2001A&A...376L..35S


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST13:11:13

2001A&A...376L..35S - Astronomy and Astrophysics, volume 376, L35-38 (2001/9-4)

Mid infrared polarisation of Ultraluminous Infrared Galaxies.

SIEBENMORGEN R. and EFSTATHIOU A.

Abstract (from CDS):

The mid infrared polarisation properties of four Ultraluminous Infrared Galaxies (ULIRGs) have been investigated by broad band filter observations with the ISOCAM instrument on board the Infrared Space Observatory (ISO). The wavelength region from 5 to 18µm was selected where the emission from the putative torus peaks. We report detection of polarisation for all ULIRGs studied. The fractional polarisation ranges from ∼3% up to 8%. The highest polarisation is recorded in Mrk 231 which has a clear AGN signature, whereas the lowest is for Arp 220, which is generally thought to be powered predominantly by star formation. We discuss the various mechanisms that could give rise to the polarisation and conclude that the most likely interpretation is that it is due to magnetically aligned elongated dust grains. This is the same mechanism believed to be operating in a number of galactic sources. The position angle of polarisation could give the projected magnetic field direction and therefore constrain models for the formation of the tori.

Abstract Copyright:

Journal keyword(s): polarisation - infrared: galaxies - galaxies: ISM - galaxies: individual: Mrk 231, Arp 220, IRAS 15250+3609, Mrk 273

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4192 2
2 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 666 3
3 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5445 6
4 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1827 3
5 Mrk 273 Sy2 13 44 42.164 +55 53 13.53   15.68 14.91     ~ 840 3
6 2MASX J15265942+3558372 LIN 15 26 59.442 +35 58 37.01   15.61       ~ 248 1
7 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2739 4

    Equat.    Gal    SGal    Ecl

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2021.04.18-13:11:13

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