Search Publications
Distribution of the diffuse interstellar band λ6614 in the NGC 2264, Rosette Nebula, and S147 regions
Luo, A. -Li; Li, Yin-Bi; Wu, Hong +7 more
Diffuse interstellar bands (DIBs) are absorption features arising from the interstellar medium, for which the carriers remain unclear. In this work, a total of 3115 stars in the regions of NGC 2264, the Rosette Nebula, and S147 are selected from LAMOST-MRS to study the spatial and velocity distributions of the DIB λ6614 carrier. From the spatial d…
Long-term X-ray spectral variation of the Wolf-Rayet binary WR 102-1 in the Galactic bulge: evidence for wind distortion in the binary
Sugawara, Yasuharu; Ebisawa, Ken; Nagatsuka, Tomoki
WR 102-1 was detected by Suzaku as a conspicuous point source in the 6.7 keV intensity map of the central region of the Milky Way. The source was suggested as a possible Wolf-Rayet binary based on its X-ray and infrared spectral characteristics. The iron line emission is expected to originate in the Wolf-Rayet star's dynamic stellar wind when coll…
Spectral variability in NGC 1042 ULX1
Rana, Vikram; Ghosh, Tanuman
We report X-ray spectral variability in an ultraluminous X-ray source NGC 1042 ULX1, using archival XMM-Newton and recent NuSTAR observations. In long-term evolution, the source has shown a trend of variation in spectral hardness. The variability in different XMM-Newton observations is prominent above ~1 keV. Cool thermal disc component with a cha…
An investigation of the magnetic activity of HD 134319 based on TESS photometry and ground-based spectroscopy
Gu, Shenghong; Xu, Fukun; Ioannidis, Panogiotis
We present an analysis of the starspot properties and chromospheric activity on HD 134319 using high-precision photometry by Transiting Exoplanet Survey Satellite (TESS) in sectors 14-16 (T1) and 21-23 (T2) and high-resolution spectroscopy by the ELODIE spectrograph on 1.93-m telescope of Observatoire de Haute-Provence (OHP/ELODIE) and the High Re…
Stringent limits on 28SiO maser emission from the recurrent nova T Coronae Borealis
Munari, U.; Evans, A.; Pimpanuwat, B. +5 more
There are indications that the third-known eruption of the recurrent nova T CrB is imminent, and multiwavelength observations prior to the eruption are important to characterize the system before it erupts. T CrB is known to display the SiO fundamental vibrational feature at 8 $\, \mu$m. When the anticipated eruption occurs, it is possible that th…
The mass profile of NGC 3377 from a Bayesian approach
Caso, Juan P.
The mass profile for the moderately bright elliptical NGC 3377 is studied through a spherical Jeans analysis, combined with a Bayesian approach. The prior distributions are generated from dark matter simulations and observational constraints. The observational data set consist of Gemini/Gemini Multi-Object Spectrograph long-slit observations align…
BFS 10: a nascent bipolar H II region in a filamentary molecular cloud
Kerton, C. R.; Larose, Nicholas
We present a study of the compact blister H II region BFS 10 and its highly filamentary molecular cloud. We utilize 12CO observations from the Five College Radio Astronomy Observatory to determine the distance, size, mass, and velocity structure of the molecular cloud. Infrared observations obtained from the UKIRT Infrared Deep Sky Surv…
A new estimate of galaxy mass-to-light ratios from flexion lensing statistics
Fabritius, Joseph M.; Goldberg, David M.
We perform a flexion-based weak gravitational analysis of the first two Hubble Frontier Field clusters: Abell 2744 and MACS 0416. A parametric method for using radially projected flexion signals as a probe of cluster member mass is described in detail. The normalization and slope of a L - θE (as a proxy for L - σ) scaling relation in ea…
The kinematics and ionization structure of the extended emission-line region of QSO E1821+643
Robinson, A.; Seelig, T.; Rosborough, Sara A.
The most luminous quasars are created by major, gas-rich mergers and E1821+643, an optically luminous quasar situated at the centre of a cool-core cluster, appears to be in the late stages of the post-merger blowout phase. This quasar is also identified as a gravitational recoil candidate, in which the supermassive black hole (SMBH) has received a…
WHTZ 1: a high excitation Planetary Nebula not a gaseous cocoon from runaway star HD 185806
Parker, Quentin A.; Ritter, Andreas; Garde, Olivier +6 more
We present evidence that the nebular cocoon and bow-shock emission nebula putatively and recently reported as deriving from the 9th magnitude 'runaway' star HD 185806 is the previously discovered but obscure Planetary Nebula WHTZ 1 (Ra 7). It has a Gaia DR3 G~16 blue ionizing star at its geometric centre. We present imagery, spectroscopy, other da…