Gemini GMOS and WHT SAURON integral-field spectrograph observations of the AGN-driven outflow in NGC 1266

Timothy A. Davis*, Davor Krajnovic, Richard M. McDermid, Martin Bureau, Marc Sarzi, Kristina Nyland, Katherine Alatalo, Estelle Bayet, Leo Blitz, Maxime Bois, Frederic Bournaud, Michele Cappellari, Alison Crocker, Roger L. Davies, P. T. de Zeeuw, Pierre-Alain Duc, Eric Emsellem, Sadegh Khochfar, Harald Kuntschner, Pierre-Yves LablancheRaffaella Morganti, Thorsten Naab, Tom Oosterloo, Nicholas Scott, Paolo Serra, Anne-Marie Weijmans, Lisa M. Young

*Corresponding author for this work

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Abstract

We use the Spectrographic Areal Unit for Research on Optical Nebulae and Gemini Multi-Object Spectrograph integral-field spectrographs to observe the active galactic nucleus (AGN) powered outflow in NGC?1266. This unusual galaxy is relatively nearby (D = 30?Mpc), allowing us to investigate the process of AGN feedback in action. We present maps of the kinematics and line strengths of the ionized gas emission lines Ha, H beta, [O?iii], [O?i], [N?ii] and [S?ii], and report on the detection of sodium D absorption. We use these tracers to explore the structure of the source, derive the ionized and atomic gas kinematics, and investigate the gas excitation and physical conditions. NGC?1266 contains two ionized gas components along most lines of sight, tracing the ongoing outflow and a component closer to the galaxy systemic, the origin of which is unclear. This gas appears to be disturbed by a nascent AGN jet. We confirm that the outflow in NGC?1266 is truly multiphase, containing radio plasma, atomic, molecular and ionized gas and X-ray emitting plasma. The outflow has velocities of up to +/- 900 km s-1 away from the systemic velocity and is very likely to remove significant amount of cold gas from the galaxy. The low-ionization nuclear emission region-like line emission in NGC?1266 is extended, and it likely arises from fast shocks caused by the interaction of the radio jet with the interstellar medium. These shocks have velocities of up to 800 km s-1, which match well with the observed velocity of the outflow. Sodium D equivalent width profiles are used to set constraints on the size and orientation of the outflow. The ionized gas morphology correlates with the nascent radio jets observed in 1.4 and 5 GHz continuum emission, supporting the suggestion that an AGN jet is providing the energy required to drive the outflow.

Original languageEnglish
Pages (from-to)1574-1590
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume426
Issue number2
DOIs
Publication statusPublished - Oct-2012
Externally publishedYes

Keywords

  • ISM: jets and outflows
  • galaxies: elliptical and lenticular, cD
  • galaxies: evolution
  • galaxies: individual: NGC 1266
  • galaxies: ISM
  • galaxies: jets
  • EARLY-TYPE GALAXIES
  • ACTIVE GALACTIC NUCLEUS
  • LENTICULAR GALAXIES
  • ATLAS(3D) PROJECT
  • RADIO GALAXIES
  • BLACK-HOLES
  • MULTIOBJECT SPECTROGRAPH
  • ELLIPTIC GALAXIES
  • NEARBY GALAXIES
  • LINE KINEMATICS

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