3 years ago

# Persistent X-ray emission from ASASSN-15lh: pre-SLSN dense wind?.

Zhuo Li, Yan Huang

The persistent soft X-ray emission at the location of the so-far most luminous supernova (SN), ASASSN-15lh (or SN 2015L), with $L \sim 10^{42} \rm erg~ s^{-1}$, is puzzling. We show that it can be explained by radiation from the SN-shock accelerated electrons inverse-Compton scattering the intense UV photons. In this interpretation, the circumstellar medium is derived to be a wind ($n\propto R^{-2}$) with mass-loss rate of $\dot M \gtrsim 3 \times10^{-3}M_\odot(v_{\rm w}/10^3 \rm km\,s^{-1}) yr^{-1}$, and the initial velocity of the bulk SN ejecta is $\lesssim0.03c$. The non-detection in radio is naturally expected due to strong synchrotron self-absorption and free-free absorption in the dense medium. This constraint implies a strong wind ejected just within $\sim10(v_{\rm w}/10^3 \rm km\,s^{-1})^{-1}$ yrs before the explosion of ASASSN-15lh by its progenitor star.

Publisher URL: http://arxiv.org/abs/1801.07517

DOI: arXiv:1801.07517v2

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.