Search Publications
A Jet Source of Event Horizon Telescope Correlated Flux in M87
Punsly, Brian
Event Horizon Telescope (EHT) observations at 230 GHz are combined with Very Long Baseline Interferometry (VLBI) observations at 86 GHz and high-resolution Hubble Space Telescope optical observations in order to constrain the broadband spectrum of the emission from the base of the jet in M87. The recent VLBI observations of Hada et al. provide muc…
Massive Star Formation in the LMC. I. N159 and N160 Complexes
Gehrz, Robert D.; Jones, Terry J.; Gordon, Michael S. +1 more
We present images and spectral energy distributions (SEDs) of massive young stellar objects (YSOs) in three star-forming H II regions of the Large Magellanic Cloud: N159A, N159 Papillon, and N160. We use photometry from SOFIA/FORCAST at 25.3-37.1 µm to constrain model fits to the SEDs and determine luminosities, ages, and dust content of the…
Timing Analysis of V404 Cyg during Its Brightest Outburst with INTEGRAL/SPI
Jourdain, E.; Roques, J. P.; Rodi, J.
The outburst of V404 Cyg during the summer of 2015 reached unparalleled intensities at X-ray and soft gamma-ray energies with fluxes > 50 Crab in the 20-50 keV energy band. To date, studies in the hard X-ray/soft gamma-ray energy domain have focused primarily on the energy spectra. In this work, a timing analysis has been performed with INTEGRA…
X-Ray Temperatures, Luminosities, and Masses from XMM-Newton Follow-upof the First Shear-selected Galaxy Cluster Sample
Hughes, John P.; Wittman, David; Deshpande, Amruta J.
We continue the study of the first sample of shear-selected clusters from the initial 8.6 square degrees of the Deep Lens Survey (DLS); a sample with well-defined selection criteria corresponding to the highest ranked shear peaks in the survey area. We aim to characterize the weak lensing selection by examining the sample’s X-ray properties. There…
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…