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At the center of the galaxy Markarian 501, a second stream of high-energy emission appears alongside a previously known jet, both emerging from the same compact region.<\/p>\n
By analyzing long-term radio observations, Silke Britzen at the Max Planck Institute for Radio Astronomy (MPIFR<\/a>) linked the dual jets directly to activity in that crowded core.<\/p>\n Repeated changes in brightness and structure trace a 121-day cycle that matches the expected motion of two massive objects circling each other.<\/p>\n That pattern narrows the explanation to a binary system nearing its final stages, while leaving enough uncertainty to require continued observation before confirmation.<\/p>\n Why the beam brightened<\/p>\n Because a blazar<\/a> is a galaxy core aimed almost straight at Earth, Markarian 501\u2019s first beam looks unusually bright.<\/p>\n Light from the forward beam gets boosted because material racing near light speed points roughly toward us and sends more radiation our way.<\/p>\n That alignment helped astronomers notice the known beam in older observations long before the fainter second signal became clear.<\/p>\n A blazar can hide complexity, since one bright beam can drown out weaker structures near the same center for decades.<\/p>\n Radio maps narrowed<\/p>\n Across 83 observing sessions, the team rechecked high-frequency radio images collected from 2011 through 2023 instead of starting from scratch.<\/p>\n Those images came from the Very Long Baseline Array, ten linked radio antennas across the United States from Hawaii to New England.<\/p>\n Working together, the antennas sharpened the view enough to separate features packed near the galaxy\u2019s active center despite the vast distance.<\/p>\n Without that long record, a strange bend could look like noise instead of motion repeating over time inside a changing core.<\/p>\n The timing clue<\/p>\n Brightness in the core rose and fell on a possible 121-day cycle, matching repeated appearances of the second beam.<\/p>\n A longer seven-year wobble also appeared, suggesting the whole inner structure slowly changes its angle over time.<\/p>\n In the team\u2019s model, the shorter rhythm marks orbiting black<\/a> holes while the longer one marks orbital tilt.<\/p>\n Those periods<\/a> matter because the model puts the final collision within about 100 years, close enough for measurable change.<\/p>\n A ringlike clue<\/p>\n On June 24, 2022, one radio image near the core showed the second beam bent into a partial ring.<\/p>\n Gravity can curve light, and gravitational lensing \u2013 light bent by massive objects \u2013 can create arcs when alignment is right.<\/p>\n Here, the known central black hole may have bent light from material moving behind it toward Earth.<\/p>\n That reading fits the two-black-hole picture, but one odd image cannot settle the case alone for everyone.<\/p>\n Why caution remains<\/p>\n Independent astronomers treated the claim carefully because old binary candidates often fade under closer testing when new data arrive.<\/p>\n Complex jet behavior can fool observers when bright gas, viewing angle, and limited snapshots line up badly around a black hole.<\/p>\n For now, the safer label is a candidate, even though the second beam<\/a> makes the case hard to ignore in this object.<\/p>\n \u201cThere is hope,\u201d Britzen said, pointing to future timing tests that could make or break the claim during careful monitoring.<\/p>\n Gravity may speak<\/p>\n Modern gravitational waves<\/a> are tiny stretches in space and time, and they entered astronomy when observatories caught merging black holes in 2015.<\/p>\n Those earlier black holes were much smaller by comparison, and their final signal lasted less than one second.<\/p>\n A merger in Markarian 501 would involve giants, each estimated between 100 million and one billion Suns, making the signal unusually large.<\/p>\n Such a crash would shake space at lower frequencies, beyond today\u2019s ground detectors but within pulsar timing reach.<\/p>\n Pulsars may help<\/p>\n Instead, Pulsar Timing Arrays (PTA<\/a>) are networks of star clocks watched from Earth, and they may catch slow waves from giants.<\/p>\n Pulsars send steady radio pulses, and passing waves can slightly change when those pulses arrive across many years of observations.<\/p>\n Recent timing results already show a shared low-frequency signal across dozens of pulsars in our galaxy, which makes the method credible here.<\/p>\n Markarian 501 could become a named source, not just part of a background signal, if its waves separate clearly.<\/p>\n What astronomers watch<\/p>\n Over the next decade, the key test is whether the 121-day rhythm in the radio core grows shorter.<\/p>\n Shrinking time<\/a> between cycles would mean the suspected black holes are losing energy and moving closer as gravity carries energy away.<\/p>\n If the period stays fixed or disappears, another explanation for the second beam will gain strength for the strange pattern.<\/p>\n That makes the galaxy valuable either way, because failure would still teach researchers how jets mislead in active galaxies.<\/p>\n A measured countdown<\/p>\n Markarian 501 now gives astronomers a rare target where light, timing, and gravity can be checked together over human timescales.<\/p>\n Confirmation would turn a distant galaxy into a tracked system for the final stage of giant black hole mergers before collision.<\/p>\n The study is published in Monthly Notices of the Royal Astronomical Society<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read?\u00a0Subscribe to our newsletter\u00a0<\/a>for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on\u00a0EarthSnap\u00a0<\/a>, a free app brought to you by\u00a0Eric Ralls\u00a0<\/a>and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Researchers have detected a second jet emerging from the core of a distant galaxy, revealing strong evidence that…\n","protected":false},"author":2,"featured_media":607834,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[199,79],"class_list":["post-607833","post","type-post","status-publish","format-standard","has-post-thumbnail","category-physics","tag-physics","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/607833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/comments?post=607833"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/607833\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media\/607834"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media?parent=607833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/categories?post=607833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/tags?post=607833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}