VLA radio continuum observations of the edge-on spiral galaxy NGC 3079

Duric, Nebojsa; Seaquist, E. R.; Crane, P. C.; Bignell, R. C.; Davis, L. E.

doi:10.1086/184120

Cited by 49 publications

(28 citation statements)

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“…Similar jet-like structures on kpc scales have been reported for some edge-on spiral galaxies before (Duric et al, 1983).…”

supporting

confidence: 84%

The Large-Scale Magnetic Field Structure Near the Galactic Centre

Reich

1990

Symp. - Int. Astron. Union

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ABSTRACT.High frequency polarization observations reveal the existence of a poloidal magnetic field structure in the Galactic Centre region on scales of about 200 pc. At lower frequencies large non-thermal spurs are seen tracing the magnetic field up to kpc distances from the Galactic Centre.The well known mixture of thermal and non-thermal emission structures close to the Galactic Centre region requires high frequency observations to trace the magnetic field structure. Fig. 1 shows a preliminary 32 GHz map observed with the Effelsberg 100-m telescope of the "arc" region. This is a bar-like structure running almost perpendicular to the Galactic plane at a distance of about 0*2 from Sgr A. 32 GHz is a frequency high enough that rotation measures of several thousand rad m~2 are required to cause a significant rotation of the observed polarization angles from the intrinsic magnetic field direction. In Fig. 1 a very regular magnetic field structure is seen running along the arc with polarization percentages close to 50% (for -5' ^ b ^ -10'). This percentage polarization is near to the intrinsic value of about 60% for the non-thermal flat spectrum emission seen in this region (Reich et al., 1988a). The equipartition magnetic field strength is about 135 ßG. Strong thermal filaments crossing the arc at b = -2* (Yusef-Zadeh et al., 1989) cause complete depolarization. North of this region the percentage polarization is about 30%. This implies the existence of a non-thermal component with a fraction of at least 60% of the total emission, beside a weaker thermal component as indicated by recombination line observations. A rotation measure of about -10000 rad m" 2 is expected for this region for the case that the magnetic field direction continues to run parallel to the arc structure.The arc connects two large highly polarized plumes north and south of the Galactic plane. These have been observed with the 100-m telescope at 10.7 GHz (Seiradakis et al., 1985; as shown in Fig. 1. From two rotation measure determinations (Sofue et al., 1987;Tsuboi et al., 1986) the magnetic field direction was found to run perpendicular to the Galactic plane. This has been taken as evidence for the existence of a poloidal magnetic field component in the Galactic Centre region on

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“…Similar jet-like structures on kpc scales have been reported for some edge-on spiral galaxies before (Duric et al, 1983).…”

supporting

confidence: 84%

The Large-Scale Magnetic Field Structure Near the Galactic Centre

Reich

1990

Symp. - Int. Astron. Union

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“…The Galactic center lobe found by Sofue and Handa (1984) may be either a starburst outflow or a low energy prototype of AGN jets (Shibata 1989). Similar elongated flow features are observed also in NGC 3079 (e.g., Duric et al 1983), and in NGC 253 (Turner 1985). It is again very likely that the collimation of these outflows is due to vertical magnetic fields penetrating the galactic center disk.…”

Section: Introductionsupporting

confidence: 53%

Computational MHD Jets

Shibata

1990

Symp. - Int. Astron. Union

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ABSTRACT. By using two-dimensional magnetohydrodynamic (MHD) code, the following nonsteady MHD jets and outflows are studied in relation to jets ejected from central regions of galaxies: (1) a jet driven by gas pressure gradient, collimated by vertical magnetic fields (as a model of bipolar flows ejected from a hot bubble created by starbursts); (2) a magnetic twist jet which is accelerated and collimated by J χ Β force in relaxing magnetic twists generated by the interaction of poloidal fields with a rotating disk (as a model of jets from active galactic nuclei); (3) a magnetic-loop-outflow resulting from the Parker instability, which may account for the initial acceleration of the magnetic twist jet and nonthermal emissions near nuclear accretion disks.

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“…An additional argument in support of the hypershell model comes from extragalactic observations. Several galaxies, in fact, show outflows (Duric et al 1983;Nakai et al 1987;Bland & Tully 1988;Shopbell & Bland-Hawthorn1998;Pietsch et al2000;Cecil et al 2001Cecil et al , 2002Ohyama et al2002;Veilleux & Rupke2002) similar to the one predicted by Sofue (2000) for the Milky Way.…”

Section: Introductionmentioning

confidence: 72%

Studying the Interstellar Medium and the Inner Region of NPS/Loop 1 With Shadow Observations Toward Mbm36

Ursino

Galeazzi

Liu

2015

ApJ

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We analyzed data from a shadow observation of the high density molecular cloud MBM36 (l∼4°, b∼35°) with Suzaku. MBM36 is located in a region that emits relatively weakly in the 3/4 keV band compared to the surrounding North Polar Spur (NPS)/Loop 1 structure and the Galactic Bulge (GB). The contrast between high and low density targets in the MBM36 area allows one to separate the local and distant contributors to the soft diffuse X-ray background, providing a much better characterization of the individual components compared to single pointing observations. We identify two non-local thermal components, one at kT≈0.12 keV and one at kT≈0.29 keV. The colder component matches well with models of emission from the higher latitude region of the GB. The emission of the warmer component is in agreement with models predicting that the NPS is due to a hypershell from the center of the Milky Way. Geometrical and pressure calculations rule out a nearby bubble as responsible for the emission associated with the NPS. Any Galactic Halo/circumgalactic halo emission, if present, is outshined by the other components. We also report an excess emission around 0.9 keV, likely due to an overabundance of Ne IX.

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VLA radio continuum observations of the edge-on spiral galaxy NGC 3079

Cited by 49 publications

References 0 publications

The Large-Scale Magnetic Field Structure Near the Galactic Centre

The Large-Scale Magnetic Field Structure Near the Galactic Centre

Computational MHD Jets

Studying the Interstellar Medium and the Inner Region of NPS/Loop 1 With Shadow Observations Toward Mbm36

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