Ikeda, Shinya, Awaki, Hisamitsu, Terashima, Yuichi
Monte Carlo simulation is one of the best tools to study the complex spectra of Compton-thick AGNs and to figure out the relation between their nuclear structures and X-ray spectra. We have simulated...
Suzaku Observations of Local Ultraluminous Infrared Galaxies (2008)
Teng, Stacy H., Veilleux, Sylvain, Anabuki, Naohisa, Dermer, Charles D., Gallo, Luigi C., Nakagawa, Takao, ...
We report the results from our analysis of {\it Suzaku} XIS (0.5-10 keV) and HXD/PIN (15-40 keV) observations of five well-known local ULIRGs: {\em IRAS} F05189-2524, {\em IRAS} F08572+3915, Mrk 273,...
Reeves, James, Done, Chris, Pounds, Ken, Terashima, Yuichi, Hayashida, Kiyoshi, Anabuki, Naohisa
We present a comparison between the 2001 XMM-Newton and 2005 Suzaku observations of the quasar, PG1211+143 at z=0.0809. Variability is observed in the 7 keV iron K-shell absorption line (at 7.6 keV...
Wide-band spectroscopy of the Compton thick Seyfert 2 galaxy Mrk 3 with Suzaku (2007)
Awaki, Hisamitsu, Anabuki, Naohisa, Fukazawa, Yasuchi, Gallo, Luigi, Ikeda, Shinya, Isobe, Naoki, ...
We obtained a wide-band spectrum of the Compton-thick Seyfert 2 galaxy Mrk 3 with Suzaku. The observed spectrum was clearly resolved into weak, soft power-law emission, a heavily absorbed power-law...
Ueda, Yoshihiro, Eguchi, Satoshi, Terashima, Yuichi, Mushotzky, Richard, Tueller, Jack, Markwardt, Craig, ...
We present the Suzaku broad band observations of two AGNs detected by the Swift/BAT hard X-ray (>15 keV) survey that did not have previous X-ray data, Swift J0601.9-8636 and Swift J0138.6-4001. The...
Murphy, Kendrah D., Yaqoob, Tahir, Terashima, Yuichi
We present the results of a one year monitoring campaign of the Seyfert 1.9 galaxy NGC 2992 with RXTE. Historically, the source has been shown to vary dramatically in 2-10 keV flux over timescales of...
Fe K Line Profile in Low-redshift Quasars: Average Shape and Eddington Ratio Dependence (2007)
Inoue, Hirohiko, Terashima, Yuichi, Ho, Luis C.
We analyze X-ray spectra of 43 Palomar-Green quasars observed with {\it XMM-Newton} in order to investigate their mean Fe K line profile and its dependence on physical properties. The continuum...
Miniutti, Giovanni, Fabian, Andrew C., Anabuki, Naohisa, Crummy, Jamie, Fukazawa, Yasushi, Gallo, Luigi, ...
Revealing the high energy emission from the obscured Seyfert galaxy MCG−5–23–16 with Suzaku (2007)
Reeves, James N., Awaki, Hisamitsu, Dewangan, Gulab C., Fabian, Andy C., Fukazawa, Yasushi, Gallo, Luigi, ...
Probing the disk-jet connection of the radio galaxy 3C 120 observed with Suzaku (2007)
Kataoka, Jun, Reeves, James N., Iwasawa, Kazushi, Markowitz, Alex G., Mushotzky, Richard F., Arimoto, Makoto, ...
Suzaku observation of 1H0707-495: puzzling spectral drop around 7 keV (2007)
Hayashida, Kiyoshi, Anabuki, Naohisa, Gallo, Luigi, Iwasawa, Kazushi, Tanaka, Yasuo, Miniutti, Giovanni, ...
The long Suzaku observation of MCG-6-30-15 (2007)
Miniutti, Giovanni, Fabian, Andrew C., Crummy, Jamie, Larsson, Josefin, Anabuki, Naohisa, Fukazawa, Yasushi, ...
Probing the Disk-jet Connection of the Radio Galaxy 3C120 Observed with Suzaku (2006)
Kataoka, Jun, Reeves, James N., Iwasawa, Kazushi, Markowitz, Alex G., Mushotzky, Richard F., Arimoto, Makoto, ...
Broad line radio galaxies (BLRGs) are a rare type of radio-loud AGN, in which the broad optical permitted emission lines have been detected in addition to the extended jet emission. Here we report on...
Revealing the High Energy Emission from the Obscured Seyfert Galaxy MCG -5-23-16 with Suzaku (2006)
Reeves, James N., Awaki, Hisamitsu, Dewangan, Gulab C., Fabian, Andy C., Fukazawa, Yasushi, Gallo, Luigi, ...
We report on a 100 ks Suzaku observation of the bright, nearby (z=0.008486) Seyfert 1.9 galaxy MCG -5-23-16. The broad-band (0.4-100 keV) X-ray spectrum allows us to determine the nature of the high...
Yaqoob, Tahir, Murphy, Kendrah D., Griffiths, Richard E., Haba, Yoshito, Inoue, Hajime, Itoh, Takeshi, ...
We present detailed time-averaged X-ray spectroscopy in the 0.5--10 keV band of the Seyfert~1.9 galaxy NGC 2992 with the Suzaku X-ray Imaging Spectrometers (XIS). We model the complex continuum in...
Miniutti, Giovanni, Fabian, Andrew C., Anabuki, Naohisa, Crummy, Jamie, Fukazawa, Yasushi, Gallo, Luigi, ...
Suzaku has, for the first time, enabled the hard X-ray variability of the Seyfert 1 galaxy MCG-6-30-15 to be measured. The variability in the 14-45 keV band, which is dominated by a strong reflection...
Terashima, Yuichi, Inoue, Hirohiko, Wilson, Andrew S.
We present the results of a search for optical identifications of ultraluminous X-ray sources (ULXs) in M51 by using mosaic images taken with the Hubble Space Telescope Advanced Camera for Surveys in...
Radiatively Inefficient Accretion Flow in the Nucleus of NGC 1097 (2005)
Nemmen, Rodrigo S., Storchi-Bergmann, Thaisa, Yuan, Feng, Eracleous, Michael, Terashima, Yuichi, Wilson, Andrew S.
We present a model for the accretion flow around the supermassive black hole in the LINER nucleus of NGC 1097 which fits the optical to X-ray spectral energy distribution (SED). The X-ray segment of...
Imanishi, Masatoshi, Terashima, Yuichi
We present X-ray spectra of four ultraluminous infrared galaxies (ULIRGs) with detectable broad near-infrared emission lines produced by active galactic nuclei (AGNs): Mrk 463, PKS 1345+12, IRAS...
X-ray Evidence for a Buried Active Galactic Nucleus in UGC 5101 (2003)
Imanishi, Masatoshi, Terashima, Yuichi, Anabuki, Naohisa, Nakagawa, Takao
We present X-ray observations of the ultraluminous infrared galaxy, UGC 5101, thought to contain a buried active galactic nucleus (AGN) based on observations in other wavebands. We detected an...
The Luminous X-ray Source Population in M51 Observed with Chandra (2003)
Terashima, Yuichi, Wilson, Andrew S.
We present the results of two Chandra observations (separated by 1 year) of the population of X-ray sources in the spiral galaxy M51 (NGC 5194 and NGC 5195). 113 X-ray sources have been detected in...
Detection of the "Active" Nucleus of M32 (2003)
Ho, Luis C., Terashima, Yuichi, Ulvestad, James S.
M32 hosts a 2.5x10^6 solar mass central black hole, but signs of nuclear activity in this galaxy have long eluded detection. We report the first conclusive detection of the nucleus of M32 in X-rays,...
Ho, Luis C., Terashima, Yuichi, Okajima, Takashi
The globular cluster M15 has recently been found to host a possible central black hole with a mass of ~2000 solar masses. A deep, high-resolution Chandra image failed to detect the "nucleus" of the...
Chandra Snapshot Observations of Low-Luminosity AGNs with a Compact Radio Source (2002)
Terashima, Yuichi, Wilson, Andrew S.
The results of Chandra snapshot observations of 11 LINERs (Low-Ionization Nuclear Emission-line Regions), three low-luminosity Seyfert galaxies, and one HII-LINER transition object are presented. Our...
Chandra Snapshot Observations of LINERs with a Compact Radio Core (2002)
Terashima, Yuichi, Wilson, Andrew S.
The results of Chandra snapshot observations of 11 LINERs (Low-Ionization Nuclear Emission-line Regions), three low-luminosity Seyfert galaxies, and one HII-LINER transition object are presented. Our...
X-ray Emission from the Type Ic Supernova 1994I Observed with Chandra (2002)
Immler, Stefan, Wilson, Andrew S., Terashima, Yuichi
We present two high-resolution Chandra X-ray observations of supernova (SN) 1994I which show, for the first time, that the interaction of the blast wave from a Type Ic SN with its surrounding...
Ultraluminous X-ray Sources in M51 (2002)
Terashima, Yuichi, Wilson, Andrew S.
We present the results of Chandra observations of off-nuclear X-ray sources in the spiral galaxy M51 (NGC 5194). 113 X-ray sources have been detected in the field of view and 84 among them project...
Terashima, Yuichi, Iyomoto, Naoko, Ho, Luis C., Ptak, Andrew F.
This paper presents a comprehensive study of the X-ray properties of low-ionization nuclear emission-line regions (LINERs) and low-luminosity Seyfert galaxies based on observations obtained with...
Fe K Emission Lines in Low-luminosity AGNs (2002)
Terashima, Yuichi, Iyomoto, Naoko, Ho, Luis C., Ptak, Andrew F.
We present the results of a systematic analysis of Fe K emission lines in low-luminosity AGNs (LLAGNs) observed with ASCA. We used a sample of LLAGNs with small intrinsic absorption to compare with...
A Chandra X-ray Study of Cygnus A - II. The Nucleus (2001)
Young, Andrew J., Wilson, Andrew S., Terashima, Yuichi, Arnaud, Keith A., Smith, David A.
We report Chandra ACIS and quasi-simultaneous RXTE observations of the nearby, powerful radio galaxy Cygnus A, with the present paper focusing on the properties of the active nucleus. In the Chandra...
A Chandra X-ray Study of Cygnus A - III. The Cluster of Galaxies (2001)
Smith, David A., Wilson, Andrew S., Arnaud, Keith A., Terashima, Yuichi, Young, Andrew J.
The results from a recent Chandra ACIS-S study of the cluster surrounding Cygnus A are presented. We have deprojected the X-ray spectra taken from various elliptical shells in order to derive the run...
A Chandra Observation of M51: Active Nucleus and Nuclear Outflows (2001)
Terashima, Yuichi, Wilson, Andrew S.
We present a Chandra ACIS-S observation of the nuclear region of the nearby spiral galaxy M51 (NGC 5194), which has a low-luminosity Seyfert 2 nucleus. The X-ray image shows the nucleus, southern...
Hard X-ray Emission and the Ionizing Source in LINERs (2000)
Terashima, Yuichi, Ho, Luis C., Ptak, Andrew F.
We report X-ray fluxes in the 2--10 keV band from LINERs (low-ionization nuclear emission-line regions) and low-luminosity Seyfert galaxies obtained with the ASCA satellite. Observed X-ray...
RXTE observation of NGC 6240: a search for the obscured active nucleus (2000)
Ikebe, Yasushi, Leighly, Karen, Tanaka, Yasuo, Nakagawa, Takao, Terashima, Yuichi, Komossa, Stefanie
The wide-band energy spectrum of NGC6240 over the range 0.5-200keV is investigated using the RXTE and ASCA data. The RXTE data provide the spectrum beyond the ASCA range (0.5-10 keV) with significant...
X-ray Properties of the Weak Seyfert 1 Nucleus in NGC 4639 (1999)
Ho, Luis C., Ptak, Andrew, Terashima, Yuichi, Kunieda, Hideyo, Serlemitsos, Peter J., Yaqoob, Tahir, ...
We obtained observations of NGC 4639 with ASCA in order to investigate its mildly active Seyfert 1 nucleus at hard X-ray energies. Koratkar et al. (1995) have previously shown that the nucleus is a...
Detection of an iron K Emission Line from the LINER NGC 4579 (1998)
Terashima, Yuichi, Kunieda, Hideyo, Misaki, Kazutami, Mushotzky, Richard F., Ptak, Andrew F., Reichert, Gail A.
We present the results of an ASCA observation of the LINER NGC 4579. A point-like X-ray source is detected at the nucleus with a 2-10 keV luminosity of 1.5x10^41 ergs/s assuming a distance of 16.8...