define Seyfert galaxy - Search
  1. Wikipedia
    https://en.wikipedia.org/wiki/Seyfert_galaxy
    Seyfert galaxy - Wikipedia
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  2. Dictionary

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    Sey·fert gal·ax·y
    [ˌsēfərt ˈɡaləksē, ˌsīfərt ˈɡaləksē]
    noun
    astronomy
    Seyfert galaxy (noun) · Seyfert galaxies (plural noun)
    1. a galaxy of a type characterized by a bright compact core that shows strong infrared emission.
    Origin
    named after Carl K. Seyfert (1911–60), American astronomer.
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  3. People also ask
    What is a Seyfert galaxy?Seyfert galaxy, any of a class of galaxies known to have active nuclei. Such galaxies were named for the American astronomer Carl K. Seyfert, who first called attention to them in 1944. Two types are recognized.

    Seyfert galaxy | Active Nucleus, Supermassive Black Hole & Quasar

    britannica.com
    Why are Seyfert galaxies distinctive?Often galaxies with these kinds of active galactic nuclei are so bright that the host galaxy itself cannot be seen, washed out by the glow of its nuclei, but Seyfert galaxies are distinctive because the galaxy itself is also visible.

    Hubble Spies a Spinning Spiral - Science@NASA

    science.nasa.gov
    When was a Seyfert Galaxie discovered?The first galaxies of this type were described in 1943 by C. K. Seyfert. Nearly all known Seyfert galaxies are spirals or barred spirals, and Seyfert-type activity probably occurs in a small percentage of all spiral galaxies. Seyfert galaxies are classified according to the relative widths of the emission lines in their spectra.

    Seyfert galaxy - Oxford Reference

    oxfordreference.com
    Are Seyfert galaxies quasars?Seyfert galaxies are lower-luminosity active galactic nuclei, with M > -21.51 + 5 log h0 for the active nucleus the generally accepted criterion, due originally to Schmidt & Green (1983), for distinguishing Seyfert galaxies from quasars. A Seyfert galaxy has a quasar-like nucleus, but the host galaxy is clearly detectable.

    Seyfert Galaxies - California Institute of Technology

    ned.ipac.caltech.edu
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  4. Britannica
    https://www.britannica.com/science/Se…

    Seyfert galaxy | Active Nucleus, Supermassive Black …

    WebSeyfert galaxy, any of a class of galaxies known to have active nuclei. Such galaxies were named for the American astronomer Carl K. Seyfert, who first called attention to them in 1944. Two types are recognized. The …

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    Seyfert Galaxies - an overview | ScienceDirect Topics
    sciencedirect.com
    A Catalog of Narrow Line Seyfert 1 Galaxies from the Sloan …
    iopscience.iop.org
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  5. sentinelmission.org
    https://sentinelmission.org/astrophysics-glossary/seyfert-galaxies

    Seyfert Galaxies - Definition & Detailed Explanation

  6. NASA
    https://www.nasa.gov/universe/galaxies/seyfert-galaxies

    Seyfert Galaxies - NASA

  7. sentinelmission.org
    https://sentinelmission.org/.../seyfert-galaxy

    Seyfert Galaxy - Definition & Detailed Explanation - Astronomical ...

  9. NASA/IPAC Extragalactic Database
    https://ned.ipac.caltech.edu/level5/March01/Weedman/Weed2.html

    Seyfert Galaxies - D. W. Weedman

  10. NASA/IPAC Extragalactic Database
    https://ned.ipac.caltech.edu/level5/Glossary/Essay_seyfert.html

    Seyfert Galaxies - California Institute of Technology

  11. Center for Astrophysics
    https://www.cfa.harvard.edu/news/seyfert-galaxies

    Seyfert Galaxies | Center for Astrophysics | Harvard & Smithsonian

  12. Merriam Webster
    https://www.merriam-webster.com/dictionary/Seyfert galaxy

    Seyfert galaxy Definition & Meaning - Merriam-Webster

  13. Oxford Reference
    https://www.oxfordreference.com/view/10.1093/oi/...

    Seyfert galaxy - Oxford Reference

  14. OpenLearn
    https://www.open.edu/openlearn/scien…

    3.2 Seyfert galaxies - OpenLearn

    WebSeyfert galaxies are spiral galaxies with unusually bright point-like nuclei that vary in brightness at different wavelengths. They are classified into two types based on the widths of their emission lines, …

  15. All About Space Magazine
    https://www.spaceanswers.com/deep-space/what-is-a-seyfert-galaxy

    What is a Seyfert galaxy? - All About Space

  16. Astronomy Stack Exchange
    https://astronomy.stackexchange.com/questions/11690

    What is a Seyfert galaxy? - Astronomy Stack Exchange

  17. SciTechDaily
    https://scitechdaily.com/seyferts-symphony-hubble...

    Seyfert’s Symphony: Hubble Showcases a Breathtaking

  18. ScienceDirect
    https://www.sciencedirect.com/.../seyfert-galaxies

    Seyfert Galaxies - an overview | ScienceDirect Topics

  19. Science Mission Directorate
    https://science.nasa.gov/missions/hubble/hubble...

    Hubble Views an Intriguing Active Galaxy - NASA Science

  20. Science Mission Directorate
    https://science.nasa.gov/missions/hubble/hubble...

    Hubble Captures a Peculiar Pair - NASA Science

  21. Springer
    https://link.springer.com/article/10.1007/s10509-017-3210-0

    Morphology of Seyfert galaxies | Astrophysics and Space Science …

  22. Guide to the Universe
    https://www.guide-to-the-universe.com/seyfert-galaxies.html

    Seyfert Galaxies - one type of active galaxy - Guide to the Universe

  23. Science Mission Directorate
    https://science.nasa.gov/missions/hubble/hubble...

    Hubble Spies a Spinning Spiral - NASA Science

  24. Dictionary
    https://www.dictionary.com/browse/seyfert-galaxy

    SEYFERT GALAXY Definition & Meaning | Dictionary.com

  25. Science Mission Directorate
    https://science.nasa.gov/universe/galaxies/types

    Types - NASA Science

  26. Science Mission Directorate
    https://science.nasa.gov/category/universe/galaxies/seyfert-galaxies

    Seyfert Galaxies Archives - NASA Science

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