Celestial hemisphere:  Northern  ·  Constellation: Boötes (Boo)  ·  Contains:  NGC 5527  ·  NGC 5529
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Rarely-imaged Boötes "needle" galaxy NGC 5529 & friends, Howard Trottier
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Rarely-imaged Boötes "needle" galaxy NGC 5529 & friends

Getting plate-solving status, please wait...
Rarely-imaged Boötes "needle" galaxy NGC 5529 & friends, Howard Trottier
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Rarely-imaged Boötes "needle" galaxy NGC 5529 & friends

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Description

NGC 5529 is a striking edge-on "needle" galaxy in Boötes that, surprisingly, has rarely been imaged, with fewer than 40 Astrobin posts to date. The image of NGC 5529 above, which also contains a number of other interesting (and not so interesting!) galaxies, spans about 29' to a side, at a plate scale of about 0.47"/pixel, and is the result of 20+ hours of integration, split roughly equally between luminance and RGB colour, and acquired over the course of six nights in the latter half of May. 

Prominent features in NGC 5529 include its dust lane, a boxy/peanut-shaped bulge with a subtle yet eye-catching "X" structure (as if to bullseye the nucleus!), and a warped disk with vivid blue star-forming regions at the tips. It lies at a distance of about 140 million light-years, and is very large as spiral galaxies go, with a physical diameter of about 250,000 light years. NGC 5529 is the dominant member of a cluster of at least 17 galaxies, four of which are in my FOV; the most prominent of those is just above the left tip of NGC 5529 and is catalogued as MCG +06-31-085a, which has been been characterized as a blue compact dwarf (BCD) galaxy  [**]. 

Among the many smaller galaxies sprinkled around the FOV,  there is a dramatically distorted spiral towards the centre-right edge of the frame, PGC 2076843, which has a very striking tidal stream with a tell-tale blue colour, indicative of recent star formation, while several much fainter streams also show up in the image; the galaxy is documented in this study of a large sample of galaxies with tidal streams. 

[**] There is some confusion regarding the cataloguing of the BCD companion associated with NGC 5529, and also of a face-on barred spiral (unrelated to NGC 5529) that lies just above the bottom-left corner of the frame. SIMBAD includes the identifier NGC 5527 for the BCD, and for the barred spiral it includes NGC 5524. However, the NASA/IPAC Extragalactic Database (and the plate solve for my image) identifies NGC 5527 as the barred spiral, and states in this entry that the identification of NGC 5524 is uncertain, but in another entry (see the "Essential note") identifies it as a double star ... confused yet?!

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Rarely-imaged Boötes "needle" galaxy NGC 5529 & friends, Howard Trottier