Detection of atomic carbon [CII] 158 micron and dust emission from a z=7.1 quasar host galaxy

Дата и время публикации : 2012-03-27T00:04:45Z

Авторы публикации и институты :
B. P. Venemans (MPIA Heidelberg, ESO Garching)
R. G. McMahon (IoA Cambridge, KICC, Cambridge)
F. Walter (MPIA Heidelberg)
R. Decarli (MPIA Heidelberg)
P. Cox (IRAM)
R. Neri (IRAM)
P. Hewett (IoA Cambridge)
D. J. Mortlock (Imperial College London)
C. Simpson (Liverpool Johns Moores University)
S. J. Warren (Imperial College London)

Ссылка на журнал-издание: 2012, ApJ 751, L25
Коментарии к cтатье: 7 pages, 3 figures. Published in ApJ Letters
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: Using the IRAM Plateau de Bure Interferometer, we report the detection of the 158 micron [CII] emission line and underlying dust continuum in the host galaxy of the quasar ULAS J112001.48+064124.3 (hereafter J1120+0641) at z=7.0842+/-0.0004. This is the highest redshift detection of the [CII] line to date, and allows us to put first constraints on the physical properties of the host galaxy. The [CII] line luminosity is (1.2+/-0.2)x10^9 Lsun, which is a factor ~4 lower than observed in a luminous quasar at z=6.42 (SDSS J1148+5251). The underlying far-infrared (FIR) continuum has a flux density of 0.61+/-0.16 mJy, similar to the average flux density of z~6 quasars that were not individually detected in the rest-frame FIR. Assuming the FIR luminosity of L_FIR = 5.8×10^11-1.8×10^12 Lsun is mainly powered by star-formation, we derive a star-formation rate in the range 160-440 Msun/yr and a total dust mass in the host galaxy of 6.7×10^7-5.7×10^8 Msun (both numbers have significant uncertainties given the unknown nature of dust at these redshifts). The [CII] line width of sigma_V=100+/-15 km/s is among the smallest observed when compared to the molecular line widths detected in z~6 quasars. Both the [CII] and dust continuum emission are spatially unresolved at the current angular resolution of 2.0×1.7 arcsec^2 (corresponding to 10×9 kpc^2 at the redshift of J1120+0641).

Category: Physics