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Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
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Observations of a Magellanic Corona
Dhanesh Krishnarao1,2,3, Andrew J Fox4, Elena D'Onghia5
1Space Telescope Science Institute, Baltimore, MD, USA. dkrishnarao@coloradocollege.edu.
Nature
|September 28, 2022
Summary
Scientists detected a warm, gaseous halo around the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC), called the Magellanic Corona. This discovery helps us understand the evolution of these galaxies and their interaction with the Milky Way.
Area of Science:
- Extragalactic Astronomy
- Galaxy Evolution
- Cosmic Gas Physics
Background:
- The Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC) are nearby satellite galaxies of the Milky Way.
- Previous mass measurements suggest the LMC should possess a hot, gaseous halo (Magellanic Corona).
- The Magellanic Stream, a gas structure, is thought to be influenced by this halo.
Purpose of the Study:
- To find evidence for the predicted Magellanic Corona.
- To characterize the circumgalactic medium (CGM) surrounding the LMC and SMC.
- To understand the role of the Magellanic Corona in galactic dynamics and gas accretion.
Main Methods:
- Utilized ultraviolet (UV) absorption spectroscopy of background quasars.
- Searched for spectral signatures of highly ionized species, such as O+5, C+3, and Si+3.
- Analyzed the spatial distribution and ionization states of gas within the Magellanic CGM.
Main Results:
- Presented evidence for the Magellanic Corona through detection of O+5 absorption.
- Indirectly detected the corona via C+3 and Si+3 absorption.
- Characterized a multiphase Magellanic CGM extending at least 35 kpc, with a total ionized mass of ~10^9.1 M☉.
Conclusions:
- The existence of the Magellanic Corona is confirmed, supporting previous theoretical predictions.
- The Magellanic Corona is a component of a larger, multiphase CGM.
- This finding is crucial for understanding the Magellanic system's properties and its co-evolution within the Local Group.
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