Subscribe to our free daily newsletters
  Space Travel News  




Subscribe to our free daily newsletters



SPACE SCOPES
A Galactic Rose Highlights Hubble's 21st Anniversary

This image of a pair of interacting galaxies called Arp 273 was released to celebrate the 21st anniversary of the launch of the NASA/ESA Hubble Space Telescope. The distorted shape of the larger of the two galaxies shows signs of tidal interactions with the smaller of the two. It is thought that the smaller galaxy has actually passed through the larger one. For a larger version of this image please go here. Copyright: NASA, ESA and the Hubble Heritage Team (STScI/AURA)
by Staff Writers
Paris, France (ESA) Apr 21, 2011
In celebration of the 21st anniversary of the Hubble Space Telescope's deployment into space, astronomers pointed Hubble at an especially photogenic group of interacting galaxies called Arp 273.

This image, taken by the NASA/ESA Hubble Space Telescope, shows a group of interacting galaxies called Arp 273. The larger of the spiral galaxies, known as UGC 1810, has a disc that is tidally distorted into a rose-like shape by the gravitational pull of the companion galaxy below it, known as UGC 1813. The swathe of blue jewels across the top is the combined light from clusters of intensely bright and hot young blue stars.

These massive stars glow fiercely in ultraviolet light.

The smaller, nearly edge-on companion shows distinct signs of intense star formation at its nucleus, perhaps triggered by the encounter with the companion galaxy.

A series of uncommon spiral patterns in the large galaxy are a telltale sign of interaction. The large, outer arm appears partially as a ring, a feature that is seen when interacting galaxies actually pass through one another.

This suggests that the smaller companion actually dived deeply, but off-centre, through UGC 1810. The inner set of spiral arms is highly warped out of the plane, with one of the arms going behind the bulge and coming back out the other side. How these two spiral patterns connect is still not precisely known.

A possible mini-spiral may be visible in the spiral arms of UGC 1810 to the upper right. It is noticeable how the outermost spiral arm changes character as it passes this third galaxy, from smooth with lots of old stars (reddish in colour) on one side, to clumpy and extremely blue on the other.

The fairly regular spacing of the blue star-forming knots fits with what is seen in the spiral arms of other galaxies and can be predicted from the known instabilities in the gas contained within the arm.

The larger galaxy in the UGC 1810-UGC 1813 pair has a mass that is about five times that of the smaller galaxy. In unequal pairs such as this, the relatively rapid passage of a companion galaxy produces the lopsided or asymmetric structure in the main spiral. Also in such encounters, the starburst activity typically begins earlier in the minor galaxy than in the major galaxy.

These effects could be due to the fact that the smaller galaxies have consumed less of the gas present in their nucleus, from which new stars are born.

Arp 273 lies in the constellation Andromeda and is roughly 300 million light-years away from Earth. The image shows a tenuous tidal bridge of material between the two galaxies that are separated by tens of thousands of light-years from each other.

The interaction was imaged on 17 December 2010, with Hubble's Wide Field Camera 3 (WFC3).

This Hubble image is a composite of data taken with three separate filters on WFC3 that allow a broad range of wavelengths covering the ultraviolet, blue, and red portions of the spectrum.



Share This Article With Planet Earth
del.icio.usdel.icio.us DiggDigg RedditReddit
YahooMyWebYahooMyWeb GoogleGoogle FacebookFacebook



Related Links
Hubble Space Telescope
Space Telescope News and Technology at Skynightly.com



Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News


SPACE SCOPES
Hubble Shows New Image of Spiral Galaxy NGC 2841
Garching, Germany (ESO) Feb 18, 2011
The galaxy NGC 2841 - shown here in this NASA/ESA Hubble Space Telescope image, taken with the space observatory's newest instrument, the Wide Field Camera 3 - currently has a relatively low star formation rate compared to other spirals. It is one of several nearby galaxies that have been specifically chosen for a new study in which a pick 'n' mix of different stellar nursery environments ... read more







SPACE SCOPES
Ariane Ariane 5 enjoys second successful launch for 2011

Ariane rocket launches two telecoms satellites

Ariane 5 Cleared For Launch With Yahsat Y1A And Intelsat New Dawn

SpaceX aims to put man on Mars in 10-20 years

SPACE SCOPES
NASA Orbiter Reveals Big Changes in Mars' Atmosphere

Dry ice find hints Mars was a wetter place: study

A Tale Of Two Deserts

Mars Rover's 'Gagarin' Moment Applauded Exploration

SPACE SCOPES
India Eyeing Collaboration With JPL In 2016 NASA Lunar Mission

BRP To Contribute To Canadian Moon And Mars Exploration Programs

Naveen Jain Co-Founder And Chairman Of Moon Express

Project Morpheus To Begin Testing At NASA's Johnson Space Center

SPACE SCOPES
Carbon monoxide detected around Pluto

The PI's Perspective: Pinch Me!

Later, Uranus: New Horizons Passes Another Planetary Milestone

Can WISE Find The Hypothetical Tyche In Distant Oort Cloud

SPACE SCOPES
Tuning Into ExoPlanet Radio

Radio signals could 'tag' distant planets

The Shocking Environment Of Hot Jupiters

Titan-Like Exoplanets

SPACE SCOPES
Russia may launch light Soyuz carrier rocket by 2012

Weak Russian component downed Indian rocket Says Ex-ISRO chief

NASA awards $270 million in spaceship contracts

No Fleet Future For X-37B

SPACE SCOPES
Asia's star ever brighter in space

What Future for Chang'e-2

China setting up new rocket production base

China's Tiangong-1 To Be Launched By Modified Long March II-F Rocket

SPACE SCOPES
Fast-Rotating Asteroid Winks For Astronomer's Camera

Cold Asteroids May Have A Soft Heart

WISE Mission Spots 'Horseshoe' Asteroid

WISE Mission Spots Horseshoe Asteroid


The content herein, unless otherwise known to be public domain, are Copyright 1995-2010 - SpaceDaily. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement