2MASX J0413-0050 transitioned from a narrow-line Seyfert 1 to a Seyfert 1.9 and back while remaining in a high accretion state, supporting classification as a changing-state AGN.
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The Guitar Nebula requires extreme acceleration with η_acc ≳ 3/4 and traverses a dense low-ionization shell from an old supernova remnant in the pressure-driven snowplow regime.
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An X-ray and optical spectral study of the changing-look narrow-line Seyfert 1 2MASX J0413-0050
2MASX J0413-0050 transitioned from a narrow-line Seyfert 1 to a Seyfert 1.9 and back while remaining in a high accretion state, supporting classification as a changing-state AGN.
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Guitar Nebula: extreme accelerator in extreme environment
The Guitar Nebula requires extreme acceleration with η_acc ≳ 3/4 and traverses a dense low-ionization shell from an old supernova remnant in the pressure-driven snowplow regime.