technology-news

3D mapping reveals Milky Way galaxy has peanut-shaped core

Washington, Sept. 13 : Scientists have produced a detailed three-dimensional map of the stars that form the inner regions of our Milky Way galaxy.


They found a box/peanut shaped bulge with an elongated bar and a prominent X-structure, which had been hinted at in previous studies.

This indicates that the Milky Way was originally a pure disk of stars, which then formed a thin bar, before buckling into the box/peanut shape seen today.

By using a large number of so-called "red clump" giant stars from the new VVV survey scientists at the Max Planck Institute for Extraterrestrial Physics produced the 3-dimensional map of the galactic bulge.

The scientists used the VVV near-infrared survey of the bulge conducted with the VISTA telescope in Chile, which covers the inner regions of the Milky Way and is able to observe stars thirty times fainter than previous bulge surveys.

The observations were carried out by the VVV team, who then made their images and star catalogues available to the international community as science data products in the ESO science archive facility.

Red clump giant stars were chosen for this study as they can be used as a standard candle: at this stage in the star's lifetime their luminosity is approximately independent of their age or composition.

The amount of gas and dust obscuring the stars is calculated directly from the observed colours of the red clump stars, so that their brightness distribution without obscuration can be measured.

Because red clump stars have nearly the same intrinsic brightness, this gives approximate distances to each star.

The good spatial coverage of the VVV survey allowed measurements across the whole inner region of the Milky Way, and from these the three-dimensional measurement of the structure of the bulge was constructed.

--ANI (Posted on 13-09-2013)

technology-news headlines

New insights on how brain develops memories

Oxygen injections to protect you from air pollution

Sea deposits to build your smart phone!

Google Glass to assist surgeons soon

Soon, floating n-plants that survive tsunami, quakes

Ancient meteors reveal Red Planet's early atmosphere

Global warming to hit your bubbly's taste!

How gut microbes helped our ancestors adapt and survive during Paleolithic era

Three more 'blood moons' to appear in next 18 months

T. rex's neck was powerful enough to hunt and attack

Planets having odd tilts could be habitable

Mars' thin atmosphere may have led to its cold, dry conditions

Quick Links: Goa | Munnar | Pondicherry | Free Yearly Horoscope '2014

Comments

Your e-mail:


Your Full Name:


Type verification image:
verification image, type it in the box

Message:

Back to Top