HerMES: Far infrared properties of known AGN in the HerMES fields

By E. Hatziminaoglou, A. Omont, J. Stevens, A. Amblard, V. Arumugam, R. Auld, H. Aussel, T. Babbedge, A. Blain, J. Bock and 65 more. 2010

138 citations recorded by the source corpus.

Nuclear and starburst activity are known to often occur concomitantly. Herschel-SPIRE provides sampling of the FIR 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 5-sigma detections at 250um, in agreement with previous (sub)mm AGN studies. Their combined Spitzer-MIPS and Herschel-SPIRE colours - specifically S(250)/S(70) vs. S(70)/S(24) - quite clearly separate them from the non-AGN, star-forming galaxy population, as their 24-um 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, L(SB), and the AGN accretion luminosity, L(acc), with L(SB) propto L(acc)^0.35. Type 2 AGN detected at 250um show on average higher L(SB) than type 1 objects but their number is still too low to establish whether this trend indicates stronger star-formation activity.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/3f180a6ebf0f7c0000e005106963db2a0d477f11

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Citations in the corpus

Panchromatic spectral energy distributions of Herschel sources (2013, background): “In addition, the variety of Herschel detections includes objects with MIR power-law spectra, dominated by an AGN torus emission, but with optical stel ar SEDs (e.g. Hatziminaoglou et al. 2010), as well as type-1 AGN.”
The mean star formation rate of X-ray selected active galaxies and its evolution from z~2.5: results from PEP-Herschel (2012, background): “We suggest that relationships between star-formation and nuclear activity in AGNs in the litrature that are based on individual detections from shallow, largearea surveys may be strongly affected by such selection eff cts (e.g., Hatziminaoglou et al. 2010).”
THE EVOLVING INTERSTELLAR MEDIUM OF STAR-FORMING GALAXIES SINCE z = 2 AS PROBED BY THEIR INFRARED SPECTRAL ENERGY DISTRIBUTIONS (2012, result): “The inferred 〈U〉 values are very close to the values derived when considering the whole set of photometric points, in agreement with various studies that find a negligible effect of an AGN in the far-IR colours of a galaxy (e.g., Hatziminaoglou et al. 2010, Mullaney et al. 2012).”
A CORRELATION BETWEEN STAR FORMATION RATE AND AVERAGE BLACK HOLE ACCRETION IN STAR-FORMING GALAXIES (2013, background): “By contrast, far-IR observations have been shown to suffer minimum contamination from AGN (e.g. Netzer et al. 2007; Hatziminaoglou et al. 2010; Mullaney et al. 2011; Kirkpatrick et al. 2012), which makes far-IR emission a better tracer of the star formation relatedLIR in an AGN-hosting galaxy…”
Tracing the cosmic growth of supermassive black holes to z ∼ 3 with Herschel (2014, background): “Recent Herschel-based studies are shedding light on the mid-to-far infrared properties of star-forming galaxies (Hatziminaoglou et al. 2010; Rowan-Robinson et al. 2010; Hwang et al. 2010; Elbaz et al. 2011; Sajina et al. 2012; Smith et al. 2012; Symeonidis et al. 2013; Magdis et al. 2013), both in…”
Herschel unveils a puzzling uniformity of distant dusty galaxies (2010, background): “This again shows that in the regime where star formation dominates the IR emission of AGNs, this activity does not differ from normal star-forming galaxies (see also Shao et al. 2010; Hatziminaoglou et al. 2010).”
Active galactic nuclei: what’s in a name? (2017, background): “As significant SF activity is regularly ongoing in the host galaxies of many AGN, it is more likely to dominate the FIR (e.g. Hatziminaoglou et al. 2010).”
Enhanced star formation rates in AGN hosts with respect to inactive galaxies from PEP-Herschel observations (2012, methodology): “Similar results were also obtained by Hatziminaoglou et al. (2010) using SPIRE (250, 350 and 500 µm) colours.”
The dust covering factor in active galactic nuclei (2016, background): “But we must keep in mind that in the FIR, the host galaxy contribution is very often dominant over the AGN (e.g. Hatziminaoglou et al. 2008, 2009, 2010).”
Constraining the properties of AGN host galaxies with spectral energy distribution modelling (2015, methodology): “Furthermore, this library has been tested in numerous studies of the literature (e.g., Fritz et al. 2006; Hatziminaoglou et al. 2008, 2010; Feltre et al. 2012).”
The Herschel census of infrared SEDs through cosmic time (2013, background): “…and Photometric Imaging Receiver (SPIRE; Griffin et al. 2010) instruments has enabled spectral energy distributions (SEDs) to be compiled for a large range of objects, both for AGN (e.g. Hatziminaoglou et al. 2010; Seymour et al. 2011) and star-forming galaxies (e.g. Rowan-Robinson et al. 2010).”
HERSCHEL-ATLAS GALAXY COUNTS AND HIGH-REDSHIFT LUMINOSITY FUNCTIONS: THE FORMATION OF MASSIVE EARLY-TYPE GALAXIES (2011, background): “The AGN dust emission peaks in the mid-IR (Granato & Danese 1994; Andreani et al. 2010; Lutz et al. 2010; Hatziminaoglou et al. 2010) and can be safely ignored in the SPIRE wavelength range.”
GOODS-Herschel: the far-infrared view of star formation in active galactic nucleus host galaxies since z ≈ 3 (2011, background): “…(hereafter, FIR) regime is largely impervious to obscuration and, except in the most extreme cases (e.g., Hony et al. 2011), provides a measure of the star formation activity of the host galaxy that is largely uncontaminated by the AGN (e.g., Netzer et al. 2007; Hatziminaoglou et al. 2010).”
The Herschel view of the dominant mode of galaxy growth from z = 4 to the present day (2014, background): “Indeed, while the most extreme AGNs may affect mid-to-far IR colors, such as 24-to70 μm color, their far-IR colors are indistinguishable from that of star-forming galaxies (Hatziminaoglou et al. 2010).”
The Herschel Multi-tiered Extragalactic Survey: HerMES (2012, unknown): “The central importance of far-infrared (FIR) and submillimetre (submm) observations becomes clear when one realizes that the approximately half of all the luminous power (Puget et al. 1996; Fixsen et al. 1998; Lagache, Puget & Gispert 1999) which makes up the extragalactic background radiation – pow”
Smooth and clumpy dust distributions in AGN: a direct comparison of two commonly explored infrared emission models (2012, methodology): “The original models are among the most popular smooth models in the literature to date (see e.g. Rodighiero et al. 2007; Berta et al. 2007; Hatziminaoglou et al. 2008, 2009, 2010; Agol et al. 2009; Pozzi et al. 2010; Natale et al. 2010; Vignali et al. 2009, 2011).”