|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'500'096
Articles rated: 2609
19 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Constraining Magnetic Fields in the Circumgalactic Medium | | Ting-Wen Lan
; J. Xavier Prochaska
; | | Date: |
16 Jun 2020 | | Abstract: | We study the properties of magnetic fields in the circumgalactic medium (CGM)
of $z<1$ galaxies by correlating Faraday rotation measures of $sim 1,000$
high-redshift radio sources with the foreground galaxy number density estimated
from the DESI Legacy Imaging Surveys. This method enables us to extract signals
of rotation measures contributed by intervening gas around multiple galaxies.
Our results show that there is no detectable correlation between the
distribution of rotation measures and the number of foreground galaxies,
contrary to several previous results. Utilizing the non-detection signals, we
estimate $3sigma$ upper limits to the rotation measures from the CGM of $sim
20
m rad/m^{2}$ within~50 kpc and $sim 10
m rad / m^{2}$ at
separations of $100$ kpc. By adopting a column density distribution of ionized
gas obtained from absorption line measurements, we further estimate the
strengths of coherent magnetic fields parallel to the line of sight of $<
m 2
mu G$ in the CGM. We show that the estimated upper limits of rotation
measures and magnetic field strengths are sufficient to constrain outputs of
recent galaxy magneto-hydrodynamic simulations. Finally, we discuss possible
causes for the inconsistency between our results and previous works. | | Source: | arXiv, 2006.9369 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER