https://arciereceleste.it/en/tags/galaxies/Recent content in Galaxies on L'Arciere CelesteHugoen-USTue, 30 May 2017 11:44:40 +0000https://arciereceleste.it/en/tutorial/enhance-galaxy-ha/Sun, 12 Apr 2015 19:59:11 +0000https://arciereceleste.it/en/tutorial/enhance-galaxy-ha/<p><a href="https://arciereceleste.it/tutorial/enhance-galaxy-ha-ita/">Leggilo in italiano</a></p> <p>Galaxies are among the most fascinating objects to be photographed, their light emission comes mainly from the stars so it has a continuum spectrum.</p> <p>For this reason, the primary capture method with CCD cameras is through RGB broadbandfilters ot get true-color images.</p> <p>Some spiral galaxies, however, are very rich in HII regions, areas in which star formation is particularly active, and emit mainly hydrogen spectrum whose main emission line in the visible, called Hα (H alpha), is in red at 656.28 nm.</p>https://arciereceleste.it/en/tutorial/videotutorial/Tue, 30 May 2017 11:44:40 +0000https://arciereceleste.it/en/tutorial/videotutorial/<blockquote> <p><em>Page translated by Claude — switch to Italian to read the original article.</em></p> </blockquote> <p>During the &ldquo;brainstorming&rdquo; session of the PixInsight Workshop at the Torre del Sole on May 27 and 28, 2017, I was asked for advice on how to process an image of NGC 891</p> <p>The image is an LRGB capture taken from the city sky of Manerbio by my friend Alberto Crescenti.</p>