479 research outputs found
Human vs. AI: Investigating Consumers’ Context-Dependent Purchase Intentions for Algorithm-Created Content
Increasingly digitalized media consumption is pressuring profitability in the content industry. Technological advancements in the realm of Artificial Intelligence (AI) render the potential to cut costs by applying algorithms to create content. Yet, before implementing algorithm-created content, content providers should be aware of the impact of algorithmic authorship on consumers’ intention to purchase said content. Accordingly, this study investigates user attitudes toward algorithmic content creation and their dependence on the underlying utilitarian or hedonic consumption context. In our online experiment (N=298), we find evidence for a positive effect of algorithmic authorship on consumers’ purchase intention. Even though the overall purchase intention is context dependent, this algorithm appreciation is independent of the content consumption context. Our study thus suggests that consumers appreciate algorithm-created content. Our results thus provide insights into the benefits of leveraging algorithms in order to maintain content providers’ profitability
A Giant Planet Around a Metal-poor Star of Extragalactic Origin
Stars in their late stage of evolution, such as Horizontal Branch stars, are
still largely unexplored for planets. We report the detection of a planetary
companion around HIP 13044, a very metal-poor star on the red Horizontal
Branch, based on radial velocity observations with a high-resolution
spectrograph at the 2.2-m MPG/ESO telescope. The star's periodic radial
velocity variation of P=16.2 days caused by the planet can be distinguished
from the periods of the stellar activity indicators. The minimum mass of the
planet is 1.25 Jupiter masses and its orbital semi-major axis 0.116 AU. Because
HIP 13044 belongs to a group of stars that have been accreted from a disrupted
satellite galaxy of the Milky Way, the planet most likely has an extragalactic
origin.Comment: 32 pages, 9 Figure
The visitor from an ancient galaxy: A planetary companion around an old, metal-poor red horizontal branch star
We report the detection of a planetary companion around HIP 13044, a
metal-poor red horizontal branch star belonging to a stellar halo stream that
results from the disruption of an ancient Milky Way satellite galaxy. The
detection is based on radial velocity observations with FEROS at the 2.2-m
MPG/ESO telescope. The periodic radial velocity variation of P=16.2 days can be
distinguished from the periods of the stellar activity indicators. We computed
a minimum planetary mass of 1.25 Jupiter masses and an orbital semimajor axis
of 0.116 AU for the planet. This discovery is unique in three aspects: First,
it is the first planet detection around a star with a metallicity much lower
than few percent of the solar value; second, the planet host star resides in a
stellar evolutionary stage that is still unexplored in the exoplanet surveys;
third, the planetary system HIP 13044 most likely has an extragalactic origin
in a disrupted former satellite of the Milky Way.Comment: 5 pages, 2 figures, 2 tables, submitted to the Proceedings of the
276th IAU Symposium "The Astrophysics of Planetary Systems
Fish, Marine n−3 Fatty Acids, and Atrial Fibrillation – Experimental Data and Clinical Effects
Marine n−3 polyunsaturated fatty acids (PUFA) may have beneficial effects in relation to atrial fibrillation (AF) with promising data from experimental animal studies, however, results from studies in humans have been inconsistent. This review evaluates the mechanisms of action of marine n−3 PUFA in relation to AF based on experimental data and provides a status on the evidence obtained from observational studies and interventional trials. In conclusion, there is growing evidence for an effect of marine n−3 PUFA in prevention and treatment of AF. However, further studies are needed to establish which patients are more likely to benefit from n−3 PUFA, the timing of treatment, and dosages
Regularized orbit models unveiling the stellar structure and dark matter halo of the Coma elliptical NGC 4807
This is the second in a series of papers dedicated to unveil the mass
structure and orbital content of a sample of flattened early-type galaxies in
the Coma cluster. The ability of our orbit libraries to reconstruct internal
stellar motions and the mass composition of a typical elliptical in the sample
is investigated by means of Monte-Carlo simulations of isotropic rotator
models. The simulations allow a determination of the optimal amount of
regularization needed in the orbit superpositions. It is shown that under
realistic observational conditions and with the appropriate regularization
internal velocity moments can be reconstructed to an accuracy of about 15 per
cent; the same accuracy can be achieved for the circular velocity and dark
matter fraction. In contrast, the flattening of the halo remains unconstrained.
Regularized orbit superpositions are applied to a first galaxy in our sample,
NGC 4807, for which stellar kinematical observations extend to 3 Reff. The
galaxy seems dark matter dominated outside 2 Reff. Logarithmic dark matter
potentials are consistent with the data, as well as NFW-profiles, mimicking
logarithmic potentials over the observationally sampled radial range. In both
cases, the derived stellar mass-to-light ratio agrees well with independently
obtained mass-to-light ratios from stellar population analysis. Kinematically,
NGC 4807 is characterized by mild radial anisotropy outside r>0.5 Reff,
becoming isotropic towards the center. Our orbit models hint at either a
distinct stellar component or weak triaxiality in the outer parts of the
galaxy.Comment: 20 pages, 25 figures, accepted for publication in MNRA
Galaxy-galaxy lensing studies from COMBO-17
We study the dark matter halos of galaxies with galaxy-galaxy lensing using
the COMBO-17 survey. This survey offers an unprecedented data set for studying
lens galaxies at z=0.2-0.7 including redshift information and spectral
classification from 17 optical filters for objects brighter than R=24. So far,
redshifts and classification for the lens galaxies have mainly been available
for local surveys like the Sloan Digital Sky Survey (SDSS). Further, redshifts
for the source galaxies have typically not been available at all but had to be
estimated from redshift probability distribution which -- for faint surveys --
even had to be extrapolated.
To study the dark matter halos we parametrize the lens galaxies as singular
isothermal spheres (SIS) or by Navarro-Frenk-White (NFW) profiles. In both
cases we find a dependence of the velocity dispersion or virial radius,
respectively, on lens luminosity and colour. For the SIS model, we are able to
reproduce the Tully-Fisher/Faber-Jackson relation on a scale of 150h^-1kpc. For
the NFW profile we also calculate virial masses, mass-to-light ratios and
rotation velocities.
Finally, we investigate differences between the three survey fields used
here.Comment: 6 pages, 5 figures. To be published in the proceedings of IAU
Symposium No. 225: The Impact of Gravitational Lensing on Cosmology, Y.
Mellier and G. Meylan, ed
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