Multi-wavelength Study of the Supernova Remnant Kes 79 (G33.6+0.1): On Its Supernova Properties and Expansion into a Molecular Environment

摘要: Kes 79 (G33.6+0.1) is an aspherical thermal composite supernova remnant (SNR) observed across the electromagnetic spectrum and showing unusual highly structured morphology, in addition to harboring a central compact object (CCO). Using CO J = 1–0, 2–1, 3–2 data, we provide first direct evidence new morphological support physical interaction between SNR molecular cloud local standard of rest velocity ~105 - km s -1. We revisit 380 ks XMM-Newton observations perform dedicated spatially resolved X-ray spectroscopic study with careful background subtraction. The overall X-ray-emitting gas characterized by under-ionized (tc ~ 6 x 10 cm 11 -3) cool (kTc » 0.20 keV) plasma solar abundances, plus (th ´ h 8 1010 cm-3) hot (kTh 0.80 elevated Ne, Mg, Si, S, Ar abundances. filaments, correlated 24 mm IR are suggested be due shock dense gas, while halo forms from breaking out into tenuous medium. appears have double-hemisphere morphology viewed along symmetric axis. Projection effect can explain multiple-shell structures morphology. high-velocity, 1.4 1.6 – ejecta patch high metal together non-uniform distribution SNR, indicate asymmetric SN explosion 79. refine Sedov age 4.4–6.7 kyr mean 730 s-1 1. Our multi-wavelength suggests progenitor mass ∼15–20 masses for core-collapse that formed its CCO, PSR J1852+0040.