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Posts Tagged ‘Galaxies’

Hubble captures stunning gravitational interaction between a trio of galaxies

05 Aug

NASA has published a stunning image captured by the Hubble Space Telescope that shows a ‘three-way gravitational tug-of-war between interacting galaxies.’ The galaxies in the show are in system Arp 195, a system featured in the Atlas of Peculiar Galaxies, a list of the ‘weirder and more wonderful galaxies in the universe.’

Arp 195, otherwise known as UGC 4653, is a galaxy with material ejected from nuclei. It’s one of 15 Arp-numbered galaxies with this characteristic. All but one of these galaxies are interacting or have recently interacted with other celestial objects. The trademark tidal features of the galaxies, including Arp 195, appear to be the result of gravitational interactions.

Credit: ESA/Hubble & NASA, J. Dalcanton. Click to enlarge.

Hubble’s new sighting is in the Lynx constellation, about 747 million light-years from Earth. It’s fantastic to see new images from Hubble, as the venerable space telescope suffered significant downtime following a computer glitch earlier this summer. Hubble recently returned to service and celebrated by publishing a pair of stunning monochromatic images last month.

‘These images, from a program led by Julianne Dalcanton of the University of Washington in Seattle, demonstrate Hubble’s return to full science operations. [Left] ARP-MADORE2115-273 is a rarely observed example of a pair of interacting galaxies in the southern hemisphere. [Right] ARP-MADORE0002-503 is a large spiral galaxy with unusual, extended spiral arms. While most disk galaxies have an even number of spiral arms, this one has three.’ Text and image credit: Science: NASA, ESA, STScI, Julianne Dalcanton (UW) Image processing: Alyssa Pagan (STScI). Click to enlarge.

The hiatus aside, Hubble’s observational time is valuable. NASA writes, ‘Observing time with Hubble is extremely valuable, so astronomers don’t want to waste a second. The schedule for Hubble observations is calculated using a computer algorithm which allows the spacecraft to occasionally gather bonus snapshots of data between longer observations. This image of the clashing triplet of galaxies in Arp 195 is one such snapshot. Extra observations such as these do more than provide spectacular images – they also help to identify promising targets to follow up with using telescopes such as the upcoming NASA/ESA/CSA James Webb Space Telescope.’

Hubble offers a unique look into distant space, and it’s great to see that the telescope is working well following its concerning issue. If you’d like to see more of what Hubble is up to, you can check out an image gallery here.

Articles: Digital Photography Review (dpreview.com)

 
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An array of Canon 400mm F2.8L II lenses is helping astronomers discover new galaxies

27 Oct
The Dragonfly Telephoto Array. Photo by Pieter van Dokkum

When Astronomer Pieter van Dokkum was looking for ways to study galaxies, he turned to the equipment he was familiar with as an amateur photographer. Thanks in part to some advanced optical coatings, he and his research team have been able to discover previously unseen galaxies.

In 2011, van Dokkum and fellow professor and astronomer Roberto Abraham, were discussing ways to find a way to get a better look into the very diffuse cosmic light that’s scattered by traditional telescopes like Hubble. Van Dokkum’s thoughts turned to his consumer imaging equipment, and some claims Canon was making about its then-recently-released 400mm F2.8L II. 

Introduced in August the previous year, the 400mm F2.8L II offers what Canon calls ‘a SubWavelength Structure Coating (SWC), which uses microscopic cone-shaped structures smaller than a wavelength of visible light’ to reduce internal reflections and scattered light. This kind of coating would theoretically help collect enough light to study galaxies with low ‘surface brightness’, and sure enough, it did. Says van Dokkum: ‘We compared their performance to those of the best reflecting telescopes, and found that they produce almost an order of magnitude better suppression of the wings of the point spread function – probably in part because of the SWC coatings.’ In short, the 400mm F2.8L II fit the bill.

More lenses were acquired and the Dragonfly Telephoto Array was born (clustering lenses allows researchers to increase the effective aperture of the system). Van Dokkum and Abraham started with eight lenses, and now operate two mounts with a total of 48 lenses.

Custom connectors, as well as off-the-shelf components like Intel Compute Sticks help drive Dragonfly. Photo by Pieter van Dokkum

You won’t find a Canon EOS 5DSR behind anywhere on the array, though. Each lens is attached to its own science-grade 8MP CCD camera, and has a custom astronomical filter slotted in. There’s a custom-built connector between each camera and the lens that can drive focus, and an Intel Compute Stick attached to each camera takes care of data recording and some processing. It’s all controlled by a central computer that can carry out commands like ‘auto-observe Mars’ and ‘expose 900 seconds’. 

The array has helped examine much-observed heavenly bodies like the Coma Cluster, where they’ve been able to identify what the research team has dubbed ‘ultradiffuse galaxies.’ They continue to discover more of these galaxies with the help of Dragonfly, and aim to keep learning about their variety and formation. 

Articles: Digital Photography Review (dpreview.com)

 
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Space in Miniature: Tilt-Shift Effect Shrinks Galaxies

14 Jan

[ By Steph in Art & Photography & Video. ]

Tilt Shift Space Photos 1

The scope of all that exists beyond our own planet is so large, it’s mind-boggling to contemplate. Yet a simple Photoshop trick can seemingly reduce shots of outer space, including those taken by powerful Hubble telescopes, to miniature scenes.

Tilt Shift Space Photos 5

Reddit user TheScienceLlama took a bunch of space imagery from NASA and ESA and transformed it with the Tilt-Shift filter in Photoshop, including the Horsehead Nebula, Crab Nebula, Meathook Galaxy, Thor’s Helmet Nebula and Andromeda Galaxy.

Tilt Shift Space Photos 3

Tilt Shift Space Photos 2

The tilt-shift effect blurs the top and bottom of an image to mimic a shallow depth of field, making it seem as if life-sized scenes are actually miniatures.

Tilt Shift Space Photos 6

The effect is especially effective on urban scenes, making planes, city buses, cruise ships and people look  like toys.

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[ By Steph in Art & Photography & Video. ]

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