English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/46721
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Spectral energy distribution of hyperluminous infrared galaxies

AuthorsRuiz, Ángel; Miniutti, Giovanni ; Panessa, Francesca ; Carrera, Francisco J.
KeywordsGalaxies: active
Galaxies: starburst
Galaxies: evolution
X-rays: galaxies
Infrared: galaxies
Issue DateJun-2010
PublisherEDP Sciences
CitationAstronomy and Astrophysics 515: A99 (2010)
Abstract[Aims]: The relationship between star formation and super-massive black hole growth is central to our understanding of galaxy formation and evolution. Hyperluminous infrared galaxies (HLIRG) are unique laboratories to investigate the connection between starburst (SB) and active galactic nuclei (AGN), because they exhibit extreme star-formation rates, and most of them show evidence of harbouring powerful AGN. [Methods]: Our previous X-ray study of a sample of HLIRG shows that the X-ray emission of most of these sources is dominated by AGN activity. To improve our estimate of the relative contribution of the AGN and SB emission to its total bolometric output, we have built multi-wavelength (from radio to X-rays) spectral energy distributions (SED) for these HLIRG and fitted standard empirical AGN and SB templates to these SED. [Results]: In broad terms, most sources are well fitted with this method, and we found AGN and SB contributions similar to those obtained by previous studies of HLIRG. We have classified the HLIRG SED into two groups, class A and class B. Class A HLIRG show a flat SED from the optical to the infrared energy range. Three out of seven class A sources can be modelled with a pure luminosity-dependent quasar template, while the rest of them require a type 1 AGN template and a SB template. The SB component is dominant in three out of four class A objects. Class B HLIRG show SED with a prominent and broad IR bump. These sources cannot easily be modelled with a combination of pure AGN and pure SB, they require templates of composite objects, suggesting that of their emission comes from stellar formation processes. [Conclusions]: We propose that our sample is actually composed of three different populations: very luminous quasars (class A objects with negligible SB contribution), young galaxies going through their maximal star-formation period (class A objects with significant SB emission) and the high luminosity tail of the ultraluminous infrared galaxies population distribution (class B sources).
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361/200912235
Appears in Collections:(CAB) Artículos
(IFCA) Artículos
Files in This Item:
File Description SizeFormat 
Spectral energy distribution.pdf620,56 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.