Search Publications
Molecular gas inflows and outflows in ultraluminous infrared galaxies at z ∼ 0.2 and one QSO at z = 6.1
Lutz, D.; Genzel, R.; Maiolino, R. +12 more
Aims: Our aim is to search for and characterize inflows and outflows of molecular gas in four ultraluminous infrared galaxies (ULIRGs; LIR > 1012L⊙) at z ∼ 0.2-0.3 and one distant quasi-stellar object (QSO) at z = 6.13.
Methods: We used Herschel/PACS and ALMA Band 7 observations of the hydroxyl molecul…
Spectroscopic characterization of the known O-star population in Cygnus OB2. Evidence of multiple star-forming bursts
Lennon, D. J.; Herrero, A.; Comerón, F. +6 more
Context. Cygnus OB2 provides a unique insight into the high-mass stellar content in one of the largest groups of young massive stars in our Galaxy. Although several studies of its massive population have been carried out over the last decades, an extensive spectroscopic study of the whole known O-star population in the association is still lacking…
A thin shell of ionized gas as the explanation for infrared excess among classical Cepheids
Kervella, P.; Domiciano de Souza, A.; Marengo, M. +12 more
Context. The infrared (IR) excess of classical Cepheids is seldom studied and poorly understood despite observational evidence and the potential for its contribution to induce systematics on the period-luminosity (PL) relation used in the calibration of the extragalactic distance scale.
Aims: This study aims to understand the physical origin …
Searching for molecular gas inflows and outflows in the nuclear regions of five Seyfert galaxies
Rigopoulou, D.; Domínguez-Fernández, A. J.; García-Burillo, S. +8 more
Active galactic nucleus (AGN) driven outflows are believed to play an important role in regulating the growth of galaxies, mostly via negative feedback. However, their effects on their hosts are far from clear, especially for low- and moderate-luminosity Seyferts. To investigate this issue, we obtained cold molecular gas observations, traced by th…
Rotation periods for cool stars in the open cluster Ruprecht 147 (NGC 6774). Implications for gyrochronology
Gruner, D.; Barnes, S. A.
Context. Gyrochronology allows the derivation of ages for cool main sequence stars based on their observed rotation periods and masses, or a suitable proxy thereof. It is increasingly well-explored for FGK stars, but requires further measurements for older ages and K - M-type stars.
Aims: We study the 2.7 Gyr-old open cluster Ruprecht 147 to …
J-PLUS: Unveiling the brightest end of the Lyα luminosity function at 2.0 < z < 3.3 over 1000 deg2
Hernández-Monteagudo, C.; Hernán-Caballero, A.; Varela, J. +22 more
We present the photometric determination of the bright end of the Lyα luminosity function (LF; at LLyα ≳ 1043.3 erg s-1) within four redshift windows (Δ z < 0.16) in the interval 2.2 ≲ z ≲ 3.3. Our work is based on the Javalambre Photometric Local Universe Survey (J-PLUS) first data release, which provides m…
Modeling the Lyα transit absorption of the hot Jupiter HD 189733b
Holmström, M.; Lammer, H.; Fossati, L. +7 more
Context. Hydrogen-dominated atmospheres of hot exoplanets expand and escape hydrodynamically due to the intense heating by the X-ray and extreme ultraviolet (XUV) irradiation of their host stars. Excess absorption of neutral hydrogen has been observed in the Lyα line during transits of several close-in gaseous exoplanets, indicating such extended …
Ca II H&K stellar activity parameter: a proxy for extreme ultraviolet stellar fluxes
France, K.; Fossati, L.; Sreejith, A. G. +2 more
Atmospheric escape is an important factor shaping the exoplanet population and hence drives our understanding of planet formation. Atmospheric escape from giant planets is driven primarily by the stellar X-ray and extreme ultraviolet (EUV) radiation. Furthermore, EUV and longer wavelength UV radiation power disequilibrium chemistry in the middle a…
Distances to the supernova remnants in the inner disk
Liu, Jifeng; Gao, Jian; Wang, Shu +5 more
Context. Distance measurements of supernova remnants (SNRs) are essential as accurate estimates of physical size, dust masses, and some other properties of SNRs depend critically on accurate distance measurements. However, the determination of SNR distances is still a tough task.
Aims: Red clump stars (RCs) have a long history of being used a…
The binary content of multiple populations in NGC 3201
Dreizler, S.; Bastian, N.; Latour, M. +7 more
We investigate the binary content of the two stellar populations that coexist in the globular cluster NGC 3201. Previous studies of binary stars in globular clusters have reported higher binary fractions in their first populations (P1, having field-like abundances) compared to their second populations (P2, having anomalous abundances). This is int…