OGC 139

OGC 139 also known as 2MASX J16394598+4609058 is a massive spiral galaxy located in the constellation of Hercules. The redshift of the galaxy is (z) 0.247 and it is classified as a super spiral galaxy; a type of massive disk galaxy considered to be star-forming.

Description

OGC 139 is categorized as an edge-on spiral galaxy. The isophotal diameter of the galaxy is estimated to be 134 kiloparsecs and it has an apparent luminosity of L_r = 12.0. The bulge fraction ratio is calculated to be B/T = 0.13, with the galactic disk having an inclination of 76° and orientated at the position angle of 28°. The scale of the disk is 3.88 kiloparsecs, with the disk exponential scale of R_d = 32.98.

The total star formation rate of OGC 139 is 1.65 per year based on the calculation of the 12 micrometer band by Wide-field Infrared Survey Explorer (WISE). The mass of the stars is calculated to be 11.74 based on a W1-band luminosity with the gas mass of 10.9 based on the total star formation rate.

A study published in 2021 found the inclination of the galaxy is 76° based on the z-band axial ratio with the major axis position angle found to be 115°. The maximum deprojected speed of the galaxy is found to be v_max = 483 kilometers per seconds at 90 kiloparsecs based on both standard deviation and the hydrogen-alpha rotation curve measurements.