* Astronomy

Members Login
Username 
 
Password 
    Remember Me  
Post Info
TOPIC: Messier 82


L

Posts: 131433
Date:
RE: Messier 82
Permalink  
 


New Images of Starburst Galaxy M 82 Reveal Multiple Sources of Its Superwind

The Subaru Telescope, fitted with its instrument COMICS (Cooled Mid-Infrared Camera and Spectrometer), has produced a new image of the interior of the famous starburst galaxy Messier 82 (M 82) that reveals young star clusters as well as the sources of its superwind in spectacular detail. The ultra-sharp image contributes to our understanding of this complex, young galaxy by showing that M 82's galactic windstorms emanate from many sites rather than from any single cluster of stars.
Read more

__________________


L

Posts: 131433
Date:
The Cigar Galaxy
Permalink  
 


M82 is an irregular prototype starburst galaxy, whose centre is believed to be experiencing an episode of intense star formation. The red glow is from a superwind of ionised hydrogen gas, expanding out from the centre as a result of the combined winds of many individual stars.
Read more

__________________


L

Posts: 131433
Date:
RE: Messier 82
Permalink  
 


Starburst Galaxy M82
Composite image of the nearby starburst galaxy M82

This composite image of the nearby starburst galaxy M82 shows Chandra X-ray Observatory data in blue, optical data from the Hubble Space Telescope in green and orange, and infrared data from the Spitzer Space Telescope in red. The pullout is a Chandra image that shows the central region of the galaxy and contains two bright X-ray sources -- identified in a labeled version -- of special interest.

Source

__________________


L

Posts: 131433
Date:
Permalink  
 

Mysterious radio waves emitted from nearby galaxy

There is something strange in the cosmic neighbourhood. An unknown object in the nearby galaxy M82 has started sending out radio waves, and the emission does not look like anything seen anywhere in the universe before.
Read more

__________________


L

Posts: 131433
Date:
Permalink  
 

Mystery object in Starburst Galaxy M82 possible micro-quasar

Radio astronomers at the University of Manchester's Jodrell Bank Observatory have discovered a strange new object in a nearby galaxy. The object, which appeared very suddenly in radio wavelengths and shows no signs of going away, does not appear to be like anything that has been seen in the Milky Way. Dr Tom Muxlow will present the discovery at the National Astronomy Meeting in Glasgow on Wednesday 14th April.
The galaxy, known as M82, is 10 million light years away and is a stellar production line churning out new stars at a prodigious rate. However, many of these stars die quickly in huge explosions, with a new supernova explosion occurring every 20 to 30 years.

Read more

__________________


L

Posts: 131433
Date:
Permalink  
 

Irish astronomers have contributed to a major astronomical discovery, the first of its kind to be found. It is a hyperactive "starburst" galaxy where stars explode and others are forming rapidly. Just as importantly, its discovery may help solve the century-old mystery about the source of cosmic rays that reach us from deep space.
Read more

__________________


L

Posts: 131433
Date:
Permalink  
 

NEWFIRM Discovery of Warm Molecular Hydrogen in the Wind of M82
Using NEWFIRM on the Mayall 4-meter telescope at Kitt Peak, Veilleux, Rupke and Swaters have reported the discovery of warm H2 gas in the prototypical galactic wind of M82. They report filaments extending above and below the disk, roughly coincident with the location of the galactic wind in this galaxy. The warm H2 material is not found to be a dynamically important component of the outflow: however, a comparison between the H2 emission and the distribution of the CO emission reveals that most of the features seen in CO are detected in H2 but not the converse. Deep H2 2.12 m observations such as these represent a promising new method to study the elusive but potentially important molecular component of galactic winds. In the accompanying figure the new data are compared with published H- and PAH emission images (left) and H2-to-PAH emission ratio map in the brightest filaments.

Source

__________________


L

Posts: 131433
Date:
Permalink  
 

Dating young star clusters in starburst galaxy M82
Aimed at deciphering the secrets of archetypal starburst galaxy M82, the Gemini Multi-Object Spectrograph (GMOS) on Gemini North was employed by a team of UK- and US-based astronomers, led by Iraklis Konstantopoulos of University College London (UCL). The astronomers assembled key data for the largest sample of young extragalactic star clusters to date. M82 presents a gas, dust and stellar system that has intrigued scientists for decades due to its irregular, dusty appearance and extravagant super-galactic wind.
Konstantopoulos et al. used the Gemini spectra to derive the age of 49 clusters in the disk, nucleus and halo of the galaxy. The resulting demographics were used to investigate the starburst history of M82, thus demonstrating the usefulness of star clusters as probes of star formation in environments where stars are too faint to be observed. On this basis, the observations were compared to theoretical models of starburst evolution in M82 and simulations that studied the interaction between M82 and its massive neighbour, M81, and the consequent burst of star formation.

Read more

__________________


L

Posts: 131433
Date:
M82
Permalink  
 


Title: M82 as a Galaxy: Morphology and Stellar Content of the Disk and Halo
Authors: Y. Divakara Mayya (1), Luis Carrasco (1) ((1) INAOE, Mexico)

For decades, the nuclear starburst has taken all the limelight in M82 with very little discussion on M82 as a galaxy. The situation is changing over the last decade, with the publication of some important results on the morphology and stellar content of its disk and halo. In this review, we discuss these recent findings in the framework of M82 as a galaxy. It is known for almost half a century that M82 as a galaxy doesn't follow the trends expected for normal galaxies that had prompted the morphologists to introduce a separate morphological type under the name Irr II or amorphous. It is now being understood that the main reasons behind its apparently distinct morphological appearance are its peculiar star formation history, radial distribution of gas density and the form of the rotation curve. The disk formed almost all of its stars through a burst mode around 500 Myr ago, with the disk star formation completely quenched around 100 Myr ago. The fossil record of the disk-wide burst lies in the form of hundreds of compact star clusters, similar in mass to that of the globular clusters in the Milky Way, but an order of magnitude younger. The present star formation is restricted entirely to the central 500 pc zone, that contains more than 200 young compact star clusters. The disk contains a non-star-forming spiral arm, hidden from the optical view by a combination of extinction and high inclination to the line of sight. The halo of M82 is also unusual in its stellar content, with evidence for star formation, albeit at low levels, occurring continuously for over a gigayear. We carefully examine each of the observed abnormality to investigate the overall effect of interaction on the evolution of M82.

Read more  (551kb, PDF)

__________________


L

Posts: 131433
Date:
RE: Messier 82
Permalink  
 


Discovery of radio supernova SN 2008iz in the nearby starburst galaxy M82
An international team of radio astronomers have discovered the secret explosion of a massive star, a new supernova, in the nearby galaxy M82. Despite being the closest supernovae discovered in the last five years, the explosion is exclusively detectable at radio wavelengths since the dense gas and dust surrounding the exploding star leave it invisible in other wavebands. Without the obscuration, this explosion would have been visible even with amateur telescopes. The results are published in this week's release of Astronomy & Astrophysics Letters.

Read more

__________________
«First  <  1 2 3  >  Last»  | Page of 3  sorted by
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard