Bibcode
Martínez-Paredes, M.; Aretxaga, I.; González-Martín, O.; Alonso-Herrero, A.; Levenson, N. A.; Ramos Almeida, C.; López-Rodríguez, E.
Referencia bibliográfica
The Astrophysical Journal, Volume 871, Issue 2, article id. 190, 9 pp. (2019).
Fecha de publicación:
2
2019
Revista
Número de citas
8
Número de citas referidas
8
Descripción
We examine star formation activity in a distant (z < 0.1) and
flux-limited sample of quasars (QSOs). Midinfrared (MIR) spectral
diagnostics at high spatial resolution (∼0.4 arcsec) yield star
formation rates (SFRs) in the inner regions (∼300 pc–1 kpc)
for 13 of 20 of the sample members. We group these objects according to
the size probed by the high angular resolution spectroscopy, with
characteristic scales of <0.7 and ∼0.7–1 kpc. Using the
polycyclic aromatic hydrocarbon (PAH) feature at 11.3 μm, we measure
SFRs around 0.2 and 1.6 M ⊙ yr‑1. We
also measure the larger aperture PAH-derived SFRs in the individual
IRS/Spitzer spectra of the sample and obtain a clear detection in
∼58% of them. We compare smaller and larger aperture measurements
and find that they are similar, suggesting that star formation activity
in these QSOs is more centrally concentrated, with the inner region
(≲1 kpc) accounting for the majority of star formation measured on
these scales, and that PAH molecules can be present in most local
MIR-bright QSOs within a few hundred parsecs from the central engine. By
comparison with merger simulations, we find that our estimation of the
SFR and black hole (BH) accretion rates are consistent with a scenario
in which the star formation activity is centrally peaked as predicted by
simulations.
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