Why in News ?
Mystery of dwarf galaxy traced by Aryabhatta Research Institute of Observational Sciences (ARIES) astronomers of massive star formation.
What are the findings ?
Mystery of dwarf galaxy traced by ARIES are :
- The disturbed hydrogen distribution in these galaxies and also in recent collisions between two galaxies.
- The 1420.40 MHz images of several intense star-forming dwarf galaxies indicated that hydrogen in these galaxies is very disturbed.
- Some hydrogen around these galaxies is also detected in forms of isolated clouds, plumes, and tails as if some other galaxy recently has collided or brushed away with these galaxies, and gas is scattered as debris around the galaxies.
- The optical morphologies sometimes revealed multiple nuclei and high concentration of ionized hydrogen in the central region.
- The collision between the galaxies are not detected it is revealed through radio and optical imaging.
- Thus based on the research recent collisions between the galaxies trigger intense star formation.
Dwarf Galaxies in the Universe
- There are a large number of tiny and huge galaxies are present in the universe.
- Dwarf galaxies are difficult to found out because of their low luminosity and size.
- They are classified into
- Dwarf Elliptical galaxies
- Dwarf Spheroidal galaxies
- Dwarf Irregular galaxies
- Dwarf galaxies form stars at a much slower rate than the massive ones.
- Also some dwarf galaxies are seen forming new stars at a mass normalised rate 10-100 times more than that of the Milky-way galaxy.
- These activities do not last longer than a few tens of million years which is much shorter than the age of these galaxies.
About Aryabhatta Research Institute of Observational Sciences
- Leading research Institutes which specialises in observational Astronomy & Astrophysics and Atmospheric Sciences.
- It is an an autonomous institute of Department of Science & Technology (DST).
- Research focused mainly on solar, planetary, stellar, galactic and extra-galactic astronomy including stellar variabilities, X-ray binaries, star clusters, nearby galaxies, quasars, and inherently transient events.
Source : PIB
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