NGC 2403

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NGC 2403
NGC2403-Subaru-HST-L.jpg
A Hubble Space Telescope (HST), and Subaru image of NGC 2403. NGC 2404 is visible
Observation data (J2000 epoch)
Constellation Camelopardalis
Right ascension 07h 36m 51.4s [1]
Declination +65° 36′ 09″ [1]
Redshift 131 ± 3 km/s [1]
Distance 9.65 Mly (2.96 Mpc) [2]
Apparent magnitude  (V)8.9 [1]
Characteristics
Type SAB(s)cd [1]
Apparent size  (V)21.9′ × 12.3′ [1]
Other designations
UGC 3918, [1] PGC 21396, [1] Caldwell 7

NGC 2403 (also known as Caldwell 7) is an intermediate spiral galaxy in the constellation Camelopardalis. It is an outlying member of the M81 Group, [3] and is approximately 8 million light-years distant. It bears a similarity to M33, being about 50,000 light years in diameter and containing numerous star-forming H II regions. [4] The northern spiral arm connects it to the star forming region NGC 2404. [3] NGC 2403 can be observed using 10×50 binoculars. [3] NGC 2404 is 940 light-years in diameter, making it one of the largest known H II regions. This H II region represents striking similarity with NGC 604 in M33, both in size and location in galaxy.

Contents

Supernova and Supernova Imposters

There have been four reported astronomical transients in the galaxy:

History

The galaxy was discovered by William Herschel in 1788. Edwin Hubble detected Cepheid variables in NGC 2403 using the Hale Telescope, making it the first galaxy beyond the Local Group within which a Cepheid was discovered. [3] By 1963, 59 variables had been found in NGC 2403, of which 17 were eventually confirmed as Cepheids, with periods between 20 and 87 days. As late as 1950 Hubble was using a distance of just under 2 million light years for the galaxy's distance, but by 1968 the analysis of the Cepheids increased this by almost a factor of five, to within 0.2 magnitudes of the current value.

Companions

NGC 2403 has two known companions. One is the relatively massive dwarf galaxy DDO 44. It is currently being disrupted by NGC 2403, as evidenced by a tidal stream extending 82  kly (25  kpc ) on both sides of DDO 44. DDO 44 is approaching NGC 2403 at a distance much closer than typical for dwarf galaxy interactions. It currently has a V-band absolute magnitude of −12.9, but its progenitor was even more luminous. [2]

The other known companion is officially named MADCASH J074238+652501-dw, although it is nicknamed MADCASH-1. The name refers to the MADCASH (Magellanic Analog Dwarf Companions and Stellar Halos) project. MADCASH-1 is similar to typical dwarf spheroidal galaxies in the Local Group; it is quite faint, with an absolute V-band magnitude of −7.81, and has only an ancient, metal-poor population of red giant stars. [11]

Luminous blue variables in NGC 2403

NGC 2403 has four known luminous blue variables. AT 2016ccd, NGC 2403 V14, NGC 2403 V37, and NGC 2403 V12.

Not much is known about AT 2016ccd, besides that it is a luminous blue variable. AT 2016ccd has a magnitude of 18-19.95, so it is quite dim. NGC 2403 V14 is more well known then AT 2016ccd. NGC 2403 V14 has a size of 1,260.2 solar radii, it has a mass of 24 solar masses and has a temperature of 7,041 K. NGC 2403 V14 has a magnitude of 12.9. NGC 2403 V37 is not well known, it is believed to be a luminous blue variable with a magnitude of 12.9. NGC 2403 V12 is an unknown luminous blue variable with a magnitude of 6.5. [] [] [] []


A Galaxy of Birth and Death A Galaxy of Birth and Death.jpg
A Galaxy of Birth and Death

See also

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<span class="mw-page-title-main">NGC 2748</span> Galaxy in the constellation Camelopardalis

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<span class="mw-page-title-main">NGC 3198</span> Galaxy in the constellation Ursa Major

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<span class="mw-page-title-main">NGC 3021</span> Galaxy in the constellation Leo Minor

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<span class="mw-page-title-main">NGC 4242</span> Galaxy in constellation Canes Venatici

NGC 4242 is a spiral galaxy in the northern constellation of Canes Venatici. The galaxy is about 18 million light years away. It was discovered on 10 April 1788 by William Herschel, and it was described as "very faint, considerably large, irregular, round, very gradually brighter in the middle, resolvable" by John Louis Emil Dreyer, the compiler of the New General Catalogue.

<span class="mw-page-title-main">NGC 877</span> Galaxy located in the constellation Aries

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<span class="mw-page-title-main">NGC 2404</span> Large, emission nebula in the constellation Camelopardalis

NGC 2404 is a massive H II region inside NGC 2403, a spiral galaxy in Camelopardalis. It was discovered on February 2, 1886 by Gulliaume Bigourdan. NGC 2404 is approximately 940 ly in diameter, making it one of the largest H II regions so far known. It is the largest H II region in NGC 2403, and lies at the outskirts of the galaxy, making for a striking similarity with NGC 604 in M33, both in size and location in the host galaxy. This H II region contains 30-40 Wolf-Rayet stars, and unlike the Tarantula Nebula, but similar to NGC 604, NGC 2404's open cluster is probably much less compact, so it probably looks like a large stellar association. This H II region is probably only a few million years old.

<span class="mw-page-title-main">DDO 44</span> Dwarf spheroidal galaxy in the constellation Camelopardalis

DDO 44 is a dwarf spheroidal galaxy in the M81 Group, believed to be a satellite galaxy of the nearby NGC 2403.

References

  1. 1 2 3 4 5 6 7 8 "NASA/IPAC Extragalactic Database". Results for NGC 2403. Retrieved 2006-11-21.
  2. 1 2 Carlin, Jeffrey L.; Garling, Christopher T.; Peter, Annika H. G.; Crnojević, Denija; Forbes, Duncan A.; Hargis, Jonathan R.; Mutlu-Pakdil, Burçin; Pucha, Ragadeepika; Romanowsky, Aaron J.; Sand, David J.; Spekkens, Kristine; Strader, Jay; Willman, Beth (2019). "Tidal Destruction in a Low-mass Galaxy Environment: The Discovery of Tidal Tails around DDO 44". The Astrophysical Journal. 886 (2): 109. arXiv: 1906.08260 . Bibcode:2019ApJ...886..109C. doi: 10.3847/1538-4357/ab4c32 . S2CID   195218404.
  3. 1 2 3 4 Kepple, George Robert; Glen W. Sanner (1998). The Night Sky Observer's Guide. Vol. 1. Willmann-Bell, Inc. p. 73. ISBN   978-0-943396-58-3.
  4. ↑ Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. (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.
  5. ↑ Van Dyk, Schuyler D.; Filippenko, Alexei V.; Chornock, Ryan; Li, Weidong; Challis, Peter M. (2005). "Supernova 1954J (Variable 12) in NGC 2403 Unmasked". Publications of the Astronomical Society of the Pacific. 117 (832): 553–562. arXiv: astro-ph/0503324 . Bibcode:2005PASP..117..553V. doi:10.1086/430238.
  6. ↑ Green, Daniel W. E. (January 15, 2003). "Central Bureau for Astronomical Telegrams, Circular No. 8051" . Retrieved 14 August 2024.
  7. ↑ "SN 2002kg". Transient Name Server. IAU . Retrieved 14 August 2024.
  8. ↑ "SN 2004dj". Transient Name Server. IAU . Retrieved 14 August 2024.
  9. ↑ Bishop, David (9 November 2021). "LBV AT2016ccd in NGC 2403". Rochester Astronomy. Retrieved 31 August 2024.
  10. ↑ "AT 2016ccd". Transient Name Server. IAU . Retrieved 31 August 2024.
  11. ↑ Carlin, Jeffrey L.; Mutlu-Pakdil, Burçin; Crnojević, Denija; Garling, Christopher T.; Karunakaran, Ananthan; Peter, Annika H. G.; Tollerud, Erik; Forbes, Duncan A.; Hargis, Jonathan R.; Lim, Sungsoon; Romanowsky, Aaron J.; Sand, David J.; Spekkens, Kristine; Strader, Jay (2021). "Hubble Space Telescope Observations of Two Faint Dwarf Satellites of Nearby LMC Analogs from MADCASH". The Astrophysical Journal. 909 (2): 211. arXiv: 2012.09174 . Bibcode:2021ApJ...909..211C. doi: 10.3847/1538-4357/abe040 . S2CID   229297953.
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