Nuclear Water Maser Emission in Centaurus A
Juergen Ott,David S. Meier,Mark McCoy,Alison B. Peck,Violette Impellizzeri,Andreas Brunthaler,Fabian Walter,Philip G. Edwards,Crystal Anderson,Christian Henkel,Ilana Feain,Minnie Mao +11 more
TLDR
In this article, the authors reported the detection of a 22GHz water maser line in the nearest radio galaxy Centaurus A using the Australia Telescope Compact Array (ATCA), which is centered at a velocity of ~960kms-1, which is redshifted by about 400km-1 from the systemic velocity.Abstract:
We report the detection of a 22GHz water maser line in the nearest (D~3.8Mpc) radio galaxy Centaurus A using the Australia Telescope Compact Array (ATCA). The line is centered at a velocity of ~960kms-1, which is redshifted by about 400kms-1 from the systemic velocity. Such an offset, as well as the width of ~120kms-1, could be consistent with either a nuclear maser arising from an accretion disk of the central supermassive black hole, or for a jet maser that is emitted from the material that is shocked near the base of the jet in Centaurus\,A. The best spatial resolution of our ATCA data constrains the origin of the maser feature within 10cm-3, which indicates substantial mass entrainment of surrounding gas into the propagating jet material.read more
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Toward Precision Supermassive Black Hole Masses Using Megamaser Disks
TL;DR: In this article, a search for megamaser disks in near-by galaxies using the Green Bank Telescope (GBT) is described, where they focus on galaxies where they can resolve the gravitational sphere of influence of the black hole and derive a stellar or gas dynamical measurement with optical or NIR observations.
Journal ArticleDOI
HIFI Spectroscopy of H2O Submillimeter Lines in Nuclei of Actively Star-forming Galaxies
L. Liu,L. Liu,L. Liu,Axel Weiß,J. P. Pérez-Beaupuits,J. P. Pérez-Beaupuits,Rolf Güsten,Donghao Liu,Donghao Liu,Yu Gao,Karl M. Menten,P. van der Werf,Frank P. Israel,Andrew I. Harris,Jesús Martín-Pintado,M. A. Requena-Torres,M. A. Requena-Torres,J. Stutzki +17 more
Journal ArticleDOI
Towards Precision Supermassive Black Hole Masses using Megamaser Disks
TL;DR: In this paper, a search for megamasers in nearby galaxies using the Green Bank Telescope (GBT) was described, where the authors focus on galaxies where they believe that they can resolve the gravitational sphere of influence of the black hole and derive a stellar or gas dynamical measurement with optical or NIR observations.
Molecular absorption lines towards the nucleus of Centaurus A
Andreas Eckart,M. Cameron,Reinhard Genzel,James M. Jackson,H. Rothermel,Juergen Stutzki,Gustaf Rydbeck,Tommy Wiklind +7 more
TL;DR: In this paper, the absorption in the lines of (C-12)O, HCO(+), HCN, CN, and CS toward the nuclear continuum source in Centaurus A are reported.
Journal ArticleDOI
HIFI Spectroscopy of ${\rm H_2O}$ submm Lines in Nuclei of Actively Star Forming Galaxies
L. Liu,Axel Weiss,J. P. Pérez-Beaupuits,R. Güsten,Donghao Liu,Yang Gao,Karl M. Menten,P. van der Werf,Frank P. Israel,Andrew I. Harris,Jesús Martín-Pintado,M. A. Requena-Torres,J. Stutzki +12 more
TL;DR: In this article, the authors present a systematic survey of multiple velocity-resolved H$_2$O spectra using Herschel/HIFI towards nine nearby actively star forming galaxies.
References
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Formation of gas discs in merging galaxies
TL;DR: In this article, the authors present simulations of disc formation in mergers of gas-rich galaxies, showing that up to half of the total gas settles into embedded discs; the most massive instances result from encounters in which both galaxies are inclined to the orbital plane.
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TL;DR: In this paper, the first VLBI maps of H2O maser emission (λ 1.3 cm) in the nucleus of the Circinus galaxy, constructed from data obtained with the Australia Telescope Long Baseline Array, were presented.
Journal ArticleDOI
The Australia Telescope Compact Array Broadband Backend (CABB)
Warwick Wilson,R. H. Ferris,P. Axtens,A. Brown,E. Davis,Grant Hampson,M. Leach,Paul Roberts,S. Saunders,B. S. Koribalski,J. L. Caswell,Emil Lenc,Jamie Stevens,Maxim Voronkov,Mark H. Wieringa,Kate J. Brooks,Philip G. Edwards,Ron Ekers,B. Emonts,Luke Hindson,Luke Hindson,Simon Johnston,Sarah T. Maddison,Elizabeth K. Mahony,Elizabeth K. Mahony,Siddharth Malu,Marcella Massardi,Minnie Mao,Minnie Mao,David McConnell,Ray P. Norris,Dominic Schnitzeler,Ravi Subrahmanyan,James Urquhart,Mark Thompson,R. M. Wark +35 more
TL;DR: The Compact Array Broadband Backend (CABB) as discussed by the authors is an extension of the Australia Telescope Compact Array (ATCA) with 16-fold increase in observing bandwidth, from 2 x 128 MHz to 2 x 2048 MHz, high bit sampling, and addition of 16 zoom windows (each divided into a further 2048 channels) provide major improvements for all ATCA observations.
Journal ArticleDOI
The Australia Telescope Compact Array Broad-band Backend: description and first results
Warwick Wilson,R. H. Ferris,P. Axtens,A. Brown,E. Davis,Grant Hampson,M. Leach,Paul Roberts,S. Saunders,Bärbel S. Koribalski,J. L. Caswell,Emil Lenc,Jamie Stevens,Maxim Voronkov,Mark H. Wieringa,Kate J. Brooks,Philip G. Edwards,Ron Ekers,B. Emonts,Luke Hindson,Luke Hindson,Simon Johnston,Sarah T. Maddison,Elizabeth K. Mahony,Elizabeth K. Mahony,Siddharth Malu,Marcella Massardi,Minnie Mao,Minnie Mao,David McConnell,Ray P. Norris,Dominic Schnitzeler,Ravi Subrahmanyan,James Urquhart,Mark Thompson,R. M. Wark +35 more
TL;DR: The Compact Array Broadband Backend (CABB) as mentioned in this paper has been used to improve the performance of the Australia Telescope Compact Array (ATCA) with a 16-fold increase in observing bandwidth, from 2 в 128 to 2 ǫ 2048 MHz.
Journal ArticleDOI
Formation of gas disks in merging galaxies
TL;DR: In this paper, the authors present simulations of disk formation in mergers of gas-rich galaxies and show that up to half of the total gas settles into embedded disks; the most massive instances result from encounters in which both galaxies are inclined to the orbital plane.