Atlas of Peculiar Galaxies
This section includes my own selection of part of the APR Atlas, a collection made by Halton Arp of peculiar or unusual galaxies. The atlas is the result of a compilation of photos taken of 338 galaxies made between 1961 and 1966 with the Palomar telescope of 200" and Schmidt of 48". I am especially interested in photographs of interaction between galaxies or grouping them. They are not very easy objects for an amateur telescope but they have the appeal of the difficulty of the photo and the wealth of information of the captured images. As no artistic photos are intended, they are made in monochrome and the inverted photos are shown, as this makes it easier to improve the visual contrast and highlight the details. I start this work in June 2016, with a first picture of the intergalactic bridge between the galaxies NGC 5216 and NGC 5218, with the number 104 of the catalog oArp.
Arp 104, Keenan System
The photo is taken between June 22 and 23, 2016 with a C11 F6.3 with clear filter result of the stacking of 30 shots of 600s on camera ST8XME with mount EQ8 and guided OFF AXIS with Lodestar camera.
In the upper part, the spiral galaxy NGC 5216 and in the lower part the globular galaxy NGC 5218, both connected by a filament 22,000 light-years long.
Both galaxies were included with the name of Arp 104 in the Catalog of Peculiar Galaxies of Halton Arp. The set is also known as the Keenan System.
The set was originally discovered by Friedrich Wilhelm Herschel in 1790 and later studied by Edwin Hubble in 1926. But it was not until 1935 when Keenan noticed that this double galactic mystery seemed to be connected by "luminous debris"
The pair is 17.3 million light-years away from us.
Arp 188, Tadpole Galaxy
The picture is taken between June 30 and July 1, 2016 with a C11 F6.3 with clear filter result of the grouping of 38 shots of 600s on camera ST8XME with mount EQ8 and guided OFF AXIS with Lodestar camera.