globular clusters: generalVelocity dispersion measurements are presented for luminous GCs in NGC 5128 derived from high-res. UVES spectra. The measurements are made with the pPXF code that parametrically recovers line-of-sight velocity dispersions. Combining the measured velocity dispersions with surface...
The following image was taken at a mid-range focal length of 135mm. From this view, you can start to see individual deep-sky objects like globular clusters and nebulae appear. You can also distinguish the areas of dark interstellar dust blocking bright starlight. A close-up of the Milky W...
These are estimated to be ~1.5 billion years old. Get back to me when they are at last 9 billion years old as to whether there is ANY evidence of star formation then. As I have noted before, they provide fertile ground for delineating globulars and open clusters as studies develop. ...
Globular Clusters A few hundred of these are scattered above and below the disk. The stars here are much older than those in the galactic disk. Halo A halo is a large, dim, region that surrounds the entire galaxy. It's made of hot gas and possibly dark matter. Gravity All...
To determine the luminosities of the globular clusters, Shapely measured the periods of brightness of the RR Lyrae stars in the clusters. Once he knew the luminosities, he could calculate their distances from Earth. How Many Stars Are in the Milky Way? It's complicated, but you can use Newt...
interstellar medium, while H II regions are among its gaseous constituents. Planetary nebulae are circumstellar in nature, the result of a dying star ejecting its outer envelope. Globular clusters fall in the stellar systems family, while those nebulosities that are extragalactic go into galaxy sub...
For other deep sky objects, globular clusters should be on your list. At the moment, there are only a few visible (M79 and NGC 2419 come to mind) but they are much more abundant in the summer. M3, M5 (my personal favorite), M13 and M92 are all showpieces. ...
All the plants which form clusters may be reproduced by removing offsets. Otherwise they must be raised from seed. Agavaceae This last family dealt with here, includes yuccas, sansevierias and agaves. It is the agaves that interest the grower of succulents. These are rosette-shaped plants with...
摘要: We summarize the results presented in Krause et al. (2012a, K12) on the impact of supernova-driven shells and dark-remnant accretion on gas expulsion in globular cluster infancy.关键词:Globular clusters ISM: bubbles 会议名称: IAU General Assembly ...
What are the physics of star formation as a function of mass, stage of evolution, and location in the Milky Way? GLIMPSE uses an automatic cluster-finding computer program developed by astronomers at Boston University. This software searches large areas of sky to find clusters difficult for the...