MCG +08-11-011 (MCG +8-11-11) known as UGC 3374, is a galaxy located in the constellation of Auriga. It is located 401 million light years from Earth and is classified as a Seyfert galaxy.
Characteristics.
MCG +8-11-11 is classified a type 1 Seyfert galaxy. It is face-on spiral galaxy located at a projected distance of 123 megaparsecs. It has a soft X-ray luminosity originating from its nuclear core varying between 0.5 and 1 1044 erg s−1. It is also one of the brightest active galactic nuclei (AGN) observed in X-ray bands but radio-quiet. Through detected by most X-ray satellites, the galaxy wasn't one of the targets noticed by Chandra X-ray Observatory. It has an X-ray spectrum fitted by an estimated power law of Γ = 1.8 with an undetermined iron line likely originating from distant matter. The galaxy has soft gamma-ray emission at 3.9 σ level, higher than 90 keV.
Additionally, MCG +8-11-11 contains X-ray fluxes. Based on observations by the INTErnational Gamma-ray Astrophysics Observation (INTEGRAL), they have measurements of F20-100 keV = 8.46 x 10−11 erg cm−2 s−1 and F2-10 keV = 5.62 x 10−11 erg cm−2 s−1 respectively. Based from a spectral analysis conducted by NuSTAR, the galaxy has a bolometric luminosity estimated as Lbol = 14.2 x 1044 erg s−1. Furthermore, the black hole in MCG +8-11-11 has a mass of MBH = 7.19 ± 0.02 MΘ and an Eddington ratio of 7.54 x 10−1. The thermal emission from its accretion disk is hot with a temperature of kT = 0.088+0.018-0.007 keV.
Observations.
MCG +8-11-11 has been observed in many occasions. In July 1995, its powerful gamma-ray flux was detected during a High Energy Astronomical Telescope balloon flight, suggesting its hard X-ray spectral feature was caused by a double-Compton backscattering exerted on its external cloud. A Suzaku observation conducted in 2010 finds out the galaxy exhibits spectral signatures from its accretion disk.
In November 2014, data from the observation by the 118 ks Chandra High Energy Transmission Gratings found MCG +8-11-11 shows lack of warm absorption and its Compton reflection signatures are described by out of direction material from the naked eye, based on an inclination angle of θ = 41+18−30 obtained by a MYTorus model. Between 2019 and 2020, it was determined that MCG +8-11-11 has a host-corrected AGN luminosity of 5100 Ά of (4.21 ± 0.65) x 1043 erg s−1 and a large disk-size according to a photometric reverberation mapping conducted by the Wise Observatory.
Radio source.
MCG +8-11-11 hosts a triple radio source in its center with a projected size of 400 parsecs and an S-shaped morphology. However the central compartment of the source has a small diameter of 30 parsecs and is possibly confirmed as the active galaxy's core. The source is also found embedded in diffused emission with a major-axis position angle similar to its bar but offset by 50 degrees.