Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
CHANG-ES – VI. Probing Supernova energy deposition in spiral galaxies through multiwavelength relationships
Ist Teil von
Monthly notices of the Royal Astronomical Society, 2016-02, Vol.456 (2), p.1723-1738
Ort / Verlag
London: Oxford University Press
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
How a galaxy regulates its supernovae (SNe) energy into different interstellar/circumgalactic medium components strongly affects galaxy evolution. Based on the JVLA D-configuration C- (6 GHz) and L-band (1.6 GHz) continuum observations, we perform statistical analysis comparing multiwavelength properties of the Continuum Haloes in Nearby Galaxies – an EVLA Survey galaxies. The high-quality JVLA data and edge-on orientation enable us for the first time to include the halo into the energy budget for a complete radio-flux-limited sample. We find tight correlations of L
radio with the mid-IR-based star formation rate (SFR). The normalization of our I
1.6 GHz/W Hz−1–SFR relation is ∼2–3times of those obtained for face-on galaxies, probably a result of enhanced IR extinction at high inclination. We also find tight correlations between L
radio and the SNe energy injection rate
$\dot{E}_{\rm SN(Ia+CC)}$
, indicating the energy loss via synchrotron radio continuum accounts for ∼1 of
$\dot{E}_{\rm SN}$
, comparable to the energy contained in cosmic ray electrons. The integrated C-to-L-band spectral index is α ∼ 0.5–1.1 for non-active galactic nucleus galaxies, indicating a dominance by the diffuse synchrotron component. The low-scatter L
radio–SFR/
$L_{\rm radio}\text{-}\dot{E}_{\rm SN (Ia+CC)}$
relationships have superlinear logarithmic slopes at ∼2σ in L band (1.132 ± 0.067/1.175 ± 0.102) while consistent with linear in C band (1.057 ± 0.075/1.100 ± 0.123). The superlinearity could be naturally reproduced with non-calorimeter models for galaxy discs. Using Chandra halo X-ray measurements, we find sublinear L
X–L
radio relations. These results indicate that the observed radio halo of a starburst galaxy is close to electron calorimeter, and a galaxy with higher SFR tends to distribute an increased fraction of SNe energy into radio emission (than X-ray).