characteristics

The galaxy is included in Halton Arp's Atlas of Peculiar Galaxies in the one-armed spiral galaxies category. The galaxy has a thick arm pattern with many HII regions. [4] A large spiral arm is visible at the south part of the galaxy while a weaker one is visible in infrared at the north. Radio emission is observed along the arms. [5] At the end of the main spiral arm there is a smaller galaxy, lying 1.2 arcminutes from the nucleus of NGC 3445, [4] connected with a weak bridge. [6]

In the infrared are visible four bright locations of active star formation. The brightest of these infrared knots hosts five young massive star clusters, all being formed by a single giant molecular cloud. The age of the clusters was determined to be 3 to 5 million years and their mass to be around 105  M☉ . [7] Another large star cluster lies at the nucleus of the galaxy and could be in the process of forming a bulge. [5] The total star formation rate of the galaxy is estimated to be around 1 M☉ per year. [5] The star formation as well as the shape of the galaxy could be the result of interaction with other galaxies. [7]

Nearby galaxies

NGC 3445 forms a triplet with NGC 3440, which lies 9.9 arcminutes away, and NGC 3458, which lies 14 arcminutes away. [4] These galaxies comprise the LGG 226 group. [8] It belongs to the same galaxy cloud as NGC 3610. [9]

Related Research Articles

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<span class="mw-page-title-main">NGC 5982</span> Galaxy in the constellation Draco

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<span class="mw-page-title-main">NGC 6907</span> Galaxy in the constellation Capricornus

NGC 6907 is a spiral galaxy located in the constellation Capricornus. It is located at a distance of about 120 million light-years from Earth, which, given its apparent dimensions, means that NGC 6907 is about 115,000 light-years across. It was discovered by William Herschel on July 12, 1784. The total infrared luminosity of the galaxy is 1011.03 L☉, and thus it is categorised as a luminous infrared galaxy.

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

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<span class="mw-page-title-main">NGC 5363</span> Galaxy in the constellation Virgo

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<span class="mw-page-title-main">NGC 2964</span> Spiral galaxy in the constellation Leo

NGC 2964 is an intermediate spiral galaxy located in the constellation Leo. It is located at a distance of circa 60 million light years from Earth, which, given its apparent dimensions, means that NGC 2964 is about 60,000 light years across. It was discovered by William Herschel on December 7, 1785.

<span class="mw-page-title-main">NGC 3664</span> Galaxy in the constellation Leo

NGC 3664 is a magellanic barred spiral galaxy in the constellation of Leo. It is located about 80 million light years away from Earth, which means, given its apparent dimensions, that NGC 3664 is approximately 50,000 light years across. It was discovered by Wilhelm Tempel on March 14, 1879. It is a member of the NGC 3640 Group of galaxies, which is a member of the Leo II Groups, a series of galaxies and galaxy clusters strung out from the right edge of the Virgo Supercluster.

<span class="mw-page-title-main">NGC 7513</span> Galaxy in the constellation Sculptor

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<span class="mw-page-title-main">NGC 5953</span> Galaxy in the constellation Serpens

NGC 5953 is a peculiar spiral galaxy in the constellation Serpens. The galaxy lies about 80 million light years away from Earth, which means, given its apparent dimensions, that NGC 5953 is approximately 35,000 light years across. It was discovered by William Herschel on April 17, 1784. NGC 5953 interacts with NGC 5954 forming a pair known as Arp 91.

<span class="mw-page-title-main">NGC 3995</span> Galaxy in the constellation Ursa Major

NGC 3995 is a Magellanic spiral galaxy in the constellation Ursa Major. The galaxy lies about 100 million light years away from Earth based on the Tully–Fisher relation, which means, given its apparent dimensions, that NGC 3995 is approximately 80,000 light years across, while based on redshift it lies 170 million light years away. It was discovered by Heinrich d'Arrest on February 5, 1864.

<span class="mw-page-title-main">NGC 3994</span> Galaxy in the constellation Ursa Major

NGC 3994 is a spiral galaxy in the constellation Ursa Major. The galaxy lies about 160 million light years away from Earth, which means, given its apparent dimensions, that NGC 3994 is approximately 70,000 light years across. It was discovered by Heinrich d'Arrest on April 6, 1864.

References

  1. 1 2 3 4 5 6 7 8 "NASA/IPAC Extragalactic Database". Results for NGC 3445. Retrieved 2024-03-26.
  2. ↑ "Revised NGC Data for NGC 3445". spider.seds.org. Retrieved 30 March 2024.
  3. ↑ Seligman, Courtney. "NGC 3445 (= Arp 24)". Celestial Atlas. Retrieved 19 November 2018.
  4. 1 2 3 Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington
  5. 1 2 3 Das, M.; Sengupta, C.; Ramya, S.; Misra, K. (11 July 2012). "Star formation in bulgeless late-type galaxies: clues to their evolution: Star formation in bulgeless galaxies". Monthly Notices of the Royal Astronomical Society. 423 (4): 3274–3284. arXiv: 1205.1936 . doi:10.1111/j.1365-2966.2012.21120.x.
  6. ↑ Smith, Beverly J.; Struck, Curtis; Hancock, Mark; Appleton, Philip N.; Charmandaris, Vassilis; Reach, William T. (March 2007). "The Spitzer Spirals, Bridges, and Tails Interacting Galaxy Survey: Interaction-Induced Star Formation in the Mid-Infrared". The Astronomical Journal. 133 (3): 791–817. arXiv: astro-ph/0610562 . doi:10.1086/510350.
  7. 1 2 Cao, Chen; Wu, Hong (April 2007). "Multiwavelength Study of Young Massive Star Clusters in the Interacting Galaxy Arp 24". The Astronomical Journal. 133 (4): 1710–1721. doi:10.1086/512125.
  8. ↑ Garcia, A. M. (1 July 1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47–90. Bibcode:1993A&AS..100...47G. ISSN   0365-0138.
  9. ↑ 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 19 July 2017.
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