{"id":535,"date":"2020-01-10T09:56:09","date_gmt":"2020-01-10T08:56:09","guid":{"rendered":"http:\/\/obas-matlas.u-strasbg.fr\/WP\/?p=535"},"modified":"2022-01-12T09:42:07","modified_gmt":"2022-01-12T08:42:07","slug":"discovery-of-a-large-h-i-ring-around-the-quiescent-galaxy-agc-203001-associated-paper","status":"publish","type":"post","link":"https:\/\/matlas.astro.unistra.fr\/WP\/?p=535","title":{"rendered":"Discovery of a large H I ring around the quiescent galaxy AGC 203001 (associated paper)"},"content":{"rendered":"\n<figure class=\"wp-block-image\"><img loading=\"lazy\" width=\"1024\" height=\"457\" src=\"http:\/\/obas-matlas.u-strasbg.fr\/WP\/wp-content\/uploads\/2020\/02\/stz2972fig1-1024x457.jpeg\" alt=\"\" class=\"wp-image-536\" srcset=\"https:\/\/matlas.astro.unistra.fr\/WP\/wp-content\/uploads\/2020\/02\/stz2972fig1-1024x457.jpeg 1024w, https:\/\/matlas.astro.unistra.fr\/WP\/wp-content\/uploads\/2020\/02\/stz2972fig1-300x134.jpeg 300w, https:\/\/matlas.astro.unistra.fr\/WP\/wp-content\/uploads\/2020\/02\/stz2972fig1-768x343.jpeg 768w, https:\/\/matlas.astro.unistra.fr\/WP\/wp-content\/uploads\/2020\/02\/stz2972fig1.jpeg 1464w\" sizes=\"(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><figcaption>Balt et al., 2020: the HI ring around AGC 203001<\/figcaption><\/figure>\n\n\n\n<p>Here we report the discovery with the Giant Metrewave Radio Telescope of an extremely large (\u0303115 kpc in diameter) H I ring, located around a massive quenched galaxy, AGC 203001, but off-centered, with respect to it. This ring does not have any bright extended optical counterpart unlike several other known ring galaxies. Our deep g, r, and i optical imaging of the H I ring, using the MegaCam instrument on the Canada-France-Hawaii Telescope, shows however several regions with faint optical emission at a surface brightness level of \u030328 mag\/arcsec<sup>2<\/sup>. <\/p>\n\n\n\n<!--more-->\n\n\n\n<p>Such an extended H I structure is very rare with only one other case known so far &#8211; the Leo ring. Conventionally, off-centered rings have been explained by a collision with an &#8220;intruder&#8221; galaxy leading to expanding density waves of gas and stars in the form of a ring. However, in such a scenario the impact also leads to large amounts of star formation in the ring which is not observed in the ring presented in this paper. We discuss possible scenarios for the formation of such H I dominated rings.<\/p>\n\n\n\n<p><em>Published in Balt et al., 2020:  <a href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2020MNRAS.492....1B\/abstract\">MNRAS 492, 1<\/a>&nbsp;<\/em><br>Press release: <a href=\"https:\/\/astronomy.com\/news\/2020\/01\/a-ring-of-gas-discovered-circling-a-galaxy\">Astronomy<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Here we report the discovery with the Giant Metrewave Radio Telescope of an extremely large (\u0303115 kpc in diameter) H I ring, located around a massive quenched galaxy, AGC 203001, but off-centered, with respect to it. This ring does not have any bright extended optical counterpart unlike several other known ring galaxies. Our deep g, &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/matlas.astro.unistra.fr\/WP\/?p=535\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Discovery of a large H I ring around the quiescent galaxy AGC 203001 (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":[3,4],"tags":[],"_links":{"self":[{"href":"https:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/posts\/535"}],"collection":[{"href":"https:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=535"}],"version-history":[{"count":2,"href":"https:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/posts\/535\/revisions"}],"predecessor-version":[{"id":638,"href":"https:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=\/wp\/v2\/posts\/535\/revisions\/638"}],"wp:attachment":[{"href":"https:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=535"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=535"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/matlas.astro.unistra.fr\/WP\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}