NGC 7507

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]

ConstellationSculptor

Right ascension23^h 12^m 07.595^s[1]

Declination−28° 32′ 22.70″^[1]

Redshift0.005260±0.000100^[2]

Quick facts Observation data (J2000 epoch), Constellation ...

NGC 7507
NGC 7507 (2MASS)
Observation data (J2000 epoch)
Constellation	Sculptor
Right ascension	23h 12m 07.595s[1]
Declination	−28° 32′ 22.70″[1]
Redshift	0.005260±0.000100[2]
Heliocentric radial velocity	1,590±21 km/s[3]
Distance	80.07 ± 0.46 Mly (24.55 ± 0.14 Mpc)[4]
Apparent magnitude (V)	10.6[5]
Apparent magnitude (B)	11.60[6]
Characteristics
Type	E0[7]
Mass	2×1011[8] M☉
Size	91 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]

Close

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]