NGC 5665

NGC 5665
Hubble Space Telescope view of NGC 5665
Observation data (J2000 epoch)
Constellation	Boötes
Right ascension	14h 32m 25.796s[1]
Declination	+08° 04′ 42.43″[1]
Redshift	0.007431±0.000017[2]
Heliocentric radial velocity	2,237 km/s[3]
Distance	53.6 ± 7.7 Mly (16.44 ± 2.37 Mpc)[3]
Apparent magnitude (V)	12.7[4]
Apparent magnitude (B)	12.50[5]
Characteristics
Type	SAB(rs)c pec?[6]
Mass	6×1010[5] M☉
Apparent size (V)	1.653′ × 1.257′[1]
Other designations
GC 3923, IRAS F14299+0818, 2MASX J14322579+0804424, NGC 5665, UGC 9352, LEDA 51953, MCG +01-37-024, PGC 51953, CGCG 047.084, VV 412[7]

NGC 5665 is a spiral galaxy in the northern constellation of Boötes. It was discovered on January 30, 1784 by German-British astronomer William Herschel.^[8] This galaxy is located at a distance of 53.6 ± 7.7 million light-years (16.44 ± 2.37 Mpc),^[3] and is receding with a heliocentric radial velocity of 2,237 km/s.^[3] It is cataloged in Halton Arp's Atlas of Peculiar Galaxies as object number 49.^[5]

The morphological classification of NGC 5665 is unclear and differs by author.^[5] In the De Vaucouleurs system it was classified as SAB(rs)c pec?,^[6] which indicates a weakly-barred spiral galaxy (SAB) with a transitional inner ring structure (rs), loosely wound spiral arms (c), and suspected peculiarities (pec?). The galactic plane is inclined at an angle of 53°±5° to the plane of the sky,^[3] with the major axis aligned along a position angle of 145°.^[5]

Evidence suggests that NGC 5665 underwent a gravitational interaction with another galaxy some 500 million years ago, swallowing a smaller companion.^[5] It is somewhat asymmetrical in appearance,^[6] retaining a single main spiral arm and the remains of several others. The galaxy is rich in dust and gas with a small bar at the center. There are numerous sites of star formation in the arm that match the age of the interaction.^[5] The spectrum of the core is a blend between a LINER and an H II region.^[6]

References

External links

• Media related to NGC 5665 at Wikimedia Commons
• Image NGC 5665
• Distance Archived 2011-06-07 at the Wayback Machine
• SIMBAD Data