Revisiting the Distance to Radio Loops I and IV Using Gaia and Radio/Optical Polarization Data
@article{Panopoulou2021RevisitingTD, title={Revisiting the Distance to Radio Loops I and IV Using Gaia and Radio/Optical Polarization Data}, author={Georgia V. Panopoulou and Clive Dickinson and Anthony C. S. Readhead and T. J. Pearson and M. W. Peel}, journal={The Astrophysical Journal}, year={2021}, volume={922} }
Galactic synchrotron emission exhibits large angular scale features known as radio spurs and loops. Determining the physical size of these structures is important for understanding the local interstellar structure and for modeling the Galactic magnetic field. However, the distance to these structures is either under debate or entirely unknown. We revisit a classical method of finding the location of radio spurs by comparing optical polarization angles with those of synchrotron emission as a…
4 Citations
Whence the Interstellar Magnetic Field Shaping the Heliosphere?
- PhysicsThe Astrophysical Journal Supplement Series
- 2022
Measurements of starlight polarized by aligned interstellar dust grains are used to probe the relation between the orientation of the ambient interstellar magnetic field (ISMF) and the ISMF traced by…
A Unified Model for the Fan Region and the North Polar Spur: A Bundle of Filaments in the Local Galaxy
- PhysicsThe Astrophysical Journal
- 2021
We present a simple, unified model that can explain two of the brightest, large-scale, diffuse, polarized radio features in the sky, the North Polar Spur (NPS) and the Fan Region, along with several…
Fermi and eROSITA bubbles as relics of the past activity of the Galaxy’s central black hole
- PhysicsNature Astronomy
- 2022
The newly launched X-ray satellite, eRosita, has recently revealed two gigantic bubbles extending to ∼ 80◦ above and below the Galactic center. The morphology of these “eRosita bubbles” bears a…
North Polar Spur/Loop I: gigantic outskirt of the Northern Fermi bubble or nearby hot gas cavity blown by supernovae?
- PhysicsComptes Rendus. Physique
- 2022
Radio continuum, microwave and gamma-ray images of the Milky Way reveal a conspicuous, looplike structure that fills almost half of the northern Galactic hemisphere, called Loop I. The interior of…
References
SHOWING 1-10 OF 89 REFERENCES
Large-Scale Features of the Radio Sky and a Model for Loop I
- Physics
- 2018
The large-scale radio/microwave sky has been mapped over a range of frequencies from tens of MHz to tens of GHz, in intensity and polarization. The emission is primarily synchrotron radiation from…
Polarized radio filaments outside the Galactic plane
- Physics
- 2015
We used data from the WMAP satellite at 23, 33 and 41 GHz to study the diffuse polarized emission over the entire sky. The emission originates mostly from filamentary structures with well-ordered…
Local Bubble contribution to the 353-GHz dust polarized emission
- PhysicsAstronomy & Astrophysics
- 2019
It has not been shown so far whether the diffuse Galactic polarized emission at frequencies relevant for cosmic microwave background (CMB) studies originates from nearby or more distant regions of…
Three Year Wilkinson Microwave Anistropy Probe (WMAP) Observations: Polarization Analysis
- Physics
- 2007
The Wilkinson Microwave Anisotropy Probe (WMAP) has mapped the entire sky in five frequency bands between 23 and 94 GHz with polarization sensitive radiometers. We present three-year full-sky maps of…
Planck intermediate results. XLII. Large-scale Galactic magnetic fields
- Physics
- 2016
Recent models for the large-scale Galactic magnetic fields in the literature were largely constrained by synchrotron emission and Faraday rotation measures. We select three different but…
A NEW ELECTRON-DENSITY MODEL FOR ESTIMATION OF PULSAR AND FRB DISTANCES
- Physics
- 2016
We present a new model for the distribution of free electrons in the Galaxy, the Magellanic Clouds, and the intergalactic medium (IGM) that can be used to estimate distances to real or simulated…
Bipolar Hypershell Galactic Center Starburst Model: Further Evidence from ROSAT Data and New Radio and X-Ray Simulations
- Physics
- 2000
Using the all-sky ROSAT soft X-ray and 408 MHz radio continuum data, we show that the North Polar Spur (NPS) and its western and southern counterspurs draw a giant dumbbell shape necked at the…
On the distance to the North Polar Spur and the local CO-H2 factor.
- PhysicsAstronomy & astrophysics. Supplement series
- 2016
Relationships between X-ray brightness, absorbing column and hardness ratio demonstrate a brightness decrease with latitude governed by increasing absorption, and the comparison with absorption data, local and large-scale dust maps rules out a NPS near side closer than 300 pc.
Constraining the distance to the North Polar Spur with Gaia DR2
- Physics
- 2020
The North Polar Spur (NPS) is one of the largest structures observed in the Milky Way in both the radio and soft x-rays. While several predictions have been made regarding the origin of the NPS,…
Planck intermediate results. XVII. Emission of dust in the diffuse interstellar medium from the far-infrared to microwave frequencies
- Physics
- 2014
The dust-Hi correlation is used to characterize the emission properties of dust in the diffuse interstellar medium (ISM) from far infrared wavelengths to microwave frequencies. The field of this…