On the absence of molecular absorption in high-redshift millimetre-band searches

Whiting, M. T. (author): University of New South Wales (UNSW),Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Combes, F. (author): LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France

Murphy, M. T. (author): Swinburne University of Technology,University of New South Wales (UNSW)

Wiklind, Tommy, 1957 (author): Chalmers tekniska högskola,Chalmers University of Technology

(creator_code:org_t)

2011-08-01
2011
English.
In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 416:3, s. 2143-2153

Related links:: http://dx.doi.org/10...; show more...; https://academic.oup...; https://research.cha...; https://doi.org/10.1...; show less...

Abstract Subject headings

We have undertaken a search for millimetre-waveband absorption (through the CO and HCO(+) rotational transitions) in the host galaxies of reddened radio sources (z = 0.405-1.802). Despite the colour selection (optical-near-infrared colours of V - K greater than or similar to 5 in all but one source), no absorption was found in any of the eight quasars for which the background continuum flux was detected. On the basis of the previous (mostly intervening) H(2) and OH detections, the limits reached here and in some previous surveys should be deep enough to detect molecular absorption according to their V - K colours. However, our survey makes the assumption that the reddening is associated with dust close to the emission redshift of the quasar and that the narrow millimetre component of this emission is intercepted by the compact molecular cores. By using the known millimetre absorbers to define the colour depth and comparing this with the ultraviolet luminosities of the sources, we find that, even if these assumptions are valid, only 12 of the 40 objects (mainly from this work) are potentially detectable. This is assuming an excitation temperature of T(x) = 10 K at z = 0, with the number decreasing with increasing temperatures (to zero detectable at T(x) greater than or similar to 100 K).

NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

By the author/editor: Curran, S.J.; Whiting, M. T.; Combes, F.; Kuno, N.; Francis, P.; Nakai, N.; show more...; Webb, J. K.; Murphy, M. T.; Wiklind, Tommy, ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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