Search Publications
An Upper Bound from Helioseismology on the Stochastic Background of Gravitational Waves
Roth, Markus; Siegel, Daniel M.
The universe is expected to be permeated by a stochastic background of gravitational radiation of astrophysical and cosmological origin. This background is capable of exciting oscillations in solar-like stars. Here we show that solar-like oscillators can be employed as giant hydrodynamical detectors for such a background in the µHz to mHz fr…
Spectral Analysis in Orbital/Superorbital Phase Space and Hints of Superorbital Variability in the Hard X-Rays of LS I +61°303
Torres, Diego F.; Li, Jian; Zhang, Shu
We present an INTEGRAL spectral analysis in the orbital/superorbital phase space of LS I +61°303. A hard X-ray spectrum with no cutoff is observed at all orbital/superorbital phases. The hard X-ray index is found to be uncorrelated with the radio index (non-simultaneously) measured at the same orbital and superorbital phases. In particular, the ab…
The evolution of star formation activity in galaxy groups
Finoguenov, A.; Berta, S.; Magnelli, B. +30 more
We study the evolution of the total star formation (SF) activity, total stellar mass (ΣM*) and halo occupation distribution (HOD) in massive haloes by using one of the largest X-ray selected sample of galaxy groups with secure spectroscopic identification in the major blank field surveys (ECDFS, CDFN, COSMOS, AEGIS). We provide an accur…
Maser and Infrared Studies of Oxygen-rich Late/Post-asymptotic Giant Branch Stars and Water Fountains: Development of a New Identification Method
Yung, Bosco H. K.; Nakashima, Jun-ichi; Henkel, Christian
We explored an efficient method to identify evolved stars with oxygen-rich envelopes in the late asymptotic giant branch (AGB) or post-AGB phase of stellar evolution, which include a rare class of objects—the "water fountains (WF)." Our method considers the OH and H2O maser spectra, the near-infrared Q-parameters (these are color indice…
Water emission from the high-mass star-forming region IRAS 17233-3606
Codella, C.; Csengeri, T.; Beuther, H. +7 more
We investigate the physical and chemical processes at work during the formation of a massive protostar based on the observation of water in an outflow from a very young object previously detected in H2 and SiO in the IRAS 17233-3606 region. We estimated the abundance of water to understand its chemistry, and to constrain the mass of the…
Volcanism on farside of the Moon: New evidence from Antoniadi in South Pole Aitken basin
Senthil Kumar, P.; Sruthi, U.
The lunar surface is characterized by asymmetric distribution of its volcanic deposits. The nearside contains about 90% of the mare basalts, while there are a few on the farside with some are in the South Pole Aitken (SPA) basin, which is the largest and oldest impact basin on the Moon. Although the mare volcanism on the nearside of the Moon has b…
Globular clusters: DNA of early-type galaxies?
Forte, Juan C.; Vega, E. Irene; Escudero, Carlos +4 more
This paper explores if the mean properties of early-type galaxies (ETGs) can be reconstructed from `genetic' information stored in their globular clusters (GCs; i.e. in their chemical abundances, spatial distributions and ages). This approach implies that the formation of each globular occurs in very massive stellar environments, as suggested by s…
Two-step forecast of geomagnetic storm using coronal mass ejection and solar wind condition
Kim, Y. -H.; Moon, Y. -J.; Gopalswamy, N. +2 more
To forecast geomagnetic storms, we had examined initially observed parameters of coronal mass ejections (CMEs) and introduced an empirical storm forecast model in a previous study. Now we suggest a two-step forecast considering not only CME parameters observed in the solar vicinity but also solar wind conditions near Earth to improve the forecast …
Minerals detection for hyperspectral images using adapted linear unmixing: LinMin
Schmidt, Frédéric; Legendre, Maxime; Le Mouëlic, Stéphane
Minerals detection over large volume of spectra is the challenge addressed by current hyperspectral imaging spectrometer in Planetary Science. Instruments such OMEGA (Mars Express), CRISM (Mars Reconnaissance Orbiter), M3 (Chandrayaan-1), VIRTIS (Rosetta) and many more, have been producing very large datasets since one decade. We propos…
Molecular absorption in transition region spectral lines
Peter, H.; Curdt, W.; Innes, D. +3 more
Aims: We present observations from the Interface Region Imaging Spectrograph (IRIS) of absorption features from a multitude of cool atomic and molecular lines within the profiles of Si IV transition region lines. Many of these spectral lines have not previously been detected in solar spectra.
Methods: We examined spectra taken from deep …