Bibcode
Solanes, J. M.; Perea, J. D.; Valentí-Rojas, G.; del Olmo, A.; Márquez, I.; Ramos Almeida, C.; Tous, J. L.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 624, id.A86, 23 pp.
Fecha de publicación:
4
2019
Revista
Número de citas
12
Número de citas referidas
12
Descripción
A suite of 432 collisionless simulations of bound pairs of spiral
galaxies with mass ratios 1:1 and 3:1, and global properties consistent
with the ΛCDM paradigm, is used to test the conjecture that major
mergers fuel the dual AGN (DAGN) of the local volume. Our analysis was
based on the premise that the essential aspects of this scenario can be
captured by replacing the physics of the central black holes with
restrictions on their relative separation in phase space. We introduce
several estimates of the DAGN fraction and infer predictions for the
activity levels and resolution limits usually involved in surveys of
these systems, assessing their dependence on the parameters controlling
the length of both mergers and nuclear activity. Given a set of
constraints, we find that the values adopted for some of the latter
factors often condition the outcomes from individual experiments. Still,
the results do not, in general, reveal very tight correlations, the
clearest effect being the tendency of the frequencies normalized to the
merger time to anticorrelate with the orbital circularity. In agreement
with other theoretical studies, our simulations predict intrinsic DAGN
abundances that range from ˜ a few to 15% depending on the maximum
level of nuclear activity achieved, the higher the bolometric
luminosity, the lower the fraction. At the same time, we show that these
probabilities are reduced by about an order of magnitude when they are
filtered with the typical constraints applied by observational studies
of the DAGN fraction at low redshift. Seen as a whole, our results prove
that consideration of the most common limitations involved in the
detection of close active pairs at optical wavelengths is sufficient
alone to reconcile the intrinsic frequencies envisaged in a hierarchical
universe with the small fractions of double-peaked narrow-line systems
which are often reported at kpc-scales.
Proyectos relacionados
Actividad Nuclear en Galaxias: una Perspectiva 3D del Núcleo y su Entorno
Nuestro proyecto puede dividirse en dos líneas principales de investigación. En primer lugar, el estudio de los vientos producidos por cuásares luminosos oscurecidos y del impacto que estos tienen en sus galaxias anfitrionas (retroalimentación del AGN). Para ello hemos obtenido observaciones infrarrojas y ópticas con los instrumentos del Gran
Cristina
Ramos Almeida