The Nuclear Region of the Seyfert 2 Galaxy NGC 3079

Sawada-Satoh, Satoko; Inoue, Makoto; Shibata, Katsunori M.; Kameno, Seiji; Migenes, V.; Nakai, Naomasa; Diamond, P. J.

doi:10.1093/pasj/52.3.421

Cited by 44 publications

(71 citation statements)

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“…The model proposed by Trotter et al (1998) differs significantly from that proposed by Sawada-Satoh et al (2000). According to these authors, the observed velocity drift of the maser feature at 1190 km s À1 is much larger than the velocity drift of the other maser features and is due to centripetal acceleration.…”

Section: Masermentioning

confidence: 76%

Evidence for a Geometrically Thick Self‐Gravitating Accretion Disk in NGC 3079

Kondratko

Greenhill

Moran

2005

ApJ

142

188

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We have mapped, for the first time, the full velocity extent of the water maser emission in NGC 3079. The largely north-south distribution of emission, aligned with a kiloparsec-scale molecular disk, and the segregation of blueshifted and redshifted emission on the sky are suggestive of a nearly edge-on molecular disk on parsec scales. Positions and line-of-sight velocities of blueshifted and redshifted maser emission are consistent with a central mass of $2 ; 10 6 M enclosed within a radius of $0.4 pc. The corresponding mean mass density of 10 6.8 M pc À3 is suggestive of a central black hole, which is consistent with the detection of hard X-ray excess (20-100 keV) and an Fe K line from the nucleus. Because the rotation curve traced by the maser emission is flat, the mass of the parsec-scale disk is significant with respect to the central mass. Since the velocity dispersion of the maser features does not decrease with radius and constitutes a large fraction of the orbital velocity, the disk is probably thick and flared. The rotation curve and the physical conditions necessary to support maser emission imply a Toomre Q-parameter that is T1. Thus, the disk is most likely clumpy, and we argue that it is probably forming stars. Overall, the accretion disk in NGC 3079 stands in contrast to the compact, thin, warped, differentially rotating disk in the archetypal maser galaxy NGC 4258.We have also mapped radio continuum emission in the vicinity of the disk and identify a new, time-variable, nonthermal component ( E) that is not collinear with the previously imaged putative jet. Based on the large luminosity and the unusually steep spectrum ( < À2:1), we exclude a radio supernova as the progenitor of E. However, because its spectrum is consistent with an aging electron energy distribution, E might be a rapidly cooling remnant, which may indicate that the jet axis wobbles. Alternatively, considering its location, the component might mark a shock in a wide-angle outflow that is interacting with a dense ambient medium. In this context, masers at high latitudes above the disk, mapped in this and previous studies, may be tracing an inward extension of the kiloparsec-scale bipolar wide-angle outflow previously observed along the galactic minor axis.

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Section: Masermentioning

confidence: 76%

Evidence for a Geometrically Thick Self‐Gravitating Accretion Disk in NGC 3079

Kondratko

Greenhill

Moran

2005

ApJ

142

188

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“…This morphology, which is also seen in the X-rays (Fabbiano et al 1992;Dahlem et al 1998;Pietsch et al 1998) and in optical line emission (Ford et al 1986) has been interpreted as an outflow from a compact central engine that interacts with the dense gas in the nuclear environment (see discussion in Filippenko & Sargent 1992). The hypothesis that this outflow may be driven by accretion onto a supermassive black hole is reinforced by high-resolution VLA and global VLBI observations (e.g., Irwin & Seaquist 1988;Trotter et al 1998;Sawada-Satoh et al 2000) that reveal several aligned sources thought to be features of a nuclear jet.…”

Section: Ngc 3079mentioning

confidence: 85%

“…The weak extended emission that we observe Southeast of B, but which is not well constrained by our data, may be associated with components "A" and "C" as seen in the previous studies. Based on their spectra, the multi-component nature, and the position of the extended structure, Trotter et al (1998) and Sawada-Satoh et al (2000) argue that A and C can be identified with the fading and/or expanding components in a radio jet.…”

Section: Ngc 3079mentioning

confidence: 99%

Light-year scale radio cores in four LINER galaxies

Filho¹,

Barthel²,

2002

A&A

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“…( < ∼ 4.0 km s −1 yr −1 ; Nakai et al 1995;Baan & Haschick 1996;Trotter et al 1998;Satoh et al 1999;Sawada-Satoh et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Red-shifted H₂O emission in NGC 3079: More evidence for a pc-scale circumnuclear torus?

Hagiwara

Henkel

Sherwood

et al. 2002

A&A

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Abstract.Using the Effelsberg 100-m telescope, sensitive measurements of the H2O megamaser in NGC 3079 are presented. During 2000-2001, "high velocity" features are seen that are red-shifted up to 225 km s −1 with respect to the systemic velocity of the galaxy (VLSR ∼ 1120 km s −1 ). Symmetrically bracketing the systemic velocity, the H2O emission covers a velocity range of ∼450 km s −1 with only one potential narrow gap (∼20 km s −1 ) near the systemic velocity itself. Velocity drifts of individual components are not convincingly detected. It is shown that the presence of red-shifted emission and the absence of detectable velocity drifts are not inconsistent with the existence of a rotating circumnuclear maser disk at the very center of the galaxy. Significant differences in the overall line profile compared to NGC 4258 and a complex morphology of the radio continuum leave, however, space for scepticism.

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The Nuclear Region of the Seyfert 2 Galaxy NGC 3079

Cited by 44 publications

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Evidence for a Geometrically Thick Self‐Gravitating Accretion Disk in NGC 3079

Evidence for a Geometrically Thick Self‐Gravitating Accretion Disk in NGC 3079

Light-year scale radio cores in four LINER galaxies

Red-shifted H₂O emission in NGC 3079: More evidence for a pc-scale circumnuclear torus?

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The Nuclear Region of the Seyfert 2 Galaxy NGC 3079

Cited by 44 publications

References 0 publications

Evidence for a Geometrically Thick Self‐Gravitating Accretion Disk in NGC 3079

Evidence for a Geometrically Thick Self‐Gravitating Accretion Disk in NGC 3079

Light-year scale radio cores in four LINER galaxies

Red-shifted H2O emission in NGC 3079: More evidence for a pc-scale circumnuclear torus?

Contact Info

Product

Resources

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Red-shifted H₂O emission in NGC 3079: More evidence for a pc-scale circumnuclear torus?