Hubble sees a lonely galactic island

Aug 20, 2012
Image Credit: ESA/Hubble & NASA

(Phys.org) -- In terms of intergalactic real estate, our solar system has a plum location as part of a big, spiral galaxy, the Milky Way. Numerous, less glamorous dwarf galaxies keep the Milky Way company. Many galaxies, however, are comparatively isolated, without close neighbors. One such example is the small galaxy known as DDO 190, snapped here in a new image from the NASA/ESA Hubble Space Telescope. (“DDO" stands for the David Dunlap Observatory, now managed by the Royal Astronomical Society of Canada, where the catalog was created).

DDO 190 is classified as a dwarf irregular galaxy as it is relatively small and lacks clear structure. Older, reddish stars mostly populate DDO 190's outskirts, while some younger, bluish stars gleam in DDO 190's more crowded interior. Some pockets of ionized gas heated up by stars appear here and there, with the most noticeable one shining towards the bottom of DDO 190 in this picture. Meanwhile, a great number of distant galaxies with evident spiral, elliptical and less-defined shapes glow in the background.

DDO 190 lies around nine million light-years away from our . It is considered part of the loosely associated Messier 94 group of galaxies, not far from the Local Group of galaxies that includes the . Canadian astronomer Sidney van der Bergh was the first to record DDO 190 in 1959 as part of the DDO catalog of .

Although within the Messier 94 group, DDO 190 is on its own. The galaxy's nearest dwarf galaxy neighbor, DDO 187, is thought to be no closer than three million light-years away. In contrast, many of the Milky Way’s companion galaxies, such as the Large and Small Magellanic Clouds, reside within a fifth or so of that distance, and even the giant spiral of the Andromeda Galaxy is closer to the Milky Way than DDO 190 is to its nearest neighbor.

Hubble's Advanced Camera for Surveys captured this image in visible and infrared light. The field of view is around 3.3 by 3.3 arcminutes.

A version of this image was entered into the Hubble's Hidden Treasures Image Processing Competition by contestant Claude Cornen. Hidden Treasures is an initiative to invite astronomy enthusiasts to search the Hubble archive for stunning images that have never been seen by the general public. The competition has now closed and the results will be published soon.

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User comments : 9

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Tuxford
1 / 5 (5) Aug 20, 2012
Where's the rotation? I want rotation! Give me rotation....

http://phys.org/n...ula.html

http://phys.org/n...eas.html

The Big Chill over the The Big Bang....

http://phys.org/n...ill.html
ValeriaT
1 / 5 (6) Aug 20, 2012
IMO small galaxies without central black hole have no big reason to rotate. The rotation requires to establish axis and constrain for radiation and circulation of matter within galaxy (a "whirlpool") and without event horizon no such constrain can be formed. This galaxy is probably very old (black hole evaporated in its center already) and it contains a huge amount of "ash", i.e. the dark matter, which keeps the stars at distance even without apparent macroscopic rotation. Most of old galaxies are "dwarf", "elliptical" and similar to star clusters.
cantdrive85
1 / 5 (5) Aug 20, 2012
From the smallest particle to the largest galactic formation, a web of electrical circuitry connects and unifies all of nature, organizing galaxies, energizing stars, giving birth to planets and, on our own world, controlling weather and animating biological organisms. There are no isolated islands in an electric universe.

- David Talbott and Wallace Thornhill, Thunderbolts of the Gods.
ValeriaT
1 / 5 (1) Aug 20, 2012
IMO the galaxies cannot be electrically charged - or they would explode already, because they're composed of individual stars instead of compact matter. If they're kept together with gravity, then it's evident, the effects of charge forces between galaxies are quite negligible.
Shinichi D_
5 / 5 (7) Aug 20, 2012
No galaxies are old enough to have their central black hole to evaporate. Even a solar mass black hole would require much longer time to evaporate than the age of the universe. Rotation of elliptical and spiral galaxies is probably not caused - or not exclusively - by the central black hole. It's responsible only for a tiny portion of the mass of most galaxies.
barakn
5 / 5 (4) Aug 20, 2012
Has anyone compiled a list of Zephir's sockpuppets? The sheer number is staggering.
DarkHorse66
5 / 5 (6) Aug 21, 2012
Has anyone compiled a list of Zephir's sockpuppets? The sheer number is staggering.

Mmmm, let's see....These are the ones to come most readily to mind as having been used lately (and often without discrimination in the same thread): Bewia, Satene, Natello, ValeriaT, Sanita, mpc755 (&variations thereof) and Tclick (that one hasn't been used for a while and may even be banned). So that makes at least six(!) current alter-egos. I'm sure that the others could add to the list, both current and past. What would be the advantage of posting under so many???! I can't see one. The eerie part is that I just posted to another article about 'DID' in medical express:
http://medicalxpr...ive.html
Coincidence? Weird or what?
Best Regards, DH66
DarkHorse66
4.4 / 5 (7) Aug 21, 2012
...Zephir, Rawa1, Callipo, Origin......etc?
Cheers, DH66
yyz
3 / 5 (2) Aug 21, 2012
"Has anyone compiled a list of Zephir's sockpuppets?"

Skeptic_Heretic (who hasn't posted in a while, where'd he go?) has this list of older Zephir sockpuppets: Xaero, hodzaa, MustaI, Alizee, wiki11, slotin, Alexa, jigga, Sirinx, kaixin, rphy, sckavasallis, gravityphd, Citinex, CTD1, smk9, VK1, beelize54, undo, KwasniczJ, tamang

http://phys.org/p..._Heretic

(Note: Some of these accounts are still active. I have omitted a few that are likely other posters.)

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