Markarian 382

Markarian 382 has been specifically categorized as a narrow-line Seyfert galaxy.^[4] It is known to be X-ray variable with two flux states shown on high and low levels. When it underwent a high flux state, its optical spectrum has a soft appearance, which is mainly characterized by a low fractional variability state displayed in X-ray bands. When reaching a low flux state, the spectrum is the opposite.^[5]

The host galaxy of Markarian 382 is a barred spiral galaxy of type SBa based on imaging made with Hubble Space Telescope (HST), modeled by a single bulge and disk showing presence of spiral arms.^[6][7] When imaged, it is found to display a bar surrounded by a ring feature, with its spiral structure forming a pseudo-ring on its outer side.^[8] There is also a presence of a dust lane found to be curved and located northwest from the central bright nucleus, and also along the edge of a stellar bar.^[9]

The central supermassive black hole of Markarian 382 is estimated to be 0.90 ± 0.12 × 10⁷ M_☉.^[10] A study published in December 2022, has estimated the black hole as 6.50^+0.19_-0.29 M_☉ instead with an Eddington luminosity of 0.81 L_Edd. When observed in energy band, the X-ray spectrum contains two warm absorbing components with turbulent velocities of 100 and 100 kilometers per seconds.^[11]

An absorption system is found around Markarian 382. When observed, it is found to be made up of at least four velocity components. Upon further observations, there are two H I components classified as weak with measured column densities of around 10^12.8 and 10^13.3 cm⁻² and blueshifted velocities of -62 and -228 kilometer per seconds. Doubly ionized silicon absorption has also been detected in additional.^[12]

• Markarian 382 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
• Markarian 382 on SIMBAD