Infrared interferometry and AGNs: Parsec-scale disks and dusty outflows

The "torus" is the central element of the most popular theory unifying various classes of AGNs, but it is usually described as "putative" because it has not been imaged yet. Since it is too small to be resolved with single-dish telescopes, one can only make indirect assumptions about its structure using models. Using infrared interferometry, however, we were able to resolve the circum-nuclear dust distributions for several nearby AGNs and achieved constraints on some further two dozen sources. We discovered circum-nuclear dust on parsec scales in all sources and, in two nearby sources, were able to dissect this dust into two distinct components. The compact component, a very thin disk, appears to be connected to the maser disk and the extended one, which is responsible for most of the mid-IR flux, is oriented perpendicularly to the circum-nuclear gas disks. What may come as a surprise when having in mind the standard unification cartoon actually connects well to observations on larger scales. Optically thin dust in the polar region, perhaps driven by a disk wind, could solve both the scale height problem of the torus and explain the missing anisotropy in the mid-IR − X-ray relation.

[1]  G. Perrin,et al.  A new analysis of the nucleus of NGC 1068 with MIDI observations , 2005, astro-ph/0512560.

[2]  Paul S. Smith,et al.  UNOBSCURED TYPE 2 ACTIVE GALACTIC NUCLEI , 2010 .

[3]  S. Veilleux,et al.  INSIGHTS ON THE DUSTY TORUS AND NEUTRAL TORUS FROM OPTICAL AND X-RAY OBSCURATION IN A COMPLETE VOLUME LIMITED HARD X-RAY AGN SAMPLE , 2015, 1505.00536.

[4]  Walter Jaffe,et al.  Resolving the obscuring torus in NGC 1068 with the power of infrared interferometry: revealing the inner funnel of dust , 2009, 0901.1306.

[5]  Huub J. A. Rottgering,et al.  Resolving the Nucleus of Centaurus A at Mid-Infrared Wavelengths , 2010, Publications of the Astronomical Society of Australia.

[6]  George H. Rieke,et al.  Low-luminosity and obscured seyfert nuclei in nearby galaxies , 1995 .

[7]  Heidelberg,et al.  Diffraction-limited 76mas speckle masking observations of the core of NGC 1068 with the SAO 6m telescope ? , 1997, astro-ph/9711254.

[8]  H. Netzer.  Revisiting the Unified Model of Active Galactic Nuclei , 2015, 1505.00811.

[9]  A. Sternberg,et al.  Obscuration in active galactic nuclei: near-infrared luminosity relations and dust colors , 2015, 1504.01104.

[10]  Heidelberg,et al.  Resolving the innermost parsec of Centaurus A at mid-infrared wavelengths , 2007, 0707.0177.

[11]  K. Enya,et al.  Reverberation Measurements of the Inner Radius of the Dust Torus in Nearby Seyfert 1 Galaxies , 2005, astro-ph/0511697.

[12]  Gerd Weigelt,et al.  A diversity of dusty AGN tori - Data release for the VLTI/MIDI AGN Large Program and first results for 23 galaxies , 2013, 1307.2068.

[13]  Francoise Delplancke,et al.  New horizons for VLTI 10 micron interferometry: first scientific measurements with external PRIMA fringe tracking , 2012, Other Conferences.

[14]  S. Horiuchi,et al.  SUBMILLIMETER H2O MASER IN CIRCINUS GALAXY—A NEW PROBE FOR THE CIRCUMNUCLEAR REGION OF ACTIVE GALACTIC NUCLEI , 2013, 1305.0076.

[15]  O. Shemmer,et al.  STAR FORMATION BLACK HOLE GROWTH AND DUSTY TORI IN THE MOST LUMINOUS AGNS AT Z = 2–3.5 , 2015, 1511.07876.

[16]  G. Weigelt,et al.  VLTI/VINCI observations of the nucleus of NGC 1068 using the adaptive optics system MACAO , 2004 .

[17]  W. Duschl,et al.  Resolving the mid-infrared cores of local Seyferts , 2009, 0902.2777.

[18]  Uwe Graser,et al.  Parsec-scale dust distributions in Seyfert galaxies Results of the MIDI AGN snapshot survey , 2009, 0903.4892.

[19]  Julian H. Krolik,et al.  Molecular tori in Seyfert galaxies - Feeding the monster and hiding it , 1988 .

[20]  Julian H. Krolik,et al.  An X-ray heated wind in NGC 1068 , 1986 .

[21]  Heidelberg,et al.  The dusty torus in the Circinus galaxy: a dense disk and the torus funnel , 2013, 1312.4534.

[22]  M. Elitzur.  ON THE UNIFICATION OF ACTIVE GALACTIC NUCLEI , 2012, 1202.1776.

[23]  Andrea M. Ghez,et al.  LUMINOSITY-VARIATION INDEPENDENT LOCATION OF THE CIRCUM-NUCLEAR, HOT DUST IN NGC 4151 , 2010, 1003.4757.

[24]  Takayuki Kotani,et al.  Exploring the inner region of type 1 AGNs with the Keck interferometer , 2009, 0911.0666.

[25]  M. Schoeller,et al.  The central dusty torus in the active nucleus of NGC 1068 , 2004, Nature.

[26]  Makoto Kishimoto,et al.  A dust-parallax distance of 19 megaparsecs to the supermassive black hole in NGC 4151 , 2014, Nature.

[27]  R. Maiolino,et al.  The relation between AGN hard X-ray emission and mid-infrared continuum from ISO spectra: Scatter and unification aspects , , 2004, astro-ph/0402082.

[28]  Germany,et al.  On the size-luminosity relation of AGN dust tori in the mid-infrared , 2011, 1105.4875.

[29]  B. Groves,et al.  Extended Silicate Dust Emission in Palomar-Green QSOs , 2008, 0801.4637.

[30]  S. O. Physics,et al.  The subarcsecond mid-infrared view of local active galactic nuclei – I. The N- and Q-band imaging atlas , 2013, 1310.2770.

[31]  Rainer Wilhelm,et al.  VINCI, the VLTI commissioning instrument: status after one year of operations at Paranal , 2003, SPIE Astronomical Telescopes + Instrumentation.

[32]  Konrad Tristram,et al.  PARSEC-SCALE DUST EMISSION FROM THE POLAR REGION IN THE TYPE 2 NUCLEUS OF NGC 424 , 2012, 1206.4307.

[33]  F. Millour,et al.  VLTI/AMBER observations of the Seyfert nucleus of NGC 3783 , 2012, 1204.6122.

[34]  W. Keel.  Inclination effects on the recognition of Seyfert galaxies , 1980 .

[35]  M. Robberto,et al.  The VLTI/MIDI survey of massive young stellar objects: Sounding the inner regions around intermediate-and high-mass young stars using mid-infrared interferometry , 2013, 1308.4282.

[36]  Chris Simpson,et al.  Hubble Space Telescope Imaging of the Circinus Galaxy , 2000, astro-ph/0006147.

[37]  J.-U. Pott,et al.  First results using PRIMA FSU as a fringe tracker for MIDI , 2010, Astronomical Telescopes + Instrumentation.

[38]  Gerd Weigelt,et al.  The innermost dusty structure in active galactic nuclei as probed by the Keck interferometer , 2010, 1012.5359.

[39]  Konrad R. W. Tristram.  Mid-infrared interferometry of nearby Active Galactic Nuclei , 2007 .

[40]  A. Ramos,et al.  Upholding the unified model for active galactic nuclei: VLT/FORS2 spectropolarimetry of Seyfert 2 galaxies , 2015, 1606.02204.

[41]  G. Weigelt,et al.  Probing the dusty environment of the Seyfert 1 nucleus in NGC 3783 with MIDI/VLTI interferometry , 2008, 0806.0531.

[42]  Andreas Glindemann,et al.  VINCI: the VLT Interferometer commissioning instrument , 2000, Astronomical Telescopes and Instrumentation.

[43]  M.Swain,et al.  Interferometer Observations of Subparsec-Scale Infrared Emission in the Nucleus of NGC 4151 , 2003 .

[44]  G. Vasishta,et al.  Performance and Verification of the Keck Interferometer Fringe Detection and Tracking System , 2003 .

[45]  J. A. Fern'andez-Ontiveros,et al.  The central parsecs of active galactic nuclei: challenges to the torus , 2014, 1405.5653.

[46]  Sebastiano Ligori,et al.  Mid-infrared sizes of circumstellar disks around Herbig Ae/Be stars measured with MIDI on the VLTI , 2004 .

[47]  Gerd Weigelt,et al.  Possible evidence for a common radial structure in nearby AGN tori , 2008, 0812.1964.

[48]  P. Gandhi,et al.  THE SUBARCSECOND MID-INFRARED VIEW OF LOCAL ACTIVE GALACTIC NUCLEI. III. POLAR DUST EMISSION , 2016, 1603.02710.

[49]  Rafael Millan-Gabet,et al.  EVIDENCE FOR A RECEDING DUST SUBLIMATION REGION AROUND A SUPERMASSIVE BLACK HOLE , 2013, 1308.6517.

[50]  G. Rieke,et al.  Unobscured Type 2 AGNs , 2010, 1004.2077.

[51]  Observatoire de la Cote d'Azur,et al.  Resolving the complex structure of the dust torus in the active nucleus of the Circinus galaxy , 2007, 0709.0209.

[52]  G. Neugebauer,et al.  Ultraluminous infrared galaxies and the origin of quasars , 1988 .

[53]  P. Hopkins,et al.  A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies. I. Galaxy Mergers and Quasar Activity , 2007, 0706.1243.

[54]  Max-Planck-Institut fur Radioastronomie,et al.  Revealing the large nuclear dust structures in NGC 1068 with MIDI/VLTI , 2014, 1401.3248.

[55]  Astronomy,et al.  THE RADIUS–LUMINOSITY RELATIONSHIP FOR ACTIVE GALACTIC NUCLEI: THE EFFECT OF HOST-GALAXY STARLIGHT ON LUMINOSITY MEASUREMENTS. II. THE FULL SAMPLE OF REVERBERATION-MAPPED AGNs , 2008, 0812.2283.

[56]  Florentin Millour,et al.  Mapping the radial structure of AGN tori , 2011, 1110.4290.

[57]  Sebastiano Ligori,et al.  Ten-micron instrument MIDI: getting ready for observations on the VLTI , 2003, SPIE Astronomical Telescopes + Instrumentation.

[58]  Gerd Weigelt,et al.  Diffraction-limited bispectrum speckle interferometry of the nuclear region of the Seyfert galaxy NGC 1068 in the H and K' bands , 2004 .

[59]  J. Miller,et al.  Spectropolarimetry and the nature of NGC 1068 , 1985 .

[60]  Walter Jaffe,et al.  DUST EMISSION FROM A PARSEC-SCALE STRUCTURE IN THE SEYFERT 1 NUCLEUS OF NGC 4151 , 2009, 0909.5191.

[61]  A. Lawrence,et al.  MISALIGNED DISKS AS OBSCURERS IN ACTIVE GALAXIES , 2010 .

[62]  K. Meisenheimer,et al.  Mid-infrared interferometry of 23 AGN tori: On the significance of polar-elongated emission , 2016, 1602.05592.

[63]  F. Delplancke,et al.  Report on the Workshop Ten Years of VLTI: From First Fringes to Core Science , 2012 .

[64]  MPE,et al.  DUST IN THE POLAR REGION AS A MAJOR CONTRIBUTOR TO THE INFRARED EMISSION OF ACTIVE GALACTIC NUCLEI , 2013, 1306.4312.

[65]  N. L'opez-Gonzaga,et al.  Mid-infrared interferometry of Seyfert galaxies: Challenging the Standard Model , 2016, 1602.09131.

[66]  D. M. Crenshaw,et al.  DETERMINING INCLINATIONS OF ACTIVE GALACTIC NUCLEI VIA THEIR NARROW-LINE REGION KINEMATICS. I. OBSERVATIONAL RESULTS* , 2013 .

[67]  W. Duschl,et al.  Mid-infrared properties of nearby low-luminosity AGN at high angular resolution , 2011, 1109.4873.

[68]  W. Duschl,et al.  The subarcsecond mid-infrared view of local active galactic nuclei – II. The mid-infrared–X-ray correlation , 2015, 1508.05065.

[69]  Frantz Martinache,et al.  UvA-DARE ( Digital Academic Repository ) An Overview of the MATISSE Instrument — Science , Concept and Current Status , 2014 .

[70]  N. A. Levenson,et al.  TESTING THE UNIFICATION MODEL FOR ACTIVE GALACTIC NUCLEI IN THE INFRARED: ARE THE OBSCURING TORI OF TYPE 1 AND 2 SEYFERTS DIFFERENT? , 2011, 1101.3335.

[71]  Gerd Weigelt,et al.  VLTI/AMBER differential interferometry of the broad-line region of the quasar 3C273 , 2014, Other Conferences.

[72]  David Mouillet,et al.  AMBER : Instrument description and first astrophysical results Special feature AMBER , the near-infrared spectro-interferometric three-telescope VLTI instrument , 2007 .

[73]  R. Siebenmorgen,et al.  Subarcsecond mid-infrared imaging of warm dust in the narrow-line region of NGC 1068 , 1993 .