Universität zu Köln

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. and Kadler, M. (2019). Accretion disk versus jet orientation in H2O megamaser galaxies. Astron. Astrophys., 624. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. 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). Aims. 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. Methods. We observed a sample of 18 LLAGNs in the 4.8 GHz (6 cm) radio continuum using the Very Long Baseline Array (VLBA) with 3.3-6.5 ms resolution. The sources were selected to show both an edge-on accretion disk revealed by 22 GHz H2O megamaser emission and signatures of a radio jet. Furthermore, the sources were previously detected in 33 GHz radio continuum observations made with the Very Large Array. Results. Five out of 18 galaxies observed were detected at 8 sigma 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 degrees 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 5 GHz VLBA radio continuum and the [OIII] luminosity and also with the H2O maser disk's inner radius.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kamali, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Henkel, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Koyama, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuo, C. Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Condon, J. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brunthaler, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reid, M. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Greene, J. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Menten, K. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Impellizzeri, C. M., V UNSPECIFIED UNSPECIFIED UNSPECIFIED Braatz, J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Litzinger, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kadler, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-151024
DOI:	10.1051/0004-6361/201834600
Journal or Publication Title:	Astron. Astrophys.
Volume:	624
Date:	2019
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language BLACK-HOLE ACTIVITY; FUNDAMENTAL PLANE; X-RAY; MASER EMISSION; RADIO; GAS; DISTANCE; ENGINE; REGION; SAMPLE Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15102