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Molecules at z=0.89: A 4-mm-rest-frame absorption line survey toward PKS 1830-211 | | S. Muller
; A. Beelen
; M. Guélin
; S. Aalto
; J. H. Black
; F. Combes
; S. Curran
; P. Theule
; S. Longmore
; | | Date: |
18 Apr 2011 | | Abstract: | We present the results of a wide 7 mm spectral survey of molecular absorption
lines arising in the disk of a z=0.89 spiral galaxy located in front of the
quasar PKS 1830-211. The survey was done with the Australia Telescope Compact
Array and covers the frequency interval 30-50 GHz, corresponding to the
rest-frame frequency interval 57-94 GHz. A total of 28 different species, plus
8 isotopic variants, were detected toward the South-West absorption, located at
about 2 kpc from the center of the z=0.89 galaxy, which makes it the
extragalactic object with the largest number of detected molecular species so
far. Results from rotation diagram analysis show that the rotation temperatures
are close to the Cosmic Microwave Background temperature expected at z=0.89,
5.14 K, [..]. The molecular fractional abundances are found to be intermediate
between those in typical Galactic diffuse and translucent clouds, and clearly
deviate from those observed in the dark cloud TMC1 or in the Galactic center
giant molecular cloud Sgr B2. The isotopic ratios of carbon, nitrogen, oxygen
and silicon deviate significantly from the Solar values, which can be linked
with the young age of the z=0.89 galaxy and a release of nucleosynthesis
products dominated by massive stars [...] Finally, we investigate the
kinematics and line profiles of the different species. [...] Conservatively, we
obtain an upper limit Delta mu/mu<2x10^{-6}, taking into account the velocity
dispersion measured from a large number of molecular species. Further
observations of lines with different sensitivity coefficients will be required
to put stronger constraints on variations of mu. | | Source: | arXiv, 1104.3361 | | Services: | Forum | Review | PDF | Favorites | |
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