File:Bodeandcigar.jpg
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Captions
Captions
Bode (M81) and Cigar (M82) galaxies in Ursa Major
Summary
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| Description |
English: On the left is the galaxy named after its discoverer Johann Elert Bode — Bode's Galaxy (Messier 81) — and on the right is the galaxy called the Cigar Galaxy (Messier 82) due to its shape. Both galaxies are located about 12 million light-years away from us. Bode is a classic spiral galaxy with a diameter of approximately 90,000 light-years, while the Cigar is a prototypical starburst galaxy — a galaxy undergoing extremely active star formation. This activity is believed to have been triggered by the Cigar's recent (in cosmic terms) close passage by Bode, which disturbed the hydrogen gas within the galaxy that had been in relative gravitational equilibrium. As a result, although the Cigar is about ten times smaller than the Milky Way, it is five times brighter, and its core is a hundred times brighter. In the Cigar Galaxy, one can also see reddish hydrogen gas filaments stretching thousands of light-years from its center. In addition to the two large galaxies, Bode's orbit also hosts a small satellite galaxy called Holmberg IX.
The photo was taken in early March 2024 from the town of Tõrva, Estonia. Equipment used:
Exposure time: 233 x 180 seconds (+50 flat frames, 50 dark flats, 50 darks) Software: PHD2, N.I.N.A, PixInsight, Photoshop
Eesti: Vasakul selle avastaja Johann Elert Bode järgi Bode nime kandev galaktika (Messier 81) ja paremal kuju järgi Sigariks kutsutud galaktika (Messier 82). Mõlemad galaktikad asuvad meist umbes 12 miljoni valgusaasta kaugusel. Bode on klassikaline spiraalgalaktika, läbimõõduga umbes 90 tuhat valgusaastat ja Sigar on prototüüpne tähepurske galaktika ehk galaktika, milles käib väga aktiivne täheteke. Selle põhjustajaks arvatakse olevat Sigari kosmilises mõttes hiljutine möödumine Bodest, mis häiris suhtelises gravitatsioonilises tasakaalus viibivat galaktikasisest vesinikgaasi. Selle tulemusel on Linnuteest umbes kümme korda väiksem Sigar sellest viis korda heledam ja selle tuum sada korda heledam. Sigari puhul on näha ka selle keskmest väljaulatuvaid tuhandeid valgusaastaid pikki punakaid vesinikgaasi filamente. Lisaks kahele suurele galaktikale on Bode orbiidil näha selle pisikest satelliitgalaktikat Holmberg IX.
Foto on tehtud 2024. aasta märtsi alguses Eestist, Tõrva linnast. Kasutatud tehnika:
Säriaeg: 233x180sekundit (+50 tasavälja, 50 tumedat tasavälja, 50 tumedat) Tarkvara: PHD2, N.I.N.A, PixInsight, Photoshop |
| Date | |
| Source | Own work |
| Author | Taavi Niittee/Tõrva Astronoomiaklubi/Tõrva Astronomy Club |
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| current | 12:24, 3 November 2025 | | 4,621 × 2,986 (7.59 MB) | Nielander (talk | contribs) | Uploaded own work with UploadWizard |
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