{"id":697,"date":"2025-02-25T00:17:16","date_gmt":"2025-02-25T00:17:16","guid":{"rendered":"https:\/\/www.lonepeak.space\/?p=697"},"modified":"2025-03-26T15:32:18","modified_gmt":"2025-03-26T15:32:18","slug":"ngc-4395-2","status":"publish","type":"post","link":"https:\/\/www.lonepeak.space\/index.php\/2025\/02\/25\/ngc-4395-2\/","title":{"rendered":"NGC 4395"},"content":{"rendered":"\n
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\"\"<\/a><\/figure>\n<\/figure>\n\n\n\n

Wikipedia Description:<\/strong><\/p>\n\n\n\n

NGC 4395<\/strong> is a nearby low surface brightness<\/a> spiral galaxy<\/a> located about 14 million light-years<\/a> (or 4.3 Mpc<\/a>) from Earth<\/a> in the constellation Canes Venatici<\/a>.[1]<\/a><\/sup> The nucleus of NGC 4395 is active<\/a> and the galaxy is classified as a Seyfert<\/a> Type I known for its very low-mass supermassive black hole<\/a>.[4]<\/a><\/sup><\/p>\n\n\n\n

Physical characteristics<\/h2>\n\n\n\n

NGC 4395 has a halo that is about 8\u2032<\/a> in diameter. It has several patches of greater brightness running northwest to southeast. The one furthest southeast is the brightest. Three of the patches have their own NGC numbers: 4401, 4400, and 4399 running east to west.[3]<\/a><\/sup><\/p>\n\n\n\n

The galaxy is highly unusual for Seyfert galaxies, because it does not have a bulge<\/a> and is considered to be a dwarf galaxy<\/a>.[4]<\/a><\/sup><\/p>\n\n\n\n

Observational history<\/h2>\n\n\n\n

NGC 4395 was imaged and classified as a “spiral nebula<\/a>” in a 1920 paper by astronomer<\/a> Francis G. Pease<\/a>.[5]<\/a><\/sup> Now, it is known to be a galaxy distinct from the Milky Way<\/a> (see Great Debate<\/a>). Along with several other nearby galaxies, resolved stars in NGC 4395 were used to measure the expansion rate of the Universe<\/a> by Allan Sandage<\/a> and Gustav Andreas Tammann<\/a> in their 1974 paper.[6]<\/a><\/sup> More recently, NGC 4395 was discovered to contain a very low-luminosity active galactic nucleus.[7]<\/a><\/sup> Since then, its nucleus has been the subject of several academic papers and attempts to measure the mass of its central black hole.<\/p>\n\n\n\n

Nucleus<\/h2>\n\n\n\n

NGC 4395 is one of the least luminous and nearest Seyfert galaxies known.[4]<\/a><\/sup> The nucleus of NGC 4395 is notable for containing one of the smallest supermassive black holes<\/a> with a well-measured mass.[8]<\/a><\/sup> The central black hole has a mass of “only” 300,000 M<\/var>\u2609<\/sub><\/a>.[9]<\/a><\/sup> However, a recent study found a black hole mass of just 10,000 M<\/var>\u2609<\/sub><\/a>.[10]<\/a><\/sup> The low-mass black hole in NGC 4395 would make it a so-called “intermediate-mass black hole<\/a>“.[11]<\/a><\/sup> The black hole may have a truncated disk. [12]<\/a><\/sup><\/p>\n\n\n\n

Wikipedia: NGC 4395<\/a><\/p>\n\n\n\n

<\/div>\n\n\n\n

Acquisition Details:<\/p>\n\n\n\n

Telescope<\/td>Takahashi TOA-130<\/td><\/tr>
Optics<\/td>Takahashi TOA-645 Flattener<\/td><\/tr>
Filter<\/td>None<\/td><\/tr>
Camera<\/td>ASI2600MC Pro OSC<\/td><\/tr>
Integration Time<\/td>11.5 Hours<\/td><\/tr>
Subframes<\/td>230 x 180 Seconds<\/td><\/tr>
Date<\/td>February 22 and 23, 2025<\/td><\/tr>
Location<\/td>Carlsbad, California<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

Wikipedia Description: NGC 4395 is a nearby low surface brightness spiral galaxy located about 14 million light-years (or 4.3 Mpc) from Earth in the constellation Canes Venatici.[1] The nucleus of NGC 4395 is active and the galaxy is classified as a Seyfert Type I known for its very low-mass supermassive black hole.[4] Physical characteristics NGC […]<\/p>\n","protected":false},"author":2,"featured_media":545,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-697","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/posts\/697","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/comments?post=697"}],"version-history":[{"count":5,"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/posts\/697\/revisions"}],"predecessor-version":[{"id":713,"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/posts\/697\/revisions\/713"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/media\/545"}],"wp:attachment":[{"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/media?parent=697"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/categories?post=697"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lonepeak.space\/index.php\/wp-json\/wp\/v2\/tags?post=697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}