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Hemisphere:  Southern  ·  Contains:  NGC 4945

Image of the day 11/28/2020

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    NGC4945, 



    
        

            tommy_nawratil
    NGC4945
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    NGC4945

    Technical card

    Imaging telescopes or lenses: Faried 10"f4

    Imaging cameras: ZWO ASI1600MM-Cool

    Guiding telescopes or lenses: Skywatcher 9x50 finder

    Guiding cameras: Lacerta MGEN

    Software: Pleiades Astrophoto, S.L. Pix Insight  ·  APT - Astro Photography Tool APT 3.13

    Filters: Astronomik LRGB 31mm

    Accessory: Skywatcher/Lacerta GPU comacorrector


    Dates:June 4, 2019

    Frames: 48x180"

    Integration: 2.4 hours

    Avg. Moon age: 1.14 days

    Avg. Moon phase: 1.46%


    Basic astrometry details

    Astrometry.net job: 4021469

    RA center: 13h 5' 27"

    DEC center: -49° 28' 26"

    Pixel scale: 0.784 arcsec/pixel

    Orientation: 81.040 degrees

    Field radius: 0.290 degrees


    Resolution: 2123x1610

    Locations: deepskysafaris.com Rooisand, Windhoek, Namibia

    Data source: Traveller

    Description

    NGC4945 is member of the Centaurus A cluster of galaxies and at 12 MLightyears one of the nearest AGN/Seyfert 2/starburst types as well. We look at the spiral almost edge on, and masses of dust filaments are silhouetted against the starforming regions. The superenergetic nucleus is totally hidden inside the bulge, but is extremely bright in IR making NGC4945 the 3rd brightest IR source in the sky (superseded only by M82 and NGC253). There is a powerful H2O maser at work, encircling the nucleus at tremendous speed that points at a supermassive black hole of 1.4 million sunmasses. BeppoSAX and XMMNewton observations in Xrays picture complex plume structures near the nucleus together with a hard variable source. So NGC4945 shows hallmarks of a starburst galaxy and a Seyfert powered nucleus as well. Its still not determined what part contributes more to the intense energy we see at work.

    This information is extracted from "Annals of the Deep Sky" Vol.V, and from the bottom of my heart I wish the authors will be able to continue this unique and important series despite the sad and unexpected closedown of Willman-Bell publishing house.

    Its a pure LRGB with ASI1600 working at gain 75.

    Comments

    Author

    tommy_nawratil
    tommy_nawratil
    License: None (All rights reserved)
    10829
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    Revisions

    • Final
      NGC4945, 



    
        

            tommy_nawratil
      Original
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      C
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      D

    C

    Description: full field

    D

    Description: annotated version

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    NGC4945, 



    
        

            tommy_nawratil