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    • Type 1 and Type 2

      • Seyfert Galaxies are classified into two main types: Type 1 and Type 2. Type 1 Seyfert Galaxies have broad emission lines in their spectra, indicating that the gas in the galaxy is moving at high velocities. These galaxies also have a relatively unobscured view of the central black hole and accretion disk.

      Seyfert Galaxies – Definition & Detailed Explanation ...

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  3. en.wikipedia.org › wiki › Seyfert_galaxySeyfert galaxy - Wikipedia

    In some cases, the spectra show both broad and narrow permitted lines, which is why they are classified as an intermediate type between Type I and Type II, such as Type 1.5 Seyfert. The spectra of some of these galaxies have changed from Type 1.5 to Type II in a matter of a few years.

  4. www.britannica.com › science › Seyfert-galaxySeyfert galaxy | Active Nucleus, Supermassive Black Hole ...

    Two types are recognized. The nuclear spectra of Type 1 Seyfert galaxies show broad emission lines, which are indicative of a central concentration of hot gas that is expanding at speeds of up to thousands of kilometres per second.

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  6. sentinelmission.org › seyfert-galaxiesSeyfert Galaxies – Definition & Detailed Explanation ...

    Apr 1, 2024 · Seyfert Galaxies are classified into two main types: Type 1 and Type 2. Type 1 Seyfert Galaxies have broad emission lines in their spectra, indicating that the gas in the galaxy is moving at high velocities.

  7. www.open.edu › content-section-3Introduction to active galaxies: 3.2 Seyfert galaxies ...

    Types 1 and 2 are better understood as extreme ends of a range of intermediate Seyfert types classified according to the relative strengths of their broad and narrow lines.

  8. ned.ipac.caltech.edu › Glossary › Essay_seyfertSeyfert Galaxies - California Institute of Technology

    Type 2 Seyfert galaxies differ from Seyfert 1 galaxies in that only the narrow lines are present in type 2 spectra. Samples of both a Seyfert 1 optical spectrum and a Seyfert 2 spectrum are shown below.

  9. www.nature.com › articles › nphys2951The different neighbours around Type-1 and Type-2 active ...

    May 11, 2014 · However, the vast majority of AGN in spiral hosts are radio-quiet and are at these luminosities classified as Seyfert galaxies.

  10. csep10.phys.utk.edu › OJTA2dev › ojtaSeyfert Galaxies - University of Tennessee

    The thousand or so Seyfert galaxies that are now known can be subclassified into two groups, Seyfert 1 galaxies and Seyfert 2 galaxies (these are also termed type 1 and type 2 Seyferts, respectively). These classifications have the following characteristics.