Washington, May 2 IANS | 6 months ago

Supernovae or exploding stars observed by NASA's Hubble Space Telescope are providing astronomers a powerful tool to determine the strength of naturally-occurring 'cosmic lenses'.


Such 'cosmic lenses' are used to magnify objects in the remote universe that might otherwise be too faint to see, even with today's largest telescopes, the US space agency said in a statement.

Astronomers use the gravitational lensing effect to search for distant objects.

Two teams of astronomers, working independently, observed three such supernovae.

Their light was amplified by the immense gravity of massive galaxy clusters in the foreground - a phenomenon called gravitational lensing.

"We have found supernovae that can be used like an eye chart for each lensing cluster," explained Saurabh Jha of Rutgers University in Piscataway, New Jersey, a member of the Cluster Lensing and Supernova survey with Hubble (CLASH) team.

"Because we can estimate the intrinsic brightness of the supernovae, we can measure the magnification of the lens," the Indian-American professor added.

At least two of the supernovae appear to be a special type of exploding star called Type Ia supernovae that have a consistent level of peak brightness that makes them a reliable tool for estimating distances, the NASA statement said.

The three supernovae in the Hubble study were each gravitationally lensed by a different cluster of galaxies.

The teams measured the brightness of each supernova, with and without the effects of lensing.

The difference between the two measurements constitutes the amount of magnification because of gravitational lensing.

The supernovae were discovered in the CLASH survey, a Hubble census that probed the distribution of dark matter in 25 galaxy clusters.

Astronomers are searching for more Type Ia supernovae hiding behind large galaxy clusters.

The CLASH team's results appeared in The Astrophysical Journal and the Supernova Cosmology Project's results appeared in Monthly Notices of the Royal Astronomical Society.

(Posted on 02-05-2014)

Share This Page:


Post your comments


Information on States of India:

Andaman Nicobar | Andhra Pradesh | Arunachal Pradesh | Assam | Bihar | Chandigarh | Chhattisgarh | Dadar Nagar Haveli | Daman Diu | Delhi | Goa | Gujarat | Haryana | Himachal Pradesh | Jammu Kashmir | Jharkhand | Karnataka | Kerala | Lakshadweep | Madhya Pradesh | Maharashtra | Manipur | Meghalaya | Mizoram | Nagaland | Orissa | Pondicherry | Punjab | Rajasthan | Sikkim | Tamil Nadu | Tripura | Uttar Pradesh | Uttaranchal | West Bengal

INDIA REGIONAL MAPS:

Andhra Pradesh Travel Map | Bihar Travel Map | Goa Travel Map | Gujarat Travel Map | Haryana Travel Map | Himachal Pradesh Map | Karnataka Travel Map | Kerala Travel Map | Maharashtra Travel Map | Punjab Travel Map | Rajasthan Travel Map | Sikkim Travel Map | Tamil Nadu Travel Map | Uttar Pradesh Travel Map | West Bengal Travel Map |

KERALA TRAVEL MAPS:

Alappuzha | Ernakulam | Idukki | Kannur | Kasaragod | Kollam | Kottayam | Kozhikode | Malappuram | Palakkad | Pathanamthitta | Thiruvananthapuram | Thrissur | Wayanad |

TRAVEL MAPS OF INDIA:

Airports of India | Districts of India | India Pilgrim Centers | Tourism Map of India | National Highways in India | India Railway Routes |

INDIA CITY MAPS:

Ahmadabad | Bangalore | Chennai | Coimbatore | Delhi | Hyderabad/Secunderabad | Kochi | Kolkata | Mumbai | Pondicherry | Pune | Surat |