NGC 5665

NGC 5665
Hubble Space Telescope view of NGC 5665
Observation data (J2000 epoch)
ConstellationBoötes
Right ascension14h 32m 25.796s[1]
Declination+08° 04′ 42.43″[1]
Redshift0.007431±0.000017[2]
Heliocentric radial velocity2,237 km/s[3]
Distance53.6 ± 7.7 Mly (16.44 ± 2.37 Mpc)[3]
Apparent magnitude (V)12.7[4]
Apparent magnitude (B)12.50[5]
Characteristics
TypeSAB(rs)c pec?[6]
Mass6×1010[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]

SDSS image of NGC 5665

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]

  1. ^ a b c Cite error: The named reference ApJ131_1163 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference apj419_30 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Kourkchi_et_al_2020 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference NED was invoked but never defined (see the help page).
  5. ^ a b c d e f g Cite error: The named reference Artamonov_et_al_2000 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Thomas_et_al_2002 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference CSeligman was invoked but never defined (see the help page).