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H2O megamaser emission from FRI radio galaxies
Henkel, C; Wang, YP; Falcke, H; Wilson, AS; Braatz, JA
AbstractA systematic search for 22 GHz H2O megamaser emission is reported for 50 nearby (z less than or similar to 0.15) FRI galaxies. No detection was obtained, implying that ultraluminous H2O masers (L-H2O > 10(3) L-.) must be rare in early-type galaxies with FR I radio morphology. Despite higher radio core luminosities the detection rate for our sample is lower than in similar surveys of late-type Seyfert galaxies. This puzzling difference between Seyferts and low-power radio galaxies could be explained in several ways: a) the maser emission is saturated and therefore independent of the radio core luminosity, b) the masers are unsaturated and originate in a thin circumnuclear gas disk, so the 'seed' radio continuum would come from the far jet which is relativistically dimmed or c) the amount, kinematics, or the distribution of the molecular gas in the nuclei of Seyferts and radio galaxies is different. Further studies of maser properties may provide clues to the differences between radio-loud and radio-quiet AGN.
KeywordMasers Ism : Molecules Galaxies : Elliptical And Lenticular Galaxies : Ism Galaxies : Active Radio Lines : Galaxies
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000074873700013
Citation statistics
Cited Times:30[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Max Planck Inst Radioastron, D-53121 Bonn, Germany
2.European So Observ, Santiago 19, Chile
3.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
4.Univ Maryland, Dept Astron, College Pk, MD 20742 USA
5.Space Telescope Sci Inst, Baltimore, MD 21218 USA
6.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
Recommended Citation
GB/T 7714
Henkel, C,Wang, YP,Falcke, H,et al. H2O megamaser emission from FRI radio galaxies[J]. ASTRONOMY & ASTROPHYSICS,1998,335(2):463-466.
APA Henkel, C,Wang, YP,Falcke, H,Wilson, AS,&Braatz, JA.(1998).H2O megamaser emission from FRI radio galaxies.ASTRONOMY & ASTROPHYSICS,335(2),463-466.
MLA Henkel, C,et al."H2O megamaser emission from FRI radio galaxies".ASTRONOMY & ASTROPHYSICS 335.2(1998):463-466.
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