Bibcode
Hatziminaoglou, E.; Omont, A.; Stevens, J. A.; Amblard, A.; Arumugam, V.; Auld, R.; Aussel, H.; Babbedge, T.; Blain, A.; Bock, J.; Boselli, A.; Buat, V.; Burgarella, D.; Castro-Rodríguez, N.; Cava, A.; Chanial, P.; Clements, D. L.; Conley, A.; Conversi, L.; Cooray, A.; Dowell, C. D.; Dwek, E.; Dye, S.; Eales, S.; Elbaz, D.; Farrah, D.; Fox, M.; Franceschini, A.; Gear, W.; Glenn, J.; González Solares, E. A.; Griffin, M.; Halpern, M.; Ibar, E.; Isaak, K.; Ivison, R. J.; Lagache, G.; Levenson, L.; Lu, N.; Madden, S.; Maffei, B.; Mainetti, G.; Marchetti, L.; Mortier, A. M. J.; Nguyen, H. T.; O'Halloran, B.; Oliver, S. J.; Page, M. J.; Panuzzo, P.; Papageorgiou, A.; Pearson, C. P.; Pérez-Fournon, I.; Pohlen, M.; Rawlings, J. I.; Rigopoulou, D.; Rizzo, D.; Roseboom, I. G.; Rowan-Robinson, M.; Sanchez Portal, M.; Schulz, B.; Scott, D.; Seymour, N.; Shupe, D. L.; Smith, A. J.; Symeonidis, M.; Trichas, M.; Tugwell, K. E.; Vaccari, M.; Valtchanov, I.; Vigroux, L.; Wang, L.; Ward, R.; Wright, G.; Xu, C. K.; Zemcov, M.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 518, id.L33
Advertised on:
7
2010
Revista
Número de citas
148
Número de citas referidas
143
Descripción
Nuclear and starburst activity are known to often occur concomitantly.
Herschel-SPIRE provides sampling of the far-infrared (FIR) spectral
energy distributions (SEDs) of type 1 and type 2 AGN, allowing for the
separation between the hot dust (torus) and cold dust (starburst)
emission. We study large samples of spectroscopically confirmed type 1
and type 2 AGN lying within the Herschel Multi-tiered Extragalactic
Survey (HerMES) fields observed during the science demonstration phase,
aiming to understand their FIR colour distributions and constrain their
starburst contributions. We find that one third of the spectroscopically
confirmed AGN in the HerMES fields have 5σ detections at 250
μm, in agreement with previous (sub)mm AGN studies. Their combined
Spitzer-MIPS and Herschel-SPIRE colours (specifically
S250/S70 vs S70/S24) quite
clearly separate them from the non-AGN, star forming galaxy population,
as their 24 μm flux is dominated by the hot torus emission. However,
their SPIRE colours alone do not differ from those of non-AGN galaxies.
SED fitting shows that all those AGN need a starburst component to fully
account for their FIR emission. For objects at z > 2 we find a
correlation between the infrared luminosity attributed to the starburst
component, LSB, and the AGN accretion luminosity,
Lacc, with LSB ∝
Lacc0.35. Type 2 AGN detected at 250 μm show on
average higher LSB than type 1 objects but their number is
still too low to establish whether this trend indicates stronger star
formation activity.
Herschel is an ESA space observatory with science instruments provided
by European-led Principal Investigator consortia and with important
participation from NASA.
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