Peering into the Milky Way by FAST: III. Magnetic fields in the Galactic halo and farther spiral arms revealed by the Faraday effect of faint pulsars

Abstract

The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is the most sensitive radio telescope for pulsar observations. We make polarimetric measurements of a large number of faint and distant pulsars using the FAST. We present the new measurements of Faraday rotation for 134 faint pulsars in the Galactic halo. Significant improvements are also made for some basic pulsar parameters for 15 of them. We analyse the newly determined rotation measures (RMs) for the Galactic magnetic fields by using these 134 halo pulsars, together with previously available RMs for pulsars and extragalactic radio sources and also the newly determined RMs for another 311 faint pulsars which are either newly discovered in the project of the Galactic Plane Pulsar Snapshot (GPPS) survey or previously known pulsars without RMs. The RM tomographic analysis in the first Galactic quadrant gives roughly the same field strength of around 2~$\mu$G for the large-scale toroidal halo magnetic fields. The scale height of the halo magnetic fields is found to be at least 2.7$\pm$0.3~kpc. The RM differentiation of a large number of pulsars in the Galactic disk in the Galactic longitude range of $26^{\circ }<l<90^{\circ }$ gives evidence for the clockwise magnetic fields (viewed from the north Galactic pole) in two interarm regions inside the Scutum arm and between the Scutum and Sagittarius arm, and the clockwise fields in the Local-Perseus interarm region and field reversals in the Perseus arm and beyond.

arXiv commentPublished by ScienceChinaPMA on the special topic "Peering into the Milky Way by FAST" https://www.sciengine.com/SCPMA/issue/65/12

References in corpus (53)

• The ATNF Pulsar Catalogue
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Final Maps and Results
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• The Five-Hundred-Meter Aperture Spherical Radio Telescope (FAST) Project
• A New Model of the Galactic Magnetic Field
• DSPSR: Digital Signal Processing Software for Pulsar Astronomy
• Radio observational constraints on Galactic 3D-emission models
• Pulsar rotation measures and the large-scale structure of Galactic magnetic field
• The Vertical Structure of Warm Ionised Gas in the Milky Way
• Deriving global structure of the Galactic Magnetic Field from Faraday Rotation Measures of extragalactic sources
• The observed spiral structure of the Milky Way
• An improved map of the Galactic Faraday sky
• Pulsar rotation measures and the magnetic structure of our Galaxy
• Rotation Measures of Extragalactic Sources Behind the Southern Galactic Plane: New Insights into the Large-Scale Magnetic Field of the Inner Milky Way
• The FAST Galactic Plane Pulsar Snapshot survey: I. Project design and pulsar discoveries
• Modeling the Magnetic Field in the Galactic Disk using New Rotation Measure Observations from the Very Large Array
• Estimating extragalactic Faraday rotation
• Ultrahigh Energy Cosmic Rays
• A Survey of Extragalactic Faraday Rotation at High Galactic Latitude: The Vertical Magnetic Field of the Milky Way towards the Galactic Poles
• Systematic bias in interstellar magnetic field estimates
• The Swinburne Intermediate Latitude Pulsar Survey
• A LOFAR census of non-recycled pulsars: average profiles, dispersion measures, flux densities, and spectra
• Pulsar Rotation Measures and Large-scale Magnetic Field Reversals in the Galactic Disk
• New pulsar rotation measures and the Galactic magnetic field
• Low-frequency Faraday rotation measures towards pulsars using LOFAR: probing the 3-D Galactic halo magnetic field
• The LOFAR Tied-Array All-Sky Survey (LOTAAS): Survey overview and initial pulsar discoveries
• The Galactic magnetic field and propagation of ultra-high energy cosmic rays
• Goals, Strategies and First Discoveries of AO327, the Arecibo All-Sky 327 MHz Drift Pulsar Survey
• New Pulsars from an Arecibo Drift Scan Search
• Observational constraints on models for the interstellar magnetic field in the Galactic disk
• New Constraints on the Galactic Halo Magnetic Field using Rotation Measures of Extragalactic Sources Towards the Outer Galaxy
• Detection of new pulsars at the frequency 111 MHz
• Counterclockwise magnetic fields in the Norma spiral arm
• Constraints on Axion-like Particles from a Hard $X$-ray Observation of Betelgeuse
• Constraints from Faraday rotation on the magnetic field structure in the Galactic halo
• New Discoveries from the Arecibo 327 MHz Drift Pulsar Survey Radio Transient Search
• Magnetic fields in the Milky Way from pulsar observations: effect of the correlation between thermal electrons and magnetic fields
• Strong excess Faraday rotation on the Inside of the Sagittarius spiral arm
• S-PASS/ATCA: a window on the magnetic universe in the southern hemisphere
• A compiled catalog of rotation measures of radio point sources
• Faraday Rotation in Pulsar Magnetosphere
• Search and detection of pulsars in the monitoring observations at the frequency 111 MHz
• Faraday rotation measures of northern-hemisphere pulsars using CHIME/Pulsar
• The NANOGrav 12.5-Year Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope
• Three-Dimensional Structure of the Magnetic Field in the Disk of the Milky Way
• The Complex Large-scale Magnetic Fields in the First Galactic Quadrant as Revealed by the Faraday Depth Profile Disparity
• Revisiting Rotation Measures from the Canadian Galactic Plane Survey: the Magnetic Field in the Disk of the Outer Galaxy
• Peering into the Milky Way by FAST: II. Ionized gas in the inner Galactic disk revealed by the piggyback line observations of the FAST GPPS survey
• Peering into the Milky Way by FAST: IV. Identification of two new Galactic supernova remnants G203.1+6.6 and G206.7+5.9
• Magnetic Field and Faraday Rotation Measure in the Turbulent Warm Ionized Medium
• Peering into the Milky Way by FAST: I. Exquisite HI structures in the inner Galactic disk from the piggyback line observations of the FAST GPPS survey
• Estimation of Magnetic Field Strength in the Turbulent Warm Ionized Medium

Cited by in corpus (7)

• The FAST Galactic Plane Pulsar Snapshot survey: VI. The discovery of 473 new pulsars
• The FAST Galactic Plane Pulsar Snapshot Survey: II. Discovery of 76 Galactic rotating radio transients and their enigma
• Peering into the Milky Way by FAST: II. Ionized gas in the inner Galactic disk revealed by the piggyback line observations of the FAST GPPS survey
• Peering into the Milky Way by FAST: IV. Identification of two new Galactic supernova remnants G203.1+6.6 and G206.7+5.9
• Peering into the Milky Way by FAST: I. Exquisite HI structures in the inner Galactic disk from the piggyback line observations of the FAST GPPS survey
• The Huge Magnetic Toroids in the Milky Way Halo
• Accurate polarization calibration of FAST spectral data for measurements of Zeeman splittings of OH megamasers in IRAS 02524+2046