Search Publications
Abundance of barium in the atmospheres of red giants in the Galactic globular cluster NGC 104 (47 Tuc)
Korotin, S.; Kučinskas, A.; Kolomiecas, E. +2 more
Context. While most (if not all) Type I Galactic globular clusters (GGCs) are characterised by spreads in the abundances of light chemical elements (e.g. Li, N, O, Na, Mg, Al), it is not yet well established whether similar spreads may exist in s-process elements as well.
Aims: We investigated the possible difference in Ba abundance between t…
Phobos image enhancement using unpaired multi-frame acquisitions from Indian Mars Color Camera
Manthira Moorthi, S.; Misra, Indranil; Rout, Litu +3 more
The Mars Color Camera (MCC) of Indian Space Research Organisation (ISRO) captures the elusive moon of Mars, Phobos. MCC instrument is the eye of Mars Orbiter Mission (MOM) launched by ISRO on 05th November 2013 from the spaceport of India, Sriharikota. MCC has already provided more than 1000 images of Martian surface features covering d…
Processing GOTO data with the Rubin Observatory LSST Science Pipelines I: Production of coadded frames
Ulaczyk, K.; Pallé, E.; Rol, E. +44 more
The past few decades have seen the burgeoning of wide-field, high-cadence surveys, the most formidable of which will be the Legacy Survey of Space and Time (LSST) to be conducted by the Vera C. Rubin Observatory. So new is the field of systematic time-domain survey astronomy; however, that major scientific insights will continue to be obtained usi…
Capturing dual AGN activity and kiloparsec-scale outflows in IRAS 20210+1121
Fiore, F.; Vignali, C.; Piconcelli, E. +8 more
The most standard scenario for the evolution of massive galaxies across cosmic time assumes a correspondence based on the interplay between active galactic nuclei (AGN) feedback, which injects large amounts of energy into the host environment, and galaxy mergers, with their ability to trigger massive star formation events and accretion onto superm…
A Complete 16 µm Selected Galaxy Sample at z ∼ 1: Mid-infrared Spectral Energy Distributions
Rigopoulou, D.; Cortzen, I.; Fazio, G. G. +21 more
We describe a complete, flux-density-limited sample of galaxies at redshift 0.8 < z < 1.3 selected at 16 µm. At the selection wavelength near 8 µm rest, the observed emission comes from both dust heated by intense star formation and active galactic nuclei (AGNs). Fitting the spectral energy distributions (SEDs) of the sample gala…
First star survivors as metal-rich halo stars that experienced supernova explosions in binary systems
Matsuno, Tadafumi; Saitoh, Takayuki R.; Suda, Takuma +2 more
The search for the first stars formed from metal-free gas in the universe is one of the key issues in astronomy because it relates to many fields, such as the formation of stars and galaxies, the evolution of the universe, and the origin of elements. It is not still clear if metal-free first stars can be found in the present universe. These first …
The episodic dust-making Wolf-Rayet star HD 38030 in the Large Magellanic Cloud
Massey, Philip; Boutsia, Konstantina; Williams, Peredur M. +1 more
Mid-infrared photometry of the Wolf-Rayet star HD 38030 in the Large Magellanic Cloud from the NEOWISE-R mission show it to have undergone a dust-formation episode in 2018 and the dust to have cooled in 2019-20. New spectroscopy with the MagE spectrograph on the Magellan I Baade Telescope in 2019 and 2020 show absorption lines attributable to a co…
Modeling of two CoRoT solar analogues constrained by seismic and spectroscopic analysis
Baudin, F.; Samadi, R.; Morel, T. +8 more
Solar analogues are important stars to study for understanding the properties of the Sun. Combined with seismic and spectroscopic analysis, evolutionary modelling becomes a powerful method to characterize stellar intrinsic parameters, such as mass, radius, metallicity and age. However, these characteristics, relevant for other aspects of astrophys…
Comptonization as an Origin of the Continuum in Intermediate Polars
Maiolino, T.; Titarchuk, L.; Wang, W. +2 more
In this paper we test if the ∼0.3-15 keV XMM-Newton EPIC pn spectral continuum of IPs can be described by the thermal Comptonization COMPTT model. We used publicly observations of 12 IPs (AE Aqr, EX Hya, V1025 Cen, V2731 Oph, RX J2133.7+5107, PQ Gem, NY Lup, V2400 Oph, IGR J00234+6141, IGR J17195-4100, V1223 Sgr, and XY Ari). We find that our mode…
Evolution of the Ultraviolet Upturn at 0.3 < z < 1: Exploring Helium-rich Stellar Populations
De Propris, Roberto; Ali, Sadman S.; Chung, Chul +2 more
We measure the near-UV (rest-frame ~2400 Å) to optical color for early-type galaxies in 12 clusters at 0.3 < z < 1.0. We show that this is a suitable proxy for the more common far-ultraviolet bandpass used to measure the ultraviolet upturn and find that the upturn is detected to z = 0.6 in these data, in agreement with previous work. We find…