Space galaxies found in ancient 'treasure trove' find by astronomers
11 Août, 2019, 01:07 | Auteur: Therese Cote
"The greater density of stars means there would be many more stars close by appearing larger and brighter", lead researcher Tao Wang, an astronomer at the University of Tokyo, the French Alternative Energies and Atomic Energy Commission, and the National Astronomical Observatory of Japan, said in a statement.
Astronomers uncover 39 ancient galaxies using multiple space and ground-based observatories, according to CNN.
It is the first multiple discovery of this type of galaxy, which defies current models of the universe, the researchers said. The amount of stretching allows astronomers to calculate how far away something is, which also tells you how long ago the light you're seeing was emitted from the thing in question.
The reason these galaxies were hidden from sight is that, while they were actively making stars, they also contained plenty of dust, which tends to block and obscure much of a galaxy's light. Previous studies have tracked down the existence of some massive galaxies which are not visible in ultraviolet light, but majority have been classified as extreme starburst galaxies, and it is inferred that they are unlikely to represent most of the massive galaxies.
"It was tough to convince our peers these galaxies were as old as we suspected them to be".
But how can something as big as a galaxy be invisible to begin with? But ALMA has sharp eyes and revealed details at submillimeter wavelengths, the best wavelength to peer through dust present in the early universe. The bigger the galaxy, the bigger the supermassive black hole at its center.
The study published in the Nature journal sets out that the galaxies are also intimately connected with supermassive black holes and the distribution of dark matter. "Even so, it took further data from the imaginatively named Very Large Telescope in Chile to really prove we were seeing ancient massive galaxies where none had been seen before".
"Residing in the most massive dark matter haloes at their redshifts, they are probably the progenitors of the largest present-day galaxies in massive groups and clusters", the team write.
'Theoretical researchers will need to update their theories now, ' said Prof Kohno.
Looking up at the night sky, our galaxy the Milky Way appears a bit like spilled milk.
'But conversely, the large amount of dust means farther-away stars would be far less visible, so the background to these bright close stars might be a vast dark void'.
"These gargantuan galaxies are invisible in optical wavelengths so it's extremely hard to do spectroscopy, a way to investigate stellar populations and chemical composition of galaxies".
The invention of such massive, star-forming galaxies when the universe was lower than 2 billion years outdated matches nicely with previous observations of huge, quiescent galaxies later in cosmic historical past.
Son procès devait s'ouvrir au mieux en juin 2020, avait-il appris lors d'une audience judiciaire le 31 juillet. Pour les victimes présumées, sa mort vient les priver d'un procès qu'elles attendaient avec impatience.
At the very least, India has the responsibility of promoting poverty alleviation in Indian-controlled Kashmir. It would be the former ambassador to China's first visit to Beijing after taking over as minister.
More than a million people were evacuated from their homes ahead of the storm, the official Xinhua news agency reported. Almost 200 trains through the city of Jinan in Shandong province were also suspended until Monday, Xinhua reported.
ABC News affiliate WFAA-TV in Dallas , Texas, said a funeral service with full military honors was scheduled for Saturday. The colonel was later declared missing in action after he was shot down over Laos in 1967.
Ils voyaient aussi des messages cachés dans le fait qu'il marche pieds nus et d'un autre pas que les autres membres du groupe. Ce dernier est également filmé par une caméra; les images sont diffusées en temps réel sur le site Internet des studios.
The " shooting incident " occurred on Saturday afternoon at the al-Noor Islamic Centre, local police confirmed. He was overpowered by members of the mosque before police arrived, the mosque director said.
Fan de l'émission, Edwige s'est si bien entendue avec Paul que celui-ci l'a invitée à venir dans Les 12 coups de midi . Les jours se suivent et se ressemblent pour Paul sur le plateau des 12 coups de midi .
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