Search Publications
On the blind use of statistical tools in the analysis of globular cluster stars
D'Antona, Francesca; Tailo, Marco; Caloi, Vittoria
As with most data analysis methods, the Bayesian method must be handled with care. We show that its application to determine stellar evolution parameters within globular clusters can lead to paradoxical results if used without the necessary precautions. This is a cautionary tale on the use of statistical tools for big data analysis.
Adsorption of methane and CO2 onto olivine surfaces in Martian dust conditions
Martin-Torres, Javier; Escamilla-Roa, Elizabeth; Sainz-Díaz, C. Ignacio
Methane has been detected on all planets of our Solar System, and most of the larger moons, as well as in dwarf-planets like Pluto and Eric. The presence of this molecule in rocky planets is very interesting because its presence in the Earth's atmosphere is mainly related to biotic processes. Space instrumentation in orbiters around Mars has detec…
The Halo Masses of Galaxies to z ∼ 3: A Hybrid Observational and Theoretical Approach
Conselice, Christopher J.; Hartley, William; Twite, Jonathan W. +1 more
We use a hybrid observational/theoretical approach to study the relation between galaxy kinematics and the derived stellar and halo masses of galaxies up to z = 3 as a function of stellar mass, redshift, and morphology. Our observational sample consists of a concatenation of 1125 galaxies with kinematic measurements at 0.4 < z < 3 from long-…
A Transitional Disk around an Intermediate-mass Star in the Sparse Population of the Orion OB1 Association
Briceño, Cesar; Calvet, Nuria; Hernández, Jesús +8 more
We present a detailed study of the disk around the intermediate-mass star SO 411, aiming to explain the spectral energy distribution of this star. We show that this is a transitional disk truncated at ∼11 au, with ∼0.03 lunar masses of optically thin dust inside the cavity. Gas also flows through the cavity, since we find that the disk is still ac…
Decameter Type IV Burst Associated with a Behind-the-limb CME Observed on 7 November 2013
Rucker, H. O.; Panchenko, M.; Konovalenko, A. A. +5 more
We report on the results of observations of a type IV burst made by the Ukrainian Radio interferometer of the Academy of Sciences (URAN-2) in the frequency range 22 - 33 MHz. The burst is associated with a coronal mass ejection (CME) initiated by a behind-the-limb active region (N05E151) and was also observed by the Nançay Decameter Array (NDA) ra…
Speckle interferometry at the OAN-SPM México: astrometry of double stars measured in 2011
Borges Fernandes, M.; Guerrero, C. A.; Orlov, V. G. +1 more
We present speckle interferometric measurements of binary stars performed during 2011 February and April with the 1.5-m telescope and during 2011 July and November with the 2.1-m telescope of the Observatorio Astronómico Nacional, San Pedro Mártir, México, focusing on objects from the Washington Double Star Catalog with separations less than 1 arc…
Outliers: multicolour photometry guiding the search for evolved binary systems in the globular cluster 47 Tucanae
Kepler, S. O.; Montgomery, M. H.; Winget, D. E. +11 more
We use Hubble Space Telescope multicolour photometry of the globular cluster 47 Tucanae to uncover a population of 24 objects with no previous classification that are outliers from the single-star model tracks in the colour-magnitude diagram and yet are likely cluster members. By comparing those sources with evolutionary models and X-ray source ca…
Photoionization modelling of the giant broad-line region in NGC 3998
Devereux, Nick
Prior high angular resolution spectroscopic observations of the Low-ionization nuclear emission-line region (Liner) in NGC 3998 obtained with the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST) revealed a rich UV-visible spectrum consisting of broad permitted and broad forbidden emission lines. The photoionizati…
Gathering dust: A galaxy-wide study of dust emission from cloud complexes in NGC 300
Forbrich, J.; Riener, M.; Faesi, C. M. +1 more
Aims: We use multi-band observations by the Herschel Space Observatory to study the dust emission properties of the nearby spiral galaxy NGC 300. We compile a first catalogue of the population of giant dust clouds (GDCs) in NGC 300, including temperature and mass estimates, and give an estimate of the total dust mass of the galaxy.
Metho…
In-flight calibration of the Hitomi Soft X-ray Spectrometer. (2) Point spread function
Maeda, Yoshitomo; Ishida, Manabu; Tsujimoto, Masahiro +14 more
We present results of inflight calibration of the point spread function of the Soft X-ray Telescope that focuses X-rays onto the pixel array of the Soft X-ray Spectrometer system. We make a full array image of a point-like source by extracting a pulsed component of the Crab nebula emission. Within the limited statistics afforded by an exposure tim…