2007A&A...467L...7D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST09:21:55

2007A&A...467L...7D - Astronomy and Astrophysics, volume 467, L7-10 (2007/5-3)

Quasar 3C298: a test-case for meteoritic nanodiamond 3.5 µm emission.

DE DIEGO J.A., BINETTE L., OGLE P., ANDERSEN A.C., HARO-CORZO S. and WOLD M.

Abstract (from CDS):

We calculate the dust emission expected at 3.43 and 3.53µm if meteoritic (i.e. hydrogenated) nanodiamonds are responsible for most of the far-UV break observed in quasars. 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. Using as test case a spectrum of 3C298 provided by the Spitzer Observatory, we do not find evidence of these emission bands. 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.

Abstract Copyright:

Journal keyword(s): galaxies: active - ISM: dust, extinction - infrared: galaxies - ultraviolet: galaxies - quasars: individual: 3C298

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 97408 * 11 12 35.1732957654 -04 04 36.660271791   10.08 9.10     G8III 4 0
2 3C 298.0 QSO 14 19 08.1804677481 +06 28 34.803573057   17.12 16.79     ~ 368 1

    Equat.    Gal    SGal    Ecl

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2020.07.05-09:21:55

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