A detailed reflection grating spectrometer analysis of the outflow of NGC 253

Autor(en)

M. Bauer, W Pietech, Dieter Breitschwerdt, Matthias Ehle, Michael J. Freyberg, Andrew J. Read, Ginevra Trinchieri

Abstrakt

NGC 253 is an edge-on starburst galaxy in the Sculptor group. Observations in X-rays by ROSAT, XMM-Newton and Chandra show a mixture of extended and point source emission in disk and halo (Pietsch et al., 2000, 2001; Strickland et al., 2000; Vogler & Pietsch, 1999). Especially interesting is the connection between the starburst driven outflow from the nuclear region into the halo of the galaxy (plume). We analyzed XMM-Newton data, taken with the Reflection Grating Spectrometer (RGS) in 2000 and 2003 with a total low background exposure time of 127.8 ks. We extracted spectra of the outflow for different regions. Depending on the distance to the center along the south-east semi minor axis of NGC 253, the spectra show many individual emission lines with varying intensity. We used line ratios to characterize the temperature and the ionization mechanism in these regions. Furthermore we extracted narrow-band RGS images to map the spatial origin of the different emission lines.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Max-Planck-Institut für extraterrestrische Physik, European Space Astronomy Centre (ESA), Duke University, INAF Osservatorio Astronomico di Brera

Seiten

443-444

Anzahl der Seiten

2

Publikationsdatum

2006

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/748173a2-0159-428b-b62c-188eed3c4b73