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PreprintarXiv licencearXiv

Polarization Observations of NGC 315 with FAST

  • Wenjun Zhang
  • Xiaohui Sun
  • Jie Wang
  • Xuzhi Hu
  • Shengtao Wang
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Abstract

We present new continuum and polarization observations of radio galaxy NGC 315 obtained with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) over 1.0-1.5 GHz. The FAST data detect diffuse large-scale polarized emission with a noise level of 0.065 mJy beam−1 at resolution of 4'. We derived a rotation measure (RM) map with an error of 1.1 rad m−2 including systematic error. The intrinsic RM map was obtained after subtracting the Galactic foreground contribution. We estimated a total magnetic field strength of ≲ 1 μG across the source and a thermal electron density of ∼ 10−4 cm−3 toward the northwest lobe. The fractional polarization analysis suggests a random magnetic-field component over a large area toward the northwest lobe.

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Cite

BibTeXRIS
BibTeX
@misc{zhang2026polarization,
  title = {{Polarization Observations of NGC 315 with FAST}},
  author = {Wenjun Zhang and Xiaohui Sun and Jie Wang and Xuzhi Hu and Shengtao Wang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.32587},
  eprint = {2610.32587},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.32587},
}
RIS
TY  - UNPB
TI  - Polarization Observations of NGC 315 with FAST
AU  - Wenjun Zhang
AU  - Xiaohui Sun
AU  - Jie Wang
AU  - Xuzhi Hu
AU  - Shengtao Wang
PY  - 2026
DA  - 2026/10/23
PB  - arXiv
DO  - 10.48550/arxiv.2610.32587
UR  - https://arxiv.org/abs/2610.32587
AB  - We present new continuum and polarization observations of radio galaxy NGC 315 obtained with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) over 1.0-1.5 GHz. The FAST data detect diffuse large-scale polarized emission with a noise level of 0.065 mJy beam^−1 at resolution of 4'. We derived a rotation measure (RM) map with an error of 1.1 rad m^−2 including systematic error. The intrinsic RM map was obtained after subtracting the Galactic foreground contribution. We estimated a total magnetic field strength of ≲ 1 μG across the source and a thermal electron density of ∼ 10^−4 cm^−3 toward the northwest lobe. The fractional polarization analysis suggests a random magnetic-field component over a large area toward the northwest lobe.
ER  -