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Cited by 112Astrophysical Phenomena and ObservationsGalaxies: Formation, Evolution, PhenomenaAstrophysics and Star Formation Studies

Water Maser Emission and the Parsec‐Scale Jet in NGC 3079

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Trotter, Adam S., Greenhill, Lincoln J., Moran, James M., Reid, Mark J., Irwin, Judith A., Lo, Kwok‐Yung·1998·The Astrophysical Journal
DOI 10.1086/305335
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Abstract

We have conducted VLBI observations at subparsec resolution of water maser and radio continuum emission in the nucleus of the nearby active galaxy NGC 3079. The 22 GHz maser emission arises in compact (~0.01 pc at a distance of 16 Mpc) clumps, distributed over ~2 pc along an axis that is approximately aligned with the major axis of the galactic disk. The Doppler velocities of the water maser clumps are consistent with their lying in the inner parsec of a molecular disk with a binding mass ~10 6 M ☉ , rotating in the same sense as the edge-on kiloparsec-scale molecular disk observed in CO emission. However, the velocity field has a significant nonrotational component, which may indicate supersonic turbulence in the disk. This distribution is markedly different from that of water masers in NGC 4258, which trace a nearly perfectly Keplerian rotating disk with a binding mass of 3.5 × 10 7 M ☉ . The 22 GHz radio continuum emission in NGC 3079 is dominated by a compact (<0.1 pc) source that is offset 0.5 pc to the west of the brightest maser feature. No bright maser emission is coincident with a detected compact continuum source. This suggests that the large apparent luminosity of the maser is not caused by beamed amplification of high brightness temperature continuum emission. At 8 and 5 GHz, we confirm the presence of two compact continuum sources with a projected separation of 1.5 pc. Both have inverted spectra between 5 and 8 GHz and steep spectra between 8 and 22 GHz. NGC 3079 may be a nearby, low-luminosity example of the class of compact symmetric gigahertz-peaked spectrum radio sources. We detected a third continuum component that lies along the same axis as the other two, strongly suggesting that this galaxy possesses a nuclear jet. Faint maser emission was detected near this axis, which may indicate a second population of masers associated with the jet.

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Research works printed but not linked: 6

  1. P. J., Claussen, M. J., Braatz, J. A., Wilson, A. S., & Henkel, C. Diamond, 1998, in IAU Colloq. 164, Radio Emission from Galactic and Extra- galactic Compact Sources, ed. G. B. Taylor, J. M. Wrobel, & J. A. Zensus (San Francisco : ASP), in press M. A. 1995, Ap&SS, 233, Dopita, 215
  2. L. J. 1990, Ph.D. thesis, Harvard Greenhill, Univ.
  3. J. R. 1997, Ph.D. thesis, Harvard Herrnstein, Univ.
  4. A. C. S., Taylor, G. B., Pearson, T. J., & Wilkinson, P. N. 1996, Readhead, ApJ, 460, 634
  5. M. J., & Moran, J. M. 1988, in Galactic and Extragalactic Radio Reid, Astronomy, ed. G. L. Verschuur & K. I. Kellermann (Berlin : Springer), 255
  6. S., Inoue, M., Nakai, N., Shibata, K. M., Kameno, S., Migenes, V., & Satoh, Diamond, P. J. 1998, in IAU Colloq. 164, Radio Emission from Galactic and Extragalactic Compact Sources, ed. G. B. Taylor, J. M. Wrobel, & J. A. Zensus (San Francisco : ASP), in press Y., & Irwin, J. A. 1992, PASJ, 44, Sofue, 353

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Authors
Trotter, A. S., Greenhill, L. J., Moran, J. M., Reid, M. J., Irwin, J. A., & Lo, K.
Affiliations
  • Center for Astrophysics Harvard & Smithsonian (US)
  • Queen's University (CA)
  • University of Illinois Urbana-Champaign (US)
ORCID
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
1998-03-10
Volume
495
Issue
2
Pages
740-748
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.1086/305335
OpenAlex
W2095642765
Cited by
112
References
44
Citations by year
2025: 2 · 2024: 4 · 2023: 2 · 2022: 3 · 2021: 1 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 6 · 2015: 4 · 2014: 3 · 2013: 3 · 2012: 4
FWCI
6.26
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Keywords
NGC 3079, water masers, parsec-scale jets, active galactic nuclei, molecular disk, Doppler velocity, supersonic turbulence, radio continuum emission

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