SNR surface density distribution in nearby galaxies

Autor(en)

Manami Sasaki, Dieter Breitschwerdt, Rodrigo Supper

Abstrakt

Since supernova remnants (SNRs) are believed to be the primary sources of Galactic cosmic rays (CRs), their distribution in galaxies is an important basis for modelling and understanding the distribution of the CRs and their ?-ray spectrum. We analysed the radial surface density of X-ray and radio selected SNRs in the Large Magellanic Cloud (LMC) and M 33. Both in X-rays and in radio, the surface densities of the SNRs are in excellent agreement in both galaxies, showing an exponential decay in radius. The results were compared to the SNR distribution in the spiral galaxies M 31 and NGC 6946 as well. The radial scale length of the distribution is 1/4 - 1/3 of the radius of the galaxies, fully consistent with values derived for the Milky Way, the LMC, and M 33. Therefore, not only the radio SNRs, but also the X-ray detected SNR sample can be interpreted to be representative for the CR sources within a galaxy.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Harvard-Smithsonian Center for Astrophysics, Max-Planck-Institut für extraterrestrische Physik

Journal

Astrophysics and Space Science

Band

289

Seiten

283-286

Anzahl der Seiten

4

ISSN

0004-640X

DOI

https://doi.org/10.1023/B:ASTR.0000014956.12840.47

Publikationsdatum

2004

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/67b92a84-3989-4f67-97d7-2fc0a14eb809