2007A&A...467..955W


Query : 2007A&A...467..955W

2007A&A...467..955W - Astronomy and Astrophysics, volume 467, 955-969 (2007/6-1)

Highly-excited CO emission in APM 08279+5255 at z = 3.9.

WEISS A., DOWNES D., NERI R., WALTER F., HENKEL C., WILNER D.J., WAGG J. and WIKLIND T.

Abstract (from CDS):

We report the detection of the CO 4-3, 6-5, 9-8, 10-9, and 11-10 lines in the Broad Absorption Line quasar APM 08279+5255 at z=3.9 using the IRAM 30m telescope. We also present IRAM PdBI high spatial resolution observations of the CO 4-3 and 9-8 lines, and of the 1.4mm dust radiation as well as an improved spectrum of the HCN(5-4) line. Unlike CO in other QSO host galaxies, the CO line SED of APM 08279+5255 rises up to the CO(10-9) transition. The line fluxes in the CO ladder and the dust continuum fluxes are best fit by a two component model, a ``cold'' component at ∼65K with a high density of n(H2)=1x105cm–3, and a ``warm'', ∼220K component with a density of 1x104cm–3. We show that IR pumping via the 14µm bending mode of HCN is the most likely channel for the HCN excitation. From our models we find, that the CO(1-0) emission is dominated by the dense gas component which implies that the CO conversion factor is higher than usually assumed for high-z galaxies with α≃5M(K.km/s.pc2)–1. Using brightness temperature arguments, the results from our high-resolution mapping, and lens models from the literature, we argue that the molecular lines and the dust continuum emission arise from a very compact (r≃100-300pc), highly gravitationally magnified (m=60-110) region surrounding the central AGN. Part of the difference relative to other high-z QSOs may therefore be due to the configuration of the gravitational lens, which gives us a high-magnification zoom right into the central 200-pc radius of APM 08279+5255 where IR pumping plays a significant role for the excitation of the molecular lines.

Abstract Copyright:

Journal keyword(s): galaxies: formation - galaxies: high-redshift - ISM: molecules - galaxies: individual: APM 08279+5255 - cosmology: observations - galaxies: quasars: emission lines

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3194 2
2 NAME SMM J02399-0136 G 02 39 51.87 -01 35 58.8       21.20   ~ 188 2
3 M 77 GiP 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4426 2
4 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 3859 3
5 4C 54.15 BLL 07 53 01.38457270 +53 52 59.6370830   18.5   16.77   ~ 143 1
6 7C 080458.39+495918.00 QSO 08 08 39.66628970 +49 50 36.5304041   19.55 19.18 18.34   ~ 343 2
7 QSO J0831+5245 QSO 08 31 41.7108197808 +52 45 17.616994560   19.2   14.5 13.9 ~ 528 1
8 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5679 6
9 SDSS J114816.64+525150.3 QSO 11 48 16.647 +52 51 50.31   25.73 25.04     ~ 433 0
10 QSO B1202-074 QSO 12 05 23.1360370080 -07 42 32.759842896     17.5     ~ 367 5
11 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5637 1
12 QSO J1415+1129 QSO 14 15 46.25 +11 29 43.4   17.63 17.23     ~ 627 0
13 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2873 4
14 NAME SMM J16359+6613 G 16 35 55.62 +66 12 59.5           ~ 60 1
15 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1590 2
16 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13443 0
17 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 772 0
18 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2729 2

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2023.02.01-19:48:34

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