Search Publications
CHIMPS2: 13CO J = 3→2 emission in the central molecular zone
Moore, T. J. T.; Rigby, A. J.; Longmore, S. N. +12 more
We present the initial data for the $(J = 3 \rightarrow 2)$ transition of $^{13}\text{CO}$ obtained from the central molecular zone (CMZ) of the Milky Way as part of the CO Heterodyne Inner Milky Way Plane Survey 2 (CHIMPS2). Covering $359^{\circ } \le l \le 1^{\circ }$ and $|b| \le 0.5^{\circ }$ with an angular resolution of 19 arcsec, velocity r…
VLBI with SKA: Possible Arrays and Astrometric Science
Xu, Ye; Liu, Dejian; Hao, Chaojie +4 more
The next generation of very long baseline interferometry (VLBI) is stepping into the era of microarcsecond (µas) astronomy, and pushing astronomy, especially astrometry, to new heights. VLBI with the Square Kilometre Array (SKA), SKA-VLBI, will increase current sensitivity by an order of magnitude, and reach astrometric precision routinely b…
Study of Nonlinear Evolution of Spacetime Fluctuations in Quantum Gravity Inflation for Deriving Primordial Spectrum
Hamada, Ken-ji
We study the evolution of quantum fluctuations of gravity around an inflationary solution in renormalizable quantum gravity, in which the initial scalar-fluctuation dominance is shown by the background-free nature expressed by a special conformal invariance. Inflation ignites at the Planck scale and continues until spacetime phase transition occur…
The Kinematic and Chemical Properties of the Close-in Planet Host Star 8 UMi
Wang, Wei; Huang, Yang; Beers, Timothy C. +11 more
A recent study by Hon et al. reported that a close-in planet around the red clump star, 8 UMi, should have been engulfed during the expansion phase of its parent star's evolution. They explained the survival of this exoplanet through a binary-merger channel for 8 UMi. The key to testing this formation scenario is to derive the true age of this sta…
Spectroscopic observations of selected planetary nebulae from the HASH data base
Temiz, Utkan; Aksaker, Nazım; Akyuz, Aysun
We conducted research on the classification and physical properties of 10 objects from the HASH [Hong Kong/Australian Astronomical Observatory/Strasbourg Observatory H-alpha Planetary Nebula (PN)] data base with small angular sizes (<8 arcsec) in the Northern hemisphere. The sample consisted of six Likely PNe, two new candidates, one emission-l…
The solar wind heavy ion composition in the ascending phases of the solar cycles 23 and 25
Livi, S.; Galvin, A. B.; Kistler, L. M. +5 more
The approximately 11-year solar cycle has been shown to impact the heavy ion composition of the solar wind, even when accounting for streams of differing speeds; however, the heavy ion composition observed between the same specific phases of a past solar cycle and the current cycle has rarely, if ever, been compared. Here, we compare the heavy ion…
Long-term monitoring of the Oe star VES 735: Ope! not so quiet after all
Kerton, C. R.; Marshall, Brandon
Only 3-4 per cent of Galactic O stars are observed to display the emission features representative of the OBe phenomenon, compared to Galactic B stars, which display these characteristics in 25-35 per cent of B0 and B1 stars. We present new observations of the high-mass O star, VES 735, which confirms its classification as one of these rare emissi…
The Calibration of Polycyclic Aromatic Hydrocarbon Dust Emission as a Star Formation Rate Indicator in the AKARI NEP Survey
Goto, Tomotsugu; Kim, Seong Jin; Burgarella, Denis +9 more
Polycyclic aromatic hydrocarbon (PAH) dust emission has been proposed as an effective extinction-independent star formation rate (SFR) indicator in the mid-infrared, but this may depend on conditions in the interstellar medium. The coverage of the AKARI/Infrared Camera (IRC) allows us to study the effects of metallicity, starburst intensity, and a…
Searching for orbital period modulation in X-ray observations of the symbiotic X-ray binary GX 1+4
Santangelo, Andrea; Ferrigno, Carlo; Bozzo, Enrico +3 more
The symbiotic X-ray binary GX 1+4 possesses a number of peculiar properties that have been studied since the early 1970s. In particular, the orbital period has been a point of debate for many years, until radial velocity measurements were able to settle the debate. These radial velocity findings have so far not been confirmed using X-ray data, eve…
Diamond-like carbon conversion surfaces for space applications
Wurz, Peter; Schwadron, Nathan A.; Fuselier, Stephen A. +14 more
We present diamond-like carbon (DLC) conversion surfaces to detect particles with energy below 2 keV. Conversion surfaces have been widely applied in measurements of low-energy particles by instruments onboard planetary and heliophysics missions. Their effectiveness is characterized by the efficiency in changing the charge state of the incident pa…