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NGC 1637

NGC 1637
Very Large Telescope image of NGC 1637.
Observation data (J2000 epoch)
ConstellationEridanus
Right ascension04h 41m 28.229s[1]
Declination−02° 51′ 28.94″[1]
Redshift0.00239[2]
Heliocentric radial velocity717.1±1.2 km/s[2]
Distance9.77 ± 1.82 Mpc (31.9 ± 5.9 Mly)[3]
9.18 Mpc (29.9 Mly) h−1
0.73[4]
Apparent magnitude (V)11.5[5]
Apparent magnitude (B)11.25[6]
Characteristics
TypeSAB(rs)c[3] or SBc(s)II.3[7]
Size~57,000 ly (17.48 kpc) (estimated)[5]
Apparent size (V)4.0′ × 3.2′[5]
Other designations
AGC 440323, IRAS 04389-0257, UGCA 93, MCG +00-12-068, PGC 15821, CGCG 393-066[5]

NGC 1637 is an isolated, non-interacting[7] intermediate spiral galaxy in the constellation Eridanus, about a degree to the WNW of the star Mu Eridani.[8] It was discovered by German-British astronomer William Herschel on 1 February 1786.[9] It is located at a distance of about 9.77 ± 1.82 Mpc (31.9 ± 5.9 Mly) from the Milky Way.[3] The galaxy is inclined at an angle of 31.1° to the line of sight from the Earth and the long axis is oriented along a position angle of 16.3°.[3]

In 1991, Gérard de Vaucouleurs and associates assigned a morphological classification of SAB(rs)c to NGC 1637, indicating a spiral galaxy with a weak bar structure (SAB) across the nucleus, surrounded by a partial ring (rs) and somewhat loosely-wound arms (c).[7] While the inner section of the galaxy shows a symmetrical two-arm structure,[6] it has a single outer spiral arm that wraps 180° around the nucleus,[6] giving the galaxy an overall asymmetric, lopsided appearance.[7] The outer spiral arm has a red component that indicates a significant age.[6] However, the existence of this structure is difficult to explain.[7] The galaxy shows indications of recent starburst activity that may have terminated around 15 million years ago.[6]

The active central nucleus shows weak LINER behavior, and it may be an intermediate form between a LINER and an H II region.[7] The luminosity of the X-ray source at the nucleus is 1.2×1038 ergs s−1 in the 0.3–7 keV band.[6]

  1. ^ a b Cite error: The named reference Skrutskie2006 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Haynes1998 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Crowther2013 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference ned-distance was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference ned was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference Immler2003 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Sohn1998 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Sinnott1997 was invoked but never defined (see the help page).
  9. ^ Seligman, Courtney. "New General Catalogue Objects: NGC 1637". Celestial Atlas. Retrieved 30 November 2024.
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