A lost 'Dementor' in Lacerta (Louis Leroux)

A lost 'Dementor' in Lacerta

🇫🇷 Un "Détraqueur" perdu dans la constellation du Lézard...
🇬🇧 A lost 'Dementor' in Lacerta...

On change de type de cible avec ce nouveau projet avec la team "Altaïr of Atlas Astrophotographers" qui s'articule autour de la galaxie NGC7223. Cette zone se trouve en bordure de Voie Lactée, on y retrouve une grande variété d'objets : beaucoup de gaz sombre, des IFN, des nébulosités d'hydrogène qui tapissent le fond de ciel et un nombre de galaxies impressionnant qui se trouvent encore plus loin dans l'immensité de l'univers.

Ce champ a été réalisé en 2 tuiles afin d'avoir la branche principale de ce nuage moléculaire dans son entièreté passant en diagonale de l'image. A son extrémité, avec une couleur de gaz brune, se trouve une zone intense ou se forment de nouvelles étoiles. De l'hydrogène ténu est présent un peu partout en arrière plan (en rouge) et révèle toute sa splendeur après une trentaine d'heures de pose sous le ciel limpide de l'Atlas au Maroc.

We're switching targets with this new project by the ‘Altaïr of Atlas Astrophotographers’ team, which focuses on the galaxy NGC7223 and its surroundings. This zone is located on the edge of the Milky Way and contains a large variety of objects: lots of dark dust, IFNs, hydrogen nebulosities covering the background and an impressive number of galaxies further away in the universe.

This field has been made in 2 tiles in order to have the main molecular cloud in its entirety passing diagonally across the image. At its extremity, with a brown gas color, is an intense zone where new stars are born. Faint hydrogen is present everywhere in the background (in red) and reveals all its beauty after around thirty hours of exposure under the clear sky of the Atlas Mountains in Morocco.

NGC7223, c'est cette galaxie particulièrement belle et qui saute aux yeux au premiers abords. C'est une galaxie spirale barrée située dans la constellation du Lézard qui se situe à environ 200 millions d'a.l de nous. NGC7223 a été découverte par l'astronome germano-britannique William Herschel en 1790. La classe de luminosité de NGC7223 est II-III et elle présente une large raie HI.

Selon le professeur Seligman, NGC7223 forme probablement une paire de galaxies en interaction gravitationnelle avec LEDA 2148033 (en bas à droite de NGC7223 sur l'image). Par ailleurs, selon la base de données Simbad, LEDA 214803 est une galaxie candidate au titre de galaxie active.

Selon A. M. Garcia, NGC7223 est membre d'un groupe de galaxies qui porte son nom. Le groupe de NGC7223 renferme au moins 6 galaxies auxquelles on peut dorénavant ajouter LEDA 214803, soit un total de 7. Les autres galaxies du groupe sont PGC 67977, 67985, 68169, 68171 et 68178.

Plus récemment, le groupe de galaxies s'articulant autour de NGC7223 est passé de 7 à 18 galaxies (dont beaucoup sont visibles sur ci-dessous) et possède désormais un nom officiel : le groupe LDCE 1503.

NGC7223 is a particularly beautiful galaxy that is immediately obvious to the eyes. It's a barred spiral galaxy located in the Lacerta constellation, around 200 million light-years away. NGC7223 was discovered by the German-British astronomer William Herschel in 1790. NGC7223's luminosity class is II-III and it has a large HI band.

According to Professor Seligman, NGC7223 probably forms a pair of galaxies in gravitational interaction with LEDA 2148033 (bottom right of NGC7223 in the image). Furthermore, according to the Simbad database, LEDA 214803 is a candidate galaxy for the title of active galaxy.

According to A. M. Garcia, NGC7223 is a member of a group of galaxies that bears its name. The NGC7223 group contains at least 6 galaxies, to which we can now add LEDA 214803, making a total of 7. The other galaxies in the group are PGC 67977, 67985, 68169, 68171 and 68178.

More recently, the group of galaxies around NGC7223 has grown from 7 to 18 galaxies (many of which can be seen below) and now has an official name : LDCE 1503 group.

Dès que nous avons vu notre image finale, notre imagination s'est mise en route et n'a pas mis longtemps à apercevoir une forme qui sera familière à tous les fans de la saga Harry Potter : un détraqueur ! La forme de la silhouette, la tête, le bas du corps et le brouillard qui l'entoure : tout coïncide pour que nous appelions ce bras de gaz sombre de la Voie Lactée (LBN420), qui ne porte pas de nom commun, la nébuleuse du Détraqueur...

Immediately when we saw our final image, our imaginations took over and it wasn't long before we spotted a shape that will be familiar to all fans of the Harry Potter saga : a dementor ! The shape of the silhouette, the head, the lower part of the body and the fog surrounding it : all coincide in calling this arm of molecular clouds in the Milky Way (LBN420), which has no common name, the Dementor nebula...

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Status	Advanced success
Started	...
PixInsight job	LHCXERIQKCVRE45V1P75H3YYH8QE3NUG
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h07m27s.91
RA (top/left)	22h14m52s.59
RA (top/right)	22h15m23s.98
RA (bottom/right)	21h59m38s.56
RA (bottom/left)	21h59m55s.41

Dec (center)	+41°57′29″.8
Dec (top/left)	+40°15′49″.5
Dec (top/right)	+43°36′07″.7
Dec (bottom/right)	+43°37′17″.8
Dec (bottom/left)	+40°16′55″.2

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