7 papers · 1 filter
First Detection of 12CO (1--0) Emission from Two Narrow-Line Seyfert 1 Galaxies
T. Kawaguchi, K. Nakanishi, K. Kohno +2
In order to investigate how the growth of galactic bulges progresses with the growth of central black holes (BHs), we observed molecular gas (fuel for the coming star formation) in…
Formation of intermediate-mass black holes as primordial black holes in the inflationary cosmology with running spectral index
Toshihiro Kawaguchi, Masahiro Kawasaki, Tsutomu Takayama +2
Formation of primordial black holes (PBHs) on astrophysical mass scales is a natural consequence of inflationary cosmology if the primordial perturbation spectrum has a large and n…
A Stellar-mass Black Hole in the Ultra-luminous X-ray Source M82 X-1?
Takashi Okajima, Ken Ebisawa, Toshihiro Kawaguchi
We have analyzed the archival XMM-Newton data of the bright Ultra-Luminous X-ray Source (ULX) M82 X-1 with an 105 ksec exposure when the source was in the steady state. Thanks to t…
The Largest Blueshifts of [O III] emission line in Two Narrow-Line Quasars
Kentaro Aoki, Toshihiro Kawaguchi, Kouji Ohta
We have obtained optical intermediate resolution spectra (R = 3000) of the narrow-line quasars DMS 0059-0055 and PG 1543+489. The [O III] emission line in DMS 0059-0055 is blueshif…
The origin of emission and absorption features in Ton S180 Chandra observations
A. Różańska, B. Czerny, A. Siemiginowska +2
We present new interpretation of Ton S180 spectrum obtained by {\it Chandra} Spectrometer (Low Energy Transmission Grating). Several narrow absorption lines and a few emission disk…
A Chandra Observation of the Luminous NLS1 1H 0707-495
Karen M. Leighly, Andrzej A. Zdziarski, Toshihiro Kawaguchi +1
We present preliminary results from a long Chandra HETG observation of the luminous Narrow-line Seyfert 1 galaxy 1H 0707-495. We find a complex X-ray spectrum comprised of a two-co…