2003A&A...411..343K


Query : 2003A&A...411..343K

2003A&A...411..343K - Astronomy and Astrophysics, volume 411, 343-350 (2003/12-1)

A submillimetre selected quasar in the field of Abell 478.

KNUDSEN K.K., VAN DER WERF P.P. and JAFFE W.

Abstract (from CDS):

We present the discovery of a dusty quasar, SMM J04135+10277, located behind the galaxy cluster Abell 478. The quasar was discovered as the brightest source in a submillimetre survey of high redshift galaxies lensed by foreground rich clusters of galaxies in a project aimed at studying the cosmic star formation history of dusty galaxies. With submillimetre fluxes of S850=25±2.8mJy and S450=55±17mJy this object is one of the brightest submillimetre sources known. Optical imaging revealed a point source with I=19.4±0.1mag (corrected for galactic extinction). Follow-up optical spectroscopy showed this object to be a quasar at redshift z=2.837±0.003. The quasar was also detected at shorter infrared wavelengths with the Infrared Space Observatory. This object is the first quasar discovered by its submillimetre emission. Given the general lack of overlap between deep submillimetre and X-ray samples, usually interpreted as a low incidence of active nuclei in submillimetre samples, this is an unusual object. Analysis of number counts of quasars and of submillimetre galaxies bears out this suggestion. We compare the properties of SMM J04135+10277 to those of optically selected quasars with submillimetre emission, and argue that the optical faintness results from a large viewing angle with the direction of relativistic beaming, and not from abnormally high extinction. We also find indications that the bulk of the submillimetre flux density is not powered by the quasar nucleus. This conclusion is supported by analysis of the infrared spectral energy distribution. These results are consistent with previous observations that quasars at higher redshift tend to have a more prominent cold dust component, most likely powered by extended star formation in the host galaxy. The temperature for the cold dust component is found be T=29±2K when assuming β=1.5 for a modified blackbody. The quasar is found to have a total infrared luminosity of (2.9±0.5)x1013L, dominated by the emission from cool dust.

Abstract Copyright:

Journal keyword(s): quasars: individual: SMM J04135+10277 - infrared: galaxies

Nomenclature: [KVJ2003] SMM JHHMMm+DDMMm N=2.

CDS comments: PG 1206+439 is a misprint for PG 1206+459.

Simbad objects: 12

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Number of rows : 12
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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3160 2
2 Mrk 1502 Sy1 00 53 34.9331107632 +12 41 35.929269132   14.41 14.03     ~ 1108 1
3 PG 0231+051 WD* 02 33 41.3574299856 +05 18 43.649856216 14.562 15.776 16.096 16.267 16.639 DAO.6 144 0
4 NAME SMM J02399-0136 G 02 39 51.87 -01 35 58.8       21.20   ~ 186 2
5 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 482 0
6 NAME SMM J04134+10270 smm 04 13.4 +10 27           ~ 1 0
7 [VV2006] J041327.2+102743 QSO 04 13 27.2 +10 27 43     19.50   19.50 ~ 32 0
8 QSO J0831+5245 QSO 08 31 41.7108197808 +52 45 17.616994560   19.2   14.5 13.9 ~ 518 1
9 QSO J1208+4540 QSO 12 08 58.0107013896 +45 40 35.421692952   16.00 15.70     ~ 186 0
10 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2844 4
11 Mrk 876 Sy1 16 13 57.1795021224 +65 43 09.952685328   16.03 15.49     ~ 543 0
12 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1569 2

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2022.09.25-03:13:31

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