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WISE colours and star formation in the host galaxies of radio-loud narrow-line Seyfert 1

AuthorsCaccianiga, A.; Antón, Sonia; Ballo, Lucía ; Foschini, L.; Maccacaro, T.; Della Ceca, R. ; Severgnini, P.; Marchã, M. J.; Mateos, Silvia ; Sani, E.
KeywordsGalaxies: jets
Galaxies: starburst
Galaxies: nuclei
Galaxies: active
Issue Date2015
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 451(2): 1795-1805 (2015)
AbstractWe investigate the mid-infrared (mid-IR) properties of the largest (42 objects) sample of radio-loud narrow-line Seyfert 1 (RL NLS1) collected to date, using data from the Wide-field Infrared Survey Explorer. We analyse the mid-IR colours of these objects and compare them to what is expected from different combinations of AGN and galaxy templates. We find that, in general, the host galaxy emission gives an important contribution to the observed mid-IR flux in particular at the longest wavelengths (W3, at 12 μm, and W4, at 22 μm). In about half of the sources (22 objects), we observe a very red mid-IR colour (W4 - W3 > 2.5) that can be explained only using a starburst galaxy template (M82). Using the 22 μm luminosities, corrected for the AGN contribution, we have then estimated the star formation rate (SFR) for 20 of these 'red' RL NLS1, finding values ranging from 10 to 500M⊙ yr<sup>-1</sup>. For the RLNLS1 showing bluer colours, instead, we cannot exclude the presence of a star-forming (SF) host galaxy although, on average, we expect a lower SFR. Studying the radio (1.4 GHz) to mid-IR (22 μm) flux ratios of the RL NLS1 in the sample, we found that in ~10 objects the SF activity could represent the most important component also at radio frequencies, in addition (or in alternative) to the relativistic jet. We conclude that both the mid-IR and the radio emission of RL NLS1 are a mixture of different components, including the relativistic jet, the dusty torus and an intense SF activity.
Publisher version (URL)https://doi.org/10.1093/mnras/stv939
Identifiersdoi: 10.1093/mnras/stv939
e-issn: 1365-2966
issn: 0035-8711
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(IAA) Artículos
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