2 edition of The nature of the dense obscuring material in the nucleus of NGC 1068 found in the catalog.
The nature of the dense obscuring material in the nucleus of NGC 1068
Published
1994
by Max-Planck-Institut fur Extraterrestrische Physik, National Aeronautics and Space Administration, Ames Research Center, National Technical Information Service, distributor in Garching, Germany, [Moffett Field, Calif, Springfield, Va
.
Written in English
Edition Notes
| Statement | L. J. Tacconi ... [et al.]. |
| Series | NASA technical memorandum -- 110548. |
| Contributions | Tacconi, L. J., Ames Research Center. |
| The Physical Object | |
|---|---|
| Format | Microform |
| Pagination | 1 v. |
| ID Numbers | |
| Open Library | OL15413550M |
The galaxy NGC with an active supermassive black hole at its nucleus. Astronomers studying similar extreme galaxies in the infrared have found that in many cases material obscuring the. Hard X-ray observations of NGC indicate large obscuration to the nucleus (Iwasawa et al. ;Mattetal. ; Colbert et al. ) by an intervening medium with a col-umn density possibly exceeding N H > cm−2 (Mattetal. ). Interferometric mid-IR observations of NGC iden-tify a parsec-scale structure of hot dust that, along.
Unification Models of Active Galactic Nuclei postulate that all the observed differences between type 1 and type 2 objects are due to orientation effects with respect to the line of sight to the observer. The key ingredient of these models is the obscuring medium, historically envisaged as a toroidal structure on a parsec scale. However, many results obtained in the last few years . The X-ray image displays clear emission from the ionization cone emanating from the nucleus of NGC ; however, we note that there is an obvious dimmed area at the center of the image. This dimmed area matches well with the central core of our CO(3–2) image, suggesting that the obscuring material of the X-rays is closely related to the.
NGC (M77) is the closest and brightest example of a Seyfert 2 galaxy. Many active galactic nuclei (AGN), including NGC , have apparently conical or biconical high-excitation emission line structures extending from the position of the nucleus (e.g., Pogge , Tadhunter & Tsvetanov , Unger et al. ), which are taken as evidence. More recent observations show that NGC is not unique. Although astronomers don't yet understand the nature of a Seyfert galaxy's obscuring ring or disk, light from these galaxies shows evidence that their centers often contain large quantities of intensely heated gas (SN: 4/27/85, p).
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We report high spatial and spectral resolution observations of the distribution, physical parameters, and kinematics of the molecular interstellar medium toward the nucleus of the Seyfert 2 galaxy NGC The data consist of " x " resolution interferometry of the GHz HCN J = 1 - 0 line at 17 km s^-1^ spectral resolution, single-dish observations of Cited by: Get this from a library.
The nature of the dense obscuring material in the nucleus of NGC [L J Tacconi; Ames Research Center.;]. The central few hundred parsecs of NGC contain a system of dense (N(H2) approximately 10(exp 5) cm(exp -3)), warm (T greater than or equal to 70 K) molecular cloud cores.
The low density molecular envelopes have probably been stripped by the nuclear wind and radiation. The nucleus of the galaxy NGC hosts the archetypal example of an obscured AGN.
The popular model for the obscuring medium is a parsec-scale, molecular disk surrounding the AGN 5, perhaps Cited by: Abstract. A growing body of observational data on the near-nuclear ISM obscuring the broad-line region in NGC suggests that the AGN is surrounded by an extensive dusty molecular disk, characterised by a very large scale : Murray Cameron, Linda Tacconi, Markus Blietz, Reinhard Genzel, John W.
Storey. NGC is considered to be the archetypal galaxy, harboring an active galactic nucleus heavily obscured by a dense molecular torus. In the nucleus of NGC lies a megamaser source which enables us to probe the structure and the velocity field of the innermost part of the torus.
Recently, Greenhill et al. () observed the water maser. NGC is a nearby spiral galaxy which harbors the prototypical example of a Seyfert type 2 nucleus.
However, all evidence points to the conclusion that its active nucleus is completely hidden to our view by dense obscuring material. If we could see NGC along an unobscured line of sight it would appear radically different.
This unveils the importance of. SAO/NASA Astrophysics Data System (ADS) Title: The nature of the dense obscuring material in the nucleus of NGC Authors: Tacconi, L. J., Genzel, R., Blietz, M. MOLECULAR GAS STREAMING AND OBSCURING THE ACTIVE NUCLEUS OF NGC F.
M uller S anchez,1 R. Davies,1 R. Genzel,1,2 L. Tacconi, 1 E. Hicks, 1 and S. Friedrich1 RESUMEN Alcanzando resoluciones espaciales hasta dehemos obtenido im agenes de la distribuci on y cinem atica. The majority of the accreting supermassive black holes in the Universe are obscured by large columns of gas and dust 1,2, location and evolution of this obscuring material have been the.
The transient excess can be explained by a temporary decrease of the column density of the obscuring material along the line of sight (from N H ≃ 10 25 cm −2 to N H = ± × 10 24 cm −2), which allows us for the first time to unveil the direct nuclear radiation of the buried active galactic nucleus in NGC and to infer an.
We present spatially-resolved, near-diffraction-limited 10 μm spectra of the nucleus of the Seyfert 2 galaxy NGCobtained with Michelle, the mid-IR imager and spectrometer on the m Gemini North telescope.
The spectra cover the nucleus and the central ″ × ″ of the ionization cones at a spatial resolution of approximately ″ (≈30 parsecs).
The spectra. Molecular Gas Streamers Feeding and Obscuring the Active Nucleus of NGC Article in The Astrophysical Journal (1) January with 16 Reads How we measure 'reads'. We present near-infrared interferometric data on the Seyfert 2 galaxy NGCobtained with the GRAVITY instrument on the European Southern Observatory Very Large Telescope Interferometer.
The extensive baseline coverage from 5 to 60 Mλ allowed us to reconstruct a continuum image of the nucleus with an unrivaled pc resolution in the K-band. We find a. Admitting the uncertainty in the continuum level due to the limited bandwidth to fully cover the hypothesized line width, we found the non-detection of both broad and narrow H26 α emission line towards the nucleus of NGC at the 3σ sensitivity of mJy at dV = 50 km s −1 ( arcsec × arcsec = 26 pc × 22 pc beam).
Note that. tacconi, l. j., genzel, r., blietz, m., cameron, m., harris, a. i., madden, s. the nature of the dense obscuring material in the. In this paper, we explore the nature of the subarcsecond radio components in the Seyfert nucleus of NGC The southernmost component (S) is the most likely candidate for the location of the.
Seyfert nucleus Starburstingdense obscuring torus X-ray irradiated dense obscuring torus Dense molecular material = 「nuclear SB- AGN connection」 e.g. NGC, = 「pure Seyferts」 e.g. NGC,HCO+ is also enhanced due to shocks from SNe HCN is enhanced due to enhanced X-ray flux.
Hydrogen recombination lines at the submillimetre band (submm-RLs) can serve as probes of ionized gas without dust extinction.
One therefore expects to probe the broad line region (BLR) of an obscured (type 2) active galactic nucleus (AGN) with those lines. However, admitting the large uncertainty in the continuum level, here we report on the non-detection of. NGC is one of the brightest and nearest Seyfert 2 galax-ies.
Located at a distance of Mpc, it is unique for the study of the active galactic nucleus (AGN) it harbours. The nucleus of NGC has been well studied in the entire spectrum, from X-rays and UV to radio wavelengths, including the op-tical, near- and mid-infrared wavelength.
SAO/NASA Astrophysics Data System (ADS) Title: The Nature of the Dense Obscuring Material in the Nucleus of NGC Authors: Tacconi, L. J., Cameron, M., Genzel, R.NGC was discovered serendipitously as a Seyfert 2 galaxy in the ASCA GIS, with an absorbing column density of ~ 9 x 10^23 atoms/cm^2.
The entire ASCA spectrum of NGC can be interpreted in terms of reflection from cold gas (Reynolds et al.
MNRASL55), which might be a mechanism for explaining the spectrum of the X-ray background. The American Astronomical Society (AAS), established in and based in Washington, DC, is the major organization of professional astronomers in North America. Its .
