J/A+A/593/A47 Pinpointing the SMBH in NGC1052 (Baczko+, 2016)
A highly magnetized twin-jet base pinpoints a supermassive black hole.
Baczko A.-K., Schulz R., Kadler M., Ros E., Perucho M., Krichbaum T.P.,
Bock M., Bremer M., Grossberger C., Lindqvist M., Lobanov A.P.,
Mannheim K., Marti-Vidal I., Mueller C., Wilms J., Zensus J.A.
<Astron. Astrophys. 593, A47 (2016)>
=2016A&A...593A..47B 2016A&A...593A..47B (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; VLBI
Keywords: magnetic fields - galaxies: active - galaxies: jets -
galaxies: magnetic fields - galaxies: nuclei
Abstract:
Supermassive black holes (SMBH) are essential for the production of
jets in radio-loud active galactic nuclei (AGN). Theoretical models
based on Blandford & Znajek (1977MNRAS.179..433B 1977MNRAS.179..433B) extract the
rotational energy from a Kerr black hole, which could be the case for
NGC1052, to launch these jets. This requires magnetic fields on the
order of 1000G to 10000G. We imaged the vicinity of the SMBH of the
AGN NGC1052 with the Global Millimetre VLBI Array and found a bright
and compact central feature that is smaller than 1.9 light days (100
Schwarzschild radii) in radius. Interpreting this as a blend of the
unresolved jet bases, we derive the magnetic field at 1 Schwarzschild
radius to lie between 200G and ∼83000G consistent with Blandford &
Znajek (1977MNRAS.179..433B 1977MNRAS.179..433B) models.
Description:
The source NGC1052 was observed with the GMVA at 86GHz in Oct. 2004.
One naturally weighted and one uniformly weighted CLEAN-image as
FITS-files (Fig. 1 and 2) and one tapered map with more weight to
short baselines as FITS-file (Fig. 3).
Objects:
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RA (2000) DE Designation(s)
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02 41 04.80 -08 15 20.8 NGC 1052 = LEDA 10175
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 108 3 List of FITS images
fits/* . 3 Individual VLBI FITS images of NGC1052
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 10 F10.7 deg RAdeg Right ascension of center (J2000)
11- 20 F10.7 deg DEdeg Declination of center (J2000)
22- 26 F5.3 mas/pix Scale Scale of the image
28- 30 I3 --- Nx Number of pixels along X-axis
31 A1 --- --- [x]
32- 34 I3 --- Ny Number of pixels along Y-axis
36- 37 I2 GHz Freq Frequency
39- 48 A10 "date" ObsDate Observation date
50- 53 I4 Kibyte size Size of FITS file
55- 65 A11 --- FileName Name of FITS file in subdirectory fits
67-108 A42 --- Title Title of the file
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Acknowledgements:
Anne-Kathrin Baczko, baczko(at)mpifr-bonn.mpg.de
(End) Patricia Vannier [CDS] 08-Jun-2016