Search Publications
Erratum: Primordial black hole origin for thermal gamma-ray bursts
del Barco, Oscar
A 2+1 + 1 quadruple star system containing the most eccentric, low-mass, short-period, eclipsing binary known
Vanderburg, A.; Zasche, P.; Borkovits, T. +12 more
We present an analysis of a newly discovered 2+1 + 1 quadruple system with TESS containing an unresolved eclipsing binary (EB) as part of TIC 121088960 and a close neighbour TIC 121088959. The EB consists of two very low-mass M dwarfs in a highly eccentric (e = 0.709) short-period (P = 3.043 58 d) orbit. Given the large pixel size of TESS and the …
The spiral density-wave structure of the Milky Way in the 3-kpc-scale solar neighbourhood: line-of-sight velocities of 252 young open clusters
Gedalin, Michael; Jiang, Ing-Guey; Griv, Evgeny
Following Lin and Shu, the spiral structure in the Milky Way disc is considered as an oscillating density-wave pattern. As such, regular enhancements in density are relatedly linked to systematic variations in velocity of young stars and stellar clusters, and interstellar gas. We explain measured line-of-sight velocities of 252 open clusters with …
Search for carbon-bearing compounds on low-albedo asteroids
Barucci, M. A.; Fornasier, S.; Matsuoka, M. +5 more
In this work, we aim to investigate the presence of absorption bands around 3.4 µm in the infrared spectra of primitive asteroids. We collected the published reflectance spectra of low-albedo asteroids from the literature and analysed the 2.4-3.8 µm region using the same techniques. From the initial data set of 92 asteroids, we restric…
On the stability of tangential discontinuity in the interaction of solar wind and cometary atmospheres
Baranov, V. B.; Alexashov, D. B.; Ruderman, M. S.
In 2004, European Space Agency launched the spacecraft Rosetta. After almost 10-yr flight it arrived at the Churyumova-Gerasimenko comet. Rosetta was orbiting about the comet for some time observing its environment. One of the most interesting observations obtained during this mission was multiple disappearance of magnetic field. It was suggested …
Radial velocities from far-red spectra of Carina Arm O and early B stars
Drew, J. E.; Blake-Parsons, F.; Mohr-Smith, M.
Massive O and early B stars are important markers of recent star formation and exert a significant influence on their environments during their short lives via photoionization and winds and when they explode as supernovae. In the Milky Way, they can be detected at great distances but often lie behind large dust columns, making detection at short w…
Investigating star-formation activity towards the southern H II region RCW 42
Ojha, D. K.; Vig, S.; Ghosh, S. K. +4 more
The star-forming activity in the H II region RCW 42 is investigated using multiple wavebands, from near-infrared to radio wavelengths. Located at a distance of 5.8 kpc, this southern region has a bolometric luminosity of 1.8 × 106 L⊙. The ionized gas emission has been imaged at low radio frequencies of 610 and 1280 MHz using …
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…