NGC 7507

NGC 7507
NGC 7507 (2MASS)
Observation data (J2000 epoch)
ConstellationSculptor
Right ascension23h 12m 07.595s[1]
Declination−28° 32′ 22.70″[1]
Redshift0.005260±0.000100[2]
Heliocentric radial velocity1,590±21 km/s[3]
Distance80.07 ± 0.46 Mly (24.55 ± 0.14 Mpc)[4]
Apparent magnitude (V)10.6[5]
Apparent magnitude (B)11.60[6]
Characteristics
TypeE0[7]
Mass2×1011[8] M☉
Size91 kly[5]
Apparent size (V)1.987′ × 1.907′[1] (NIR)
Other designations
NGC 7507, LEDA 70676, MCG -05-54-022; ESO 469-19, AM 2309-284[9]

NGC 7507 is an elliptical galaxy located in the constellation Sculptor. It was discovered by the German-British astronomer William Herschel on October 30, 1783.[10] The galaxy lies at an estimated distance of 80.1 million light-years (24.55 Mpc) from the Milky Way,[4] and has an angular size of 2.0′ × 1.9′ in the near infrared.[1] It is receding with a heliocentric radial velocity of 1,590 km/s.[3]

The morphological classification of NGC 7507 is E0, indicating an elliptical galaxy with an almost perfectly circular profile. This massive galaxy is fairly isolated, although it forms a pair with the barred spiral galaxy NGC 7513.[8] The latter lies at a projected angular separation of 18′.[11] Apart from a central dust lane, NGC 7507 displays neither shells nor tidal features.[11] The stellar halo has two components, with the outer and inner halos counter-rotating.[12]

It is unusual galaxy in that it displays a negligible dark matter profile, showing a constant mass to light ratio.[8] This apparent lack of a dark matter component is difficult to explain in an LCDM cosmology.[12] The globular cluster population around NGC 7507 is very small, being only a tenth the size of other comparable ellipticals. It more closely resembles the globular population of a spiral galaxy.[11]

  1. ^ a b c d Cite error: The named reference Skrutskie_et_al_2006 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Paturel_et_al_2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Ogando_et_al_2008 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Tully_et_al_2013 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Simpson_2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Lauberts_Valentijn_1989 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference ned was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Salinas_et_al_2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference cseligman was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Caso_et_al_2013 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Lane_et_al_2015 was invoked but never defined (see the help page).