Browsing Tag

galaxies

Astronomy & Space

ALMA spots merging galaxies in toddler universe – Astronomy Now

June 18, 2019 • By
An artist’s impression of merging galaxies often known as B14-65666 some 13 billion mild years away. Picture: Nationwide Astronomical Observatory of Japan

The Atacama Massive Millimeter/submillimeter Array has noticed what seems to be two galaxies crashing collectively some 13 billion years in the past, the earliest instance of a galactic merger but detected.

ALMA detected radio indicators indicating the presence of oxygen, carbon and mud within the object, often known as B14-65666 within the constellation Sextens, the earliest galactic detection of such indicators. Information evaluation signifies the radio missions had been divided into two blob-like areas the place the Hubble Area Telescope earlier revealed two star clusters.

The ALMA indicators point out the blobs are literally two galaxies shifting at totally different speeds which might be within the means of merging. The researchers estimate the whole mass of the system at lower than 10 % of the Milky Means’s, reflecting the intense youth of the parts. Even so, B14-65666 is producing stars 100 occasions extra actively than the Milky Means, yet one more indicator that two galaxies are merging.

This composite picture of B14-65666 reveals the distribution of mud (pink), oxygen (inexperienced) and carbon (blue) as detected by ALMA, together with stars (white) that had been imaged by the Hubble Area Telescope. Picture: ALMA (ESO/NAOJ/NRAO), NASA/ESA Hubble Area Telescope, Hashimoto et al.

“With rich data from ALMA and HST, combined with advanced data analysis, we could put the pieces together to show that B14-65666 is a pair of merging galaxies in the earliest era of the universe,” mentioned Takuya Hashimoto, a postdoctoral researcher on the Japan Society for the Promotion of Science and Waseda College.

“Detection of radio waves from three components in such a distant object clearly demonstrates ALMA’s high capability to investigate the distant universe.”

 


Astronomy & Space

ALMA focuses on components influencing star beginning in close by galaxies – Astronomy Now

May 4, 2019 • By

The Atacama Giant Millimetre/submillimetre Array is placing collectively an astronomical census of close by stellar nurseries referred to as the Physics at Excessive Angular decision in Close by GalaxieS, or PHANGS. Up to now, about 100,000 such nurseries have been charted over the course of greater than 750 hours of remark targeted on 74 close by galaxies. The aim is to finally characterise some 300,000 stellar nurseries to assist astronomers higher perceive why some star forming areas evolve regularly whereas others expertise speedy, if not explosive, charges of star beginning. The PHANGS examine is predicted to make clear how a galaxy’s measurement, age and inner dynamics may affect star formation.

Certainly one of 74 close by galaxies imaged by the Atacama Giant Millimeter/submillimeter Array that host quite a few stellar nurseries. Picture: ALMA (ESO/NAOJ/NRAO); NRAO/AUI/NSF, B. Saxton


Astronomy & Space

New radio map reveals big variety of beforehand unseen galaxies – Astronomy Now

February 22, 2019 • By
LOFAR observations of the galaxy cluster Abell 1314 within the constellation Ursa Main reveal radio emissions from electrons (proven in purple) that had been accelerated in collisions with different galaxy clusters. This overlay on an optical picture additionally exhibits X-ray emissions (gray haze) as seen by the Chandra X-ray Observatory. Picture: Amanda Wilber/LOFAR Surveys Group

Within the preliminary levels of a brand new sky survey, the Low Frequency Array – LOFAR – radio telescope has coated 1 / 4 of the northern sky. Within the first 10 % of that information to be launched, a global group of astronomers has discovered 300,000 radio sources, nearly all of them beforehand undetected galaxies. The group expects to search out upwards of 15 million radio sources by the point the survey is full.

“This sky map will be a wonderful scientific legacy for the future,” stated Carole Jackson, Director Basic of ASTRON, the Netherlands Institute for Radio Astronomy. “It is a testimony to the designers of LOFAR that this telescope performs so well. … Just imagine some of the discoveries we may make along the way. I certainly look forward to it.”

However pulling these discoveries from the LOFAR information is a problem, requiring networked computer systems in a number of areas utilizing highly effective new algorithms.

“LOFAR produces enormous amounts of data – we have to process the equivalent of 10 million DVDs of data,” stated Cyril Tasse, a researcher on the Observatoire de Paris. “The LOFAR surveys were recently made possible by a mathematical breakthrough in the way we understand interferometry.”

Raymond Oonk, with the SURFsara info communications know-how middle in Amsterdam, stated the LOFAR information set “is the largest astronomical data collection in the world.”

“Processing the enormous data sets is a huge challenge for scientists. What normally would have taken centuries on a regular computer was processed in less than one year using the high throughput compute cluster (Grid) and expertise.”

A particular difficulty of the journal Astronomy & Astrophysics options 26 papers describing preliminary outcomes from the LOFAR survey. Supermassive black holes and galaxy clusters are main subjects of curiosity.