4,733 research outputs found
Outflows, Inflows and Young Stars in the inner 200 pc of the Seyfert galaxy NGC 2110
We present a two-dimensional mapping of stellar population age components,
emission-line fluxes, gas excitation and kinematics within the inner
pc of the Seyfert 2 galaxy NGC 2110. We used the Gemini North Integral Field
Spectrograph (NIFS) in the J and K bands at a spatial resolution of
pc. The unresolved nuclear continuum is originated in combined contributions of
young stellar population (SP; age Myr), a featureless AGN continuum
and hot dust emission. The young-intermediate SP (age Myr) is
distributed in a ring-shaped structure at pc from the nucleus,
which is roughly coincident with the lowest values of the stellar velocity
dispersion. In the inner pc the old SP (age Gyr) is dominant.
The [FeII]1.25m emission-line flux distribution is correlated with the
radio emission and its kinematics comprise two components, one from gas
rotating in the galaxy plane and another from gas in outflow within a bicone
oriented along north-south. These outflows seem to originate in the interaction
of the radio jet with the ambient gas producing shocks that are the main
excitation mechanism of the [FeII] emission. We estimate: (1) an ionized gas
mass outflow rate of M/yr at 70 pc from the nucleus;
and (2) a kinetic power for the outflow of only 0.05% of the AGN bolometric
luminosity implying weak feedback effect on the galaxy.Comment: Accepted for publication in MNRA
Induced mass in N=2 super Yang-Mills theories
The masses of the matter fields of N=2 Super-Yang-Mills theories can be
defined as parameters of deformed supersymmetry transformations. The
formulation used involves central charges for the matter fields. The explicit
form of the deformed supersymmetry transformations and of the invariant
Lagrangian in presence of the gauge supermultiplet are constructed. This works
generalizes a former one, due to the same authors, which presented the free
matter case.Comment: 15 pages, Late
Disentangling the near infrared continuum spectral components of the inner 500 pc of Mrk 573: two-dimensional maps
We present a near infrared study of the spectral components of the continuum
in the inner 500500 pc of the nearby Seyfert galaxy Mrk573 using
adaptive optics near-infrared integral field spectroscopy with the instrument
NIFS of the Gemini North Telescope at a spatial resolution of 50 pc. We
performed spectral synthesis using the {\sc starlight} code and constructed
maps for the contributions of different age components of the stellar
population: young ( Myr), young-intermediate (
Myr), intermediate-old ( Myr Gyr) to the
near-IR K-band continuum, as well as their contribution to the total stellar
mass. We found that the old stellar population is dominant within the inner 250
pc, while the intermediate age components dominate the continuum at larger
distances. A young stellar component contributes up to 20% within the
inner 70 pc, while hot dust emission and featureless continuum components
are also necessary to fit the nuclear spectrum, contributing up to 20% of the
K-band flux there. The radial distribution of the different age components in
the inner kiloparsec of Mrk573 is similar to those obtained by our group for
the Seyfert galaxies Mrk1066, Mrk1157 and NGC1068 in previous works using a
similar methodology. Young stellar populations (100 Myr) are seen in the
inner 200-300 pc for all galaxies contributing with 20% of the K-band
flux, while the near-IR continuum is dominated by the contribution of
intermediate-age stars (100 Myr-2 Gyr) at larger distances. Older stellar
populations dominate in the inner 250 pc
Specifying Adaptations through a DSL with an Application to Mobile Robot Navigation
Developing applications for resource-constrained embedded systems is a challenging task specially when applications must adapt to changes in their operating conditions or environment. To ensure an appropriate response at all times, it is highly desirable to develop applications that can dynamically adapt their behavior at run-time. In this paper we introduce an architecture that allows the specification of adaptable behavior through an external, high-level and platform-independent domain-specific language (DSL). The DSL is used here to define adaptation rules that change the run-time behavior of the application depending on various operational factors, such as time constraints. We illustrate the use of the DSL in an application to mobile robot navigation using smartphones, where experimental results highlight the benefits of specifying the adaptable behavior in a flexible and external way to the main application logic
Depicting #fatherhood involvement on Instagram: Caregiving, affection, and stimulation
This article aims to analyze how fatherhood is performed on Instagram by examining the domains of involvement. Parental roles and behaviors have changed in the last years and are currently a relevant social and scientific topic. The way that fatherhood is performed is also a frequent subject on social media, spreading the ideal of a new fatherhood and portraying the father as committed to childcare duties. The hashtag âfatherhoodâ was used to identify posts on Instagram representing father involvement. A final sample of 121 posts was identified. Results depicted three main domains in fatherhoodâs online representations of involvement: (1) child caregiving; (2) fathers as a source of the childâs affection; and (3) fathers involved in play, committed to the childâs interests and offering new opportunities of stimulation. The display of fatherhood as a role requiring dedication and effort also emerged, but to a lesser extent. Nevertheless, only positive emotions were shared, depicting pleasure in the performed role, and communicating an ideal and self-enhancing profile. Moreover, posts seemed to disseminate an ideal of fatherhood rather than raise questions or discuss the challenges related to it. Findings uncover how media social representations of fatherhood are still an unfinished process, failing to capture diversity and challenges in contemporary families
Ecological aspects of lepidopteran caterpillar parasitoids from Caryocar brasiliense Camb. (Caryocaraceae) in a cerrado sensu stricto of Central Brazil.
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