Echoes of multiple outbursts of Sagittarius A* revealed by Chandra · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/1307.3954/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTEchoes of multiple outbursts of Sagittarius A* revealed by Chandra — mentioned by mirimirhttps://news.ycombinator.com/item?id=21186636urn:hackerpapers:mention:1307.3954:21186636Mon, 07 Oct 2019 22:24:04 GMT<p>We already have: Clavel et al. (2013) Echoes of multiple outbursts of Sagittarius A[star] revealed by Chandra.[0] Here&#x27;s the abstract: &gt; The relatively rapid spatial and temporal variability of the X-ray radiation from some molecular clouds near the Galactic center shows that this emission component is due to the reflection of X-rays generated by a source that was luminous in the past, most likely the central supermassive black hole, Sagittarius A[star]. Studying the evolution of the molecular cloud reflection features is therefore a key element to reconstruct Sgr A[star]&#x27;s past activity. The…</p><p><a href="https://hackerpaper.kaipfister.de/p/1307.3954/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.HE