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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The roles of star formation and AGN activity of IRS sources in the HerMES fields
Monthly Notices of the Royal Astronomical Society, Volume 434, No. 3, Year 2013
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Description
In this work, we explore the impact of the presence of an active galactic nucleus (AGN) on the mid- and far-infrared (IR) properties of galaxies as well as the effects of simultaneous AGN and starburst activity in the same galaxies. To do this, we apply a multicomponent, multiband spectral synthesis technique to a sample of 250 μm selected galaxies of the Herschel Multitiered Extragalactic Survey (HerMES), with Infrared Spectrograph (IRS) spectra available for all galaxies. Our results confirm that the inclusion of the IRS spectra plays a crucial role in the spectral analysis of galaxies with an AGN component improving the selection of the best-fitting hot dust (torus) model. We find a correlation between the obscured star formation rate, SFRIR, derived from the IR luminosity of the starburst component, and SFRPAH, derived from the luminosity of the PAH features, LPAH, with SFRFIR taking higher values than SFRPAH. The correlation is different for AGN- and starburst-dominated objects. The ratio of LPAH to that of the starburst component, LPAH/LSB, is almost constant for AGN-dominated objects but decreases with increasing LSB for starburst-dominated objects. SFRFIR increases with the accretion luminosity, Lacc, with the increase less prominent for the very brightest, unobscured AGN-dominated sources. We find no correlation between the masses of the hot (AGN-heated) and cold (starburstheated) dust components. We interpret this as a non-constant fraction of gas driven by the gravitational effects to the AGN while the starburst is ongoing. We also find no evidenceof the AGN affecting the temperature of the cold dust component, though this conclusion is mostly based on objects with a non-dominant AGN component. We conclude that our findings do not provide evidence that the presence of AGN affects the star formation process in the host galaxy, but rather that the two phenomena occur simultaneously over a wide range of luminosities. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Feltre, Anna
Italy, Padua
Università Degli Studi Di Padova
Germany, Garching Bei Munchen
European Southern Observatory
Hatziminaoglou, Evanthia
Germany, Garching Bei Munchen
European Southern Observatory
Hernán-Caballero, Antonio
Spain, Santander
Csic-uc - Instituto de Física de Cantabria Ifca
Fritz, Jacopo
Belgium, Ghent
Universiteit Gent
Franceschini, Alberto
Italy, Padua
Università Degli Studi Di Padova
Bock, James J.
United States, Pasadena
California Institute of Technology
United States, Pasadena
Jet Propulsion Laboratory
Cooray, Asantha Roshan
United States, Pasadena
California Institute of Technology
United States, Irvine
University of California, Irvine
Farrah, Duncan G.
United States, Blacksburg
Virginia Polytechnic Institute and State University
González-Solares, Eduardo A.
United Kingdom, Cambridge
Institute of Astronomy
Ibar, E.
United Kingdom, Edinburgh
Royal Observatory
Chile, Santiago
Pontificia Universidad Católica de Chile
Isaak, Kate G.
Netherlands, Noordwijk Aan Zee
Estec - European Space Research and Technology Centre
Faro, B. Lo
Italy, Padua
Università Degli Studi Di Padova
Marchetti, Lucia
Italy, Padua
Università Degli Studi Di Padova
United Kingdom, Milton Keynes
The Open University
Oliver, Seb J.
United Kingdom, Brighton
University of Sussex
Page, Mathew J.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Rigopoulou, Dimitra
United Kingdom, Didcot
Ral Space
United Kingdom, Oxford
University of Oxford
Roseboom, Isaac G.
United Kingdom, Brighton
University of Sussex
United Kingdom, Edinburgh
University of Edinburgh, Institute for Astronomy
Symeonidis, Myrto
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Vaccari, Mattia
Italy, Padua
Università Degli Studi Di Padova
South Africa, Bellville
University of the Western Cape
Statistics
Citations: 37
Authors: 19
Affiliations: 19
Identifiers
Doi:
10.1093/mnras/stt1177
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cross Sectional Study
Study Approach
Quantitative