A search for molecular gas in restarting radio galaxies

Saripalli, Lakshmi; Mack, K.H.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2288

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DC Field	Value	Language
dc.contributor.author	Saripalli, Lakshmi	-
dc.contributor.author	Mack, K.H.	-
dc.date.accessioned	2007-04-25T10:40:49Z	-
dc.date.available	2007-04-25T10:40:49Z	-
dc.date.issued	2007-04	-
dc.identifier.citation	Monthly Notices of the Royal Astronomical Society, 2007, Vol.376, p1385-1392	en
dc.identifier.issn	0035-8711	-
dc.identifier.uri	http://hdl.handle.net/2289/2288	-
dc.description	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)	en
dc.description.abstract	Several radio galaxies are known that show radio morphological signatures that are best interpreted as restarting of nuclear activity after a period of quiescence. The conditions surrounding the phenomenon of nuclear recurrence are not understood. In this paper we have attempted to address this question by examining the nuclear fuelling characteristics in a sample of restarting radio galaxies. We have examined the detection rate for molecular gas in a representative sample of nine restarting radio galaxies, for seven of which we present new upper limits to the molecular gas mass derived from CO line observations we made with the IRAM 30-m telescope. We derive a low CO detection rate for the relatively young restarted radio galaxies suggesting that the cessation of the nuclear activity and its subsequent restarting may be a result of instabilities in the fuelling process rather than a case of depletion of fuel followed by a recent fuel acquisition. It appears that abundant molecular gas content at the level of few 108–109 Mo does not necessarily accompany the nuclear restarting phenomenon. For comparison we also discuss the molecular gas properties of five normal giant radio galaxies, three of which we observed using Swedish-ESO Millimetre Telescope (SEST). Despite obvious signs of interactions and nuclear dust discs none of them has been found to host significant quantities of molecular gas.	en
dc.format.extent	321627 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	Blackwell Publishing for the Royal Astronomical Society	en
dc.relation.uri	http://adsabs.harvard.edu/cgi-bin/bib_query?2007MNRAS.tmp..120S	en
dc.relation.uri	http://arxiv.org/abs/astro-ph/0702376	en
dc.relation.uri	http://dx.doi.org/10.1111/j.1365-2966.2007.11544.x	en
dc.rights	2007 Royal Astronomical Society	en
dc.title	A search for molecular gas in restarting radio galaxies	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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