NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T22:56:50 PDT
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For refcode 2007A&A...467L...7D:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2007A&A...467L...7D Quasar 3C 298: a test-case for meteoritic nanodiamond 3.5 micron emission de Diego, J. A.; Binette, L.; Ogle, P.; Andersen, A. C.; Haro-Corzo, S.; Wold, M. Abstract. Aims.We calculate the dust emission expected at 3.43 and 3.53 micron if meteoritic (i.e. hydrogenated) nanodiamonds are responsible for most of the far-UV break observed in quasars. Methods: We integrate the UV flux that hydrogenated nanodiamonds must absorb to reproduce the far-UV break. Based on laboratory spectra of H-terminated diamond surfaces, we analyse the radiative energy budget and derive theoretically the IR emission profiles expected for possible C-H surface stretch modes of the diamonds. Results: Using as test case a spectrum of 3C 298 provided by the Spitzer Observatory, we do not find evidence of these emission bands. Conclusions: While diamonds without surface adsorbates remain a viable candidate for explaining the far-UV break observed in quasars, hydrogenated nanodiamonds appear to be ruled out, as they would give rise to IR emission bands, which have not been observed so far. Key words: galaxies: active, ISM: dust, extinction, infrared: galaxies, ultraviolet: galaxies, quasars: individual: 3C 298
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