{"id":896,"date":"2022-10-19T16:30:00","date_gmt":"2022-10-19T14:30:00","guid":{"rendered":"http:\/\/matlas.astro.unistra.fr\/WP\/?p=896"},"modified":"2024-08-22T11:55:59","modified_gmt":"2024-08-22T09:55:59","slug":"a-0-6-mpc-hi-structure-associated-with-stephans-quintet-associated-paper","status":"publish","type":"post","link":"http:\/\/matlas.astro.unistra.fr\/WP\/?p=896","title":{"rendered":"A 0.6 Mpc HI Structure Associated with Stephan&#8217;s Quintet (associated paper)"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"662\" height=\"560\" src=\"http:\/\/matlas.astro.unistra.fr\/WP\/wp-content\/uploads\/2022\/10\/Capture-de\u0301cran-2022-10-19-a\u0300-14.31.32.png\" alt=\"\" class=\"wp-image-897\" srcset=\"http:\/\/matlas.astro.unistra.fr\/WP\/wp-content\/uploads\/2022\/10\/Capture-de\u0301cran-2022-10-19-a\u0300-14.31.32.png 662w, http:\/\/matlas.astro.unistra.fr\/WP\/wp-content\/uploads\/2022\/10\/Capture-de\u0301cran-2022-10-19-a\u0300-14.31.32-300x254.png 300w\" sizes=\"(max-width: 662px) 100vw, 662px\" \/><figcaption>HI spectra with FAST superimposed on the deep CFHT image<\/figcaption><\/figure>\n\n\n\n<p>Stephan&#8217;s Quintet (SQ, distance=85 Mpc) is unique among compact groups of galaxies. Observations have previously shown that interactions between multiple members, including a high-speed intruder galaxy currently colliding into the intragroup medium, have likely generated tidal debris in the form of multiple gaseous and stellar filaments, the formation of tidal dwarfs and intragroup-medium starbursts, as well as widespread intergalactic shocked gas. The details and timing of the interactions\/collisions remain poorly understood because of the multiple nature. Here we report atomic hydrogen (HI) observations in the vicinity of SQ with a smoothed sensitivity of 1\u03c3\u03c3=4.2&nbsp;\u00d71016cm\u22122\u00d71016cm\u22122&nbsp;per channel (\u0394\u0394v=20 km s\u22121\u22121; angular-resolution=4&#8242;), which are about two orders of magnitude deeper than previous observations. The data reveal a large HI structure (linear scale ~0.6 Mpc) encompassing an extended source of size ~0.4 Mpc associated with the debris field and a curved diffuse feature of length ~0.5 Mpc attached to the south edge of the extended source. The diffuse feature was likely produced by tidal interactions in early stages of SQ (&gt;1 Gyr ago), though it is not clear how the low density HI gas (NHI\u22641018cm\u22122HI\u22641018cm\u22122) can survive the ionization by the inter-galactic UV background on such a long time scale. Our observations require a rethinking of gas in outer parts of galaxy groups and demand complex modeling of different phases of the intragroup medium in simulations of group formation.<\/p>\n\n\n\n<p>Xu et al., 2022, <a href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2022arXiv220804870X\/abstract\">Nature 610, 461<\/a> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Stephan&#8217;s Quintet (SQ, distance=85 Mpc) is unique among compact groups of galaxies. Observations have previously shown that interactions between multiple members, including a high-speed intruder galaxy currently colliding into the intragroup medium, have likely generated tidal debris in the form of multiple gaseous and stellar filaments, the formation of tidal dwarfs and intragroup-medium starbursts, as &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/matlas.astro.unistra.fr\/WP\/?p=896\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;A 0.6 Mpc HI Structure Associated with Stephan&#8217;s Quintet (associated paper)&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"_links":{"self":[{"href":"http:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/posts\/896"}],"collection":[{"href":"http:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=896"}],"version-history":[{"count":2,"href":"http:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/posts\/896\/revisions"}],"predecessor-version":[{"id":1004,"href":"http:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/posts\/896\/revisions\/1004"}],"wp:attachment":[{"href":"http:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=896"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}