搜索结果: 16-30 共查到“天文学 Galaxies”相关记录488条 . 查询时间(0.166 秒)
Before light travelled across it, the universe was a dark place. For about a billion years after the Big Bang, the cosmos was cloaked in a thick fog of hydrogen gas that kept light trapped. But as ear...
A study of spiral galaxies seen edge-on has revealed that "halos" of cosmic rays and magnetic fields above and below the galaxies' disks are much more common than previously thought.An international t...
Pairs of Supermassive Black Holes in Galaxies May Be Rarer Than Previously Thought（图）
Supermassive Black Holes Galaxies Previously Thought
2015/9/25
There may be fewer pairs of supermassive black holes orbiting each other at the cores of giant galaxies than previously thought, according to a new study by astronomers who analyzed data from the Nati...
Milky Way-Like Galaxies May Have Existed in the Early Universe
Milky Way-Like Galaxies Early Universe
2015/8/13
A new, large-scale computer simulation has shown for the first time that large disk galaxies, much like our own Milky Way, may have existed in the early days of the universe.
NOAO:Hiding in Plain Sight:Undergraduates Discover the Densest Galaxies Known
NOAO Hiding in Plain Sight Undergraduates Densest Galaxies Known
2015/8/4
Two undergraduates at San José State University have discovered two galaxies that are the densest known. Similar to ordinary globular star clusters but a hundred to a thousand times brighter, the new ...
ALMA Witnesses Assembly of Galaxies in the Early Universe for the First Time
ALMA Witnesses Assembly of Galaxies Early Universe First Time
2015/8/4
The Atacama Large Millimeter/submillimeter Array (ALMA) has detected the most distant clouds of star-forming gas yet found in normal galaxies in the early Universe. The new observations allow astronom...
ALMA Detects First Traces of Carbon ‘Smog’ Permeating Interstellar Atmospheres of Early Galaxies（图）
ALMA Detects First Traces Smog Permeating Interstellar Atmospheres Early Galaxies
2015/7/13
Astronomers study the elements scattered between the stars to learn about the internal workings of galaxies, their motion and chemistry. To date, however, attempts to detect the telltale radio signatu...
Why Do Starburst Galaxies 'Burst'? ALMA Sees Super Stellar Nurseries at Heart of Sculptor Galaxy
Starburst Galaxies Burst Super Stellar Nurseries Heart of Sculptor Galaxy
2015/3/4
Starburst galaxies transmute gas into new stars at a dizzying pace – up to 1,000 times faster than typical spiral galaxies like the Milky Way. To help understand why some galaxies "burst" while others...
We study the predicted sub-mm emission from massive galaxies in a Lambda-CDM universe, using hydrodynamic cosmological simulations. Assuming that most of the emission from newly formed stars is absorb...
We examine the cooling radiation from forming galaxies in hydrodynamic simulations of the LCDM model (cold dark matter with a cosmological constant), focusing on the Lyα line luminosities of high-reds...
Radio-to-Far-Infrared Spectral Energy Distribution and Photometric Redshifts for Dusty Starburst Galaxies
galaxies photometric
2014/12/26
As a logical next step in improving the radio-to-submillimeter spectral index as a redshift indicator, we have investigated a technique of using the entire radio-to-far-infrared spectral energy distri...
High-redshift galaxies in cold dark matter models
dark matter large-scale structure of the Universe
2014/12/26
We use hydrodynamic cosmological simulations to predict the star formation properties of high-redshift galaxies (z = 2-6) in five variants of the inflationary cold dark matter scenario, paying particu...
Title: Chandra Observations of the Galactic Center and Nearby Edge-on Galaxies
Galactic Center Nearby Edge-on Galaxies
2014/12/26
I review our recent Chandra surveys of the center region of the Milky Way and other nearby edge-on galaxies. Our Galactic center survey provides an unprecedented high-resolution, broad-band X-ray pano...
We use hydrodynamic simulations to examine how the baryonic components of galaxies are assembled, focusing on the relative importance of mergers and smooth accretion in the formation of ~L* systems. I...
Investigating the long-term evolution of galaxies: Noise, cuspy halos and bars
cuspy halos bars
2014/12/26
I review the arguments for the importance of halo structure in driving galaxy evolution and coupling a galaxy to its environment. We begin with a general discussion of the key dynamics and examples of...