Query : 2002A&A...384L..11B

2002A&A...384L..11B - Astronomy and Astrophysics, volume 384, L11-14 (2002/3-3)

Dust emission and star formation toward a redshift 5.5 QSO.


Abstract (from CDS):

We report observations of the low-luminosity z=5.50 quasar RD J030117+002025 (RD0301 hereafter) at 250GHz (1.20mm) using the Max-Planck Millimeter Bolometer (MAMBO) array at the IRAM 30-meter telescope. The quasar was detected with a 1.2mm flux density of 0.87±0.20mJy. The lack of detectable 1.4GHz radio emission indicates that the millimeter emission is of thermal nature, making RD0301 the most distant dust-emission source known. When matching a 50K grey body thermal far-infrared (FIR) spectrum to the observed millimeter flux we imply a FIR luminosity ≃4x1012L, which is comparable to the quasar's optical luminosity. If the FIR luminosity arises from massive star formation, the implied star formation rate would be ∼600M/yr, comparable to that of the starburst galaxies which dominate the average star formation and FIR emission in the early Universe. The FIR luminosity of RD0301 is close to the average of that found in optically far more luminous high-redshift quasars. The comparably high millimeter to optical brightness ratio of RD0301 is further evidence for that there is no strong correlation between the optical and millimeter brightness of high-redshift quasars, supporting the idea that in high-redshift quasars the dust is not heated by the AGN, but by starbursts.

Abstract Copyright:

Journal keyword(s): galaxies: formation - galaxies: starburst - galaxies: high-redshift - galaxies: quasars: individual: RD J030117+002025 - quasars: dust emission - millimeter

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 [VV2000] J030117.1+002026 QSO 03 01 17.00998 +00 20 26.0000     23.80     ~ 22 0
2 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1956 3
3 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2918 4

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