{"id":964695,"date":"2026-05-16T16:50:16","date_gmt":"2026-05-16T16:50:16","guid":{"rendered":"https:\/\/www.europesays.com\/uk\/964695\/"},"modified":"2026-05-16T16:50:16","modified_gmt":"2026-05-16T16:50:16","slug":"astronomers-observe-interstellar-turbulence-twisting-and-distorting-light-across-our-galaxy","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/uk\/964695\/","title":{"rendered":"Astronomers Observe Interstellar Turbulence Twisting and Distorting Light Across Our Galaxy"},"content":{"rendered":"

A team of astronomers has captured unprecedented details of how turbulence in the Milky Way\u2019s interstellar medium bends and distorts light from distant cosmic sources. Using nearly a decade of archival data, researchers revealed that the radio waves from a quasar 10 billion light-years away are shaped by the chaotic clouds of ionized gas and electrons within our galaxy. This discovery, published in the Astrophysical Journal Letters, opens a new window into understanding the invisible forces shaping the space between stars.<\/p>\n

Tracing the Quasar Through a Turbulent Galaxy<\/p>\n

The quasar, TXS 2005+403<\/strong>, shines from the constellation Cygnus, powered by a supermassive black hole billions of light-years distant. As its radio waves traverse the Milky Way<\/a>, they pass through the highly turbulent Cygnus region, one of the galaxy\u2019s most strongly scattering environments. Rather than fading into a simple blur, the waves revealed structured, patchy distortions, providing a rare opportunity to study the dynamics of interstellar turbulence.<\/p>\n

\n

\u201cMost of what we see in the radio data isn\u2019t coming from the quasar itself, it\u2019s coming from the scattering caused by the turbulence in this region of the Milky Way,\u201d Dr. Alexander Plavin of Harvard & Smithsonian\u2019s Center for Astrophysics said. \u201cThat scattering and the distortions that come with it are what allows us to study the turbulence and better understand and infer its structure.\u201d<\/p>\n<\/blockquote>\n

By carefully analyzing archival data from NSF\u2019s Very Long Baseline Array (VLBA), the team tracked how the quasar\u2019s light changed over nearly ten years. This long-term study revealed that turbulence is not random noise but instead creates persistent patterns in the signal, a finding that challenges prior assumptions about the chaotic interstellar medium.<\/p>\n

\"Apjlae60f4f1Visibility amplitude versus projected baseline length or\u00a0uv\u00a0distance. Experiments with the best sensitivity and coverage are shown in each frequency band, from left to right: 1.4, 2.3, and 5\u00a0GHz. Data (black dots with 1\u03c3\u00a0error bars) are self-calibrated to per-IF elliptical Gaussian models (blue dots). The blue shaded band shows the average Gaussian model within each band. The predicted refractive substructure signal is shown as the orange band starting from the\u00a0uv\u00a0distance where the Gaussian model first falls to 25% of its peak. Its calculations assume scattering with broadening size equal to the average axis of the Gaussian (see Section\u00a03.3<\/a>).
Credit: Astrophysical Journal Letters.<\/p>\n

Unexpected Patterns Challenge Assumptions<\/p>\n

Conventional models suggested that the quasar\u2019s radio waves would blur and vanish as they passed through turbulent regions. Instead, astronomers detected distinct signals even at the farthest telescope pairs.<\/p>\n

\n

\u201cThe most distant pairs of telescopes should not have seen the quasar image, but to our surprise, they clearly detected its signal, or faint glow,\u201d Dr. Plavin said. \u201cIt can\u2019t be explained by simple blurring or by the quasar itself, and it behaves the way turbulence is expected to, which is how we know we\u2019re seeing the effects of interstellar turbulence.\u201d<\/p>\n<\/blockquote>\n

These persistent distortions provide a unique probe of the Milky Way\u2019s ionized gas clouds, revealing structure on scales previously impossible to measure. The findings also suggest that the same turbulent processes could affect other observations of distant galaxies, supernovae, and cosmic radio sources.<\/p>\n

\"Apjlae60f4f2Elliptical Gaussian fits to VLBA observations at 1\u20135\u00a0GHz. Top: Gaussian contours at the half-maximum level (FWHM) in R.A.\u2013decl. space; each ellipse represents a single observation, with sizes normalized by\u00a0\u03bd2\u00a0for direct comparison across frequencies. Middle and bottom: frequency dependence of Gaussian major and minor axes (middle) and position angle (bottom); each point represents a single IF with 2\u03c3\u00a0uncertainties shown. All panels show clear \u2248\u03bd\u22122\u00a0size scaling (5\u00a0GHz is excluded from the power-law fit) and consistent elongation along the Galactic plane.
Credit: Astrophysical Journal Letters.<\/p>\n

Implications for Astronomy and Future Research<\/p>\n

Understanding the behavior of interstellar turbulence is critical for astronomers interpreting radio observations. The study demonstrates that even distant, bright sources like quasars can be reshaped by the space they traverse. According to the research published in Astrophysical Journal Letters<\/a>.<\/p>\n

\u201cThe scattering properties along this line of sight through the Galaxy remain persistent over time,\u201d<\/p>\n

highlighting the stability of certain turbulent features despite the dynamic environment.<\/p>\n

The team hopes this work will inspire further long-term studies using VLBA and other radio observatories. By mapping turbulence across multiple lines of sight, astronomers can build a three-dimensional picture of the Milky Way\u2019s ionized gas, informing models of star formation, cosmic ray propagation, and galactic evolution.<\/p>\n","protected":false},"excerpt":{"rendered":"A team of astronomers has captured unprecedented details of how turbulence in the Milky Way\u2019s interstellar medium bends…\n","protected":false},"author":2,"featured_media":964696,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3845],"tags":[74,70,16,15],"class_list":{"0":"post-964695","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-physics","8":"tag-physics","9":"tag-science","10":"tag-uk","11":"tag-united-kingdom"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@uk\/116585290035853024","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts\/964695","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/comments?post=964695"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts\/964695\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/media\/964696"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/media?parent=964695"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/categories?post=964695"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/tags?post=964695"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}