J/A+A/624/A42 H2O megamaser galaxies radio continuum 5GHz data (Kamali+, 2019)
Accretion disk versus jet orientation in H2O megamaser galaxies.
Kamali F., Henkel C., Koyama S., Kuo C.Y., Condon J.J., Brunthaler A.,
Reid M.J., Greene J.E., Menten K.M., Impellizzeri C.M.V., Braatz J.A.,
Litzinger E., Kadler M.
<Astron. Astrophys. 624, A42 (2019)>
=2019A&A...624A..42K 2019A&A...624A..42K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, Seyfert ; Radio continuum ; Galaxies, radio
Keywords: galaxies: active - galaxies: jets - galaxies: ISM - galaxies: nuclei -
galaxies: Seyfert - radio continuum: galaxies
Abstract:
An essential part of the paradigm describing active galactic nuclei is
the alignment between the radio jet and the associated rotation axis
of the sub-pc accretion disks. Because of the small linear and angular
scales involved, this alignment has not yet been checked in a
sufficient number of low luminosity active galactic nuclei (LLAGNs).
The project examines the validity of this paradigm by measuring the
radio continuum on the same physical scale as the accretion disks to
investigate any possible connection between these disks and the radio
continuum.
We observed a sample of 18 LLAGNs in the 4.8GHz (6cm) radio continuum
using the Very Long Baseline Array (VLBA) with 3.3-6.5ms resolution.
The sources were selected to show both an edge-on accretion disk
revealed by 22GHz H2O megamaser emission and signatures of a radio
jet. Furthermore, the sources were previously detected in 33GHz radio
continuum observations made with the Very Large Array.
Five out of 18 galaxies observed were detected at 8σ or higher
levels (Mrk 0001, Mrk 1210, Mrk 1419, NGC 2273, and UGC 3193). While
these five sources are known to have maser disks, four of them exhibit
a maser disk with known orientation. For all four of these sources,
the radio continuum is misaligned relative to the rotation axis of the
maser disk, but with a 99.1% confidence level, the orientations are
not random and are confined to a cone within 32° of the maser
disk's normal. Among the four sources the misalignment of the radio
continuum with respect to the normal vector to the maser disk is
smaller when the inner radius of the maser disk is larger.
Furthermore, a correlation is observed between the 5GHz VLBA radio
continuum and the [OIII] luminosity and also with the H2O maser
disk's inner radius.
Description:
Radio continuum images of 5 H2O megamaser galaxies observed at 5GHz
using VLBA are presented here. Self phase calibration was applied to
all the images to improve the image qualities.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 91 5 List of fits images
fits/* . 5 Individual fits images
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 27 A8 --- Name Galaxy name
29- 31 I3 --- Nx [512] Number of pixels along X-axis
33- 35 I3 --- Ny [512] Number of pixels along Y-axis
37- 46 A10 "date" Obs.date Observation date
48- 54 F7.5 GHz Freq Observed frequency
56- 59 I4 Kibyte size Size of FITS file
61- 71 A11 --- FileName Name of FITS file, in subdirectory fits
73- 91 A19 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Fateme Kamali, fateme.kamali28(at)gmail.com
(End) Patricia Vannier [CDS] 14-Feb-2019