Mahoshi Sawamura

ORCID: 0009-0003-5438-8303
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About
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Research Areas
  • Galaxies: Formation, Evolution, Phenomena
  • Astrophysics and Star Formation Studies
  • Stellar, planetary, and galactic studies
  • Astronomy and Astrophysical Research
  • Astrophysical Phenomena and Observations
  • Space Exploration and Technology
  • Atmospheric Ozone and Climate
  • Astro and Planetary Science
  • Photocathodes and Microchannel Plates
  • Gamma-ray bursts and supernovae

National Astronomical Observatory of Japan
2024

The University of Tokyo
2024

Abstract We present an analysis of near-infrared photometry 59 quasars at 5.83 < z 7.07, obtained with the Gemini North Telescope and Gran Telescopio CANARIAS. The sample consists low-luminosity discovered in Subaru High- Exploration Low-Luminosity Quasars (SHELLQs) project. With magnitudes combined optical photometric spectroscopic data from previous Hyper Suprime-Cam SHELLQs observations, we searched for red (dust-reddened) quasars, characterized by color excess E ( B − V ) > 0.1....

10.3847/1538-4357/ada27b article EN cc-by The Astrophysical Journal 2025-01-27

Abstract HSC 120505.09-000027.9 (J1205–0000) is one of the highest redshift ( z = 6.72) dust-reddened quasars (red quasars) known to date. We present an improved analysis Atacama Large Millimeter/submillimeter Array data [C ii ] 158 μ m line and underlying rest-frame far-infrared (FIR) continuum emission, previously reported in T. Izumi et al. (2021b), toward J1205–0000. Red are thought be a transitional phase from obscured starburst luminous blue quasar, some cases associated with massive...

10.3847/1538-4357/ada943 article EN cc-by The Astrophysical Journal 2025-02-07

Abstract We present Atacama Large Millimeter/submillimeter Array [C ii ] 158 μ m line and underlying far-IR continuum emission observations (0.″57 × 0.″46 resolution) toward a quasar–quasar pair system recently discovered at z = 6.05. The quasar nuclei (C1 C2) are faint ( M 1450 ≳ −23 mag), but we detect very bright bridging the 12 kpc between two objects extending beyond them (total luminosity L ≃ 6 10 9 ⊙ ). ]-based total star formation rate of is ∼550 yr −1 (the IR-based dust-obscured...

10.3847/1538-4357/ad57c6 article EN cc-by The Astrophysical Journal 2024-08-29

We present ALMA [CII] 158 $\mu$m line and underlying far-infrared continuum emission observations ($0''.57 \times 0''.46$ resolution) toward a quasar-quasar pair system recently discovered at $z = 6.05$ (Matsuoka et al. 2024). The quasar nuclei (C1 C2) are very faint ($M_{\rm 1450} \gtrsim -23$ mag), but we detect bright bridging the 12 kpc between two objects extending beyond them (total luminosity $L_{\rm [CII]} \simeq 6 10^9~L_\odot$). total star formation rate of is $\sim 100$ to 550...

10.48550/arxiv.2405.02468 preprint EN arXiv (Cornell University) 2024-05-03

view Abstract Citations (9) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Rocket observations of the Orion reflection nebulosity in range 130-200 nanometers and scattering properties dust grains far-ultraviolet. Onaka, T. ; Sawamura, M. Tanaka, W. Watanabe, Kodaira, K. Vacuum ultraviolet surface brightness maps southern part region at wavelengths 195.1, 179.6, 164.0, 148.4, 132.8 nm were obtained by a rocket experiment. Large-scale bright...

10.1086/162696 article EN The Astrophysical Journal 1984-12-01

view Abstract Citations (7) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Absolute photometry of the southern Orion region in vacuum ultraviolet (1300-2000 A). Tanaka, T. ; Onaka, Sawamura, M. Watanabe, Kodaira, K. Nishi, was carried out for five passbands A, Delta Lambda = 84 A) with a rocket-borne spectrometer. More than 60 early-type stars and diffuse background radiation were observed within raster-scanned field 8 x deg centered at alpha...

10.1086/161987 article EN The Astrophysical Journal 1984-05-01
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