NGC 7585

Last updated
NGC 7585
NGC7585-HST-R814GB555.jpg
Hubble Space Telescope (HST) image of the galaxy
Observation data (J2000 epoch)
Constellation Aquarius
Right ascension 23h 18m 01.3s [1]
Declination −04° 39′ 01″ [1]
Redshift 0.011805 ± 0.000003
Helio radial velocity 3539 ± 1 km/s [1]
Distance 145 million light years
Apparent magnitude  (V)11.4 [2]
Characteristics
Type (R')SA(s)0+ pec [1]
Apparent size  (V)2.3′ × 2.0′ [1]
Other designations
MCG -01-59-015, PGC 70986, [1] Arp 223 [1]

NGC 7585 is a lenticular galaxy with a peculiar shape resulting from an interaction between two galaxies. It is located 145 million light years away in the constellation Aquarius which, given its apparent dimensions, means that NGC 7585 is about 100,000 light years across. It was discovered by William Herschel on September 20, 1784. [3]

Contents

Characteristics

NGC 7585 is a lenticular galaxy with shells. The disk of the galaxy is also present and distinct from the shells. The shells are irregular and have radial and loop form, and one of them looks like a faint outer arm. The shells are probably the result of a merger that took place over a billion years ago. The shells are bluer than the rest of the galaxy and suggestive of a spiral galaxy taking part in a merger, while other features seem to be part of the accreted galaxy. [4] The upper limit of the molecular gas mass based on CO imaging is 107.5 M☉. [5]

Nearby galaxies

Two galaxies appear near NGC 7585. NGC 7576 is located 10.7 arcminutes southwest of NGC 7585, while NGC 7592 is located 15.2 arcminutes to the northeast. NGC 7576 is at a similar redshift with NGC 7585, but its normal shape indicates it has not interacted recently with NGC 7585. On the other hand, NGC 7592 appears disturbed, however it has double the redshift. [4]

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NGC 2293 is a lenticular galaxy located in the constellation Canis Major. It is located at a distance of circa 100 million light years from Earth, which, given its apparent dimensions, means that NGC 2293 is about 160,000 light years across. It was discovered by John Herschel on January 20, 1835. NGC 2293 forms a pair with NGC 2292 and has an HI ring that surrounds both galaxies.

<span class="mw-page-title-main">NGC 7592</span> Interacting galaxy system in the constellation Aquarius

NGC 7592 is an interacting galaxy system located 300 million light years away in the constellation Aquarius. It was discovered by William Herschel on September 20, 1784. The total infrared luminosity is 1011.33 L☉, and thus it is categorised as a luminous infrared galaxy. One of the galaxies hosts a type 2 Seyfert nucleus.

References

  1. 1 2 3 4 5 6 7 "NASA/IPAC Extragalactic Database". Results for NGC 7585. Retrieved 2020-11-03.
  2. ↑ "Revised NGC Data for NGC 7585". spider.seds.org. Retrieved 25 November 2018.
  3. ↑ Seligman, Courtney. "NGC 7585 (= PGC 70986)". Celestial Atlas. Retrieved 19 November 2018.
  4. 1 2 McGaugh, Stacy S.; Bothun, Gregory D. (October 1990). "Stellar populations in shell galaxies". The Astronomical Journal. 100: 1073. Bibcode:1990AJ....100.1073M. doi:10.1086/115580. hdl: 1903/8712 .
  5. ↑ Ueda, Junko; Iono, Daisuke; Yun, Min S.; Crocker, Alison F.; Narayanan, Desika; Komugi, Shinya; Espada, Daniel; Hatsukade, Bunyo; Kaneko, Hiroyuki; Matsuda, Yuichi; Tamura, Yoichi; Wilner, David J.; Kawabe, Ryohei; Pan, Hsi-An (12 August 2014). "Cold molecular gas in merger remnants. I. Formation of molecular gas disks". The Astrophysical Journal Supplement Series. 214 (1): 1. arXiv: 1407.6873 . Bibcode:2014ApJS..214....1U. doi:10.1088/0067-0049/214/1/1. S2CID   716993.
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