{"id":12194,"date":"2023-10-12T21:35:39","date_gmt":"2023-10-13T01:35:39","guid":{"rendered":"https:\/\/spinor.info\/weblog\/?p=12194"},"modified":"2023-10-12T21:35:39","modified_gmt":"2023-10-13T01:35:39","slug":"more-lensing","status":"publish","type":"post","link":"https:\/\/spinor.info\/weblog\/?p=12194","title":{"rendered":"More lensing"},"content":{"rendered":"<p>I&#8217;m doing more work on gravitational lensing. In particular, the little ray tracing model that I developed can now use actual astronomical images as sources. Here&#8217;s a projection of a nice spiral galaxy as it would be seen through a pair of non-coplanar, imperfectly lined up lenses:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-12196\" src=\"https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/twolens.jpg\" alt=\"\" width=\"500\" height=\"500\" srcset=\"https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/twolens.jpg 500w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/twolens-300x300.jpg 300w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/twolens-150x150.jpg 150w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/twolens-96x96.jpg 96w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/twolens-24x24.jpg 24w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/twolens-36x36.jpg 36w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/twolens-48x48.jpg 48w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/twolens-64x64.jpg 64w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Somehow, I suspect, no astronomer would recognize (at least not without a spectral analysis) that these are four images of the same rather nice-looking galaxy, NGC-4414:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-12195\" src=\"https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/ngc4414.jpg\" alt=\"\" width=\"500\" height=\"500\" srcset=\"https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/ngc4414.jpg 500w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/ngc4414-300x300.jpg 300w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/ngc4414-150x150.jpg 150w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/ngc4414-96x96.jpg 96w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/ngc4414-24x24.jpg 24w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/ngc4414-36x36.jpg 36w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/ngc4414-48x48.jpg 48w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2023\/10\/ngc4414-64x64.jpg 64w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>These lensing examples also demonstrate how difficult it is to reconstruct either the original view, or the mass distribution of the lens itself, when all we see is something like the first image above.<\/p>\n<fb:like href='https:\/\/spinor.info\/weblog\/?p=12194' send='true' layout='standard' show_faces='true' width='450' height='65' action='like' colorscheme='light' font='lucida grande'><\/fb:like>","protected":false},"excerpt":{"rendered":"<p>I&#8217;m doing more work on gravitational lensing. In particular, the little ray tracing model that I developed can now use actual astronomical images as sources. Here&#8217;s a projection of a nice spiral galaxy as it would be seen through a pair of non-coplanar, imperfectly lined up lenses: Somehow, I suspect, no astronomer would recognize (at <a href='https:\/\/spinor.info\/weblog\/?p=12194' class='excerpt-more'>[&#8230;]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,35,3],"tags":[],"class_list":["post-12194","post","type-post","status-publish","format-standard","hentry","category-astronomy","category-personal","category-physics","category-20-id","category-35-id","category-3-id","post-seq-1","post-parity-odd","meta-position-corners","fix"],"_links":{"self":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/12194","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12194"}],"version-history":[{"count":1,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/12194\/revisions"}],"predecessor-version":[{"id":12197,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/12194\/revisions\/12197"}],"wp:attachment":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}