{"id":21671,"date":"2026-09-10T18:13:35","date_gmt":"2026-09-10T18:13:35","guid":{"rendered":"https:\/\/8657085.xyz\/?p=21671"},"modified":"2026-09-10T18:13:35","modified_gmt":"2026-09-10T18:13:35","slug":"chandras-hypersoft-hunt-reveals-84-mysterious-cosmic-x-ray-beacons-that-surveys-kept-missing","status":"publish","type":"post","link":"https:\/\/8657085.xyz\/?p=21671","title":{"rendered":"Chandra\u2019s Hypersoft Hunt Reveals 84 Mysterious Cosmic X-Ray Beacons That Surveys Kept Missing"},"content":{"rendered":"<p> <div style=\"display: grid; grid-template-columns: 300px 160px; gap: 2px; width: 460px; background: #eee; padding: 2px;\">\r\n\r\n  <!-- \u6574\u884c\u5bbd\u5e7f\u544a -->\r\n  <div style=\"grid-column: 1\/-1; width: 460px; height: 250px; background: #ccc; display: grid; place-items: center;\">\r\n  <script async type=\"application\/javascript\" src=\"https:\/\/a.magsrv.com\/ad-provider.js\"><\/script> \r\n <ins class=\"eas6a97888e2\" data-zoneid=\"5876674\"><\/ins> \r\n <script>(AdProvider = window.AdProvider || []).push({\"serve\": {}});<\/script>\r\n  <\/div>\r\n  <div style=\"grid-column: 1\/-1; width: 460px; height: 90px; background: #ccc; display: grid; place-items: center;\">\r\n  <script async type=\"application\/javascript\" src=\"https:\/\/a.magsrv.com\/ad-provider.js\"><\/script> \r\n <ins class=\"eas6a97888e2\" data-zoneid=\"5876676\"><\/ins> \r\n <script>(AdProvider = window.AdProvider || []).push({\"serve\": {}});<\/script>\r\n  <\/div>\r\n\r\n  <!-- \u5de6\u4fa7\u7ad6\u6392 -->\r\n  <div style=\"height: 250px; background: #ccc; display: grid; place-items: center;\">\r\n  <script async type=\"application\/javascript\" src=\"https:\/\/a.magsrv.com\/ad-provider.js\"><\/script> \r\n <ins class=\"eas6a97888e2\" data-zoneid=\"5876672\"><\/ins> \r\n <script>(AdProvider = window.AdProvider || []).push({\"serve\": {}});<\/script>\r\n  <\/div>\r\n  <div style=\"height: 500px; background: #ccc; display: grid; place-items: center;\">\r\n  <script async type=\"application\/javascript\" src=\"https:\/\/a.magsrv.com\/ad-provider.js\"><\/script> \r\n <ins class=\"eas6a97888e2\" data-zoneid=\"5876680\"><\/ins> \r\n <script>(AdProvider = window.AdProvider || []).push({\"serve\": {}});<\/script>\r\n  <\/div>\r\n\r\n  <!-- \u53f3\u4fa7\u6469\u5929\u697c\uff08\u548c\u5de6\u4fa7\u5b8c\u5168\u5bf9\u9f50\uff09 -->\r\n  <div style=\"grid-row: 3\/5; height: 750px; background: #ccc; display: grid; place-items: center;\">\r\n  <script async type=\"application\/javascript\" src=\"https:\/\/a.magsrv.com\/ad-provider.js\"><\/script> \r\n <ins class=\"eas6a97888e2\" data-zoneid=\"5876678\"><\/ins> \r\n <script>(AdProvider = window.AdProvider || []).push({\"serve\": {}});<\/script>\r\n  <\/div>\r\n  \r\n  <script async type=\"application\/javascript\" src=\"https:\/\/a.magsrv.com\/ad-provider.js\"><\/script> \r\n <ins class=\"eas6a97888e6\" data-zoneid=\"5876682\"><\/ins> \r\n <script>(AdProvider = window.AdProvider || []).push({\"serve\": {}});<\/script>\r\n<\/div><br \/>\n<\/p>\n<div>\n<p><img decoding=\"async\" src=\"https:\/\/images.techeblog.com\/wp-content\/uploads\/2026\/09\/10103847\/nasa-chandra-x-ray-observatory-mysterious-hss-objects.jpg\" alt=\"NASA Chandra X-ray Observatory Mysterious HSS Objects\" width=\"960\" height=\"640\"\/><br \/>Mustafa Muhibullah did not set out to name a new class of object. He was a University of Alabama graduate student working through public Chandra X-ray Observatory files that other groups had already used. In the softest sliver of those files, sources lit up and then disappeared as soon as the energy cut moved a little higher. Artifacts were the first suspicion. Stacked exposures and careful cleaning left something real.<\/p>\n<p><span id=\"more-257391\"\/><br \/><iframe title=\"Quick Look: NASA&amp;apos;s Chandra Unveils Mysterious X-ray Objects\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/1goUxP56Pnc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><noscript><iframe title=\"Quick Look: NASA&amp;apos;s Chandra Unveils Mysterious X-ray Objects\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/1goUxP56Pnc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/noscript><br \/>We\u2019re talking about Hypersoft X-ray sources, or HSS. They mostly emit energy between 0.15 and 0.3 keV, which is below the Chandra telescope\u2019s detection limit, and emit significantly less energy above 0.3 keV. A useful cut is the photon ratio in these two bands, which is around 8 to 1, as used in a Nature Astronomy publication. Unfortunately, most of these sources are left out in the cold by typical catalogs, as the lowest band is usually only recorded as background noise.<\/p>\n<div class=\"aawp\">\n<div class=\"aawp-product aawp-product--horizontal\" data-aawp-product-asin=\"B0G2T1RCPX\" data-aawp-product-id=\"257266\" data-aawp-tracking-id=\"tec02e-20\" data-aawp-product-title=\"LEGO Icons Hubble Space Telescope 11382\">\n<div class=\"aawp-product__thumb\">\n<p>            <img decoding=\"async\" class=\"aawp-product__image\" src=\"https:\/\/m.media-amazon.com\/images\/I\/41EYUggfRjL._SL160_.jpg\" alt=\"LEGO Icons Hubble Space Telescope 11382\"\/><\/p><\/div>\n<div class=\"aawp-product__content\">\n<p>            LEGO Icons Hubble Space Telescope 11382        <\/p>\n<div class=\"aawp-product__description\">\n<ul>\n<li>EXPLORE THE HUBBLE SPACE TELESCOPE \u2013 Celebrate one of humanity\u2019s greatest scientific feats while enjoying a relaxing building experience with the&#8230;<\/li>\n<li>REPLICA SPACE MODEL \u2013 Recreate the legendary space-based telescope with posable solar arrays and antennas, an opening aperture door and a detailed&#8230;<\/li>\n<li>AUTHENTIC DETAILS \u2013 Remove the exterior panels to reveal a detailed instrument bay, which features gyroscopes alongside primary and secondary&#8230;<\/li>\n<\/ul><\/div>\n<\/p><\/div>\n<\/div>\n<\/div>\n<p>\n<img decoding=\"async\" src=\"https:\/\/images.techeblog.com\/wp-content\/uploads\/2026\/09\/10103836\/nasa-chandra-x-ray-observatory-mysterious-hss-objects-1.jpg\" alt=\"NASA Chandra X-ray Observatory Mysterious HSS Objects\" width=\"1280\" height=\"1280\"\/><br \/>\nEighty-four of these sources have survived the cut in six nearby galaxies, including Andromeda (18) and M101, the Pinwheel Galaxy (7). You can see them circled in Chandra\u2019s new composite with Hubble. The collection is then completed by four ellipticals: NGC 3115 (18), NGC 3379 (12), NGC 4697 (8), and the gigantic ellipse NGC 4472 (21). They can be found in spiral arms where new stars are being formed, or in older populations where this has already been completed. M101\u2019s seven are indistinguishable from other tiny specks of paired stars.<\/p>\n<p>Narrow band luminosities range from 10^35 erg\/s in nearby M31 to 10^38 erg\/s in distant ellipticals. Meanwhile, models of the entire image imply that the \u2018proper\u2019 output is substantially larger; much of that energy will be far beyond Chandra\u2019s range, in the extreme ultraviolet range, but the majority of it will be absorbed by interstellar hydrogen and helium. What little bit makes it through is barely discernible in Chandra\u2019s softest band. Temperatures range from 200,000 to 280,000 degrees Celsius, which is quite cold compared to many other X-ray sources but still rather high, the kind of temperatures at which ultraviolet begins to show.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/images.techeblog.com\/wp-content\/uploads\/2026\/09\/10103842\/nasa-chandra-x-ray-observatory-mysterious-hss-objects-2.jpg\" alt=\"NASA Chandra X-ray Observatory Mysterious HSS Objects\" width=\"1280\" height=\"1280\"\/><br \/>One of the advisors, Jimmy Irwin, stated that he believes white dwarfs would account for at least a portion of this group. White dwarfs can readily handle temperatures like this. Rosanne Di Stefano of the Center for Astrophysics is less sure, envisioning a combination of accreting white dwarfs, post-nova systems, black holes, and neutron stars. As it happens, a few of the dim M31 sources appear to line up with known novae that have cooled down to this state several years after the massive optical explosion that gave birth to them. Di Stefano doesn\u2019t mince her words, because these hypersoft sources don\u2019t just come from one type of engine or radiation source.<\/p>\n<\/p><\/div>\n<p><!-- \u603b\u5bb9\u5668\uff1a\u6700\u5927\u5bbd908px Grid\u7d27\u51d1\u5e03\u5c40 -->\r\n<div style=\"display: grid; grid-template-columns: 728px 160px; gap:2px; width:908px; background:#eee; padding:2px;\">\r\n\r\n  <!-- \u901a\u680f\u9876\u90e8\uff1a\u6700\u5927\u6a2a\u5e45 908x258 \u8de8\u6574\u884c -->\r\n  <div style=\"grid-column:1\/-1; height:258px; background:#ff6b6b; display:grid; place-items:center;\">\r\n    <!-- JuicyAds v3.0 -->\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async src=\"https:\/\/poweredby.jads.co\/js\/jads.js\"><\/script>\r\n<ins id=\"1114307\" data-width=\"908\" data-height=\"258\"><\/ins>\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async>(adsbyjuicy = window.adsbyjuicy || []).push({'adzone':1114307});<\/script>\r\n<!--JuicyAds END-->\r\n  <\/div>\r\n\r\n  <!-- \u7b2c\u4e8c\u901a\u680f\uff1a728\u00d790 \u901a\u680f -->\r\n  <div style=\"grid-column:1\/-1; 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background:#ffe066; display:grid; place-items:center;\">\r\n\t<!-- JuicyAds v3.0 -->\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async src=\"https:\/\/poweredby.jads.co\/js\/jads.js\"><\/script>\r\n<ins id=\"1114299\" data-width=\"300\" data-height=\"250\"><\/ins>\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async>(adsbyjuicy = window.adsbyjuicy || []).push({'adzone':1114299});<\/script>\r\n<!--JuicyAds END-->\r\n\t<\/div>\r\n    <div style=\"height:250px; background:#ff9ecd; display:grid; place-items:center;\">\r\n\t<!-- JuicyAds v3.0 -->\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async src=\"https:\/\/poweredby.jads.co\/js\/jads.js\"><\/script>\r\n<ins id=\"1114305\" data-width=\"250\" data-height=\"250\"><\/ins>\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async>(adsbyjuicy = window.adsbyjuicy || []).push({'adzone':1114305});<\/script>\r\n<!--JuicyAds END-->\r\n\t<\/div>\r\n    <div style=\"height:139px; background:#c792ea; display:grid; place-items:center;\">\r\n\t<!-- JuicyAds v3.0 -->\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async src=\"https:\/\/poweredby.jads.co\/js\/jads.js\"><\/script>\r\n<ins id=\"1114302\" data-width=\"133\" data-height=\"139\"><\/ins>\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async>(adsbyjuicy = window.adsbyjuicy || []).push({'adzone':1114302});<\/script>\r\n<!--JuicyAds END-->\r\n\t<\/div>\r\n    <div style=\"height:125px; background:#91e7ac; display:grid; place-items:center;\">\r\n\t\r\n<!-- JuicyAds v3.0 -->\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async src=\"https:\/\/poweredby.jads.co\/js\/jads.js\"><\/script>\r\n<ins id=\"1114303\" data-width=\"125\" data-height=\"125\"><\/ins>\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async>(adsbyjuicy = window.adsbyjuicy || []).push({'adzone':1114303});<\/script>\r\n<!--JuicyAds END-->\r\n\t<\/div>\r\n  <\/div>\r\n\r\n  <!-- \u53f3\u4fa7\u7ad6\u680f\uff1a160\u00d7600 \u6574\u5217\u9ad8\u5e7f\u544a -->\r\n  <div style=\"grid-row:3\/8; height:600px;  display:grid; place-items:center;\">\r\n    <!-- JuicyAds v3.0 -->\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async src=\"https:\/\/poweredby.jads.co\/js\/jads.js\"><\/script>\r\n<ins id=\"1114301\" data-width=\"160\" data-height=\"600\"><\/ins>\r\n<script type=\"text\/javascript\" data-cfasync=\"false\" async>(adsbyjuicy = window.adsbyjuicy || []).push({'adzone':1114301});<\/script>\r\n<!--JuicyAds END-->\r\n  <\/div>\r\n\r\n<\/div><br \/>\n<br \/> Chandra\u2019s Hypersoft Hunt Reveals 84 Mysterious Cosmic X-Ray Beacons That Surveys Kept Missing<br \/>\n<br \/>#Chandras #Hypersoft #Hunt #Reveals #Mysterious #Cosmic #XRay #Beacons #Surveys #Missing<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mustafa Muhibullah did not set out to name a new class of object. He was&#8230;<\/p>\n","protected":false},"author":1,"featured_media":21672,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[15934,15932,12747,2270,15933,428,6471,653,15935,15044],"class_list":["post-21671","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech","tag-beacons","tag-chandras","tag-cosmic","tag-hunt","tag-hypersoft","tag-missing","tag-mysterious","tag-reveals","tag-surveys","tag-xray"],"featured_image_urls":{"full":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects.jpg",960,640,false],"thumbnail":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects-150x150.jpg",150,150,true],"medium":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects-300x200.jpg",300,200,true],"medium_large":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects-768x512.jpg",640,427,true],"large":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects.jpg",640,427,false],"1536x1536":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects.jpg",960,640,false],"2048x2048":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects.jpg",960,640,false],"covernews-slider-full":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects.jpg",960,640,false],"covernews-slider-center":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects-800x500.jpg",800,500,true],"covernews-featured":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects.jpg",960,640,false],"covernews-medium":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects-540x340.jpg",540,340,true],"covernews-medium-square":["https:\/\/8657085.xyz\/wp-content\/uploads\/2026\/09\/nasa-chandra-x-ray-observatory-mysterious-hss-objects-400x250.jpg",400,250,true]},"author_info":{"display_name":"admin","author_link":"https:\/\/8657085.xyz\/?author=1"},"category_info":"<a href=\"https:\/\/8657085.xyz\/?cat=8\" rel=\"category\">Tech<\/a>","tag_info":"Tech","comment_count":"0","_links":{"self":[{"href":"https:\/\/8657085.xyz\/index.php?rest_route=\/wp\/v2\/posts\/21671","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/8657085.xyz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/8657085.xyz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/8657085.xyz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/8657085.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=21671"}],"version-history":[{"count":0,"href":"https:\/\/8657085.xyz\/index.php?rest_route=\/wp\/v2\/posts\/21671\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/8657085.xyz\/index.php?rest_route=\/wp\/v2\/media\/21672"}],"wp:attachment":[{"href":"https:\/\/8657085.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21671"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/8657085.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21671"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/8657085.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21671"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}