212 results on '"Matsuda, Yuichi"'
Search Results
2. Fundamental study on optical performance of low-melting-point metal mirrors for space telescopes
- Author
-
Imaizumi, Eisuke, Kondo, Masatoshi, Murakami, Katsuya, Hayano, Yutaka, and Matsuda, Yuichi
- Published
- 2023
- Full Text
- View/download PDF
3. Older phase 2 cardiac rehabilitation patients engaged in gardening maintained physical function during the COVID-19 pandemic
- Author
-
Ogura, Asami, Izawa, Kazuhiro P., Tawa, Hideto, Kureha, Fumie, Wada, Masaaki, Harada, Nobuko, Ikeda, Yuki, Kimura, Kaemi, Kondo, Naomi, Kanai, Masashi, Kubo, Ikko, Yoshikawa, Ryohei, and Matsuda, Yuichi
- Published
- 2022
- Full Text
- View/download PDF
4. Relationship of end-tidal oxygen partial pressure to the determinants of anaerobic threshold in post-myocardial infarction patients
- Author
-
Ogura, Asami, Izawa, Kazuhiro P., Sato, Shinji, Tawa, Hideto, Kureha, Fumie, Wada, Masaaki, Kanai, Masashi, Kubo, Ikko, Brubaker, Peter H., Yoshikawa, Ryohei, and Matsuda, Yuichi
- Published
- 2021
- Full Text
- View/download PDF
5. Impact of the COVID-19 pandemic on phase 2 cardiac rehabilitation patients in Japan
- Author
-
Ogura, Asami, Izawa, Kazuhiro P., Tawa, Hideto, Kureha, Fumie, Wada, Masaaki, Harada, Nobuko, Ikeda, Yuki, Kimura, Kaemi, Kondo, Naomi, Kanai, Masashi, Kubo, Ikko, Yoshikawa, Ryohei, and Matsuda, Yuichi
- Published
- 2021
- Full Text
- View/download PDF
6. Nadir Aldosterone Levels After Confirmatory Tests Are Correlated With Left Ventricular Hypertrophy in Primary Aldosteronism
- Author
-
Ohno, Youichi, Sone, Masakatsu, Inagaki, Nobuya, Kawashima, Akiyuki, Takeda, Yoshiyu, Yoneda, Takashi, Kurihara, Isao, Itoh, Hiroshi, Tsuiki, Mika, Ichijo, Takamasa, Katabami, Takuyuki, Wada, Norio, Sakamoto, Ryuichi, Ogawa, Yoshihiro, Yoshimoto, Takanobu, Yamada, Tetsuya, Kawashima, Junji, Matsuda, Yuichi, Kobayashi, Hiroki, Kamemura, Kohei, Yamamoto, Koichi, Otsuki, Michio, Okamura, Shintaro, Izawa, Shoichiro, Okamoto, Ryuji, Tamura, Kouichi, Tanabe, Akiyo, and Naruse, Mitsuhide
- Published
- 2020
- Full Text
- View/download PDF
7. End‐tidal oxygen partial pressure is a strong prognostic predictive factor in patients with cardiac disease.
- Author
-
Ogura, Asami, Izawa, Kazuhiro P., Tawa, Hideto, Wada, Masaaki, Kanai, Masashi, Kubo, Ikko, Makihara, Ayano, Yoshikawa, Ryohei, and Matsuda, Yuichi
- Subjects
PARTIAL pressure ,CARDIAC patients ,EXERCISE tests ,PROGNOSIS ,HYPERVENTILATION ,ANAEROBIC threshold - Abstract
Background: Cardiopulmonary exercise testing (CPET) variables represent central and peripheral factors and combined factors in the pathology of patients with cardiac disease. The difference in end‐tidal oxygen partial pressure from resting to anaerobic threshold (ΔPETO2) may represent predominantly peripheral factors. This study aimed to verify the prognostic significance of ΔPETO2 for major adverse cardiac and cerebrovascular events (MACCE) in cardiac patients, including comparison with the minute ventilation–carbon dioxide production relationship (VE/VCO2 slope), and peak oxygen uptake (VO2). Methods: In total, 185 patients with cardiac disease who underwent CPET were consecutively enroled in this retrospective study. The primary endpoint was 3‐year MACCE. The ability of ΔPETO2, VE/VCO2 slope, and peak VO2 to predict MACCE was examined. Results: Optimal cut‐off values for predicting MACCE were 2.0 mmHg for ΔPETO2 (area under the curve [AUC]: 0.829), 29.8 for VE/VCO2 slope (AUC: 0.734), and 19.0 mL/min/kg for peak VO2 (AUC: 0.755). The AUC of ΔPETO2 was higher than those of VE/VCO2 slope and peak VO2. The MACCE‐free survival rate was significantly lower in the ΔPETO2 ≤ 2.0 group versus the ΔPETO2 > 2.0 group (44.4% vs. 91.2%, p < 0.001). ΔPETO2 ≤ 2.0 was an independent predictor of MACCE after adjustment for age and VE/VCO2 slope (hazard ratio [HR], 7.28; p < 0.001) and after adjustment for age and peak VO2 (HR, 6.52; p < 0.001). Conclusion: ΔPETO2 was a strong predictor of MACCE independent of and superior to VE/VCO2 slope and peak VO2 in patients with cardiac disease. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
8. SILVERRUSH. XIII. A Catalog of 20,567 Ly$\alpha$ Emitters at $z=2-7$ Identified in the Full-Depth Data of the Subaru/HSC-SSP and CHORUS Surveys
- Author
-
Kikuta, Satoshi, Ouchi, Masami, Shibuya, Takatoshi, Liang, Yongming, Umeda, Hiroya, Matsumoto, Akinori, Shimasaku, Kazuhiro, Harikane, Yuichi, Ono, Yoshiaki, Inoue, Akio K., Yamanaka, Satoshi, Kusakabe, Haruka, Momose, Rieko, Kashikawa, Nobunari, Matsuda, Yuichi, and Lee, Chien-Hsiu
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
We present 20,567 Ly$\alpha$ emitters (LAEs) at $z=2.2-7.3$ that are photometrically identified by the SILVERRUSH program in a large survey area up to 25 deg$^2$ with deep images of five broadband filters (grizy) and seven narrowband filters targeting Ly$\alpha$ lines at $z=2.2$, $3.3$, $4.9$, $5.7$, $6.6$, $7.0$, and $7.3$ taken by the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) and the Cosmic HydrOgen Reionization Unveiled with Subaru (CHORUS) survey. We select secure $>5\sigma$ sources showing narrowband color excesses via Ly$\alpha$ break screening, taking into account the spatial inhomogeneity of limiting magnitudes. After removing spurious sources by careful masking and visual inspection of coadded and multi-epoch images obtained over the seven years of the surveys, we construct LAE samples consisting of 6,995, 4,642, 726, 6,124, 2,058, 18, and 5 LAEs at $z=2.2$, 3.3, 4.9, 5.7, 6.6, 7.0, and 7.3, respectively, although the $z=7.3$ candidates are tentative. Our LAE catalogs contain 241 spectroscopically confirmed LAEs at the expected redshifts from previous work. We demonstrate that the number counts of our LAEs are consistent with previous studies with similar LAE selection criteria. The LAE catalogs will be made public on our project webpage with detailed descriptions of the content and ancillary information about the masks and limiting magnitudes., Comment: 37 pages, 19 Figures, 5 Tables. Submitted to AAS Journals
- Published
- 2023
9. The onset of star formation 250 million years after the Big Bang
- Author
-
Hashimoto, Takuya, Laporte, Nicolas, Mawatari, Ken, Ellis, Richard S., Inoue, Akio K., Zackrisson, Erik, Roberts-Borsani, Guido, Zheng, Wei, Tamura, Yoichi, Bauer, Franz E., Fletcher, Thomas, Harikane, Yuichi, Hatsukade, Bunyo, Hayatsu, Natsuki H., Matsuda, Yuichi, Matsuo, Hiroshi, Okamoto, Takashi, Ouchi, Masami, Pelló, Roser, Rydberg, Claes-Erik, Shimizu, Ikkoh, Taniguchi, Yoshiaki, Umehata, Hideki, and Yoshida, Naoki
- Published
- 2018
- Full Text
- View/download PDF
10. Subtype prediction of primary aldosteronism by combining aldosterone concentrations in the left adrenal vein and inferior vena cava: a multicenter collaborative study on adrenal venous sampling
- Author
-
Fujii, Yuichi, Umakoshi, Hironobu, Wada, Norio, Ichijo, Takamasa, Kamemura, Kohei, Matsuda, Yuichi, Kai, Tatsuya, Fukuoka, Tomikazu, Sakamoto, Ryuichi, Ogo, Atsushi, Suzuki, Tomoko, Nanba, Kazutaka, Tsuiki, Mika, Naruse, Mitsuhide, and on behalf of WAVES-J Study Group
- Published
- 2018
- Full Text
- View/download PDF
11. Detection of an oxygen emission line from a high-redshift galaxy in the reionization epoch
- Author
-
Inoue, Akio K., Tamura, Yoichi, Matsuo, Hiroshi, Mawatari, Ken, Shimizu, Ikkoh, Shibuya, Takatoshi, Ota, Kazuaki, Yoshida, Naoki, Zackrisson, Erik, Kashikawa, Nobunari, Kohno, Kotaro, Umehata, Hideki, Hatsukade, Bunyo, Iye, Masanori, Matsuda, Yuichi, Okamoto, Takashi, and Yamaguchi, Yuki
- Published
- 2016
12. UV & Ly$\alpha$ halos of Ly$\alpha$ emitters across environments at z=2.84
- Author
-
Kikuta, Satoshi, Matsuda, Yuichi, Inoue, Shigeki, Steidel, Charles C., Cen, Renyue, Zheng, Zheng, Yajima, Hidenobu, Momose, Rieko, Imanishi, Masatoshi, and Komiyama, Yutaka
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
We present UV and Ly$\alpha$ radial surface brightness (SB) profiles of Ly$\alpha$ emitters (LAEs) at $z=2.84$ detected with the Hyper Suprime-Cam (HSC) on the Subaru Telescope. The depth of our data, together with the wide field coverage including a protocluster, enable us to study the dependence of Ly$\alpha$ halos (LAHs) on various galaxy properties, including Mpc-scale environments. UV and Ly$\alpha$ images of 3490 LAEs are extracted, and stacking the images yields SB sensitivity of $\sim1\times10^{-20}\mathrm{~erg~s^{-1}~cm^{-2}~arcsec^{-2}}$ in Ly$\alpha$, reaching the expected level of optically thick gas illuminated by the UV background at $z\sim3$. Fitting of the two-component exponential function gives the scale-lengths of $1.56\pm0.01$ and $10.4\pm0.3$ pkpc. Dividing the sample according to their photometric properties, we find that while the dependence of halo scale-length on environment outside of the protocluster core is not clear, LAEs in the central regions of protoclusters appear to have very large LAHs which could be caused by combined effects of source overlapping and diffuse Ly$\alpha$ emission from cool intergalactic gas permeating the forming protocluster core irradiated by active members. For the first time, we identify ``UV halos'' around bright LAEs which are probably due to a few lower-mass satellite galaxies. Through comparison with recent numerical simulations, we conclude that, while scattered Ly$\alpha$ photons from the host galaxies are dominant, star formation in satellites evidently contributes to LAHs, and that fluorescent Ly$\alpha$ emission may be boosted within protocluster cores at cosmic noon and/or near bright QSOs., Comment: 29 pages, 20 Figures, Accepted for publication in ApJ
- Published
- 2023
13. Association Between Acute Fall in Estimated Glomerular Filtration Rate After Treatment for Primary Aldosteronism and Long-Term Decline in Renal Function
- Author
-
Kobayashi, Hiroki, Abe, Masanori, Nakamura, Yoshihiro, Takahashi, Katsutoshi, Fujita, Megumi, Takeda, Yoshiyu, Yoneda, Takashi, Kurihara, Isao, Itoh, Hiroshi, Tsuiki, Mika, Wada, Norio, Ichijo, Takamasa, Katabami, Takuyuki, Ogawa, Yoshihiro, Kawashima, Junji, Yoshimoto, Takanobu, Sone, Masakatsu, Inagaki, Nobuya, Watanabe, Minemori, Kamemura, Kohei, Matsuda, Yuichi, Izawa, Shoichiro, Tanabe, Makito, Tanabe, Akiyo, Suzuki, Tomoko, and Naruse, Mitsuhide
- Published
- 2019
- Full Text
- View/download PDF
14. Sex Difference in the Association Between Subtype Distribution and Age at Diagnosis in Patients With Primary Aldosteronism
- Author
-
Akasaka, Hiroshi, Yamamoto, Koichi, Rakugi, Hiromi, Nagasawa, Motonori, Nakamaru, Ryo, Ichijo, Takamasa, Takeda, Yoshiyu, Kurihara, Isao, Katabami, Takuyuki, Tsuiki, Mika, Wada, Norio, Ogawa, Yoshihiro, Kawashima, Junji, Sone, Masakatsu, Kamemura, Kohei, Yoshimoto, Takanobu, Matsuda, Yuichi, Fujita, Megumi, Kobayashi, Hiroki, Watanabe, Minemori, Tamura, Kouichi, Okamura, Shintaro, Miyauchi, Shozo, Izawa, Shoichiro, Chiba, Yoshiro, Tanabe, Akiyo, and Naruse, Mitsuhide
- Published
- 2019
- Full Text
- View/download PDF
15. Impact of adrenocorticotropic hormone stimulation during adrenal venous sampling on outcomes of primary aldosteronism
- Author
-
Takeda, Yoshiyu, Umakoshi, Hironobu, Takeda, Yoshimichi, Yoneda, Takashi, Kurihara, Isao, Katabami, Takuyuki, Ichijo, Takamasa, Wada, Norio, Yoshimoto, Takanobu, Ogawa, Yoshihiro, Kawashima, Junji, Sone, Masakatsu, Takahashi, Katsutoshi, Watanabe, Minemori, Matsuda, Yuichi, Kobayashi, Hiroki, Shibata, Hirotaka, Kamemura, Kohei, Otsuki, Michio, Fujii, Yuichi, Yamamto, Koichi, Ogo, Atsushi, Yanase, Toshihiko, Suzuki, Tomoko, and Naruse, Mitsuhide
- Published
- 2019
- Full Text
- View/download PDF
16. Prevalence of Cardiovascular Disease and Its Risk Factors in Primary Aldosteronism: A Multicenter Study in Japan
- Author
-
Ohno, Youichi, Sone, Masakatsu, Inagaki, Nobuya, Yamasaki, Toshinari, Ogawa, Osamu, Takeda, Yoshiyu, Kurihara, Isao, Itoh, Hiroshi, Umakoshi, Hironobu, Tsuiki, Mika, Ichijo, Takamasa, Katabami, Takuyuki, Tanaka, Yasushi, Wada, Norio, Shibayama, Yui, Yoshimoto, Takanobu, Ogawa, Yoshihiro, Kawashima, Junji, Takahashi, Katsutoshi, Fujita, Megumi, Watanabe, Minemori, Matsuda, Yuichi, Kobayashi, Hiroki, Shibata, Hirotaka, Kamemura, Kohei, Otsuki, Michio, Fujii, Yuichi, Yamamoto, Koichi, Ogo, Atsushi, Okamura, Shintaro, Miyauchi, Shozo, Fukuoka, Tomikazu, Izawa, Shoichiro, Yoneda, Takashi, Hashimoto, Shigeatsu, Yanase, Toshihiko, Suzuki, Tomoko, Kawamura, Takashi, Tabara, Yasuharu, Matsuda, Fumihiko, Naruse, Mitsuhide, Kawaguchi, Takahisa, Setoh, Kazuya, Matsuda, Fumihiko, Takahashi, Yoshimitsu, Nakayama, Takeo, and Kosugi, Shinji
- Published
- 2018
- Full Text
- View/download PDF
17. Reassessment of the cosyntropin stimulation test in the confirmatory diagnosis and subtype classification of primary aldosteronism
- Author
-
Umakoshi, Hironobu, Xiaomei, Yang, Ichijo, Takamasa, Kamemura, Kohei, Matsuda, Yuichi, Fujii, Yuichi, Kai, Tatsuya, Fukuoka, Tomikazu, Sakamoto, Ryuichi, Ogo, Atsushi, Suzuki, Tomoko, Ogasawara, Tatsuki, Tsuiki, Mika, and Naruse, Mitsuhide
- Published
- 2017
- Full Text
- View/download PDF
18. Gas filaments of the cosmic web located around active galaxies in a protocluster
- Author
-
Fumagalli, M., Smail, I., Swinbank, A. M., Cantalupo, S., Sykes, C., Ivison, R. J., Steidel, C. C., Shapley, A. E., Vernet, J., Nakanishi, K., Kajisawa, M., Umehata, Hideki, Matsuda, Yuichi, Yamada, Toru, Tamura, Yoichi, Kubo, Mariko, Hatsukade, Bunyo, Kohno, Kotaro, Umehata, H, Fumagalli, M, Smail, I, Matsuda, Y, Swinbank, A, Cantalupo, S, Sykes, C, Ivison, R, Steidel, C, Shapley, A, Vernet, J, Yamada, T, Tamura, Y, Kubo, M, Nakanishi, K, Kajisawa, M, Hatsukade, B, and Kohno, K
- Subjects
Active galactic nucleus ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Cosmic web ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Radiation ,medicine.disease_cause ,01 natural sciences ,0103 physical sciences ,Cluster (physics) ,medicine ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Physics ,Multidisciplinary ,010308 nuclear & particles physics ,Star formation ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Redshift ,Astrophysics of Galaxies (astro-ph.GA) ,Intergalactic travel ,Ultraviolet ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
著者人数: 18名, Accepted: 2019-09-02, 資料番号: SA1190151000
- Published
- 2019
19. Optimum position of left adrenal vein sampling for subtype diagnosis in primary aldosteronism
- Author
-
Umakoshi, Hironobu, Wada, Norio, Ichijo, Takamasa, Kamemura, Kohei, Matsuda, Yuichi, Fuji, Yuichi, Kai, Tatsuya, Fukuoka, Tomikazu, Sakamoto, Ryuichi, Ogo, Atsushi, Suzuki, Tomoko, Tsuiki, Mika, and Naruse, Mitsuhide
- Published
- 2015
- Full Text
- View/download PDF
20. Importance of contralateral aldosterone suppression during adrenal vein sampling in the subtype evaluation of primary aldosteronism
- Author
-
Umakoshi, Hironobu, Tanase-Nakao, Kanako, Wada, Norio, Ichijo, Takamasa, Sone, Masakatsu, Inagaki, Nobuya, Katabami, Takuyuki, Kamemura, Kohei, Matsuda, Yuichi, Fujii, Yuichi, Kai, Tatsuya, Fukuoka, Tomikazu, Sakamoto, Ryuichi, Ogo, Atsushi, Suzuki, Tomoko, Tsuiki, Mika, Shimatsu, Akira, and Naruse, Mitsuhide
- Published
- 2015
- Full Text
- View/download PDF
21. Effect of Intraprocedural Cortisol Measurement on ACTH-stimulated Adrenal Vein Sampling in Primary Aldosteronism.
- Author
-
Kometani, Mitsuhiro, Yoneda, Takashi, Karashima, Shigehiro, Takeda, Yoshiyu, Tsuiki, Mika, Yasoda, Akihiro, Kurihara, Isao, Wada, Norio, Katabami, Takuyuki, Sone, Masakatsu, Ichijo, Takamasa, Tamura, Kouichi, Ogawa, Yoshihiro, Kobayashi, Hiroki, Okamura, Shintaro, Inagaki, Nobuya, Kawashima, Junji, Fujita, Megumi, Oki, Kenji, and Matsuda, Yuichi
- Subjects
HYPERALDOSTERONISM ,HYDROCORTISONE ,VEINS ,ADRENOCORTICOTROPIC hormone - Abstract
Context Adrenocorticotropin (ACTH) loading is used to increase the success rate of adrenal vein sampling (AVS). Objective We aimed to determine the effect of intraprocedural cortisol measurement (ICM) on ACTH-stimulated AVS (AS-AVS) owing to a lack of reliable data on this topic. Methods This multicenter, retrospective, observational study took place in 28 tertiary centers in Japan. Among 4057 patients enrolled, 2396 received both basal AVS (B-AVS) and AS-AVS and were divided into 2 groups according to whether ICM was used. The effect of ICM on AS-AVS was measured. Results In patients who underwent both AVS procedures, the ICM group had significantly higher success rates for both B-AVS and AS-AVS than the non-ICM group did. However, the probability of failure of AS-AVS after a successful B-AVS and the probability of success of AS-AVS after a failed B-AVS were not significantly different in the 2 groups. For subtype diagnosis, propensity-score matching revealed no significant difference between the 2 groups, and the discrepancy rate between B-AVS and AS-AVS for subtype diagnosis was also not significantly different. Conclusion ICM significantly increased the success rate of B-AVS and AS-AVS in protocols in which both AVS procedures were performed and had no effect on subtype diagnosis. However, in protocols in which both AVS procedures were performed, the results suggest ICM may not be necessary when performing AS-AVS if ICM is used only when B-AVS is performed. Our study suggests that ICM during AVS plays an important role and should be recommended. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
22. Where outflows meet inflows: gas kinematics in SSA22 Ly α blob 2 decoded by advanced radiative transfer modelling.
- Author
-
Li, Zhihui, Steidel, Charles C, Gronke, Max, Chen, Yuguang, and Matsuda, Yuichi
- Subjects
RADIATIVE transfer ,KINEMATICS ,INTERSTELLAR medium ,GASES ,GALACTIC evolution ,ACTIVE galactic nuclei - Abstract
We present new spectroscopic observations of Ly α (Ly α) Blob 2 (z ∼ 3.1). We observed extended Ly α emission in three distinct regions, where the highest Ly α surface brightness (SB) centre is far away from the known continuum sources. We searched through the MOSFIRE slits that cover the high Ly α SB regions, but were unable to detect any significant nebular emission near the highest SB centre. We further mapped the flux ratio of the blue peak to the red peak and found it is anticorrelated with Ly α SB with a power-law index of ∼ –0.4. We used radiative transfer models with both multiphase, clumpy, and shell geometries and successfully reproduced the diverse Ly α morphologies. We found that most spectra suggest outflow-dominated kinematics, while 4/15 spectra imply inflows. A significant correlation exists between parameter pairs, and the multiphase, clumpy model may alleviate previously reported discrepancies. We also modelled Ly α spectra at different positions simultaneously and found that the variation of the inferred clump outflow velocities can be approximately explained by line-of-sight projection effects. Our results support the 'central powering + scattering' scenario, i.e. the Ly α photons are generated by a central powering source and then scatter with outflowing, multiphase H i gas while propagating outwards. The infalling of cool gas near the blob outskirts shapes the observed blue-dominated Ly α profiles, but its energy contribution to the total Ly α luminosity is less than 10 per cent, i.e. minor compared to the photoionization by star-forming galaxies and/or AGNs. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
23. Pulmonary tumor thrombotic microangiopathy showing aggressive course after transurethral resection of urinary bladder: an autopsy case report
- Author
-
Hirano, Hiroshi, Ichibori, Hirotoshi, Kizaki, Tomohiko, Matsumoto, Takuya, Ohka, Zyunichi, Mori, Takeshige, Okamoto, Masanobu, Ogasawara, Daisuke, Kamemura, Kohei, Yoshikawa, Ryohei, Itagaki, Takeshi, Matsuda, Yuichi, and Sano, Hiroshi
- Published
- 2012
- Full Text
- View/download PDF
24. Detection of nitrogen and oxygen in a galaxy at the end of reionization.
- Author
-
Tadaki, Ken-ichi, Tsujita, Akiyoshi, Tamura, Yoichi, Kohno, Kotaro, Hatsukade, Bunyo, Iono, Daisuke, Lee, Minju M, Matsuda, Yuichi, Michiyama, Tomonari, Nagao, Tohru, Nakanishi, Kouichiro, Nishimura, Yuri, Saito, Toshiki, Umehata, Hideki, and Zavala, Jorge
- Subjects
COMPACT discs ,ACTINIC flux ,GALAXIES ,STAR formation ,STELLAR mass ,SURFACE brightness (Astronomy) ,NITROGEN - Abstract
We present observations of [N ii ] 205 μm, [O iii ] 88 μm, and dust emission in a strongly-lensed, submillimeter galaxy (SMG) at z = 6.0, G09.83808, with the Atacama Large Millimeter/submillimeter Array (ALMA). Both [N ii ] and [O iii ] line emissions are detected at >12σ in the |${0{^{\prime \prime}_{.}}8}$| -resolution maps. Lens modeling indicates that the spatial distribution of the dust continuum emission is well characterized by a compact disk with an effective radius of 0.64 ± 0.02 kpc and a high infrared surface brightness of Σ
IR = (1.8 ± 0.3) × 1012 L⊙ kpc−2 . This result supports that G09.83808 is the progenitor of compact quiescent galaxies at z ∼ 4, where the majority of its stars are expected to be formed through a strong and short burst of star formation. G09.83808 and other lensed SMGs show a decreasing trend in the [N ii ] line to infrared luminosity ratio with increasing continuum flux density ratio between 63 and 158 μm, as seen in local luminous infrared galaxies (LIRGs). The decreasing trend can be reproduced by photoionization models with increasing ionization parameters. Furthermore, by combining the [N ii ]/[O iii ] luminosity ratio with far-infrared continuum flux density ratio in G09.83808, we infer that the gas phase metallicity is already Z ≈ 0.5–0.7 Z⊙ . G09.83808 is likely one of the earliest galaxies that has been chemically enriched at the end of reionization. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
25. 3D Distribution Map of HI Gas and Galaxies Around an Enormous Ly$\alpha$ Nebula and Three QSOs at $z=2.3$ Revealed by the HI Tomographic Mapping Technique
- Author
-
Mukae, Shiro, Ouchi, Masami, Cai, Zheng, Lee, Khee-Gan, Prochaska, J. Xavier, Cantalupo, Sebastiano, Zheng, Zheng, Nagamine, Kentaro, Suzuki, Nao, Silverman, John D., Misawa, Toru, Inoue, Akio K., Hennawi, Joseph F., Matsuda, Yuichi, Mawatari, Ken, Sugahara, Yuma, Kojima, Takashi, Ono, Yoshiaki, Shibuya, Takatoshi, Harikane, Yuichi, Fujimoto, Seiji, Chiang, Yi-Kuan, Zhang, Haibin, and Kakuma, Ryota
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
We present an IGM HI tomography map in a survey volume of $16 \times 19 \times 131 \ h^{-3} {\rm comoving \ Mpc}^{3}$ (cMpc$^3$) centered at MAMMOTH-1 nebula and three neighbouring quasars at $z=2.3$. MAMMOTH-1 nebula is an enormous Ly$\alpha$ nebula (ELAN), hosted by a type-II quasar dubbed MAMMOTH1-QSO, that extends over $1\ h^{-1}$ cMpc with not fully clear physical origin. Here we investigate the HI-gas distribution around MAMMOTH1-QSO with the ELAN and three neighbouring type-I quasars, making the IGM HI tomography map with a spatial resolution of $2.6\ h^{-1}$ cMpc. Our HI tomography map is reconstructed with HI Ly$\alpha$ forest absorption of bright background objects at $z=2.4-2.9$: one eBOSS quasar and 16 Keck/LRIS galaxy spectra. We estimate the radial profile of HI flux overdensity for MAMMOTH1-QSO, and find that MAMMOTH1-QSO resides in a volume with significantly weak HI absorption. This suggests that MAMMOTH1-QSO has a proximity zone where quasar illuminates and photo-ionizes the surrounding HI gas and suppresses HI absorption, and that the ELAN is probably a photo-ionized cloud embedded in the cosmic web. The HI radial profile of MAMMOTH1-QSO is very similar to those of three neighbouring type-I quasars at $z=2.3$, which is compatible with the AGN unification model. We compare the distributions of the HI absorption and star-forming galaxies in our survey volume, and identify a spatial offset between density peaks of star-forming galaxies and HI gas. This segregation may suggest anisotropic UV background radiation created by star-forming galaxy density fluctuations., Comment: 15 pages, 9 figures. Accepted for Publication in ApJ
- Published
- 2019
26. Spatial correlation between submillimetre and Lyman-α galaxies in the SSA22 protocluster
- Author
-
Tamura, Yoichi, Kohno, Kotaro, Nakanishi, Kouichiro, Hatsukade, Bunyo, Iono, Daisuke, Wilson, Grant W., Yun, Min S., Takata, Tadafumi, Matsuda, Yuichi, Tosaki, Tomoka, Ezawa, Hajime, Perera, Thushara A., Scott, Kimberly S., Austermann, Jason E., Hughes, David H., Aretxaga, Itziar, Chung, Aeree, Oshima, Tai, Yamaguchi, Nobuyuki, Tanaka, Kunihiko, and Kawabe, Ryohei
- Published
- 2009
- Full Text
- View/download PDF
27. Distribution of IR and Submillimeter Line Emitting Galaxies in Cosmological Simulations
- Author
-
Hayatsu, Natsuki, Yoshida, Naoki, and Matsuda, Yuichi
- 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, We present a forecast for detection of high-redshift star-forming galaxies using SPICA-SAFARI and ALMA Band 10-11. We use the outputs of large cosmological simulations of galaxy formation to calculate the fluxes of infrared and far-infrared emission lines ([O III]88.3 μm, [O III] 51.8 μm, [N III]57.2 μm and [C II]158 μm). To this end, we assume empirical relations between the line fluxes and the star formation rate or far-infrared luminoisities. We consider a large survey programme with a 2′× 2′ field-of-view and the limiting flux densities of greater than 21 and greater than 32 μJy (5σ). Our models predicts that there are 604 plus or minus59 galaxies to be detected by such a survey. The number of [C II] emitters with L[C II] less than 10(exp 9)solar luminosity is expected to be 543 plus or minus 52., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA1730027020, レポート番号: JAXA-SP-17-010E
- Published
- 2018
28. A galaxy at a redshift z = 6.96
- Author
-
Iye, Masanori, Ota, Kazuaki, Kashikawa, Nobunari, Furusawa, Hisanori, Hashimoto, Tetsuya, Hattori, Takashi, Matsuda, Yuichi, Morokuma, Tomoki, Ouchi, Masami, and Shimasaku, Kazuhiro
- Published
- 2006
29. A Massive Quiescent Galaxy Confirmed in a Protocluster at z = 3.09.
- Author
-
Kubo, Mariko, Umehata, Hideki, Matsuda, Yuichi, Kajisawa, Masaru, Steidel, Charles C., Yamada, Toru, Tanaka, Ichi, Hatsukade, Bunyo, Tamura, Yoichi, Nakanishi, Kouichiro, Kohno, Kotaro, Lee, Kianhong, and Matsuda, Keiichi
- Subjects
GALAXY clusters ,SPECTRAL energy distribution ,STELLAR evolution ,STAR formation ,GALAXY mergers ,IR spectrometers ,STELLAR mass - Abstract
We report a massive quiescent galaxy at spectroscopically confirmed at a protocluster in the SSA22 field by detecting the Balmer and Ca ii absorption features with the multi-object spectrometer for infrared exploration on the Keck I telescope. This is the most distant quiescent galaxy confirmed in a protocluster to date. We fit the optical to mid-infrared photometry and spectrum simultaneously with spectral energy distribution (SED) models of parametric and nonparametric star formation histories (SFHs). Both models fit the observed SED well and confirm that this object is a massive quiescent galaxy with a stellar mass of and , and a star formation rate of SFR/M
⊙ yr−1 < 0.3 and for parametric and nonparametric models, respectively. The SFH from the former modeling is described as an instantaneous starburst whereas that of the latter modeling is longer-lived, but both models agree with a sudden quenching of the star formation at ∼0.6 Gyr ago. This massive quiescent galaxy is confirmed in an extremely dense group of galaxies predicted as a progenitor of a brightest cluster galaxy formed via multiple mergers in cosmological numerical simulations. We discover three new plausible [O iii ]λ5007 emitters at 3.0791 ≤ zspec ≤ 3.0833 serendipitously detected around the target. Two of them just between the target and its nearest massive galaxy are possible evidence of their interactions. They suggest the future great size and stellar mass evolution of this massive quiescent galaxy via mergers. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
30. ALMA Observations of Lyα Blob 1: Multiple Major Mergers and Widely Distributed Interstellar Media.
- Author
-
Umehata, Hideki, Smail, Ian, Steidel, Charles C., Hayes, Matthew, Scott, Douglas, Swinbank, A. M., Ivison, R. J., Nagao, Toru, Kubo, Mariko, Nakanishi, Kouichiro, Matsuda, Yuichi, Ikarashi, Soh, Tamura, Yoichi, and Geach, J. E.
- Subjects
INTERSTELLAR medium ,GRAVITATIONAL interactions ,MOLECULAR weights ,GRAVITATIONAL waves ,GALAXIES ,STAR formation - Abstract
We present observations of a giant Lyα blob (LAB) in the SSA22 protocluster at z = 3.1, SSA22-LAB1, taken with the Atacama Large Millimeter/submillimeter Array. Dust continuum, along with [C ii ] 158 μm and CO(4–3) line emission have been detected in LAB1, showing complex morphology and kinematics across a ∼100 kpc central region. Seven galaxies at z = 3.0987–3.1016 in the surroundings are identified in [C ii ] and dust continuum emission, with two of them potential companions or tidal structures associated with the most massive galaxies. Spatially resolved [C ii ] and infrared luminosity ratios for the widely distributed media (L
[Cɪɪ] /LIR ≈ 10−2 −10−3 ) suggest that the observed extended interstellar media are likely to have originated from star formation activity and the contribution from shocked gas is probably not dominant. LAB1 is found to harbor a total molecular gas mass Mmol = (8.7 ± 2.0) × 1010 M⊙ , concentrated in the core region of the Lyα-emitting area. While (primarily obscured) star formation activity in the LAB1 core is one of the most plausible power sources for the Lyα emission, multiple major mergers found in the core may also play a role in making LAB1 exceptionally bright and extended in Lyα as a result of cooling radiation induced by gravitational interactions. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
31. Physical Characterization of Serendipitously Uncovered Millimeter-wave Line-emitting Galaxies at z ∼ 2.5 behind the Local Luminous Infrared Galaxy VV 114.
- Author
-
Mizukoshi, Shoichiro, Kohno, Kotaro, Egusa, Fumi, Hatsukade, Bunyo, Minezaki, Takeo, Saito, Toshiki, Tamura, Yoichi, Iono, Daisuke, Ueda, Junko, Matsuda, Yuichi, Kawabe, Ryohei, Lee, Minju M., Yun, Min S., and Espada, Daniel
- Subjects
GRAVITATIONAL lenses ,ROTATING disks ,MOLECULAR weights ,GALAXIES ,MAGNITUDE (Mathematics) - Abstract
We present a detailed investigation of millimeter-wave line emitters ALMA J010748.3-173028 (ALMA-J0107a) and ALMA J010747.0-173010 (ALMA-J0107b), which were serendipitously uncovered in the background of the nearby galaxy VV 114 with spectral scan observations at λ = 2–3 mm. Via Atacama Large Millimeter/submillimeter Array (ALMA) detection of CO(4–3), CO(3–2), and [C i ](1–0) lines for both sources, their spectroscopic redshifts are unambiguously determined to be z = 2.4666 ± 0.0002 and z = 2.3100 ± 0.0002, respectively. We obtain the apparent molecular gas masses M
gas of these two line emitters from [C i ] line fluxes as (11.2 ± 3.1) × 1010 M⊙ and (4.2 ± 1.2) × 1010 M⊙ , respectively. The observed CO(4–3) velocity field of ALMA-J0107a exhibits a clear velocity gradient across the CO disk, and we find that ALMA-J0107a is characterized by an inclined rotating disk with a significant turbulence, that is, a deprojected maximum rotation velocity to velocity dispersion ratio of 1.3 ± 0.3. We find that the dynamical mass of ALMA-J0107a within the CO-emitting disk computed from the derived kinetic parameters, (1.1 ± 0.2) × 1010 M⊙ , is an order of magnitude smaller than the molecular gas mass derived from dust continuum emission, (3.2 ± 1.6) × 1011 M⊙ . We suggest this source is magnified by a gravitational lens with a magnification of μ ≳ 10, which is consistent with the measured offset from the empirical correlation between CO-line luminosity and width. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
32. SILVERRUSH. IX. Lyα Intensity Mapping with Star-forming Galaxies at z = 5.7 and 6.6: A Possible Detection of Extended Lyα Emission at ≳100 Comoving Kiloparsecs around and beyond the Virial-radius Scale of Galaxy Dark Matter Halos.
- Author
-
Kakuma, Ryota, Ouchi, Masami, Harikane, Yuichi, Ono, Yoshiaki, Inoue, Akio K., Komiyama, Yutaka, Kusakabe, Haruka, Lee, Chien-Hsiu, Matsuda, Yuichi, Matsuoka, Yoshiki, Mawatari, Ken, Momose, Rieko, Shibuya, Takatoshi, and Taniguchi, Yoshiaki
- Subjects
DARK matter ,GALAXIES ,QUALITY control ,DATA quality ,PHOTONS - Abstract
We present results of the cross-correlation Lyα intensity mapping with Subaru/Hyper Suprime-Cam (HSC) ultra-deep narrowband images and Lyα emitters (LAEs) at z = 5.7 and 6.6 in a total area of 4 deg
2 . Although an overwhelming amount of data quality controls have been performed for the narrowband images, we further conduct extensive analyses evaluating systematics of large-scale point-spread function wings, sky subtractions, and unknown errors based on physically uncorrelated signals and sources found in real HSC images and object catalogs, respectively. Removing the systematics, we carefully calculate cross-correlations between Lyα intensity of the narrowband images and the LAEs. We tentatively identify very diffuse Lyα emission with the ≃3σ (≃2σ) significance at ≳100 comoving kiloparsecs (ckpc) far from the LAEs at z = 5.7 (6.6), around and probably even beyond a virial radius of star-forming galaxies with Mh ∼ 1011 M⊙ . The diffuse Lyα emission possibly extends up to 1000 ckpc with the surface brightness of 10−20 –10−19 erg s−1 cm−2 arcsec−2 . We confirm that the small-scale (<150 ckpc) Lyα radial profiles of LAEs are consistent with those obtained by recent Multi-Unit Spectroscopic Explorer observations. Comparisons with numerical simulations suggest that the large-scale (∼150–1000 ckpc) Lyα emission are not explained by unresolved faint neighboring galaxies including satellites, but by a combination of Lyα photons emitted from the central LAE and other unknown sources, such as cold-gas streams and galactic outflow. We find no evolution in the Lyα radial profiles of our LAEs from z = 5.7 to 6.6, where theoretical models predict a flattening of the profile slope made by cosmic reionization, albeit with our moderately large observational errors. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
33. Spatial correlation between submillimetre and Lyman-α galaxies in the SSA 22 protocluster
- Author
-
Tamura, Yoichi, Kohno, Kotaro, Nakanishi, Kouichiro, Hatsukade3, Bunyo, Iono, Daisuke, Wilson, Grant W., Yun, Min S., Takata, Tadafumi, Matsuda, Yuichi, Tosaki, Tomoka, Ezawa, Hajime, Perera, Thushara A., Scott, Kimberly S., Austermann, Jason E., Hughes, David H., Aretxaga, Itziar, Chung, Aeree, Oshima, Tai, Yamaguchi, Nobuyuki, Tanaka, Kunihiko, and Kawabe, Ryohei
- Subjects
Galaxies -- Observations ,Stars -- Natural history -- Observations ,Environmental issues ,Science and technology ,Zoology and wildlife conservation ,Observations ,Natural history - Abstract
Lyman-α emitters are thought to be young, low-mass galaxies with ages of ~[10.sup.8] yr (refs 1, 2). An overdensity of them in one region of the sky (the SSA 22 [...]
- Published
- 2009
34. Impact of worsening renal function on peak oxygen uptake in patients with acute myocardial infarction.
- Author
-
Ogura, Asami, Izawa, Kazuhiro P., Tawa, Hideto, Kureha, Fumie, Wada, Masaaki, Kanai, Masashi, Kubo, Ikko, Yoshikawa, Ryohei, and Matsuda, Yuichi
- Subjects
MYOCARDIAL infarction ,KIDNEY physiology ,EXERCISE tests ,PERCUTANEOUS coronary intervention ,MULTIPLE regression analysis - Abstract
Aim: Worsening renal function (WRF) induced by acute myocardial infarction (AMI) is a strong predictor of cardiovascular events and mortality. Peak oxygen uptake may contribute to prognosis in AMI patients with WRF, however, the impact of WRF on peak oxygen uptake is unclear. Methods: Among 154 patients with AMI who underwent emergency percutaneous coronary intervention and participated in phase II cardiac rehabilitation, those who underwent cardiopulmonary exercise testing were consecutively enrolled. WRF was defined as a ≥20% decrease in estimated glomerular filtration rate (eGFR [ml/min/1.73 m2]) from admission to that at cardiopulmonary exercise testing. The association of WRF with peak oxygen uptake was evaluated by multivariate regression analysis. The non‐WRF group was divided into two subgroups according to eGFR <60/≥60 at cardiopulmonary exercise testing, and eGFR at cardiopulmonary exercise testing and peak oxygen uptake of all three groups were compared. Results: Ninety‐four patients were enrolled in the final analysis. Multiple linear regression analysis showed that WRF was associated with peak oxygen uptake (p =.003). Comparing the non‐WRF group with eGFR at cardiopulmonary exercise testing <60 and the WRF group, although eGFR at cardiopulmonary exercise testing was similar (p = 1.000), peak oxygen uptake in the WRF group was significantly lower (p =.026). Conclusion: WRF, not eGFR at cardiopulmonary exercise testing was significantly associated with peak oxygen uptake in patients with AMI. This result suggests that when considering the relationship between renal function and peak oxygen uptake, WRF must be taken into account. SUMMARY AT A GLANCE: This is a retrospective cohort study on 94 patients followed for up to 6 months in Japan showing that worsening of kidney function after acute myocardial infarction (MI) is associated with peak oxygen uptake on exercise test, and this association is independent of baseline kidney function. Thus a decline is kidney function post MI may have implications for worse outcomes than the absolute level of kidney function. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
35. GOLDRUSH. III. A Systematic Search of Protoclusters at $z\sim4$ Based on the $>100\,\mathrm{deg^2}$ Area
- Author
-
Toshikawa, Jun, Uchiyama, Hisakazu, Kashikawa, Nobunari, Ouchi, Masami, Overzier, Roderik, Ono, Yoshiaki, Harikane, Yuichi, Ishikawa, Shogo, Kodama, Tadayuki, Matsuda, Yuichi, Lin, Yen-Ting, Onoue, Masafusa, Tanaka, Masayuk, Nagao, Tohru, Akiyama, Masayuki, Komiyama, Yutaka, Goto, Tomotsugu, and Lee, Chien-Hsiu
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
We conduct a systematic search for galaxy protoclusters at $z\sim3.8$ based on the latest internal data release (S16A) of the Hyper SuprimeCam Subaru strategic program (HSC-SSP). In the Wide layer of the HSC-SSP, we investigate the large-scale projected sky distribution of $g$-dropout galaxies over an area of $121\,\mathrm{deg^2}$, and identify 216 large-scale overdense regions ($>4\sigma$ overdensity significance) that are good protocluster candidates. Of these, 37 are located within $8\,\mathrm{arcmin}$ ($3.4\,\mathrm{physicalMpc}$) from other protocluster candidates of higher overdensity, and are expected to merge into a single massive structure by $z=0$. Therefore, we find 179 unique protocluster candidates in our survey. A cosmological simulation that includes projection effects predicts that more than 76\% of these candidates will evolve into galaxy clusters with halo masses of at least $10^{14}\,M_{\odot}$ by $z=0$. The unprecedented size of our protocluster candidate catalog allowed us to perform, for the first time, an angular clustering analysis of the systematic sample of protocluster candidates. We find a correlation length of $35.0\,h^{-1}\,\mathrm{Mpc}$. The relation between correlation length and number density of $z\sim3.8$ protocluster candidates is consistent with the prediction of the $\Lambda$CDM model, and the correlation length is similar to that of rich clusters in the local universe. This result suggests that our protocluster candidates are tracing similar spatial structures as those expected of the progenitors of rich clusters and enhances the confidence that our method to identify protoclusters at high redshifts is robust. In the coming years, our protocluster search will be extended to the entire HSC-SSP Wide sky coverage of $\sim1400\,\mathrm{deg^2}$ to probe cluster formation over a wide redshift range of $z\sim2\mathrm{-}6$., Comment: 11 pages, 8 figures, accepted for publication in PASJ special issue
- Published
- 2017
36. Spatially resolved molecular gas properties of host galaxy of Type I superluminous supernova SN 2017egm.
- Author
-
Hatsukade, Bunyo, Morokuma-Matsui, Kana, Hayashi, Masao, Tominaga, Nozomu, Tamura, Yoichi, Niinuma, Kotaro, Motogi, Kazuhiro, Morokuma, Tomoki, and Matsuda, Yuichi
- Subjects
TYPE I supernovae ,SUPERNOVAE ,GALAXIES ,MOLECULAR weights - Abstract
We present the results of CO(1–0) observations of the host galaxy of a Type I superluminous supernova (SLSN-I), SN 2017egm, one of the closest SLSNe-I at z = 0.03063, by using the Atacama Large Millimeter/submillimeter Array. The molecular gas mass of the host galaxy is M
gas = (4.8 ± 0.3) × 109 M⊙ , placing it on the sequence of normal star-forming galaxies in an Mgas –star-formation rate (SFR) plane. The molecular hydrogen column density at the location of SN 2017egm is higher than that of the Type II SN PTF10bgl, which is also located in the same host galaxy, and those of other Type II and Ia SNe located in different galaxies, suggesting that SLSNe-I have a preference for a dense molecular gas environment. On the other hand, the column density at the location of SN 2017egm is comparable to those of Type Ibc SNe. The surface densities of molecular gas and the SFR at the location of SN 2017egm are consistent with those of spatially resolved local star-forming galaxies and follow the Schmidt–Kennicutt relation. These facts suggest that SLSNe-I can occur in environments with the same star-formation mechanism as in normal star-forming galaxies. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
37. Large Population of ALMA Galaxies at z > 6 with Very High [O iii] 88 μm to [C ii] 158 μm Flux Ratios: Evidence of Extremely High Ionization Parameter or PDR Deficit?
- Author
-
Harikane, Yuichi, Ouchi, Masami, Inoue, Akio K., Matsuoka, Yoshiki, Tamura, Yoichi, Bakx, Tom, Fujimoto, Seiji, Moriwaki, Kana, Ono, Yoshiaki, Nagao, Tohru, Tadaki, Ken-ichi, Kojima, Takashi, Shibuya, Takatoshi, Egami, Eiichi, Ferrara, Andrea, Gallerani, Simona, Hashimoto, Takuya, Kohno, Kotaro, Matsuda, Yuichi, and Matsuo, Hiroshi
- Subjects
GALAXIES ,MICROWAVE attenuation ,COSMIC background radiation ,INTERSTELLAR medium - Abstract
We present our new Atacama Large Millimeter/Submillimeter Array (ALMA) observations targeting [O iii ]88 μm, [C ii ]158 μm, [N ii ]122 μm, and dust-continuum emission for three Lyman break galaxies at z = 6.0293–6.2037, identified in the Subaru/Hyper Suprime-Cam survey. We clearly detect [O iii ] and [C ii ] lines from all of the galaxies at 4.3–11.8σ levels, and identify multi-band dust-continuum emission in two of the three galaxies, allowing us to estimate infrared luminosities and dust temperatures simultaneously. In conjunction with previous ALMA observations for six galaxies at z > 6, we confirm that all the nine z = 6–9 galaxies have high [O iii ]/[C ii ] ratios of , ∼10 times higher than z ∼ 0 galaxies. We also find a positive correlation between the [O iii ]/[C ii ] ratio and the Lyα equivalent width (EW) at the ∼90% significance level. We carefully investigate physical origins of the high [O iii ]/[C ii ] ratios at z = 6–9 using Cloudy, and find that high density of the interstellar medium, low C/O abundance ratio, and the cosmic microwave background attenuation are responsible to only a part of the z = 6–9 galaxies. Instead, the observed high [O iii ]/[C ii ] ratios are explained by 10–100 times higher ionization parameters or low photodissociation region (PDR) covering fractions of 0%–10%, both of which are consistent with our [N ii ] observations. The latter scenario can be reproduced with a density-bounded nebula with PDR deficit, which would enhance the Lyα, Lyman continuum, and ionizing photons escape from galaxies, consistent with the [O iii ]/[C ii ]-Lyα EW correlation we find. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
38. Three-dimensional Distribution Map of H i Gas and Galaxies around an Enormous Lyα Nebula and Three QSOs at z = 2.3 Revealed by the H i Tomographic Mapping Technique.
- Author
-
Mukae, Shiro, Ouchi, Masami, Cai, Zheng, Lee, Khee-Gan, Prochaska, J. Xavier, Cantalupo, Sebastiano, Ono, Yoshiaki, Zheng, Zheng, Nagamine, Kentaro, Suzuki, Nao, Silverman, John D., Misawa, Toru, Inoue, Akio K., Hennawi, Joseph F., Matsuda, Yuichi, Mawatari, Ken, Sugahara, Yuma, Kojima, Takashi, Shibuya, Takatoshi, and Harikane, Yuichi
- Subjects
QUASARS ,BACKGROUND radiation ,GALAXIES ,NEBULAE ,GALAXY spectra ,ULTRAVIOLET radiation - Abstract
We present an IGM H i tomographic map in a survey volume of (cMpc
3 ) centered at MAMMOTH-1 nebula and three neighboring quasars at z = 2.3. The MAMMOTH-1 nebula is an enormous Lyα nebula (ELAN), hosted by a type-II quasar dubbed MAMMOTH1-QSO, that extends over cMpc with no clear physical origin. Here we investigate the H i -gas distribution around MAMMOTH1-QSO with the ELAN and three neighboring type-I quasars, making the IGM H i tomographic map with a spatial resolution of 2.6 h−1 cMpc. Our H i tomographic map is reconstructed with H i Lyα forest absorption of bright background objects at z = 2.4–2.9: one eBOSS quasar and 16 Keck/LRIS galaxy spectra. We estimate the radial profile of H i overdensity for MAMMOTH1-QSO, and find that MAMMOTH1-QSO resides in a volume with fairly weak H i absorption. This suggests that MAMMOTH1-QSO may have a proximity zone where quasar illuminates and photoionizes the surrounding H i gas and suppresses H i absorption, and that the ELAN is probably a photoionized cloud embedded in the cosmic web. The H i radial profile of MAMMOTH1-QSO is very similar to those of three neighboring type-I quasars at z = 2.3, which is compatible with the AGN unification model. We compare the distributions of the H i absorption and star-forming galaxies in our survey volume, and identify a spatial offset between density peaks of star-forming galaxies and H i gas. This segregation may suggest anisotropic UV background radiation created by star-forming galaxy density fluctuations. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
39. ALMA uncovers the [C ii] emission and warm dust continuum in a z = 8.31 Lyman break galaxy.
- Author
-
Bakx, Tom J L C, Tamura, Yoichi, Hashimoto, Takuya, Inoue, Akio K, Lee, Minju M, Mawatari, Ken, Ota, Kazuaki, Umehata, Hideki, Zackrisson, Erik, Hatsukade, Bunyo, Kohno, Kotaro, Matsuda, Yuichi, Matsuo, Hiroshi, Okamoto, Takashi, Shibuya, Takatoshi, Shimizu, Ikkoh, Taniguchi, Yoshiaki, and Yoshida, Naoki
- Subjects
DUST ,CONFIDENCE intervals ,INTERSTELLAR medium ,GALAXIES ,SUBMILLIMETER astronomy ,QUASARS - Abstract
We report on the detection of the [C ii ] 157.7 μ m emission from the Lyman break galaxy (LBG) MACS0416_Y1 at z = 8.3113, by using the Atacama Large Millimeter/submillimeter Array (ALMA). The luminosity ratio of [O iii ] 88 μ m (from previous campaigns) to [C ii ] is 9.3 ± 2.6, indicative of hard interstellar radiation fields and/or a low covering fraction of photodissociation regions. The emission of [C ii ] is cospatial to the 850 μ m dust emission (90 μ m rest frame, from previous campaigns), however the peak [C ii ] emission does not agree with the peak [O iii ] emission, suggesting that the lines originate from different conditions in the interstellar medium. We fail to detect continuum emission at 1.5 mm (160 μ m rest frame) down to 18 μ Jy (3σ). This non-detection places a strong limits on the dust spectrum, considering the 137 ± 26 μ Jy continuum emission at 850 μ m. This suggests an unusually warm dust component (T > 80 K, 90 per cent confidence limit), and/or a steep dust-emissivity index (β
dust > 2), compared to galaxy-wide dust emission found at lower redshifts (typically T ∼ 30–50 K, βdust ∼ 1–2). If such temperatures are common, this would reduce the required dust mass and relax the dust production problem at the highest redshifts. We therefore warn against the use of only single-wavelength information to derive physical properties, recommend a more thorough examination of dust temperatures in the early Universe, and stress the need for instrumentation that probes the peak of warm dust in the Epoch of Reionization. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
40. Effect of cosyntropin during adrenal venous sampling on subtype of primary aldosteronism: analysis of surgical outcome.
- Author
-
Kobayashi, Hiroki, Nakamura, Yoshihiro, Abe, Masanori, Kurihara, Isao, Itoh, Hiroshi, Ichijo, Takamasa, Takeda, Yoshiyu, Yoneda, Takashi, Katabami, Takuyuki, Tsuiki, Mika, Wada, Norio, Ogawa, Yoshihiro, Sakamoto, Ryuichi, Kawashima, Junji, Sone, Masakatsu, Inagaki, Nobuya, Yoshimoto, Takanobu, Yamada, Tetsuya, Okamoto, Ryuji, and Matsuda, Yuichi
- Subjects
HYPERALDOSTERONISM ,ADRENOCORTICOTROPIC hormone - Abstract
Objectives: We investigated the clinical significance of ACTH stimulation d uring adrenal venous sampling (AVS) by surgical outcome of primary aldosteronism (PA). Design: Multicenter retrospective study by Japan PA study. Method: We allocated 314 patients with both basal and ACTH-stimulated AVS data who underwent adrenalectomy to three groups: basal lateralization index (LI) =2 with ACTH-stimulated LI =4 on the ipsilateral side (Unilateral (U) to U group, n = 245); basal LI <2 with ACTH-stimulated LI =4 (Bilateral (B) to U group, n = 15); and basal LI =2 with ACTH-stimulated LI <4 (U to B group, n = 54). We compared surgical outcomes among the groups using the Primary Aldosteronism Surgical Outcome (PASO) criteria. Results: Compared with U to U group, U to B group had poor clinical and biochemical outcomes and low rates of adrenal adenoma as pathological findings (P = 0.044, 0.006, and 0.048, respectively), although there were no significant differences between U to U and B to U groups. All patients in U to B group with clinical and biochemical benefits, however, had adrenal adenoma as pathological findings and could be well differentiated from those with poor surgical outcomes via basal LI (>8.3), but not ACTH-stimulated LI. These results were similar ev en when we defined each group based on a cut-off value of 4 for basal LI. Conclusions: Although PA patients in U to B group had worse surgical outcom es than did those in U to U group, basal LI could discriminate among patients with better surgical outcomes in U to B group. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
41. Predictors of Clinical Success After Surgery for Primary Aldosteronism in the Japanese Nationwide Cohort.
- Author
-
Morisaki, Mitsuha, Kurihara, Isao, Itoh, Hiroshi, Naruse, Mitsuhide, Takeda, Yoshiyu, Katabami, Takuyuki, Ichijo, Takamasa, Wada, Norio, Yoshimoto, Takanobu, Ogawa, Yoshihiro, Sone, Masakatsu, Tsuiki, Mika, Shibata, Hirotaka, Kawashima, Junji, Fujita, Megumi, Watanabe, Minemori, Matsuda, Yuichi, Kobayashi, Hiroki, Suzuki, Tomoko, and Group, JPAS Study
- Subjects
HYPERALDOSTERONISM ,BLOOD pressure ,ADRENALECTOMY - Abstract
Context Aldosterone-producing adenomas are a curable subtype of primary aldosteronism (PA); however, hypertension persists in some patients after adrenalectomy. Objective To identify factors associated with, and develop prediction models for, blood pressure (BP) normalization or improvement after adrenalectomy. Design Retrospective analysis of patients treated between 2006 and 2018, with a 6-month follow-up. Setting A nationwide, 29-center Japanese registry encompassing 15 university hospitals and 14 city hospitals. Patients We categorized 574 participants in the Japan Primary Aldosteronism Study, who were diagnosed with PA and underwent adrenalectomy, as BP normalized or improved, on the basis of their presentations at 6 months postsurgery. Main Outcome Measure The rate of complete, partial, and absent clinical success. Predictive factors related to BP outcomes after PA surgery were also evaluated. Results Complete clinical success was achieved in 32.6% and partial clinical success was achieved in 53.0% of the patients at 6 months postsurgery. The following five variables were independent predictors for BP normalization: ≤7 years of hypertension, body mass index ≤25 kg/m
2 , no more than one antihypertensive medication, absence of medical history of diabetes, and female sex. The area under the receiver operator characteristic curve was 0.797 in the BP normalization model. Conclusion We established models that predicted postoperative BP normalization in patients with PA. These should be useful for shared decision-making regarding adrenalectomy for PA. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
42. Subaru narrow-band imaging search for Lyman continuum from galaxies at z > 3 in the GOODS-N field.
- Author
-
Iwata, Ikuru, Inoue, Akio K, Micheva, Genoveva, Matsuda, Yuichi, and Yamada, Toru
- Subjects
ACTIVE galactic nuclei ,ACTINIC flux ,GALAXIES - Abstract
We report results of a search for galaxies at z > 3 with Lyman continuum (LyC) emission using a narrow-band filter NB359 with Subaru/Suprime-Cam in an ∼800 arcmin
2 blank field around the GOODS-N. We use 103 star-forming galaxies (SFGs) and 8 active galactic nuclei (AGNs) with spectroscopic redshifts in a range between 3.06 and 3.5 and 157 photometrically selected z = 3.1 Lyman α emitter (LAE) candidates as the targets. After removing galaxies spectroscopically confirmed to be contaminated by foreground sources, we found two SFGs and one AGN as candidate LyC-emitting sources among the targets with spectroscopic redshifts. Among LAE candidates, five sources are detected in the NB359 image, and three among them may be contaminated by foreground sources. We compare the sample galaxies in the GOODS-N with those in the SSA22, where a prominent protocluster at z = 3.1 is known and an LyC search using the same NB359 filter has been made. The frequency of galaxies with LyC leakage in the SSA22 field may be about two times higher than that of galaxies in the GOODS-N with the sample ultraviolet (UV) magnitude range, although the numbers of LyC detections in these fields are too small to make a statistically significant conclusion. By combining the sample galaxies in these fields, we place the 3σ upper limits of the observed LyC-to-UV flux density ratio and LyC escape fraction for galaxies at z = 3.1 with absolute UV magnitude MUV < −18.8 as (fLyC / fUV )obs < 0.036 and |$f_\mathrm{esc}^\mathrm{abs}\,\lt\, 8$| per cent, respectively. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
43. Herschel protocluster survey: A search for dusty star-forming galaxies in protoclusters at z=2-3
- Author
-
Kato, Y., Smail, Ian, Swinbank, A. M., Saito, T., Erb, D. K., Lehmer, B. D., Geach, J. E., Steidel, C. C., Alexander, D. M., Matsuda, Yuichi, Hatsukade, Bunyo, Umehata, Hideki, Tanaka, Ichi, Iono, Daisuke, Tamura, Yoichi, Kohno, Kotaro, Yamada, Toru, and Hayashino, Tomoki
- Subjects
Luminous infrared galaxy ,Physics ,galaxies: high ,010308 nuclear & particles physics ,FOS: Physical sciences ,Astronomy ,Astronomy and Astrophysics ,Astrophysics ,redshift ,01 natural sciences ,Astrophysics - Astrophysics of Galaxies ,Redshift ,Galaxy ,infrared: galaxies ,Spire ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,galaxies: formation ,submillimetre: galaxies ,010303 astronomy & astrophysics - Abstract
著者人数: 18名, Accepted: 2016-05-19, 資料番号: SA1160054000
- Published
- 2016
44. A Resolved Map of the Infrared Excess in a Lyman Break Galaxy at z = 3
- Author
-
Koprowski, M. P., Coppin, K. E. K., Geach, J. E., Hine, N. K., Bremer, M., Chapman, S., Davies, L. J. M., Knudsen, K. K., Kubo, M., Lehmer, B. D., Smith, D. J. B., van, der Werf P. P., Violino, G., Hayashino, Tomoki, Matsuda, Yuichi, and Yamada, Toru
- Subjects
submillimeter: galaxies ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Infrared ,galaxies [submillimeter] ,FOS: Physical sciences ,Astrophysics ,01 natural sciences ,Submillimeter Array ,galaxies: high-redshift ,0103 physical sciences ,ISM [submillimeter] ,010303 astronomy & astrophysics ,Physics ,Infrared excess ,ISM [galaxies] ,010308 nuclear & particles physics ,Star formation ,extinction ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,Spectral energy distribution ,submillimeter: ISM ,Millimeter ,dust ,dust, extinction ,Lyman-break galaxy ,high-redshift [galaxies] ,galaxies: ISM ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
著者人数: 16名, Accepted: 2016-08-15, 資料番号: SA1160106000
- Published
- 2016
45. SXDF-UDS-CANDELS-ALMA 1.5 arcmin2 deep survey
- Author
-
Kohno, Kotaro, Tamura, Yoichi, Yamaguchi, Yuki, Umehata, Hideki, Rujopakarn, Wiphu, Lee, Minju, Motohara, Kentaro, Makiya, Ryu, Izumi, Takuma, Ivison, Rob, Ikarashi, Soh, Tadaki, Ken-ichi, Kodama, Tadayuki, Hatsukade, Bunyo, Yabe, Kiyoto, Hayashi, Masao, Iono, Daisuke, Matsuda, Yuichi, Nakanishi, Kouichiro, Kawabe, Ryohei, Wilson, Grant, Yun, Min S., Hughes, David, Caputi, Karina, Dunlop, James, and Astronomy
- Abstract
We have conducted 1.1 mm ALMA observations of a contiguous 105″ × 50″ or 1.5 arcmin2 window (achieved by 19 point mosaic) in the SXDF-UDS-CANDELS. We achieved a 5σ sensitivity of 0.28 mJy, giving a flat sensus of dusty star-forming galaxies with LIR ~6 × 1011 L⊙ (if Tdust = 40 K) or SFR ~100 M⊙ yr-1 up to z~10 thanks to the negative K-correction at this wavelength. We detect 5 brightest sources (S/N>6) and 18 low-significant sources (5 > S/N > 4; they may contain spurious detections, though) in the field. We find that these discrete sources are responsible for a faint filamentary emission seen in low-resolution (~30″) heavily confused AzTEC 1.1mm and SPIRE 0.5mm images. One of the 5 brightest ALMA sources is very dark in deep WFC3 and HAWK-I NIR images as well as VLA 1.4 GHz images, demonstrating that deep ALMA imaging can unveil new obscured star-forming galaxy population.
- Published
- 2015
46. High-resolution ALMA observations of SDP.81. I. The innermost mass profile of the lensing elliptical galaxy probed by 30 milli-arcsecond images
- Author
-
Tamura, Yoichi, Oguri, Masamune, Iono, Daisuke, Hatsukade, Bunyo, Matsuda, Yuichi, and Hayashi, Masao
- Subjects
Astrophysics of Galaxies (astro-ph.GA) ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Astrophysics::Galaxy Astrophysics - Abstract
We report a detailed modeling of a mass profile of a $z = 0.2999$ massive elliptical galaxy using 30 milli-arcsecond resolution 1-mm Atacama Large Millimeter/submillimeter Array (ALMA) images of the galaxy-galaxy lensing system SDP.81. The detailed morphology of the lensed multiple images of the $z = 3.042$ infrared-luminous galaxy, which is found to consist of tens of $\lesssim 100$-pc-sized star-forming clumps embedded in a $\sim 2$ kpc disk, are well reproduced by a lensing galaxy modeled by an isothermal ellipsoid with a 400 pc core. The core radius is consistent with that of the visible stellar light, and the mass-to-light ratio of $\sim 2\,M_{\odot}\,L_{\odot}^{-1}$ is comparable to the locally measured value, suggesting that the inner 1 kpc region is dominated by luminous matter. The position of the predicted mass centroid is consistent to within $\simeq 30$ mas with that of a non-thermal source detected with ALMA, which likely traces an active galactic nucleus of the foreground elliptical galaxy. A point source mass of $> 3 \times 10^8\,M_{\odot}$ mimicking a supermassive black hole is required to explain the non-detection of a central image of the background galaxy, although the black hole mass degenerates with the core radius of the elliptical galaxy. The required mass is consistent with that predicted from the well-known correlation between black hole mass and host velocity dispersion. Our analysis demonstrates the power of ALMA imaging of strong gravitational lensing for studying the innermost mass profiles and the central supermassive black hole of distant elliptical galaxies., Accepted for publication in PASJ; 7 pages, 4 figures, 1 table. The lens model is available at http://www.ioa.s.u-tokyo.ac.jp/~ytamura/SDP81/
- Published
- 2015
47. Clinical and biochemical outcomes after adrenalectomy and medical treatment in patients with unilateral primary aldosteronism.
- Author
-
Katabami, Takuyuki, Fukuda, Hisashi, Tsukiyama, Hidekazu, Tanaka, Yasushi, Takeda, Yoshiyu, Kurihara, Isao, Ito, Hiroshi, Tsuiki, Mika, Ichijo, Takamasa, Wada, Norio, Shibayama, Yui, Yoshimoto, Takanobu, Ogawa, Yoshihiro, Kawashima, Junji, Sone, Masakatsu, Inagaki, Nobuya, Takahashi, Katsutoshi, Fujita, Megumi, Watanabe, Minemori, and Matsuda, Yuichi
- Published
- 2019
- Full Text
- View/download PDF
48. Lateralizing Asymmetry of Adrenal Imaging and Adrenal Vein Sampling in Patients With Primary Aldosteronism.
- Author
-
Wada, Norio, Shibayama, Yui, Yoneda, Takashi, Katabami, Takuyuki, Kurihara, Isao, Tsuiki, Mika, Ichijo, Takamasa, Ogawa, Yoshihiro, Kawashima, Junji, Sone, Masakatsu, Yoshimoto, Takanobu, Matsuda, Yuichi, Fujita, Megumi, Kobayashi, Hiroki, Tamura, Kouichi, Kamemura, Kohei, Otsuki, Michio, Okamura, Shintaro, Naruse, Mitsuhide, and Group, JPAS/JRAS Study
- Subjects
HYPERALDOSTERONISM ,COMPUTED tomography ,DIAGNOSTIC errors - Abstract
Context In patients with primary aldosteronism (PA), it remains unclear whether aldosterone-producing adenomas are likely to develop in the left or right adrenal gland. Objective To investigate left-right differences of PA laterality diagnoses via CT imaging and adrenal vein sampling (AVS). Design Retrospective, observational study. Patients From the Japan Primary Aldosteronism Study, 1493 patients with PA were enrolled who underwent CT and ACTH-stimulated AVS. Measurements Left or right adrenal nodular lesion distribution and laterality observed on CT scans and from AVS were noted. Results Both on CT scans and AVS, unilateral results were observed more frequently on the left side than on the right side (25.1% vs 15.4% and 17.3% vs 13.5%, respectively; P < 0.01for both diagnostic techniques). There was no significant difference in the concordance rate for CT and AVS between patients with left and right unilateral nodular lesions observed on CT scans (44.1% and 50.9%, respectively; P = 0.15). In patients with nodules <20 mm, the concordance rate was significantly greater on the right side than the left side (45.8% vs 56.4%; P = 0.03). In patients with bilateral results of AVS, unilateral nodular lesions were detected more frequently on the left side than the right side (17.8% vs 9.4%; P < 0.01). Conclusion These results suggest aldosterone-producing adenomas and nonfunctioning tumors are more likely to develop on the left side in patients with PA and that misdiagnosis of CT-based lateralization may occur more frequently on the left side. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
49. The SCUBA-2 web survey: I. Observations of CO(3–2) in hyper-luminous QSO field.
- Author
-
Hill, Ryley, Chapman, Scott C, Scott, Douglas, Smail, Ian, Steidel, Charles C, Krips, Melanie, Babul, Arif, Berg, Trystyn, Bertoldi, Frank, Gao, Yu, Lacaille, Kevin, Matsuda, Yuichi, Ross, Colin, Rudie, Gwen, and Trainor, Ryan
- Subjects
INTERNET surveys ,SUBMILLIMETER astronomy ,BLACK holes ,INTERSTELLAR medium ,MAGNITUDE (Mathematics) ,ACTINIC flux - Abstract
A primary goal of the Submillimetre Common User Bolometer Array-2 web survey is to perform tomography of the early intergalactic medium by studying systems containing some of the brightest quasi-stellar objects (QSOs; 2.5 |$\, {\lt }\, z\, {\lt }\,$| 3.0) and nearby submillimetre galaxies (SMGs). As a first step, this paper aims to characterize the galaxies that host the QSOs. To achieve this, a sample of 13 hyper-luminous (|$L_{\rm AGN}\, {\gt }\, 10^{14}\, {\rm L}_{\odot }$|) QSOs with previous submillimetre continuum detections were followed up with CO(3–2) observations using the NOrthern Extended Millimeter Array interferometer. All but two of the QSOs are detected in CO(3–2); for one non-detection, our observations show a tentative 2σ line at the expected position and redshift, and for the other non-detection we find only continuum flux density an order of magnitude brighter than the other sources. In three of the fields, a companion potentially suitable for tomography is detected in CO line emission within 25 arcsec of the QSO. We derive gas masses, dynamical masses, and far-infrared luminosities, and show that the QSOs in our sample have similar properties compared to less luminous QSOs and SMGs in the literature, despite the fact that their black hole masses (which are proportional to L
AGN ) are 1–2 orders of magnitude larger. We discuss two interpretations of these observations: this is due to selection effects, such as preferential face-on viewing angles and picking out objects in the tail ends of the scatter in host-galaxy mass and black hole mass relationships; or the black hole masses have been overestimated because the accretion rates are super-Eddington. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
50. VIS3COS.
- Author
-
Paulino-Afonso, Ana, Sobral, David, Darvish, Behnam, Ribeiro, Bruno, Stroe, Andra, Best, Philip, Afonso, José, and Matsuda, Yuichi
- Subjects
SUPERCLUSTERS ,UNIVERSE ,HIGH resolution spectroscopy ,GALAXIES ,STAR formation - Abstract
We present the VIMOS Spectroscopic Survey of a Supercluster in the COSMOS field (VIS
3 COS) at z ∼ 0.84. We use VIMOS high-resolution spectra (GG475 filter) to spectroscopically select 490 galaxies in and around the superstructure and an additional 481 galaxies in the line of sight. We present the redshift distribution, the catalogue to be made public, and the first results on the properties of individual galaxies and stacked spectra (3500 Å < λ < 4200 Å rest-frame). We probe a wide range of densities and environments (from low-density field to clusters and rich groups). We find a decrease in the median star formation rate from low- to high-density environments in all bins of stellar mass and a sharp rise of the quenched fraction (from ∼10% to ∼40 − 60%) of intermediate-stellar-mass galaxies (10 < log10 (M⋆ /M⊙ ) < 10.75) from filaments to clusters. The quenched fraction for massive galaxies shows little dependence on environment, being constant at ∼30 − 40%. We find a break in the strength of the [O II] emission, with nearly constant line equivalent widths at lower densities (∼ − 11 Å) and then a drop to ∼ − 2.5 Å towards higher densities. The break in the [OII] line strength happens at similar densities (log10 (1 + δ) ∼ 0.0 − 0.5) as the observed rise in the quenched fraction. Our results may provide further clues regarding the different environmental processes affecting galaxies with different stellar masses and highlight the advantages of a single dataset in the COSMOS field probing a wide range of stellar masses and environments. We hypothesise that quenching mechanisms are enhanced in high-density regions. [ABSTRACT FROM AUTHOR]- Published
- 2018
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.