Search

Your search keyword '"Izumi, Takuma"' showing total 393 results
Start Over Author "Izumi, Takuma"
393 results on '"Izumi, Takuma"'

151. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z = 6.1292

Author

Onoue, Masafusa, primary, Matsuoka, Yoshiki, additional, Kashikawa, Nobunari, additional, Strauss, Michael A., additional, Iwasawa, Kazushi, additional, Izumi, Takuma, additional, Nagao, Tohru, additional, Asami, Naoko, additional, Fujimoto, Seiji, additional, Harikane, Yuichi, additional, Hashimoto, Takuya, additional, Imanishi, Masatoshi, additional, Lee, Chien-Hsiu, additional, Shibuya, Takatoshi, additional, and Toba, Yoshiki, additional

Published
2021
Full Text
View/download PDF

152. DsRNA Sequencing for RNA Virus Surveillance Using Human Clinical Samples

Author

Izumi, Takuma, primary, Morioka, Yuhei, additional, Urayama, Syun-ichi, additional, Motooka, Daisuke, additional, Tamura, Tomokazu, additional, Kawagishi, Takahiro, additional, Kanai, Yuta, additional, Kobayashi, Takeshi, additional, Ono, Chikako, additional, Morinaga, Akinari, additional, Tomiyama, Takahiro, additional, Iseda, Norifumi, additional, Kosai, Yukiko, additional, Inokuchi, Shoichi, additional, Nakamura, Shota, additional, Tanaka, Tomohisa, additional, Moriishi, Kohji, additional, Kariwa, Hiroaki, additional, Yoshizumi, Tomoharu, additional, Mori, Masaki, additional, Matsuura, Yoshiharu, additional, and Fukuhara, Takasuke, additional

Published
2021
Full Text
View/download PDF

154. High-resolution ALMA Study of CO J = 2â€"1 Line and Dust Continuum Emissions in Cluster Galaxies at z = 1.46.

Author

Ikeda, Ryota, Tadaki, Ken-ichi, Iono, Daisuke, Kodama, Tadayuki, Chan, Jeffrey C. C., Hatsukade, Bunyo, Hayashi, Masao, Izumi, Takuma, Kohno, Kotaro, Koyama, Yusei, Shimakawa, Rhythm, Suzuki, Tomoko L., Tamura, Yoichi, and Tanaka, Ichi

Subjects
INTERSTELLAR medium, DUST, STAR formation, GAS reservoirs, GALACTIC evolution, GALACTIC bulges
Abstract

We present new Atacama Large Millimeter/submillimeter Array (ALMA) results obtained from spatially resolved CO J = 2â€"1 line (0.″4 resolution) and 870 ÎĽ m continuum (0.″2 resolution) observations of cluster galaxies in XMMXCS J2215.9-1738 at z = 1.46. Our sample comprises 17 galaxies within ∼0.5 Mpc (0.6 R 200) of the cluster center, all of which have previously been detected in the CO J = 2â€"1 line at a lower resolution. The effective radii of both the CO J = 2â€"1 line and 870 ÎĽ m dust continuum emissions are robustly measured for nine galaxies by modeling the visibilities. We find that the CO J = 2â€"1 line emission in all of the nine galaxies is more extended than the dust continuum emission by a factor of 2.8 ± 1.4. We investigate the spatially resolved Kennicuttâ€"Schmidt (KS) relation in two regions within the interstellar medium of the galaxies. The relation for our sample reveals that the central region (0 < r < R e,870 ÎĽ m) of galaxies tends to have a shorter gas depletion timescale, i.e., a higher star formation efficiency, compared to the extended region (R e,870 ÎĽ m < r < R e,CO). Overall, our result suggests that star formation activities are concentrated inside the extended gas reservoir, possibly resulting in the formation of a bulge structure. We find consistency between the ALMA 870 ÎĽ m radii of star-forming members and the Hubble Space Telescope/1.6 ÎĽ m radii of passive members in a massâ€"size distribution, which suggests a transition from star-forming to passive members within ∼0.5 Gyr. In addition, no clear differences in the KS relation nor in the sizes are found between galaxies with and without a close companion. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

155. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIII. Large-scale Feedback and Star Formation in a Low-luminosity Quasar at z = 7.07 on the Local Black Hole to Host Mass Relation

Author

Izumi, Takuma, primary, Matsuoka, Yoshiki, additional, Fujimoto, Seiji, additional, Onoue, Masafusa, additional, Strauss, Michael A., additional, Umehata, Hideki, additional, Imanishi, Masatoshi, additional, Kohno, Kotaro, additional, Kawaguchi, Toshihiro, additional, Kawamuro, Taiki, additional, Baba, Shunsuke, additional, Nagao, Tohru, additional, Toba, Yoshiki, additional, Inayoshi, Kohei, additional, Silverman, John D., additional, Inoue, Akio K., additional, Ikarashi, Soh, additional, Iwasawa, Kazushi, additional, Kashikawa, Nobunari, additional, Hashimoto, Takuya, additional, Nakanishi, Kouichiro, additional, Ueda, Yoshihiro, additional, Schramm, Malte, additional, Lee, Chien-Hsiu, additional, and Suh, Hyewon, additional

Published
2021
Full Text
View/download PDF

156. Black hole mass measurement using ALMA observations of [CI] and CO emissions in the Seyfert 1 galaxy NGC 7469

Author

Nguyen, Dieu D, primary, Izumi, Takuma, additional, Thater, Sabine, additional, Imanishi, Masatoshi, additional, Kawamuro, Taiki, additional, Baba, Shunsuke, additional, Nakano, Suzuka, additional, Turner, Jean L, additional, Kohno, Kotaro, additional, Matsushita, Satoki, additional, Martín, Sergio, additional, Meier, David S, additional, Nguyen, Phuong M, additional, and Nguyen, Lam T, additional

Published
2021
Full Text
View/download PDF

157. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XI. Proximity Zone Analysis for Faint Quasar Spectra at z similar to 6

Author

Ishimoto, Rikako, Kashikawa, Nobunari, Onoue, Masafusa, Matsuoka, Yoshiki, Izumi, Takuma, Strauss, Michael A., Fujimoto, Seiji, Imanishi, Masatoshi, Ito, Kei, Iwasawa, Kazushi, Kawaguchi, Toshihiro, Lee, Chien-Hsiu, Liang, Yongming, Lu, Ting-Yi, Momose, Rieko, Toba, Yoshiki, and Uchiyama, Hisakazu

Subjects
Reionization, Z-SIMILAR-TO-6 QUASARS, REDSHIFT, BLACK-HOLE MASSES, Quasar absorption line spectroscopy, HYDROGEN, EVOLUTION, Intergalactic medium
Abstract

We present measurements of the size of the quasar proximity zone (R-p) for 11 low-luminosity (-26.16

Published
2020

159. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XII. Extended [C ii] Structure (Merger or Outflow) in a z = 6.72 Red Quasar

Author

Izumi, Takuma, primary, Onoue, Masafusa, additional, Matsuoka, Yoshiki, additional, Strauss, Michael A., additional, Fujimoto, Seiji, additional, Umehata, Hideki, additional, Imanishi, Masatoshi, additional, Kawamuro, Taiki, additional, Nagao, Tohru, additional, Toba, Yoshiki, additional, Kohno, Kotaro, additional, Kashikawa, Nobunari, additional, Inayoshi, Kohei, additional, Kawaguchi, Toshihiro, additional, Iwasawa, Kazushi, additional, Inoue, Akio K., additional, Goto, Tomotsugu, additional, Baba, Shunsuke, additional, Schramm, Malte, additional, Suh, Hyewon, additional, Harikane, Yuichi, additional, Ueda, Yoshihiro, additional, Silverman, John D., additional, Hashimoto, Takuya, additional, Hashimoto, Yasuhiro, additional, Ikarashi, Soh, additional, Iono, Daisuke, additional, Lee, Chien-Hsiu, additional, Lee, Kianhong, additional, Minezaki, Takeo, additional, Nakanishi, Kouichiro, additional, Nakano, Suzuka, additional, Tamura, Yoichi, additional, and Tang, Ji-Jia, additional

Published
2021
Full Text
View/download PDF

161. The Synergy with SPICA and ALMA: for a Robust AGN Diagnostic

Author

Izumi, Takuma, Kohno, Kotaro, and Kawakatu, Nozomu

Abstract

SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe (June 18-21, 2013. Ito Hall, the University of Tokyo), Bunkyou-ku, Tokyo, Japan, Here we show the results of our ALMA cycle 0 observation toward the nearby type-1 Seyfert nucleus in NGC 1097. We observed some typical dense gas tracers such as HCN (J=4-3) and HCO+ (J=4-3). We find that the HCN (J=4- 3)/HCO+ (J=4-3) and HCN (J=4-3)/CS (J=7-6) integrated intensity ratios are enhanced in AGNs including NGC 1097 compared to nearby starburst galaxies and Galactic star forming regions. Multi-line/transition analysis of HCN and HCO+ emissions reveal that these lines are emitted from dense (10(exp 4.5) less than or equal to nH2 [cm(exp −3)] less than or equal to 10(exp 6) and hot (70 less than or equal to T(sub kin) [K] less than or equal to 550) regions, and that HCN to HCO+ abundance ratio is high (4-20). We introduce a “high-temperature chemistry” to explain the observed properties. Finally, we briefly discuss the possible future studies with ALMA and SPICA on AGN science., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA1730027045, レポート番号: JAXA-SP-17-010E

Published
2018

162. Subaru High-zExploration of Low-luminosity Quasars (SHELLQs). XI. Proximity Zone Analysis for Faint Quasar Spectra atz∼ 6

Author

Ishimoto, Rikako, primary, Kashikawa, Nobunari, additional, Onoue, Masafusa, additional, Matsuoka, Yoshiki, additional, Izumi, Takuma, additional, Strauss, Michael A., additional, Fujimoto, Seiji, additional, Imanishi, Masatoshi, additional, Ito, Kei, additional, Iwasawa, Kazushi, additional, Kawaguchi, Toshihiro, additional, Lee, Chien-Hsiu, additional, Liang, Yongming, additional, Lu, Ting-Yi, additional, Momose, Rieko, additional, Toba, Yoshiki, additional, and Uchiyama, Hisakazu, additional

Published
2020
Full Text
View/download PDF

164. ALMA Sub-arcsecond-resolution 183 GHz H2O and Dense Molecular Line Observations of Nearby Ultraluminous Infrared Galaxies.

Author

Imanishi, Masatoshi, Nakanishi, Kouichiro, Izumi, Takuma, and Baba, Shunsuke

Subjects
ACTIVE galactic nuclei, GALAXIES, MOLECULAR weights
Abstract

We present the results of ALMA ∼2 mm, ≲1″-resolution observations of 10 (ultra)luminous infrared galaxies ([U]LIRGs; infrared luminosity ≳1011.7L⊙) at z < 0.15, targeting dense (>104 cm−3) molecular (HCN, HCO+, and HNC J = 2–1) and 183 GHz H2O 31,3–22,0 emission lines. Active galactic nucleus (AGN)-important ULIRGs tend to show higher HCN/HCO+J = 2–1 flux ratios than starburst-classified sources. We detect 183 GHz H2O emission in almost all AGN-important ULIRGs, and elevated H2O emission is found in two sources with elevated HCN J = 2–1 emission, relative to HCO+J = 2–1. Except one ULIRG (the Superantennae), the H2O emission largely comes from the entire nuclear regions (∼1 kpc), rather than an AGN-origin megamaser at the very center (≪1 kpc). Nuclear (∼1 kpc) dense molecular gas mass derived from HCO+J = 2–1 luminosity is ≳ a few × 108M⊙, and its depletion time is estimated to be ≳106 yr in all sources. Vibrationally excited J = 2–1 emission lines of HCN and HNC are detected in a few (U)LIRGs, but those of HCO+ are not. It is suggested that in mid-infrared-radiation-exposed innermost regions around energy sources, HCO+ and HNC are substantially less abundant than HCN. In our ALMA ∼2 mm data of 10 (U)LIRGs, two continuum sources are serendipitously detected within ∼10″, which are likely to be an infrared-luminous dusty galaxy at z > 1 and a blazar. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

165. Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IX. Identification of two red quasars at z &gt; 5.6

Author

Kato, Nanako, primary, Matsuoka, Yoshiki, additional, Onoue, Masafusa, additional, Koyama, Shuhei, additional, Toba, Yoshiki, additional, Akiyama, Masayuki, additional, Fujimoto, Seiji, additional, Imanishi, Masatoshi, additional, Iwasawa, Kazushi, additional, Izumi, Takuma, additional, Kashikawa, Nobunari, additional, Kawaguchi, Toshihiro, additional, Lee, Chien-Hsiu, additional, Minezaki, Takeo, additional, Nagao, Tohru, additional, Noboriguchi, Akatoki, additional, and Strauss, Michael A, additional

Published
2020
Full Text
View/download PDF

167. Various miRNAs compensate the role of miR-122 on HCV replication

Author

Ono, Chikako, primary, Fukuhara, Takasuke, additional, Li, Songling, additional, Wang, Jian, additional, Sato, Asuka, additional, Izumi, Takuma, additional, Fauzyah, Yuzy, additional, Yamamoto, Takuya, additional, Morioka, Yuhei, additional, Dokholyan, Nikolay V., additional, Standley, Daron M., additional, and Matsuura, Yoshiharu, additional

Published
2020
Full Text
View/download PDF

169. The MBHBM⋆ Project. I. Measurement of the Central Black Hole Mass in Spiral Galaxy NGC 3504 Using Molecular Gas Kinematics

Author

Nguyen, Dieu D., primary, den Brok, Mark, additional, Seth, Anil C., additional, Davis, Timothy A., additional, Greene, Jenny E., additional, Cappellari, Michelle, additional, Jensen, Joseph B., additional, Thater, Sabine, additional, Iguchi, Satoru, additional, Imanishi, Masatoshi, additional, Izumi, Takuma, additional, Nyland, Kristina, additional, Neumayer, Nadine, additional, Nakanishi, Kouichiro, additional, Nguyen, Phuong M., additional, Tsukui, Takafumi, additional, Bureau, Martin, additional, Onishi, Kyoko, additional, Nguyen, Quang L., additional, and Le, Ngan M., additional

Published
2020
Full Text
View/download PDF

172. Rimonabant suppresses RNA transcription of hepatitis B virus by inhibiting hepatocyte nuclear factor 4α

Author

Sato, Asuka, primary, Ono, Chikako, additional, Tamura, Tomokazu, additional, Mori, Hiroyuki, additional, Izumi, Takuma, additional, Torii, Shiho, additional, Fauzyah, Yuzy, additional, Yamamoto, Takuya, additional, Morioka, Yuhei, additional, Okuzaki, Daisuke, additional, Fukuhara, Takasuke, additional, and Matsuura, Yoshiharu, additional

Published
2020
Full Text
View/download PDF

173. Various miRNAs are involved in efficient HCV replication

Author

Ono, Chikako, primary, Fukuhara, Takasuke, additional, Li, Songling, additional, Wang, Jian, additional, Sato, Asuka, additional, Izumi, Takuma, additional, Fauzyah, Yuzy, additional, Yamamoto, Takuya, additional, Morioka, Yuhei, additional, Dokholyan, Nikolay V., additional, Standley, Daron M., additional, and Matsuura, Yoshiharu, additional

Published
2020
Full Text
View/download PDF

174. In Vivo Dynamics of Reporter Flaviviridae Viruses

Author

Tamura, Tomokazu, primary, Igarashi, Manabu, additional, Enkhbold, Bazarragchaa, additional, Suzuki, Tatsuya, additional, Okamatsu, Masatoshi, additional, Ono, Chikako, additional, Mori, Hiroyuki, additional, Izumi, Takuma, additional, Sato, Asuka, additional, Fauzyah, Yuzy, additional, Okamoto, Toru, additional, Sakoda, Yoshihiro, additional, Fukuhara, Takasuke, additional, and Matsuura, Yoshiharu, additional

Published
2019
Full Text
View/download PDF

175. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). X. Discovery of 35 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 7.0

Author

Matsuoka, Yoshiki, primary, Iwasawa, Kazushi, additional, Onoue, Masafusa, additional, Kashikawa, Nobunari, additional, Strauss, Michael A., additional, Lee, Chien-Hsiu, additional, Imanishi, Masatoshi, additional, Nagao, Tohru, additional, Akiyama, Masayuki, additional, Asami, Naoko, additional, Bosch, James, additional, Furusawa, Hisanori, additional, Goto, Tomotsugu, additional, Gunn, James E., additional, Harikane, Yuichi, additional, Ikeda, Hiroyuki, additional, Izumi, Takuma, additional, Kawaguchi, Toshihiro, additional, Kato, Nanako, additional, Kikuta, Satoshi, additional, Kohno, Kotaro, additional, Komiyama, Yutaka, additional, Koyama, Shuhei, additional, Lupton, Robert H., additional, Minezaki, Takeo, additional, Miyazaki, Satoshi, additional, Murayama, Hitoshi, additional, Niida, Mana, additional, Nishizawa, Atsushi J., additional, Noboriguchi, Akatoki, additional, Oguri, Masamune, additional, Ono, Yoshiaki, additional, Ouchi, Masami, additional, Price, Paul A., additional, Sameshima, Hiroaki, additional, Schulze, Andreas, additional, Silverman, John D., additional, Sugiyama, Naoshi, additional, Tait, Philip J., additional, Takada, Masahiro, additional, Takata, Tadafumi, additional, Tanaka, Masayuki, additional, Tang, Ji-Jia, additional, Toba, Yoshiki, additional, Utsumi, Yousuke, additional, Wang, Shiang-Yu, additional, and Yamashita, Takuji, additional

Published
2019
Full Text
View/download PDF

176. Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). III. Star formation properties of the host galaxies at z greater than or similar to 6 studied with ALMA

Author

Izumi, Takuma, Onoue, Masafusa, Shirakata, Hikari, Nagao, Tohru, Kohno, Kotaro, Matsuoka, Yoshiki, Imanishi, Masatoshi, Strauss, Michael A., Kashikawa, Nobunari, Schulze, Andreas, Silverman, John D., Fujimoto, Seiji, Harikane, Yuichi, Toba, Yoshiki, Umehata, Hideki, Nakanishi, Kouichiro, Greene, Jenny E., Tamura, Yoichi, Taniguchi, Akio, Yamaguchi, Yuki, Goto, Tomotsugu, Hashimoto, Yasuhiro, Ikarashi, Soh, Iono, Daisuke, Iwasawa, Kazushi, Lee, Chien-Hsiu, Makiya, Ryu, Minezaki, Takeo, Tang, Ji-Jia, and Astronomy

Subjects
ACTIVE GALACTIC NUCLEI, C-II, FORMING GALAXIES, ULTRA DEEP FIELD, Astrophysics::High Energy Astrophysical Phenomena, MU-M, galaxies: starburst, Astrophysics::Cosmology and Extragalactic Astrophysics, HIGH-REDSHIFT QUASARS, galaxies: quasars, MOLECULAR GAS, BROAD ABSORPTION-LINE, SUPERMASSIVE BLACK-HOLES, galaxies: high-redshift, quasars: general, DIGITAL SKY SURVEY, Astrophysics::Galaxy Astrophysics, galaxies: ISM
Abstract

We present our ALMA Cycle 4 measurements of the [C II] emission line and the underlying far-infrared (FIR) continuum emission from four optically low-luminosity (M-1450 > -25) quasars at z >= 6 discovered by the Subaru Hyper Suprime Cam (HSC) survey. The [C II] line and FIR continuum luminosities lie in the ranges L-[C II] = (3.8-10.2) x 10(8) L-circle dot and L-FIR = (1.2-2.0) x 10(11) L-circle dot, which are at least one order of magnitude smaller than those of optically-luminous quasars at z >= 6. We estimate the star formation rates (SFRs) of our targets as similar or equal to 23-40 M-circle dot yr(-1). Their line and continuum-emitting regions are marginally resolved, and found to be comparable in size to those of optically-luminous quasars, indicating that their SFR or likely gas mass surface densities (key controlling parameter of mass accretion) are accordingly different. The L-[C II]/L-FIR ratios of the hosts, similar or equal to (2.2-8.7) x 10 (-3), are fully consistent with local star-forming galaxies. Using the [C II] dynamics, we derived their dynamical masses within a radius of 1.5-2.5 kpc as similar or equal to (1.4-8.2) x 10(10)M(circle dot). By interpreting these masses as stellar ones, we suggest that these faint quasar hosts are on or even below the star-forming main sequence at z similar to 6, i.e., they appear to be transforming into quiescent galaxies. This is in contrast to the optically-luminous quasars at those redshifts, which show starburst-like properties. Finally, we find that the ratios of black hole mass to host galaxy dynamical mass of most of the low-luminosity quasars, including the HSC ones, are consistent with the local value. The mass ratios of the HSC quasars can be reproduced by a semi-analytical model that assumes merger-induced black hole host galaxy evolution.

Published
2018

177. A Radio-to-millimeter Census of Star-forming Galaxies in Protocluster 4C 23.56 atz= 2.5: Global and Local Gas Kinematics

Author

Lee, Minju M., primary, Tanaka, Ichi, additional, Kawabe, Ryohei, additional, Aretxaga, Itziar, additional, Hatsukade, Bunyo, additional, Izumi, Takuma, additional, Kajisawa, Masaru, additional, Kodama, Tadayuki, additional, Kohno, Kotaro, additional, Nakanishi, Kouichiro, additional, Saito, Toshiki, additional, Tadaki, Ken-ichi, additional, Tamura, Yoichi, additional, Umehata, Hideki, additional, and Zeballos, Milagros, additional

Published
2019
Full Text
View/download PDF

178. Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). VIII. A less biased view of the early co-evolution of black holes and host galaxies

Author

Izumi, Takuma, primary, Onoue, Masafusa, additional, Matsuoka, Yoshiki, additional, Nagao, Tohru, additional, Strauss, Michael A, additional, Imanishi, Masatoshi, additional, Kashikawa, Nobunari, additional, Fujimoto, Seiji, additional, Kohno, Kotaro, additional, Toba, Yoshiki, additional, Umehata, Hideki, additional, Goto, Tomotsugu, additional, Ueda, Yoshihiro, additional, Shirakata, Hikari, additional, Silverman, John D, additional, Greene, Jenny E, additional, Harikane, Yuichi, additional, Hashimoto, Yasuhiro, additional, Ikarashi, Soh, additional, Iono, Daisuke, additional, Iwasawa, Kazushi, additional, Lee, Chien-Hsiu, additional, Minezaki, Takeo, additional, Nakanishi, Kouichiro, additional, Tamura, Yoichi, additional, Tang, Ji-Jia, additional, and Taniguchi, Akio, additional

Published
2019
Full Text
View/download PDF

180. Characterization of human pegivirus infection in liver transplantation recipients

Author

Izumi, Takuma, primary, Sakata, Kazuhito, additional, Okuzaki, Daisuke, additional, Inokuchi, Shoichi, additional, Tamura, Tomokazu, additional, Motooka, Daisuke, additional, Nakamura, Shota, additional, Ono, Chikako, additional, Shimokawa, Masahiro, additional, Matsuura, Yoshiharu, additional, Mori, Masaki, additional, Fukuhara, Takasuke, additional, and Yoshizumi, Tomoharu, additional

Published
2019
Full Text
View/download PDF

181. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). VI. Black Hole Mass Measurements of Six Quasars at 6.1 ≤ z ≤ 6.7

Author

Onoue, Masafusa, primary, Kashikawa, Nobunari, additional, Matsuoka, Yoshiki, additional, Kato, Nanako, additional, Izumi, Takuma, additional, Nagao, Tohru, additional, Strauss, Michael A., additional, Harikane, Yuichi, additional, Imanishi, Masatoshi, additional, Ito, Kei, additional, Iwasawa, Kazushi, additional, Kawaguchi, Toshihiro, additional, Lee, Chien-Hsiu, additional, Noboriguchi, Akatoki, additional, Suh, Hyewon, additional, Tanaka, Masayuki, additional, and Toba, Yoshiki, additional

Published
2019
Full Text
View/download PDF

184. Rapid evolution and transformation into quiescence?: ALMA view on z > 6 low-luminosity quasars

Author

Izumi, Takuma, primary, Onoue, Masafusa, additional, Matsuoka, Yoshiki, additional, Nagao, Tohru, additional, Strauss, Michael A., additional, Imanishi, Masatoshi, additional, Kashikawa, Nobunari, additional, Fujimoto, Seiji, additional, Kohno, Kotaro, additional, Toba, Yoshiki, additional, Umehata, Hideki, additional, Goto, Tomotsugu, additional, Ueda, Yoshihiro, additional, Shirakata, Hikari, additional, Silverman, John D., additional, Greene, Jenny E., additional, Harikane, Yuichi, additional, Hashimoto, Yasuhiro, additional, Ikarashi, Soh, additional, Iono, Daisuke, additional, Iwasawa, Kazushi, additional, Lee, Chien-Hsiu, additional, Minezaki, Takeo, additional, Nakanishi, Kouichiro, additional, Tamura, Yoichi, additional, Tang, Ji-Jia, additional, and Taniguchi, Akio, additional

Published
2019
Full Text
View/download PDF

187. Discovery of the First Low-luminosity Quasar at z > 7

Author

Matsuoka, Yoshiki, primary, Onoue, Masafusa, additional, Kashikawa, Nobunari, additional, Strauss, Michael A, additional, Iwasawa, Kazushi, additional, Lee, Chien-Hsiu, additional, Imanishi, Masatoshi, additional, Nagao, Tohru, additional, Akiyama, Masayuki, additional, Asami, Naoko, additional, Bosch, James, additional, Furusawa, Hisanori, additional, Goto, Tomotsugu, additional, Gunn, James E, additional, Harikane, Yuichi, additional, Ikeda, Hiroyuki, additional, Izumi, Takuma, additional, Kawaguchi, Toshihiro, additional, Kato, Nanako, additional, Kikuta, Satoshi, additional, Kohno, Kotaro, additional, Komiyama, Yutaka, additional, Koyama, Shuhei, additional, Lupton, Robert H, additional, Minezaki, Takeo, additional, Miyazaki, Satoshi, additional, Murayama, Hitoshi, additional, Niida, Mana, additional, Nishizawa, Atsushi J, additional, Noboriguchi, Akatoki, additional, Oguri, Masamune, additional, Ono, Yoshiaki, additional, Ouchi, Masami, additional, Price, Paul A, additional, Sameshima, Hiroaki, additional, Schulze, Andreas, additional, Shirakata, Hikari, additional, Silverman, John D, additional, Sugiyama, Naoshi, additional, Tait, Philip J, additional, Takada, Masahiro, additional, Takata, Tadafumi, additional, Tanaka, Masayuki, additional, Tang, Ji-Jia, additional, Toba, Yoshiki, additional, Utsumi, Yousuke, additional, Wang, Shiang-Yu, additional, and Yamashita, Takuji, additional

Published
2019
Full Text
View/download PDF

190. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). V. Quasar Luminosity Function and Contribution to Cosmic Reionization at z = 6

Author

Matsuoka, Yoshiki, primary, Strauss, Michael A., additional, Kashikawa, Nobunari, additional, Onoue, Masafusa, additional, Iwasawa, Kazushi, additional, Tang, Ji-Jia, additional, Lee, Chien-Hsiu, additional, Imanishi, Masatoshi, additional, Nagao, Tohru, additional, Akiyama, Masayuki, additional, Asami, Naoko, additional, Bosch, James, additional, Furusawa, Hisanori, additional, Goto, Tomotsugu, additional, Gunn, James E., additional, Harikane, Yuichi, additional, Ikeda, Hiroyuki, additional, Izumi, Takuma, additional, Kawaguchi, Toshihiro, additional, Kato, Nanako, additional, Kikuta, Satoshi, additional, Kohno, Kotaro, additional, Komiyama, Yutaka, additional, Lupton, Robert H., additional, Minezaki, Takeo, additional, Miyazaki, Satoshi, additional, Murayama, Hitoshi, additional, Niida, Mana, additional, Nishizawa, Atsushi J., additional, Noboriguchi, Akatoki, additional, Oguri, Masamune, additional, Ono, Yoshiaki, additional, Ouchi, Masami, additional, Price, Paul A., additional, Sameshima, Hiroaki, additional, Schulze, Andreas, additional, Shirakata, Hikari, additional, Silverman, John D., additional, Sugiyama, Naoshi, additional, Tait, Philip J., additional, Takada, Masahiro, additional, Takata, Tadafumi, additional, Tanaka, Masayuki, additional, Toba, Yoshiki, additional, Utsumi, Yousuke, additional, Wang, Shiang-Yu, additional, and Yamashita, Takuji, additional

Published
2018
Full Text
View/download PDF

192. ALMA detection of millimetre 183 GHz H2O maser emission in the Superantennae galaxy at z ∼ 0.06.

Author

Imanishi, Masatoshi, Hagiwara, Yoshiaki, Horiuchi, Shinji, Izumi, Takuma, and Nakanishi, Kouichiro

Subjects
MASERS, SUBMILLIMETER astronomy, SUPERMASSIVE black holes, ACTIVE galactic nuclei, GALAXIES, ACTIVE galaxies
Abstract

We present the results of Atacama Large Millimeter/submillimeter Array (ALMA) band-5 (∼170 GHz) observations of the merging ultraluminous infrared galaxy, the 'Superantennae' (IRAS 19254−7245), at z  = 0.0617, which has been diagnosed as containing a luminous obscured active galactic nucleus (AGN). In addition to dense molecular line emission (HCN J  = 2–1, HCO+ J  = 2–1, and HNC J  = 2–1), we detect a highly luminous (∼6 × 10 |$^{4}\, \mathrm{L}_{\odot }$|⁠) 183 GHz H2O 31,3–22,0 emission line. We interpret the strong H2O emission as largely originating in maser amplification in AGN-illuminated dense and warm molecular gas, based on (1) the spatially compact (≲220 pc) nature of the H2O emission, unlike spatially resolved (≳500 pc) dense molecular emission, and (2) a strikingly different velocity profile from, and (3) significantly elevated flux ratio relative to, dense molecular emission lines. H2O maser emission, other than the widely studied 22 GHz 61,6–52,3 line, has been expected to provide important information on the physical properties of gas in the vicinity of a central mass-accreting supermassive black hole (SMBH), because of different excitation energy. We here demonstrate that with highly sensitive ALMA, millimetre 183 GHz H2O maser detection is feasible out to >270 Mpc, opening a new window to scrutinize molecular gas properties around a mass-accreting SMBH far beyond the immediately local Universe. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

193. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XI. Proximity Zone Analysis for Faint Quasar Spectra at z ∼ 6.

Author

Ishimoto, Rikako, Kashikawa, Nobunari, Onoue, Masafusa, Matsuoka, Yoshiki, Izumi, Takuma, Strauss, Michael A., Fujimoto, Seiji, Imanishi, Masatoshi, Ito, Kei, Iwasawa, Kazushi, Kawaguchi, Toshihiro, Lee, Chien-Hsiu, Liang, Yongming, Lu, Ting-Yi, Momose, Rieko, Toba, Yoshiki, and Uchiyama, Hisakazu

Subjects
INTERSTELLAR medium, QUASARS, FORECASTING
Abstract

We present measurements of the size of the quasar proximity zone (Rp) for 11 low-luminosity () quasars at z ∼ 6, discovered by the Subaru High-z Exploration of Low-Luminosity Quasars project. Our faint quasar sample expands the Rp measurement down to mag, where more common quasar populations dominate at the epoch. We restrict the sample to quasars whose systemic redshifts have been precisely measured by [C ii ] 158 μm or Mg ii λ2798 emission lines. We also update the Rp measurements for 26 luminous quasars presented in Eilers et al. by using the latest systemic redshift results. The luminosity dependence on Rp is found to be consistent with the theoretical prediction assuming a highly ionized intergalactic medium. We find a shallow redshift evolution of the luminosity-corrected Rp, () over. This trend is steeper than that of Eilers et al., but significantly shallower than those of the earlier studies. Our results suggest that Rp,corr is insensitive to the neutral fraction of the universe at z ∼ 6. Four quasars show exceptionally small (proper Mpc), which could be the result of their young age (<104 yr) in the reionization epoch, though statistics on this are still scarce. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

194. ALMA deep field in SSA22: Blindly detected CO emitters and [C ii] emitter candidates

Author

Hayatsu, Natsuki H., Yoshida, Naoki, Smail, Ian, Swinbank, A. Mark, Ivison, Rob, Kubo, Mariko, Nakanishi, Kouichiro, Kawabe, Ryohei, Nagao, Tohru, Inoue, Akio K., Takeuchi, Tsutomu T., Lee, Minju, Ao, Yiping, Fujimoto, Seiji, Izumi, Takuma, Yamaguchi, Yuki, Ikarashi, Soh, Matsuda, Yuichi, Umehata, Hideki, Kohno, Kotaro, Tamura, Yoichi, Iono, Daisuke, Hatsukade, Bunyo, Yamada, Toru, and Astronomy

Subjects
ACTIVE GALACTIC NUCLEI, SPECTROSCOPIC SURVEY, formation [galaxies], Hubble Deep Field, INITIAL MASS FUNCTION, clusters: individual (SSA22) [galaxies], MU-M, FOS: Physical sciences, Astrophysics, 01 natural sciences, Submillimeter Array, HIGH-REDSHIFT GALAXIES, FAR-INFRARED LINE, galaxies: clusters: individual (SSA22), 0103 physical sciences, STAR-FORMING GALAXIES, galaxies: formation, Emission spectrum, NUMBER COUNTS, 010303 astronomy & astrophysics, Common emitter, Physics, SUBMILLIMETER GALAXIES, 010308 nuclear & particles physics, Star formation, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, early universe, Redshift, Galaxy, LUMINOSITY FUNCTION, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Millimeter
Abstract

著者人数: 24名, Accepted: 2017-02-24, 資料番号: SA1170016000

Published
2017

195. AGN X-Ray Irradiation of CO Gas in NGC 2110 Revealed by Chandra and ALMA.

Author

Kawamuro, Taiki, Izumi, Takuma, Onishi, Kyoko, Imanishi, Masatoshi, Nguyen, Dieu D., and Baba, Shunsuke

Subjects
X-ray fluorescence, X-rays, PROPERTIES of matter, ACTIVE galactic nuclei, IRRADIATION
Abstract

We report spatial distributions of the Fe–Kα line at 6.4 keV and the CO(J = 2–1) line at 230.538 GHz in NGC 2110, which are, respectively, revealed by Chandra and Atacama Large Millimeter/submillimeter Array (ALMA) at ≈0.″5. A Chandra 6.2–6.5 keV to 3.0–6.0 keV image suggests that the Fe–Kα emission extends preferentially in a northwest to southeast direction out to ≈3″, or ∼500 pc, on each side. Spatially resolved spectral analyses support this by finding significant Fe–Kα emission lines only in the northwest and southeast regions. Moreover, their equivalent widths are found to be ∼1.5 keV, indicative for the fluorescence by nuclear X-ray irradiation as the physical origin. By contrast, CO(J = 2–1) emission is weak therein. For quantitative discussion, we derive ionization parameters by following an X-ray dominated region (XDR) model. We then find them high enough to interpret the weakness as the result of X-ray dissociation of CO and/or H2. Another possibility also remains that CO molecules follow a superthermal distribution, resulting in brighter emission in higher-J lines. Further follow-up observations are encouraged to draw a conclusion on what predominantly changes the interstellar matter properties and whether the X-ray irradiation eventually affects the surrounding star formation as active galactic nucleus (AGN) feedback. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

196. Subaru High- z Exploration of Low-luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 6.9

Author

Matsuoka, Yoshiki, primary, Iwasawa, Kazushi, additional, Onoue, Masafusa, additional, Kashikawa, Nobunari, additional, Strauss, Michael A., additional, Lee, Chien-Hsiu, additional, Imanishi, Masatoshi, additional, Nagao, Tohru, additional, Akiyama, Masayuki, additional, Asami, Naoko, additional, Bosch, James, additional, Furusawa, Hisanori, additional, Goto, Tomotsugu, additional, Gunn, James E., additional, Harikane, Yuichi, additional, Ikeda, Hiroyuki, additional, Izumi, Takuma, additional, Kawaguchi, Toshihiro, additional, Kato, Nanako, additional, Kikuta, Satoshi, additional, Kohno, Kotaro, additional, Komiyama, Yutaka, additional, Lupton, Robert H., additional, Minezaki, Takeo, additional, Miyazaki, Satoshi, additional, Morokuma, Tomoki, additional, Murayama, Hitoshi, additional, Niida, Mana, additional, Nishizawa, Atsushi J., additional, Oguri, Masamune, additional, Ono, Yoshiaki, additional, Ouchi, Masami, additional, Price, Paul A., additional, Sameshima, Hiroaki, additional, Schulze, Andreas, additional, Shirakata, Hikari, additional, Silverman, John D., additional, Sugiyama, Naoshi, additional, Tait, Philip J., additional, Takada, Masahiro, additional, Takata, Tadafumi, additional, Tanaka, Masayuki, additional, Tang, Ji-Jia, additional, Toba, Yoshiki, additional, Utsumi, Yousuke, additional, Wang, Shiang-Yu, additional, and Yamashita, Takuji, additional

Published
2018
Full Text
View/download PDF

198. Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). III. Star formation properties of the host galaxies at z ≳ 6 studied with ALMA

Author

Izumi, Takuma, primary, Onoue, Masafusa, additional, Shirakata, Hikari, additional, Nagao, Tohru, additional, Kohno, Kotaro, additional, Matsuoka, Yoshiki, additional, Imanishi, Masatoshi, additional, Strauss, Michael A, additional, Kashikawa, Nobunari, additional, Schulze, Andreas, additional, Silverman, John D, additional, Fujimoto, Seiji, additional, Harikane, Yuichi, additional, Toba, Yoshiki, additional, Umehata, Hideki, additional, Nakanishi, Kouichiro, additional, Greene, Jenny E, additional, Tamura, Yoichi, additional, Taniguchi, Akio, additional, Yamaguchi, Yuki, additional, Goto, Tomotsugu, additional, Hashimoto, Yasuhiro, additional, Ikarashi, Soh, additional, Iono, Daisuke, additional, Iwasawa, Kazushi, additional, Lee, Chien-Hsiu, additional, Makiya, Ryu, additional, Minezaki, Takeo, additional, and Tang, Ji-Jia, additional

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results