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Abstract:

During the last decades, much effort has been devoted to explain the discrepancy between the amount of intracluster medium (ICM) estimated from stellar evolution theories and that emerging from observations in globular clusters (GCs). One possible scenario is the accretion of this medium by an intermediate-mass black hole (IMBH) at the centre of the cluster. In this work, we aim at modelling the cluster colour-excess profile as a tracer of the ICM density, both with and without an IMBH. Comparing the profiles with observations allows us to test the existence of IMBHs and their possible role in the cleansing of the ICM. We derive the intracluster density profiles from hydrodynamical models of accretion on to a central IMBH in a GC and we determine the corresponding dust density. This model is applied to a list of 25 Galactic GCs. We find that central IMBHs decrease the ICM by several orders of magnitude. In a subset of nine clusters, the absence of the black hole combined with a low-ICM temperature would be at odds with present gas mass content estimations. As a result, we conclude that IMBHs are an effective cleansing mechanism of the ICM of GCs. We construct synthetic extinction maps for M 62 and ωCen, two clusters in the small subset of nine with observed 2D extinction maps. We find that under reasonable assumptions regarding the model parameters, if the gas temperature in M 62 is close to 8000 K, an IMBH needs to be invoked. Further ICM observations regarding both the gas and dust in GCs could help to settle this issue. © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Registro:

Documento: Artículo
Título:Synthetic extinction maps around intermediate-mass black holes in Galactic globular clusters
Autor:Pepe, C.; Pellizza, L.J.
Filiación:Instituto de Astronomía y Física del Espacio, Av. Int. Guiraldes s/n, Ciudad Autónoma de Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, Ciudad Autónoma de Buenos Aires, Argentina
Instituto Argentino de Radioastronomía, Camino Gral. Belgrano Km 40, Villa Elisa, Buenos Aires, Argentina
Palabras clave:Dust, extinction; Globular clusters: general; ISM: general; Radiative transfer; Stars: black holes
Año:2016
Volumen:460
Número:3
Página de inicio:2542
Página de fin:2551
DOI: http://dx.doi.org/10.1093/mnras/stw1095
Título revista:Monthly Notices of the Royal Astronomical Society
Título revista abreviado:Mon. Not. R. Astron. Soc.
ISSN:00358711
CODEN:MNRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v460_n3_p2542_Pepe

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Citas:

---------- APA ----------
Pepe, C. & Pellizza, L.J. (2016) . Synthetic extinction maps around intermediate-mass black holes in Galactic globular clusters. Monthly Notices of the Royal Astronomical Society, 460(3), 2542-2551.
http://dx.doi.org/10.1093/mnras/stw1095
---------- CHICAGO ----------
Pepe, C., Pellizza, L.J. "Synthetic extinction maps around intermediate-mass black holes in Galactic globular clusters" . Monthly Notices of the Royal Astronomical Society 460, no. 3 (2016) : 2542-2551.
http://dx.doi.org/10.1093/mnras/stw1095
---------- MLA ----------
Pepe, C., Pellizza, L.J. "Synthetic extinction maps around intermediate-mass black holes in Galactic globular clusters" . Monthly Notices of the Royal Astronomical Society, vol. 460, no. 3, 2016, pp. 2542-2551.
http://dx.doi.org/10.1093/mnras/stw1095
---------- VANCOUVER ----------
Pepe, C., Pellizza, L.J. Synthetic extinction maps around intermediate-mass black holes in Galactic globular clusters. Mon. Not. R. Astron. Soc. 2016;460(3):2542-2551.
http://dx.doi.org/10.1093/mnras/stw1095