Some terminology:
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Some terminology: Regular magnetic field: a unidirectional one: RM 0 Pseudo-regular field: an anisotropic random one: <Bx 2 > > <By 2 > RM=0.

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Magnetic fields in perturbed galaxies a sensitive measure of external influences or

Some terminology:

Regular magnetic field: a unidirectional one: RM0

Pseudo-regular field: an anisotropic random one: <Bx2> > <By2> RM=0

  • Magnetic fields in perturbed galaxies: a sensitive measure of external influences

  • or

  • Why to observe abnormal galaxies when we don’t yet fully understand normal ones?


A merging pair

15%

10%

40%

1%

NGC 4038/39 4.85 GHz DSS+TP+B-vec

A merging pair

Fundamental work by Chyży & Beck 2004,


A merging pair1

NGC 4038/39 4.85 GHz DSS+TP+B-vec

A merging pair

Fundamental work by Chyży & Beck 2004,

Highly polarized „collisionregion”

Low-polarization hidden SF region

Highly polarized, steep spectrum outflow region


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

a magnetic bridge?

TP conts + PI B-vecs

Drzazga, Chyży in prep.

NGC 877


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

NGC4490/85 another interacting pair

Knapik et. al. in prep.

Late type, no AGN


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

NGC 4490/85 a magnetized stream??

HI image: Clemens, Alexander, Green 1998


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

PV along this line and analogous along the NW arm

Soida et al. 2001`


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

NW normal region

Diffuse CO(1-0) gas IRAM dish (Reuter et al. 1996)

Clumpy CO(1-0) gas OVRO interf. (Soida et al. in prep)

SE abnormal region

Diifuse CO gas

Clumpy CO gas


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

Colour – clumpy cool gas seen by OVRO, conts – IRAM 1-0 upper panel: polarized intensity

Colour – clumpy cool gas seen by OVRO, conts – HHT 3-2 upper panel: polarized intensity

Data: OVRO –M. Soida,

IRAM – Reuter et al. 1006

CO(3-2) HHT – Krakow + Bonn (M. Dumke, M. Krause, R. Wielebinski), in prep.

A very personal remark: Without polarization observations probably these anomalies would remain unnoticed?

Soida et al. in prep.


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

Stephan’s Quintet

IR – Appleton et al. Spitzer gallery

X-rays – Trinchieri et al.. 2003


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

Bt = 7G Bu = 1.5 G

Bt = 8G Bu = 2G

Soida et al. in prep.

Genuine intergalactic (quasi) regular magnetic field

TP conts+PI B-vecs VLA 6cm


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

15%

85%

Motion?

NGC 4501 in the Virgo Cluster

TP+PI B-vecs, VLA 6cm

Vollmer et al. 2007 + Kraków+Bonn& NRAO teams


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

NGC 4501 rectified: Assymmetry of the magnetic pitch angles

Data from Vollmer et al. 2007 + Kraków+Bonn & NRAO teams


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

Polarization used to constrain the model

Vollmer et al. (incl. Krakow, Bonn &NRAO teams) 2008

Pmax=2000cm-3(km s-1)2 twind= 80Myr


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

Colour - HI

????

NGC 4654

TP contours +PI vecs VLA 20cm

Radio data Vollmer et al. 2007 (incl. Krakow, Bonn & NRAO teams)

HI Phookun & Mundy 1995.


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

NGC 4535 – in southern Virgo extension – a „no reason” face-on case

Vollmer et al. (incl. Krakow, Bonn & NRAO teams) 2007

Galaxy motion?

NGC 4402 blown from the bottom?

TP conts + PI vecs VLA 6cm

Edge-on „no reason” case


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

Motion?

M86 environment

NGC 4438

H (red) Kenney et al. 2008

X-rays (green) M. Weżgowiec from archive NEWTON-XMM data


Magnetic fields in perturbed galaxies a sensitive measure of external influences or

Attempt to summarize

  • We have observed:

  • Magnetic bridges

  • Anomalous arms

  • Compressional ridges

  • Magnetized outflows

  • Intergalactic magnetic fields

Magnetic field as seen in polarization is a very good „preselector” of anomalies to be studied in detail in other domains (X-rays, HI dynamics etc.)


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