| 词条 | Q2343-BX418 |
| 释义 |
HaloIn July 2018, new research was published suggesting that the galaxy was surrounded by a massive halo of diffuse gas 150,000 light years in diameter, about 10 times the size of the galaxy itself. The halo was measured to be giving off light in the Lyman-alpha line, an ultraviolet wavelength.[3] By measuring the halo's spectra using the Keck Cosmic Web Imager at the Keck Observatory, the researchers found that the galaxy is surrounded by a roughly spherical outflow of gas. They also found that there are significant variations in the density and velocity of this gas.[4] Steidel's team had studied the galaxy before using other instruments at the Keck Observatory. However, the Keck Cosmic Web Imager allowed them to study the faint gas connecting galaxies, known as the cosmic web.[5] References1. ^{{cite journal |last1=Erb |first1=Dawn K. |last2=Steidel |first2=Charles C. |last3=Shapley |first3=Alice E. |last4=Pettini |first4=Max |last5=Reddy |first5=Naveen A. |last6=Adelberger |first6=Kurt L. |title=The Stellar, Gas, and Dynamical Masses of Star-forming Galaxies at z ~ 2* |journal=The Astrophysical Journal |date=February 3, 2006 |volume=646 |issue=1 |doi=10.1086/504891 |url=http://iopscience.iop.org/article/10.1086/504891/meta |accessdate=July 27, 2018|arxiv=astro-ph/0604041 }} 2. ^{{cite journal |last1=Erb |first1=Dawn K. |last2=Steidel |first2=Charles C. |last3=Chen |first3=Yuguang |title=The Kinematics of Extended Lyα Emission in a Low-mass, Low-metallicity Galaxy at z = 2.3* |journal=The Astrophysical Journal |date=May 21, 2018 |volume=862 |issue=1 |doi=10.3847/2041-8213/aacff6 |url=http://iopscience.iop.org/article/10.3847/2041-8213/aacff6 |accessdate=July 27, 2018}} 3. ^{{cite web |last1=Mathewson |first1=Samantha |title=Giant Gas Halo May Reveal How Early Galaxies Evolved |url=https://www.space.com/41284-gas-halo-young-galaxy-evolution-clues.html |website=Space.com |accessdate=July 27, 2018}} 4. ^{{cite web |title=Giant Gaseous Halo Surrounds Young Star-Forming Galaxy |url=http://www.sci-news.com/astronomy/giant-gaseous-halo-young-star-forming-galaxy-06240.html |website=Sci-News.com |accessdate=July 27, 2018}} 5. ^{{cite web |title=Young Galaxy’s Halo Offers Clues To Its Growth And Evolution |url=http://www.keckobservatory.org/gas_halo/ |publisher=Keck Observatory |accessdate=July 27, 2018}} 2 : Dwarf galaxies|Dwarf irregular galaxies |
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