SIMBAD references

2015ApJ...800...92M - Astrophys. J., 800, 92 (2015/February-3)

Properties of the magneto-ionic medium in the halo of M51 revealed by wide-band polarimetry.


Abstract (from CDS):

We present a study of the magneto-ionic medium in the Whirlpool galaxy (M51) using new wide-band multi-configuration polarization data at L band (1-2 GHz) obtained at the Karl G. Jansky Very Large Array. By fitting the observed diffuse complex polarization Q+iU as a function of wavelength directly to various depolarization models, we find that polarized emission from M51 at 1-2 GHz originates from the top of the synchrotron disk and then experiences Faraday rotation in the near-side thermal halo of the galaxy. Thus, the scale height of the thermal gas must exceed that of the synchrotron emitting gas at L band. The observed Faraday depth distribution at L band is consistent with a halo field that is comprised of a plane-parallel bisymmetric component and a vertical component that produces a Faraday rotation of ~-9 rad/m2. The derived rotation measure (RM) structure functions indicate a characteristic scale of RM fluctuations of less than 560 pc in the disk and approximately 1 kpc in the halo. The outer scale of turbulence of 1 kpc found in the halo of M51 is consistent with superbubbles and the Parker instability being the main energy injection mechanisms in galactic halos.

Abstract Copyright:

Journal keyword(s): Galaxy: halo - ISM: magnetic fields - polarization

Nomenclature: Table 1: [MZF2015] JHHMM+DDMMa N=11.

Simbad objects: 21

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