Search Publications
Analysis of Gaia radial-velocity standards: stability and new substellar companion candidates
Gosset, E.; Damerdji, Y.; Morel, T. +4 more
Our main aim is to test the non-variability of the radial velocity (RV) of a sample of 2351 standard stars used for wavelength calibration of the Radial Velocity Spectrometer (RVS) instrument onboard Gaia. In this paper, we present the spectroscopic analysis of these stars with the determination of their physical parameters by matching observed an…
Ammonia in the interstellar medium of a starbursting disc at z = 2.6
Ivison, R. J.; Menten, K. M.; Dye, S. +4 more
We report the detection of the ground state rotational emission of ammonia, ortho-NH3 (JK = 10 → 00) in a gravitationally lensed intrinsically hyperluminous star-bursting galaxy at z = 2.6. The integrated line profile is consistent with other molecular and atomic emission lines which have resolved kinema…
Insight-HXMT measurements of the diffuse X-ray background
Zhang, J.; Cui, W.; Zhang, S. +8 more
We present an X-ray spectrum of the diffuse X-ray background (DXRB) between 1.5 and 120 keV, as measured with the Low-Energy Detector (LE) and the High-Energy Detector (HE) aboard the Insight-HXMT satellite, based on 'blank-sky' observations. LE covers a nominal energy range of 1-15 keV and HE 20-250 keV, but calibration issues and data quality na…
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 …