NGC 3393 is a barred spiral galaxy located in the constellation Hydra. It is located at a distance of circa 180 million light-years from Earth, which, given its apparent dimensions, means that NGC 3393 is about 140,000 light-years across.

2011年8月31日 · At a distance of 160 million light years, NGC 3393 contains the nearest known pair of supermassive black holes. It is also the first time a pair of black holes has been found in a spiral galaxy like our Milky Way.

At a distance of 160 million light years, NGC 3393 contains the nearest known pair of supermassive black holes. It is also the first time a pair of black holes has been found in a spiral galaxy like our Milky Way.

2011年8月31日 · Here we report the presence of two active massive black holes, separated by about 490 light years, in the Seyfert11 galaxy NGC 3393 (50 Mpc, about 160 million light years).

NGC 3393是位于长蛇座的一个星系。 它的赤经为 1048.3，赤纬为 -25° 10′。

The black holes are located near the center of the spiral galaxy NGC 3393. Separated by only 490 light years, the black holes are likely the remnant of a merger of two galaxies of unequal mass a billion or more years ago. These images of NGC 3393 show X-rays from Chandra and optical data from the Hubble Space Telescope.

2011年9月5日 · Astronomers believe these two sources are the result of a small galaxy falling into a larger one, a so-called "minor merger". At a distance of "only" 160 million light years, NGC 3393 is the closest example of a double-super-blackhole system that we have identified so far. Published: September 5, 2011

Designated NGC 3393, the bright core makes this galaxy a Seyfert and the infrared glow of central dust help distinguish it as "type 2." Seyfert galaxies have extremely energetic nuclei similar to more powerful quasars. Seyferts are thought to have black holes in their centers.

2015年7月9日 · We present new Nuclear Spectroscopic Telescope Array (NuSTAR) and Chandra observations of NGC 3393, a galaxy reported to host the smallest separation dual active galactic nuclei (AGN) resolved in the X-rays.

Abstract: The discovery (Fabbiano et al. 2001) of two active black holes in the Seyfert galaxy NGC 3393, which are separated by about 490 light years, has revealed a merging event. This has led us to look for other evidence of galaxy collision and merging, using an analysis of the observed spectra in different frequency ranges.