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Extended High-Ionization Nuclear Emission-Line Region in the Seyfert Galaxy NGC 4051
Tohru Nagao, Takashi Murayama, Yoshiaki Taniguchi +1
We present an optical spectroscopic analysis of the well-known Seyfert galaxy NGC 4051. The high-ionization nuclear emission-line region (HINER) traced by [Fe X]6374 is found to be…
What Are Narrow-Line Seyfert 1 Galaxies ?: Toward A Viewing-Angle-Dependent Unified Model for Seyfert Galaxies
Yoshiaki Taniguchi, Takashi Murayama, Tohru Nagao
Recently growing evidence has been accumulated that the NLS1s are viewed from nearly pole-on viewing angles. However, there has been no theoretical model which explains the followi…
Globular cluster formation triggered by the initial starburst in galaxy formation
Yoshiaki Taniguchi, Neil Trentham, Satoru Ikeuchi
We propose and investigate a new formation mechanism for globular clusters in which they form within molecular clouds that are formed in the shocked regions created by galactic win…
New Mid-Infrared Diagnostic of the Dusty Torus Model for Seyfert Nuclei
Takashi Murayama, Hideaki Mouri, Yoshiaki Taniguchi
We propose a new diagnostic of the ``dusty torus'' model for Seyfert nuclei. Dust grains in the torus are heated by the nuclear continuum, and reradiate mostly in the mid-infrared…
The Electron Scattering Region in Seyfert Nuclei
Yoshiaki Taniguchi, Naohisa Anabuki
The electron scattering region (ESR) is one of important ingredients in Seyfert nuclei because it makes possible to observe the hidden broad line region (hereafter HBLR) in some ty…
The Minor-Merger Driven Nuclear Activity in Seyfert Galaxies: A Step toward the Simple Unified Formation Mechanism of Active Galactic Nuclei in the Local Universe
Yoshiaki Taniguchi
Seyfert nuclei are typical active galactic nuclei (AGNs) in the local universe, which are thought to be powered by gas accretion onto a supermassive black hole (SMBH). The dynamica…
13CO(J=1-0) Depression in Luminous Starburst Mergers, Revisited
Yoshiaki Taniguchi, Youichi Ohyama, D. B. Sanders
It is known that merging galaxies with luminous starbursts and high far-infrared luminosities tend to have higher integrated line intensity…
Redshifts of Galaxies Around Arp 220 and Serendipitous Discovery of Three Star-Forming Dwarf Galaxies at Redshift 0.5
Youichi Ohyama, Yoshiaki Taniguchi, J. E. Hibbard +1
We present redshift measurements of four faint galaxies around the archetypal ultraluminous infrared galaxy Arp 220. These galaxies have significantly higher redshifts ( 0.…
Formation of Quasar Nuclei in the Heart of Ultraluminous Infrared Galaxies
Yoshiaki Taniguchi, Satoru, Ikeuchi +1
We investigate whether or not a supermassive black hole (SMBH) with mass can be made in the heart of ultraluminous infrared galaxies (ULIGs) during the cours…