* Astronomy

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


L

Posts: 131433
Date:
Cigar Galaxy
Permalink  
 


the Cigar Galaxy (Messier 82, NGC 3034) from `the kleinfriesen observatory 48'

Spoiler



__________________


L

Posts: 131433
Date:
M82 galaxy
Permalink  
 


Title: Planck view of the M82 galaxy
Author: V.G. Gurzadyan, F. De Paolis, A.A. Nucita, G. Ingrosso, A.L. Kashin, H.G. Khachatryan, S. Sargsyan, G. Yegorian, Ph. Jetzer, A. Qadir, D. Vetrugno

Planck data towards the galaxy M82 are analyzed in the 70, 100 and 143 GHz bands. A substantial north-south and East-West temperature asymmetry is found, extending up to 1 degree from the galactic center. Being almost frequency-independent, these temperature asymmetries are indicative of a Doppler-induced effect regarding the line-of-sight dynamics on the halo scale, the ejections from the galactic center and, possibly, even the tidal interaction with M81 galaxy. The temperature asymmetry thus acts as a model-independent tool to reveal the bulk dynamics in nearby edge-on spiral galaxies, like the Sunyaev-Zeldovich effect for clusters of galaxies.

Read more (616kb, PDF)



__________________


L

Posts: 131433
Date:
RE: Messier 82
Permalink  
 


LOFAR's record-sharp image gives astronomers a new view of galaxy M 82

An international team of astronomers, including ASTRON scientists* from ASTRON, used the giant radio telescope LOFAR to create the sharpest astronomical image ever taken at very long radio wavelengths. Made by observing simultaneously from four countries, the image shows the glowing centre of the galaxy Messier 82 - and many bright remnants of supernova explosions.
Read more



__________________


L

Posts: 131433
Date:
Permalink  
 

NASA's RXTE Satellite Decodes the Rhythm of an Unusual Black Hole

Astronomers have uncovered rhythmic pulsations from a rare type of black hole 12 million light-years away by sifting through archival data from NASA's Rossi X-ray Timing Explorer (RXTE) satellite.
The signals have helped astronomers identify an unusual midsize black hole called M82 X-1, which is the brightest X-ray source in a galaxy known as Messier 82. Most black holes formed by dying stars are modestly-sized, measuring up to around 25 times the mass of our sun. And most large galaxies harbor monster, or supermassive, black holes that contain tens of thousands of times more mass.

Read more



__________________


L

Posts: 131433
Date:
NGC 3034
Permalink  
 


NGC 3034 (also Cigar Galaxy or Messier 82) is a magnitude +8.6 starburst galaxy located 11.4-12.4 million light years away in the constellation Ursa Major.

The galaxy was discovered by German astronomer Johann Elert Bode at the Berlin observatory on the 31st December 1774.

The galaxy hosted Supernova 2014J

M82 is being physically affected by its larger neighbour, the spiral M81. Tidal forces caused by gravity have deformed M82, a process that started about 100 million years ago. This interaction has caused star formation to increase tenfold compared to "normal" galaxies.
M82 has undergone at least one tidal encounter with M81 resulting in a large amount of gas being funnelled into the galaxy's core over the last 200 Myr.

Read more

Right Ascension 09h 55m 54s, Declination +69 40' 59"



__________________


L

Posts: 131433
Date:
RE: Messier 82
Permalink  
 


Title: On the soft X-ray emission of M82
Authors: Jiren Liu, Q. Daniel Wang, Shude Mao

We present a spatial analysis of the soft X-ray and H{\alpha} emissions from the outflow of the starburst galaxy M82. We find that the two emissions are tightly correlated on various scales. The O VII triplet of M82, as resolved by X-ray grating observations of XMM-Newton, is dominated by the forbidden line, inconsistent with the thermal prediction. The O VII triplet also shows some spatial variations. We discuss three possible explanations for the observed O VII triplet, including the charge exchange at interfaces between the hot outflow and neutral cool gas, a collisional non-equilibrium-ionisation recombining plasma, and resonance scattering.

Read more (1937kb, PDF)



__________________


L

Posts: 131433
Date:
Permalink  
 

Title: AKARI near-infrared spectroscopy of the aromatic and aliphatic hydrocarbon emission features in the galactic superwind of M 82
Authors: M. Yamagishi, H. Kaneda, D. Ishihara, T. Kondo, T. Onaka, T. Suzuki, Y. C. Minh

Aims. We investigate the properties of hydrocarbon grains in the galactic superwind of M 82.
Methods. With AKARI, we performed near-infrared (2.5 - 4.5 um) spectroscopic observations of 34 regions in M 82 including its northern and southern halos.
Results. Many of the spectra show strong emission at 3.3 um due to polycyclic aromatic hydrocarbons (PAHs) and relatively weak features at 3.4 - 3.6 um due to aliphatic hydrocarbons. In particular, we clearly detect the PAH 3.3 um emission and the 3.4 - 3.6 um features in halo regions, which are located at a distance of 2 kpc away from the galactic center. We find that the ratios of the 3.4 - 3.6 um features to the 3.3 um feature intensity significantly increase with distance from the galactic center, while the ratios of the 3.3 um feature to the AKARI 7 um band intensity do not.
Conclusions. Our results clearly confirm the presence of small PAHs even in a harsh environment of the halo of M 82. The results also reveal that the aliphatic hydrocarbons emitting the 3.4 - 3.6 um features are unusually abundant in the halo, suggesting that small carbonaceous grains are produced by shattering of larger grains in the galactic superwind.

Read more (230kb, PDF)



__________________


L

Posts: 131433
Date:
Permalink  
 

Messier 82 - from kleinfriesen observatory


Credit Ramonkfo



__________________


L

Posts: 131433
Date:
Permalink  
 

Title: Measurement of the Mass and Stellar Population Distribution in M82 with the LBT
Authors: Johnny P. Greco, Paul Martini, Todd A. Thompson

We present a K-band spectroscopic study of the stellar and gas kinematics, mass distribution, and stellar populations of the archetypical starburst M82. We used the CO stellar absorption bandhead at 2.29 {\mu}m (CO_2.29) to measure the rotation curve out to nearly 4 kpc radius on both the eastern and western sides of the galaxy. In contrast with the nearly Keplerian gas dynamics suggested by previous measurements of HI and CO emission from the ISM, which imply a truncation in M82's dark matter halo, our data show that the rotation curve is in fact flat on 1 - 4 kpc scales. The kinematics of the Br{\gamma}, H2, and HeI emission lines are consistent with, although characterized by slightly higher velocities than, the stellar kinematics. We derived M82's mass distribution from our stellar kinematic measurements and estimate its total dynamical mass is ~10^10 solar masses. We measured the equivalent width of CO_2.29 (W_2.29) as a function of distance from the center of the galaxy to investigate the spatial extent of the red supergiant (RSG) population. The variation in W_2.29 with radius clearly shows that RSGs dominate the light inside 500 pc radius. M82's famous superwind is likely launched from this region, where we estimate the enclosed mass is <= 2 z 10^9 solar masses.

Read more (572kb, PDF)



__________________


L

Posts: 131433
Date:
Permalink  
 

Bristol scientists gain new view of starburst galaxy thanks to Japanese telescope

A new image of the interior of the famous starburst galaxy Messier 82 (M82) that reveals young star clusters as well as the sources of its superwind, has been produced by an international team of scientists, including physicists from the University of Bristol.
Read more

__________________
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