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

Identifieur interne : 001839 ( PascalFrancis/Checkpoint ); précédent : 001838; suivant : 001840

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

Auteurs : S. J. Curran [Australie] ; M. T. Whiting [Australie] ; F. Combes [France] ; N. Kuno [Japon] ; P. Francis [Australie] ; N. Nakai [Japon] ; J. K. Webb [Australie] ; M. T. Murphy [Australie] ; T. Wiklind [États-Unis, Suède, Chili]

Source :

RBID : Pascal:11-0409599

Descripteurs français

English descriptors

Abstract

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 ? 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) H2 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 Tx = 10 K at z = 0, with the number decreasing with increasing temperatures (to zero detectable at Tx ? 100 K).


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Pascal:11-0409599

Le document en format XML

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<div type="abstract" xml:lang="en">We have undertaken a search for millimetre-waveband absorption (through the CO and HCO
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<sub>x</sub>
= 10 K at z = 0, with the number decreasing with increasing temperatures (to zero detectable at T
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<s3>SWE</s3>
<sZ>9 aut.</sZ>
</fA14>
<fA14 i1="10">
<s1>Joint ALMA Observatory</s1>
<s2>Santiago</s2>
<s3>CHL</s3>
<sZ>9 aut.</sZ>
</fA14>
<fA20>
<s1>2143-2153</s1>
</fA20>
<fA21>
<s1>2011</s1>
</fA21>
<fA23 i1="01">
<s0>ENG</s0>
</fA23>
<fA43 i1="01">
<s1>INIST</s1>
<s2>2067</s2>
<s5>354000509103310400</s5>
</fA43>
<fA44>
<s0>0000</s0>
<s1>© 2011 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45>
<s0>3/4 p.</s0>
</fA45>
<fA47 i1="01" i2="1">
<s0>11-0409599</s0>
</fA47>
<fA60>
<s1>P</s1>
</fA60>
<fA61>
<s0>A</s0>
</fA61>
<fA64 i1="01" i2="1">
<s0>Monthly Notices of the Royal Astronomical Society</s0>
</fA64>
<fA66 i1="01">
<s0>USA</s0>
</fA66>
<fC01 i1="01" l="ENG">
<s0>We have undertaken a search for millimetre-waveband absorption (through the CO and HCO
<sup>+</sup>
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 ? 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
<sub>2</sub>
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
<sub>x</sub>
= 10 K at z = 0, with the number decreasing with increasing temperatures (to zero detectable at T
<sub>x</sub>
? 100 K).</s0>
</fC01>
<fC02 i1="01" i2="3">
<s0>001E03</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE">
<s0>Absorption moléculaire</s0>
<s5>26</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG">
<s0>Molecular absorption</s0>
<s5>26</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA">
<s0>Absorción molecular</s0>
<s5>26</s5>
</fC03>
<fC03 i1="02" i2="3" l="FRE">
<s0>Déplacement vers le rouge</s0>
<s5>27</s5>
</fC03>
<fC03 i1="02" i2="3" l="ENG">
<s0>Red shift</s0>
<s5>27</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE">
<s0>Transition rotationnelle</s0>
<s5>28</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG">
<s0>Rotational transition</s0>
<s5>28</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA">
<s0>Transición rotacional</s0>
<s5>28</s5>
</fC03>
<fC03 i1="04" i2="3" l="FRE">
<s0>Galaxies actives</s0>
<s5>29</s5>
</fC03>
<fC03 i1="04" i2="3" l="ENG">
<s0>Active galaxies</s0>
<s5>29</s5>
</fC03>
<fC03 i1="05" i2="3" l="FRE">
<s0>Couleur</s0>
<s5>30</s5>
</fC03>
<fC03 i1="05" i2="3" l="ENG">
<s0>Color</s0>
<s5>30</s5>
</fC03>
<fC03 i1="06" i2="3" l="FRE">
<s0>Quasar</s0>
<s5>31</s5>
</fC03>
<fC03 i1="06" i2="3" l="ENG">
<s0>Quasars</s0>
<s5>31</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE">
<s0>Continuum</s0>
<s5>32</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG">
<s0>Continuum</s0>
<s5>32</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA">
<s0>Continuo</s0>
<s5>32</s5>
</fC03>
<fC03 i1="08" i2="3" l="FRE">
<s0>Luminosité</s0>
<s5>33</s5>
</fC03>
<fC03 i1="08" i2="3" l="ENG">
<s0>Luminosity</s0>
<s5>33</s5>
</fC03>
<fC03 i1="09" i2="3" l="FRE">
<s0>Excitation</s0>
<s5>34</s5>
</fC03>
<fC03 i1="09" i2="3" l="ENG">
<s0>Excitation</s0>
<s5>34</s5>
</fC03>
<fC03 i1="10" i2="3" l="FRE">
<s0>Température zéro K</s0>
<s5>35</s5>
</fC03>
<fC03 i1="10" i2="3" l="ENG">
<s0>Temperature zero K</s0>
<s5>35</s5>
</fC03>
<fC03 i1="11" i2="3" l="FRE">
<s0>Abondance</s0>
<s5>36</s5>
</fC03>
<fC03 i1="11" i2="3" l="ENG">
<s0>Abundance</s0>
<s5>36</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE">
<s0>Raie absorption</s0>
<s5>37</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG">
<s0>Absorption line</s0>
<s5>37</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA">
<s0>Raya absorción</s0>
<s5>37</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE">
<s0>Cosmologie</s0>
<s5>38</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG">
<s0>Cosmology</s0>
<s5>38</s5>
</fC03>
<fC03 i1="14" i2="3" l="FRE">
<s0>Radiogalaxies</s0>
<s5>39</s5>
</fC03>
<fC03 i1="14" i2="3" l="ENG">
<s0>Radio galaxies</s0>
<s5>39</s5>
</fC03>
<fC03 i1="15" i2="3" l="FRE">
<s0>Radiosource cosmique</s0>
<s5>40</s5>
</fC03>
<fC03 i1="15" i2="3" l="ENG">
<s0>Cosmic radio sources</s0>
<s5>40</s5>
</fC03>
<fN21>
<s1>283</s1>
</fN21>
<fN44 i1="01">
<s1>OTO</s1>
</fN44>
<fN82>
<s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
<affiliations>
<list>
<country>
<li>Australie</li>
<li>Chili</li>
<li>France</li>
<li>Japon</li>
<li>Suède</li>
<li>États-Unis</li>
</country>
<region>
<li>Île-de-France</li>
</region>
<settlement>
<li>Paris</li>
</settlement>
</list>
<tree>
<country name="Australie">
<noRegion>
<name sortKey="Curran, S J" sort="Curran, S J" uniqKey="Curran S" first="S. J." last="Curran">S. J. Curran</name>
</noRegion>
<name sortKey="Francis, P" sort="Francis, P" uniqKey="Francis P" first="P." last="Francis">P. Francis</name>
<name sortKey="Murphy, M T" sort="Murphy, M T" uniqKey="Murphy M" first="M. T." last="Murphy">M. T. Murphy</name>
<name sortKey="Murphy, M T" sort="Murphy, M T" uniqKey="Murphy M" first="M. T." last="Murphy">M. T. Murphy</name>
<name sortKey="Webb, J K" sort="Webb, J K" uniqKey="Webb J" first="J. K." last="Webb">J. K. Webb</name>
<name sortKey="Whiting, M T" sort="Whiting, M T" uniqKey="Whiting M" first="M. T." last="Whiting">M. T. Whiting</name>
<name sortKey="Whiting, M T" sort="Whiting, M T" uniqKey="Whiting M" first="M. T." last="Whiting">M. T. Whiting</name>
</country>
<country name="France">
<region name="Île-de-France">
<name sortKey="Combes, F" sort="Combes, F" uniqKey="Combes F" first="F." last="Combes">F. Combes</name>
</region>
</country>
<country name="Japon">
<noRegion>
<name sortKey="Kuno, N" sort="Kuno, N" uniqKey="Kuno N" first="N." last="Kuno">N. Kuno</name>
</noRegion>
<name sortKey="Nakai, N" sort="Nakai, N" uniqKey="Nakai N" first="N." last="Nakai">N. Nakai</name>
</country>
<country name="États-Unis">
<noRegion>
<name sortKey="Wiklind, T" sort="Wiklind, T" uniqKey="Wiklind T" first="T." last="Wiklind">T. Wiklind</name>
</noRegion>
</country>
<country name="Suède">
<noRegion>
<name sortKey="Wiklind, T" sort="Wiklind, T" uniqKey="Wiklind T" first="T." last="Wiklind">T. Wiklind</name>
</noRegion>
</country>
<country name="Chili">
<noRegion>
<name sortKey="Wiklind, T" sort="Wiklind, T" uniqKey="Wiklind T" first="T." last="Wiklind">T. Wiklind</name>
</noRegion>
</country>
</tree>
</affiliations>
</record>

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