Hi-Ho! Astronomers find cluster of seven dwarf galaxies with 'Frankenstein' telescope - and say they could shed new light on dark matter

• Previously unseen galaxies may yield important insights into dark matter and galaxy evolution
• Possibly signaling the discovery of a new class of objects in space
• discovery made with new type of 'Frankenstein' telescope built by stitching together telephoto lenses.
  

By Mark Prigg

Published: 18:58 EDT, 10 July 2014 | Updated: 20:34 EDT, 10 July 2014

They are the seven dwarf galaxies - and they could shed new light on dark matter.

Researchers this week began experimenting with a new type of 'Frankenstein' telescope made by stitching together telephoto lenses.

They almost instantly spotted the seven celestial surprises while probing a nearby spiral galaxy.

spot the seen dwarves: This image shows the field of view from the Dragonfly Telephoto Array, centered on M101. Inset images highlight the seven newly discovered galaxies.

The previously unseen galaxies may yield important insights into dark matter and galaxy evolution, while possibly signaling the discovery of a new class of objects in space, researchers said.

For now, scientists know they have found a septuplet of new galaxies that were previously overlooked because of their diffuse nature: The ghostly galaxies emerged from the night sky as the team obtained the first observations from the 'homemade' telescope.

The discovery came quickly, in a relatively small section of sky.

'We got an exciting result in our first images,' said Allison Merritt, a Yale graduate student and lead author of a paper about the discovery in The Astrophysical Journal Letters.

'It was very exciting. It speaks to the quality of the telescope.'

Pieter van Dokkum, chair of Yale’s astronomy department, designed the robotic telescope with University of Toronto astronomer Roberto Abraham.

Their Dragonfly Telephoto Array uses eight telephoto lenses with special coatings that suppress internally scattered light.

This makes the telescope uniquely adept at detecting the very diffuse, low surface brightness of the newly discovered galaxies.

'These are the same kind of lenses that are used in sporting events like the World Cup.

'We decided to point them upward instead,' van Dokkum said.

Yale astronomers used a new telescope, the Dragonfly Telephoto Array, to detect the diffuse light of the new galaxies.

He and Abraham built the compact, oven-sized telescope in 2012 at New Mexico Skies, an observatory in Mayhill, N.M.

The telescope was named Dragonfly because the lenses resemble the compound eye of an insect.

'We knew there was a whole set of science questions that could be answered if we could see diffuse objects in the sky,' van Dokkum said.

In addition to discovering new galaxies, the team is looking for debris from long-ago galaxy collisions.

'It’s a new domain. We’re exploring a region of parameter space that had not been explored before,' van Dokkum said.

The Yale scientists will tackle a key question next: Are these seven newly found objects dwarf galaxies orbiting around the M101 spiral galaxy, or are they located much closer or farther away, and just by chance are visible in the same direction as M101?

If it’s the latter, Merritt said, these objects represent something entirely different.

'There are predictions from galaxy formation theory about the need for a population of very diffuse, isolated galaxies in the universe,' Merritt said.

'It may be that these seven galaxies are the tip of the iceberg, and there are thousands of them in the sky that we haven’t detected yet.'

Merritt stressed that until they collect more data and determine the distances to the objects, researchers won’t know their true nature.

But the possibilities are intriguing enough that the team has been granted the opportunity to use the Hubble Space Telescope for further study.

'I’m confident that some of them will turn out to be a new class of objects,' van Dokkum said. 'I’d be surprised if all seven of them are satellites of M101.'