Home » News » Science&Technology » ARIES astronomers trace the mystery behind dwarf galaxy aberrations of massive star formatio

ARIES astronomers trace the mystery behind dwarf galaxy aberrations of massive star formatio

Amidst the billions of galaxies in the universe, a large number are tiny ones 100 times less massive than our own Milky-way galaxy. While most of these tiny tots called dwarf galaxies form stars at a much slower rate than the massive ones, some dwarf galaxies are seen forming new stars at a mass-normalized rate 10-100 times more than that of the Milky-way galaxy. These activities, however, do not last longer than a few tens of million-years, a period which is much shorter than the age of these galaxies – typically a few billion years.

Scientists observing dozens of such galaxies using two Indian telescopes have found that the clue to this strange behaviour of these galaxies lies in the disturbed hydrogen distribution in these galaxies and also in recent collisions between two galaxies.To understand the nature of star formation in dwarf galaxies astronomers Dr. Amitesh Omar and his former student Dr. Sumit Jaiswal from Aryabhatta Research Institute of Observational Sciences (ARIES), an autonomous institute of Department of Science & Technology (DST), Govt. of India observed many such galaxies using the 1.3-meter Devasthal Fast Optical Telescope (DFOT) near Nainital and the Giant Meter wave Radio Telescope (GMRT). While the former operated at optical wavelengths sensitive to detect optical line radiation emanating from the ionized Hydrogen, in the latter 30 dishes of 45-meter diameter, each worked in tandem and produced sharp interferometric images via spectral line radiation at 1420.40 MHz coming from the neutral Hydrogen in galaxies.

Star formation at a high rate requires very high density of Hydrogen in the galaxies. According to the study conducted by the ARIES team, the 1420.40 MHz images of several intense star-forming dwarf galaxies indicated that hydrogen in these galaxies is very disturbed. While one expects a nearly symmetric distribution of hydrogen in well-defined orbits in galaxies, hydrogen in these dwarf galaxies is found to be irregular and sometimes not moving in well-defined orbits. 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.  Although galaxy-galaxy collision was not directly detected, various signatures of it were revealed through radio, and optical imaging, and these are helping to build up a story. The research, therefore, suggests that recent collisions between two galaxies trigger intense star formation in these galaxies.

The findings of this research with detailed images of 13 galaxies will be appearing in the forthcoming issue of Monthly Notices of Royal Astronomical Society (MNRAS) Journal published by the Royal Astronomical Society, the U.K. It will help astronomers to understand the formation of stars and evolution of less massive galaxies in the Universe.

 

About IIPnews

Leave a Reply

Your email address will not be published. Required fields are marked *

*

x

Check Also

INST efforts to make magnetic hyperthermia-mediated cancer therapy as desired therapy for inoperable tumours

“The example from INST Mohali illustrates some of the compelling aspects of how Nanotechnology is ...

Indigenous Air Unique-quality Monitoring (AUM) Photonic System developed for Real-Time Remote Monitoring of Air Quality

World Health Organisation (WHO)’s reports show that the worsening state of poor air quality is ...

Shadesmart & Radiant Cooling technologies promote energy-efficient cooling in buildings

Indian building sector has realized the importance of energy efficiency but it is yet to ...

Equipment-free, a simple paper-strip based naked-eye fluoride ion detection and quantification kit in drinking water to evade Fluorosis-based disorders

Fluorosis is a crippling disease resulting from deposition of fluorides in the hard and soft ...

INST scientists develop simple economical nonsurgical prevention of cataract

Cataract a major form of blindness that occurs when the structure of crystallin proteins that ...

Asian elephant cubs show handedness in trunk behaviour earlier than adult usage of trunks

Asian elephant calves offer an interesting system to study the development of behaviour. They are ...

Active respirator mask & nano-sanitiser developed by SNBNCBS can help in combatting COVID 19

The COVID-19 pandemic has made the use of face mask an inevitable part of daily ...

Gravel geometry of the Indus river unravel its paleoclimatic history

 Researchers from Wadia Institute of Himalayan Geology (WIHG), Dehradun, an autonomous institute under the Department ...

ARCI scientists develop next-generation biodegradable metal implants

The team is certain that the newly developed alloys are suitable for biodegradable stent and ...

DRDO develops UV Disinfection Tower

Defence Research and Development Organisation (DRDO) has developed an Ultra Violet (UV) Disinfection Tower for ...

WP2Social Auto Publish Powered By : XYZScripts.com