1998A&A...329..399C


Query : 1998A&A...329..399C

1998A&A...329..399C - Astronomy and Astrophysics, volume 329, 399-408 (1998/1-2)

Dust in high-z radio-loud AGN.

CIMATTI A., FREUDLING W., ROETTGERING H.J.A., IVISON R.J. and MAZZEI P.

Abstract (from CDS):

We present continuum observations of a small sample of high-redshift, radio-loud AGN (radio galaxies and quasars) aimed at the detection of thermal emission from dust. Seven AGN were observed with IRAM and SEST at 1.25mm; two of them, the radio galaxies 1243+036 (z∼3.6) and MG 1019+0535 (z∼2.8) were also observed at 0.8mm with the JCMT submillimetre telescope. Additional VLA observations were obtained in order to derive the spectral shape of the synchrotron radiation of MG 1019+0535 at high radio frequencies. MG 1019+0535 and TX 0211-122 were expected to contain a large amount of dust based on their depleted Lyα emission. The observations suggest a clear 1.25-mm flux density excess over the synchrotron radiation spectrum of MG 1019+0535, suggesting the presence of thermal emission from dust in this radio galaxy, whereas the observations of TX 0211-122 were not sensitive enough to meaningfully constrain its dust content. On the other hand, our observations of 1243+036 provide a stringent upper limit on the total dust mass of <108M. Finally, we find that the spectra of the radio-loud quasars in our sample (2<z<4.5) steepen between rest-frame radio and the far-infrared. We discuss the main implications of our results, concentrating on the dusty radio galaxy, MG 1019+0535.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: ISM - radio continuum: galaxies - quasars: general - galaxies: individual: G 1243+036 (PKS 1243+036), MG 1019+0535 (MITG J1019+0535)

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 PMN J0214-1158 rG 02 14 17.4 -11 58 47           ~ 58 1
2 RAFGL 618 pA* 04 42 53.6242032600 +36 06 53.400902220   16.32   12.59   C-rich 981 0
3 NAME NGC 2071 IR SFR 05 47 04.4 +00 21 49           ~ 66 0
4 NVSS J090530+340756 rG 09 05 30.1 +34 07 57   24.0 23.800 23.500   ~ 154 1
5 PMN J0945-2429 rG 09 45 32.7 -24 28 49           ~ 93 1
6 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2240 0
7 4C 05.41 rG 10 19 33.4 +05 34 35   20.0       ~ 44 1
8 [VV96] J102434.5+470911 Sy1 10 24 34.5 +47 09 11     20.5     ~ 477 0
9 [VV98] J104609.1-292036 QSO 10 45 40.6258416480 -29 27 26.335017288     19.40     ~ 41 1
10 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5559 1
11 4C 03.24 rG 12 45 38.4 +03 23 18           ~ 72 1
12 QSO B1251-407 QSO 12 53 59.5319362272 -40 59 30.719565312   23.7 19.9 19.9   ~ 46 1
13 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4065 2
14 4C 63.20 rG 14 36 37.4 +63 19 13         23.6 ~ 78 1
15 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1158 1

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2022.05.29-04:34:38

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