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NGC 1637 - Wikipedia

Coordinates:

04^h 41^m 28.229^s, −02° 51′ 28.94″

From Wikipedia, the free encyclopedia

NGC 1637
Very Large Telescope image of NGC 1637.
Observation data (J2000 epoch)
Constellation	Eridanus
Right ascension	04^h 41^m 28.229^s^[1]
Declination	−02° 51′ 28.94″^[1]
Redshift	0.00239^[2]
Heliocentric radial velocity	717.1±1.2 km/s^[2]
Distance	9.77 ± 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
Type	SAB(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]

Supernova

One supernova has been observed in NGC 1637. SN 1999em (type II-P, mag. 13.5) was discovered by the Lick Observatory Supernova Search (LOSS) on 29 October 1999, at an angular separation of 24″ to the southwest of the galaxy center.^[10]^[11] It was the brightest supernova discovered that year, reaching magnitude 13.1.^[12] The location corresponds to a deprojected galactocentric separation of 1.3 kpc (4.2 kly).^[3]

Image and Video Gallery

NGC 1637 imaged by the Hubble Space Telescope
Video showing the location of NGC 1637

References

^ ^a ^b Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.
^ ^a ^b Haynes, Martha P.; et al. (January 1998). "Asymmetry in High-Precision Global H i Profiles of Isolated Spiral Galaxies". The Astronomical Journal. 115 (1): 62–79. Bibcode:1998AJ....115...62H. doi:10.1086/300166. S2CID 123380349.
^ ^a ^b ^c ^d ^e Crowther, Paul A. (January 2013). "On the association between core-collapse supernovae and H ii regions". Monthly Notices of the Royal Astronomical Society. 428 (3): 1927–1943. arXiv:1210.1126. Bibcode:2013MNRAS.428.1927C. doi:10.1093/mnras/sts145.
^ "NASA/IPAC Extragalactic Database". Results for NGC 1512, Co-Moving Radial Distance. Retrieved 2014-12-18.
^ ^a ^b ^c ^d "NASA/IPAC Extragalactic Database". Results for NGC 1637. Retrieved 2006-11-25.
^ ^a ^b ^c ^d ^e ^f Immler, Stefan; et al. (October 2003). "A Deep Chandra X-Ray Observation of NGC 1637". The Astrophysical Journal. 595 (2): 727–742. Bibcode:2003ApJ...595..727I. doi:10.1086/377474.
^ ^a ^b ^c ^d ^e ^f Sohn, Young-Jong; Davidge, T. J. (January 1998). "VRI CCD Photometry of Supergiant Stars in the Barred Galaxies NGC 925 and NGC 1637". The Astronomical Journal. 115 (1): 130–143. Bibcode:1998AJ....115..130S. doi:10.1086/300163.
^ Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. Vol. 1. Sky Publishing Corporation and the European Space Agency. ISBN 0-933346-84-0.
^ Seligman, Courtney. "New General Catalogue Objects: NGC 1637". Celestial Atlas. Retrieved 30 November 2024.
^ Li, W. D. (1999). "Supernova 1999em in NGC 1637". International Astronomical Union Circular (7294): 1. Bibcode:1999IAUC.7294....1L.
^ "SN 1999em". Transient Name Server. IAU. Retrieved 30 November 2024.
^ Bishop, David. "Bright Supernovae - 1999 : SN 1999em". Astronomy Section, Rochdale Academy of Science. Retrieved 2024-11-30.

External links

Media related to NGC 1637 at Wikimedia Commons

v t e Astronomical catalogs
NGC	NGC 1632 NGC 1633 NGC 1634 NGC 1635 NGC 1636 NGC 1637 NGC 1638 NGC 1639 NGC 1640 NGC 1641 NGC 1642
PGC	PGC 15817 PGC 15818 PGC 15819 PGC 15820 PGC 15821 PGC 15822 PGC 15823 PGC 15824 PGC 15825

New General Catalogue 1500 to 1999

Constellation of Eridanus

Stars

Bayer	α (Achernar) β (Cursa) γ (Zaurak) δ (Rana) ε (Ran) ζ (Zibal) η (Azha) θ¹ (Acamar) θ² ι κ λ μ ν ξ ο¹ (Beid) ο² (40, Keid) π ρ¹ ρ² ρ³ τ¹ τ² (Angetenar) τ³ τ⁴ τ⁵ τ⁶ τ⁷ τ⁸ τ⁹ υ¹ υ² (Theemin) υ³ (Beemim) υ⁴ φ χ ψ ω
Flamsteed	14 15 17 (v) 39 (A) 45 51 (c) 53 (Sceptrum) 54 58 64 66
Variable	DO DZ EF EK EM (d) EP KT
HR	486 (p) 487 (p) 506 (q¹) 789 (s) 859 1008 (e) 1106 (y) 1143 (h) 1189 (f) 1190 (f) 1195 (g) 1483 1536 1614
HD	18742 (Ayeyarwady) 19467 28185 30562 30856 (Mouhoun) 30963
Other	2MASS J04151954−0935066 DENIS 0255−4700 Gliese 86 Gliese 180 GJ 1062 GJ 3293 GJ 3323 HIP 12961 (Koeia) LTT 1445 LP 890-9 Mothra WASP-22 (Tojil) WASP-35 WASP-50 (Chaophraya) WASP-78 WASP-79 (Montuno) WISE J0336−0143

Exoplanets	51 Eridani b ε Eridani b (AEgir) Gliese 86 b HD 10647 b HD 18742 b (Bagan) HD 28185 b HD 30562 b HD 30856 Ab (Nakanbé) WASP-79b (Pollera)

Nebulae

NGC	1535

Galaxies

NGC	782 852 939 1084 1132 1140 1172 1187 1189 1190 1191 1192 1199 1222 1232 1234 1241 1253 1262 1266 1269 1291 1300 1309 1325 1332 1337 1345 1347 1353 1357 1369 1386 1395 1400 1403 1404 1407 1426 1427A 1436 1437 1439 1452 1460 1487 1531 1532 1592 1600 1614 1637 1721 1723 1725 1728 1741
Other	Eridanus II ESO 198-13 ESO 0313-192 IC 1953 IC 2006 LEDA 74886 MRC 0406-244 PKS 0208-512 PKS 0405–385 PKS 0420-014 UGC 2812

Galaxy clusters	Abell 383 Eridanus Cluster Eridanus Group MACS J0416.1-2403

Astronomical events	GRB 080913 HE0435-1223

Supernova

Image and Video Gallery

See also

References

External links