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http://hdl.handle.net/20.500.12386/25013
Titolo: | First identification of direct collapse black hole candidates in the early Universe in CANDELS/GOODS-S | Autori: | Pacucci, Fabio Ferrara, Andrea GRAZIAN, Andrea FIORE, Fabrizio GIALLONGO, Emanuele Puccetti, Simonetta |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 459 | Fascicolo: | 2 | Da pagina:: | 1432 | Abstract: | The first black hole seeds, formed when the Universe was younger than ∼500 Myr, are recognized to play an important role for the growth of early (z ∼ 7) supermassive black holes. While progresses have been made in understanding their formation and growth, their observational signatures remain largely unexplored. As a result, no detection of such sources has been confirmed so far. Supported by numerical simulations, we present a novel photometric method to identify black hole seed candidates in deep multiwavelength surveys. We predict that these highly obscured sources are characterized by a steep spectrum in the infrared (1.6-4.5 μm), I.e. by very red colours. The method selects the only two objects with a robust X-ray detection found in the CANDELS/GOODS-S survey with a photometric redshift z ≳ 6. Fitting their infrared spectra only with a stellar component would require unrealistic star formation rates (≳2000 M<SUB>☉</SUB> yr<SUP>-1</SUP>). To date, the selected objects represent the most promising black hole seed candidates, possibly formed via the direct collapse black hole scenario, with predicted mass >10<SUP>5</SUP> M<SUB>☉</SUB>. While this result is based on the best photometric observations of high-z sources available to date, additional progress is expected from spectroscopic and deeper X-ray data. Upcoming observatories, like the JWST, will greatly expand the scope of this work. | URI: | http://hdl.handle.net/20.500.12386/25013 | URL: | https://academic.oup.com/mnras/article/459/2/1432/2595108 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw725 | Bibcode ADS: | 2016MNRAS.459.1432P | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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