Search Publications
Isotopic Enrichment of Planetary Systems from Asymptotic Giant Branch Stars
Parker, Richard J.; Schoettler, Christina
Short-lived radioisotopes, in particular 26Al and 60Fe, are thought to contribute to the internal heating of the Earth, but are significantly more abundant in the solar system compared to the interstellar medium. The presence of their decay products in the oldest solar system objects argues for their inclusion in the Sun's pr…
The Unusual AGN Host NGC 1266: Evidence for Shocks in a Molecular Gas Rich S0 Galaxy with a Low Luminosity Nucleus
Wang, Junfeng; Zhao, Yinghe; Chen, Peibin
NGC 1266 is a lenticular galaxy (S0) hosting an active galactic nucleus (AGN), and known to contain a large amount of shocked gas. We compare the luminosity ratio of mid-J CO lines to IR continuum with star-forming galaxies (SFGs), and then model the CO spectral line energy distribution (SLED). We confirm that in the mid- and high-J regions (J
Investigating the Dominant Environmental Quenching Process in UVCANDELS/COSMOS Groups
Finkelstein, Steven L.; Arrabal Haro, Pablo; Dickinson, Mark +36 more
We explore how the fraction of quenched galaxies changes in groups of galaxies with respect to the distance to the center of the group, redshift, and stellar mass to determine the dominant process of environmental quenching in 0.2 < z < 0.8 groups. We use new UV data from the UVCANDELS project in addition to existing multiband photometry to …
Detailed α abundance trends in the inner Galactic bulge
Schultheis, M.; Ryde, N.; Rich, R. M. +7 more
Context. Until now, heavy interstellar extinction has meant that only a few studies of chemical abundances have been possible in the inner Galactic bulge. However, it is crucial to learn more about this structure in order to better understand the formation and evolution of the centre of the Galaxy and galaxies in general.
Aims: In this paper,…
Simultaneous millimetric and X-ray intraday variability in the radio-quiet AGN MCG+08-11-11
Bianchi, S.; Behar, E.; Petrucci, P. -O. +10 more
Most of the active galactic nuclei (AGN) are radio quiet (RQ) and, differently from radio-loud (RL) AGN, they do not show a signature of large-scale or powerful jets. The physical origin of their radio emission thus remains broadly unclear. The observation of flat and inverted radio spectra at gigahertz frequencies seems to support, however, the p…
26Al gamma rays from the Galaxy with INTEGRAL/SPI
Diehl, Roland; Greiner, Jochen; Siegert, Thomas +2 more
Context. The presence of radioactive 26Al at 1.8 MeV reveals an ongoing process of nucleosynthesis in the Milky Way. Diffuse emission from its decay can be measured with gamma-ray telescopes in space. The intensity, line shape, and spatial distribution of the 26Al emission allow for studies of these nucleosynthesis sources. T…
HARPS radial velocity search for planets in the Scorpius-Centaurus association. A combination with the HARPS and SOPHIE young nearby stars (YNS) surveys
Meunier, N.; Messina, S.; Kiefer, F. +13 more
Context. The Scorpius-Centaurus (Sco-Cen) young and nearby massive star-forming region is particularly well suited for extrasolar planet searches with both direct imaging and radial velocity (RV) techniques. The RV search, however, is challenging, as the stars are faster rotators on average than their older stellar counterparts of similar spectral…
Modelling of the processes of dunes formation on the surface of comet 67P/Churyumov-Gerasimenko
Wesołowski, Marcin
The paper discusses selected mechanisms that can significantly contribute to the formation of dune structures on the surface of comets. In these considerations, mechanisms related to the dynamics of dust on the surface of the nucleus were taken into account. In the first step, the maximum dimensions of particles that can be entrained into the come…
Complete X-ray census of M dwarfs in the solar neighborhood. I. GJ 745 AB: Coronal-hole stars in the 10 pc sample
Güdel, M.; Orlando, S.; Stelzer, B. +4 more
Context. X-ray emission is the most sensitive diagnostic of magnetic activity in M dwarfs and, hence, of the dynamo in low-mass stars. Moreover it is crucial for quantifying the influence of the stellar irradiation on the evolution of planet atmospheres.
Aims: We have embarked in a systematic study of the X-ray emission in a volume-limited sa…
Tracing the Galactic disk with planetary nebulae using Gaia DR3. Distance catalog, velocities, populations, and radial metallicity gradients of Galactic planetary nebulae
Bucciarelli, B.; Stanghellini, L.
Aims: We study the population of Galactic planetary nebulae (PNe) and their central stars (CSPNe) through the analysis of their distances and Galactic distribution. The PN distances are obtained by means of a revised statistical distance scale, based on an astrometrically-defined sample of their central stars from the third Gaia Data Release …