Query : 2016A&A...585A.142P

2016A&A...585A.142P - Astronomy and Astrophysics, volume 585A, 142-142 (2016/1-1)

The far-infrared emission of the radio-loud quasar 3C 318.


Abstract (from CDS):

3C 318, a radio-loud quasar at z=1.574, is a subgalactic-sized radio source, and a good test-bed for the interplay between black hole and galaxy growth in the high-z Universe. Based on its IRAS, ISO, and SCUBA detections, it has long been considered as one of the most intrinsically luminous (LIR>1013L) infrared sources in the Universe. Recent far-infrared data from the Herschel Space Observatory reveal that most of the flux associated with 3C 318, measured with earlier instruments, in fact comes from a bright nearby source. Optical imaging and spectroscopy show that this infrared-bright source is a strongly star-forming pair of interacting galaxies at z=0.35. Adding existing Spitzer and SDSS photometry, we perform a spectral energy distribution analysis of the pair, and find that it has a combined infrared luminosity of LIR=1.5x1012L, comparable to other intermediate-redshift ultra-luminous infrared galaxies studied with Herschel. Isolating the emission from 3C 318's host, we robustly constrain the level of star formation to a value a factor of three lower than that published earlier, which is more in line with the star formation activity found in other Herschel-detected 3CR objects at similar redshift.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: high-redshift - galaxies: star formation - infrared: galaxies - quasars: individual: 3C318

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1317 1
2 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1664 0
3 NGC 4039 GiP 12 01 53.8 -18 53 06   11.08   9.77   ~ 1153 1
4 3C 318.0 QSO 15 20 05.4773966208 +20 16 05.471959692   21.93 20.9     ~ 188 1

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