Search Publications
Robust Cross-correlation-based Measurement of Clump Sizes in Galaxies
Glazebrook, Karl; Obreschkow, Danail; Abraham, Roberto G. +4 more
Stars form in molecular complexes that are visible as giant clouds (∼ {10}5-6 {M}⊙ ) in nearby galaxies and as giant clumps (∼ {10}8-9 {M}⊙ ) in galaxies at redshifts z≈ 1-3. Theoretical inferences on the origin and evolution of these complexes often require robust measurements of their characteristic si…
High-resolution Near-infrared Observations of a Small Cluster Associated with a Bright-rimmed Cloud in W5
Kusune, Takayoshi; Watanabe, Makoto; Sugitani, Koji +4 more
We carried out near-infrared (IR) observations to examine star formation toward the bright-rimmed cloud SFO 12, of which the main exciting star is O7V star in W5-W. We found a small young stellar object (YSO) cluster of six members embedded in the head of SFO 12 facing its exciting star, aligned along the UV radiation incident direction from the e…
Dynamic Deuterium Enrichment in Cometary Water via Eley-Rideal Reactions
Yao, Yunxi; Giapis, Konstantinos P.
The deuterium-to-hydrogen ratio (D/H) in water found in the coma of Jupiter family comet (JFC) 67P/Churyumov-Gerasimenko was reported to be (5.3 ± 0.7) × 10-4, the highest among comets and three times the value for other JFCs with an ocean-like ratio. This discrepancy suggests the diverse origins of JFCs and clouds the issue of the orig…
Long-term Study of the Double Pulsar J0737-3039 with XMM-Newton: Spectral Analysis
Iacolina, M. N.; Pellizzoni, A.; Egron, E. +4 more
We present a long-term spectral monitoring of the unique double pulsar binary PSR J0737-3039 corresponding to two “Large Programs” performed by XMM-Newton in 2006 and 2011. Spectral variability of pulsar emission in soft X-rays is not evident over 5 years, despite the significant relativistic spin precession in the considered time span (∼ 25^\circ…
Excess Galactic Molecular Absorption Toward the Radio Galaxy 3C 111
Behar, E.; Reynolds, C. S.; Tombesi, F. +1 more
We show the combined spectral analysis of Chandra high-energy transmission grating and XMM-Newton reflection-grating spectrometer observations of the broad-line radio galaxy 3C 111. This source is known to show excess neutral absorption with respect to the one estimated from 21 cm radio surveys of atomic H I in the Galaxy. However, previous works …
Analysis of Quasi-periodic Oscillations and Time Lag in Ultraluminous X-Ray Sources with XMM-Newton
Zhang, Shu; Li, Zi-Jian; Xiao, Guang-Cheng +6 more
We investigated the power density spectrum (PDS) and time lag of ultraluminous X-ray sources (ULXs) observed by XMM-Newton. We determined the PDSs for each ULX and found that five of them show intrinsic variability due to obvious quasi-periodic oscillations (QPOs) of mHz-1 Hz, consistent with previous reports. We further investigated these five UL…
The Nature of Hard X-Ray (3-24 keV) Detected Luminous Infrared Galaxies in the COSMOS Field
Ueda, Yoshihiro; Matsuoka, Kenta
We investigate the nature of far-infrared (70 µm) and hard X-ray (3-24 keV) selected galaxies in the COSMOS field detected with both Spitzer and the Nuclear Spectroscopic Telescope Array (NuSTAR). By matching the Spitzer-COSMOS catalog with the NuSTAR-COSMOS catalog, we obtain a sample consisting of a hyperluminous infrared galaxy with {log}…
ALMA Maps of Dust and Warm Dense Gas Emission in the Starburst Galaxy IC 5179
van der Werf, Paul; Gao, Yu; Zhang, Zhi-Yu +6 more
We present our high-resolution (0.″15 × 0.″13, ∼34 pc) observations of the CO (6-5) line emission, which probes the warm and dense molecular gas, and the 434 µm dust continuum emission in the nuclear region of the starburst galaxy IC 5179, conducted with the Atacama Large Millimeter Array (ALMA). The CO (6-5) emission is spatially distribute…
The Hawaii SCUBA-2 Lensing Cluster Survey: Radio-detected Submillimeter Galaxies in the HST Frontier Fields
Smail, Ian; Heywood, Ian; Desai, Vandana +5 more
In this second paper of the Hawaii SCUBA-2 Lensing Cluster Survey series, we cross-match SCUBA-2 maps with 3 and 6 GHz images from the Janksy-VLA Frontier Fields Legacy Survey for three cluster fields, MACS J0416.1-2403, MACS J0717.5+3745, and MACS J1149.5+2223. Within the HST coverage, 14 out of 44 850 µm sources have 3 GHz counterparts, fi…
Neon-like Iron Ion Lines Measured in NIFS/Large Helical Device (LHD) and Hinode/EUV Imaging Spectrometer (EIS)
Hara, Hirohisa; Watanabe, Tetsuya; Murakami, Izumi +7 more
Line intensities emerging from the Ne-sequence iron ion (Fe XVII) are measured in the laboratory, by the Large Helical Device at the National Institute for Fusion Science, and in the solar corona by the EUV Imaging Spectrometer (EIS) on board the Hinode mission. The intensity ratios of Fe XVII λ 204.6/λ 254.8 are derived in the laboratory by unble…