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Detection of optical emission from the supernova remnant G7.7-3.7

Autor: Domček, V., Santisteban, J. V. Hernández, Chiotellis, A., Boumis, P., Vink, J., Akras, S., Souropanis, D., Zhou, P., de Burgos, A.

We present the first optical study of the supernova remnant (SNR) G7.7-3.7, with the aim of determining its evolutionary phase since it has been suggested to be the remnant of SN 386 AD. We obtained narrow-band images in the filters H$\alpha$ + [NII]

Externí odkaz: http://arxiv.org/abs/2309.01768

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Multi-epoch properties of the warm absorber in the Seyfert 1 galaxy NGC 985

Autor: Ebrero, J., Domcek, V., Kriss, G. A., Kaastra, J. S.

Publikováno v: A&A 653, A125 (2021)

(Abridged) NGC 985 was observed by XMM-Newton twice in 2015, revealing that the source was coming out from a soft X-ray obscuration event that took place in 2013. These kinds of events are possibly recurrent since a previous XMM-Newton archival obser

Externí odkaz: http://arxiv.org/abs/2107.05676

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Completing the X-ray view of the recently discovered supernova remnant G53.41+0.03

Autor: Domček, V., Vink, J., Zhou, P., Sun, L., Driessen, L.

Publikováno v: A&A 659, A63 (2022)

Aims: We present a detailed X-ray study of the recently discovered supernova remnant (SNR) G53.41+0.03 that follows up and further expands on the previous, limited analysis of archival data covering a small portion of the SNR. Methods: With the new d

Externí odkaz: http://arxiv.org/abs/2105.02661

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Mapping the spectral index of Cas A: evidence for flattening from radio to infrared

Autor: Domček, V., Vink, J., Santisteban, J. V. Hernández, Delaney, T., Zhou, P.

Synchrotron radiation from supernova remnants are caused by electrons accelerated through diffusive shock acceleration (DSA). The standard DSA theory predicts an electron spectral index of $p=2$, corresponding to a radio spectral index of $\alpha=-0.

Externí odkaz: http://arxiv.org/abs/2005.12677

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Steep X-ray reflection emissivity profiles in AGN as the result of radially-structured disc ionisation

Autor: Kammoun, E. S., Domcek, V., Svoboda, J., Dovciak, M., Matt, G.

X-ray observations suggest high compactness of coronae in active galactic nuclei as well as in X-ray binaries. The compactness of the source implies a strong radial dependence in the illumination of the accretion disc. This will, for any reasonable r

Externí odkaz: http://arxiv.org/abs/1902.03481

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A low-frequency view of mixed-morphology supernova remnant VRO 42.05.01, and its neighbourhood

Autor: Arias, M., Vink, J., Iacobelli, M., Domcek, V., Haverkorn, M., Oonk, J. B. R., Polderman, I., Reich, W., White, G. J., Zhou, P.

Mixed-morphology supernova remnants (MM SNRs) are a mysterious class of objects that display thermal X-ray emission within their radio shell. They are an older class of SNRs, and as such are profoundly affected by the environment into which they evol

Externí odkaz: http://arxiv.org/abs/1810.07584

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