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Star formation in the hosts of GHz peaked spectrum and compact steep spectrum radio galaxie

AIMS: Search for star formation regions in the hosts of potentially young radio galaxies (Gigahertz Peaked Spectrum and Compact Steep Spectrum sources). METHODS: Near-UV imaging with the Hubble Space Telescope Advanced Camera for Surveys.} RESULTS: We find

Astronomy&Astrophysicsmanuscriptno.aa20077112February5,2008

cESO2008

StarformationinthehostsofGHzpeakedspectrumandcompact

steepspectrumradiogalaxies

arXiv:astro-ph/0701619v2 7 Nov 2007

http://www.wenkuxiazai.combiano1,2,C.P.O’Dea3,P.D.Barthel2,W.H.deVries4,5,andS.A.Baum6

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DepartamentodeAstrof´ sicaMoleculareInfrarroja,InstitutodeEstructuradelaMateria(CSIC),Madrid,SpainKapteynAstronomicalInstitute,Groningen,9700AV,TheNetherlands

DepartmentofPhysics,RochesterInstituteofTechnology,Rochester,NY,14623,USAUniversityofCalifornia,Davis,CA95616,USA

LawrenceLivermoreNationalLaboratory,IGPP,Livermore,CA94550,USA

CenterforImagingScience,RochesterInstituteofTechnology,Rochester,http://www.wenkuxiazai.comA

ABSTRACT

Aims.Wesearchedforstarformationregionsinthehostsofpotentiallyyoungradiogalaxies(gigahertzpeakedspectrumandcompactsteepspectrumsources).

Methods.Weusednear-UVimagingwiththeHubbleSpaceTelescopeAdvancedCameraforSurveys.

Results.We ndnear-UVlightcouldbetheproductofrecentstarformationin veofthenineobservedsources,thoughotherexplanationsarenotcurrentlyruledout.Anadditionaltwosourcesshowmarginaldetections.TheUVluminositiesoftheGPSandCSSsourcesaresimilartothoseofasampleofnearbylarge-scaleradiogalaxies.Stellar-populationsynthesismodelsareconsistentwithaburstofrecentstarformationoccurringbeforetheformationoftheradiosource.However,observationsatotherwavelengthsandcolorsareneededtode nitivelyestablishthenatureoftheobservedUVlight.IntheCSSsource1443+77,thenear-UVlightisalignedwithandisco-spatialwiththeradiosource.WesuggestthattheUVlightinthissourceisproducedbystarformationtriggeredand/orenhancedbytheradiosource.

Keywords.Galaxies:active–Galaxies:starburst–Galaxies:evolution–Galaxies:stellarcontent–Galaxies:interaction–Ultraviolet:galaxies

1.Introduction

Therelationshipbetweenblackholemassandgalaxymassim-pliesthatthegrowthandevolutionofblackholes(thereforeAGN)andtheirhostgalaxiesmustsomehowberelated(e.g.,Gebhardtetal.2000).MergersandstronginteractionscantriggerAGNactivityinagalaxy(e.g.,Heckmanetal.1986;Baumetal.1992;Israel1998).TheseeventscanalsoproduceinstabilitiesintheISMandtriggerstarformation(e.g.,Ho2005).Numericalsimulationsandmodels(e.g.,Mellemaetal.2002;Rees1989)suggestthattheadvancementofthejetsthroughthehostgalaxyenvironmentcanalsotriggerstarfor-mation.Imagingstudiesintheultraviolet(UV)lightoflarge3CRsources ndevidenceforepisodesofstarformationstart-ingaroundthetimewhentheradiosourcewastriggered(i.e. 107 108yr,Koekemoeretal.1999;Allenetal.2002;Chiabergeetal.2002;O’Deaetal.2001,2003;Marteletal.2002),suggestingapossible

Star formation in the hosts of GHz peaked spectrum and compact steep spectrum radio galaxie

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