How many galaxies are there? Astronomers have an estimate, but accurately counting them depends on several factors.
I will show the results of our analysis focusing in particular on the fraction of quiescent galaxies as a function of redshift and the evolution of the specific star formation rate as a function of redshift and stellar mass. The scenario emerging from these data will be compared with recent ...
The relatively shallow slope of the SMF is due to the fact that many of the UV-selected galaxies are not massive enough, and therefore are too faint in their rest-frame optical bands, to be detected in the current observations. Our results favor a more episodic formation history in which ...
Radio jets clearing the way through galaxies: the view from HI and molecular gas Massive gas outflows are considered a key component in the process of galaxy formation and evolution. Because of this, they are the topic of many studies a... Morganti,Raffaella - 《Proceedings of the Internatio...
Science Dictionary Just How Many Galaxies Are in the Universe? Space How is GPS used in spaceflight? Space 7 Facts About Arcturus, the Red Giant Star Space The Largest Star in the Universe Is 1,700x Bigger Than Our Sun Science Dictionary Cecilia Helena Payne-Gaposchkin Space The Great...
A Planetarium 被引量: 0发表: 0年 Dusty Star Forming Galaxies at High-Redshift: The Canada-UK Deep Submillimeter Survey We summarize the current identifications and redshifts of these galaxies, determined through optical, near-IR, far-IR, radio and 450um data. We find ~... T Webb,S Eale...
How many stars are in the universe? Hundreds of Hidden Galaxies Glimpsed Behind Milky Way (Video) The Milky Way's structure Astronomers know that theMilky Wayis a barred spiral galaxy that is about 100,000 light-years across. A view outside the galaxy would reveal a central bulge surrounded...
A Redshift Survey of the Submillimeter Galaxy Population We have obtained spectroscopic redshifts using the Keck-I telescope for a sample of 73 submillimeter (submm) galaxies for which precise positions are avail... SC Chapman,AW Blain,I Smail,... - 《Astrophysical Journal》 被引量: 1081...
摘要: Massive black holes (MBHs) grow together with their host galaxies throughout cosmic time. I will talk about our recent efforts covering low to high levels (i.e., basic data analyses to scientific interpretation) in building a complete picture of the MBH growth under the accretion-driven...
In fact, the merger is so messy and so distant that Ryder can’t be sure whether it’s actually two colliding galaxies or three. Because this is the most distant fast radio burst ever detected, that means its also the oldest, and it’s likely that the released energy came from a ...