The Contribution of AGNs and Star‐forming Galaxies to the Mid‐Infrared as Revealed by Their Spectral Energy Distributions

Gruppioni, C.; Pozzi, F.; Polletta, M.; Zamorani, G.; Franca, F. La; Sacchi, N.; Comastri, A.; Pozzetti, L.; Vignali, C.; Lonsdale, C. J.; Rowan‐Robinson, M.; Surace, J.; Shupe, D. L.; Fan, Fang; Matute, I.; Berta, S.

doi:10.1086/589848

Cited by 24 publications

(4 citation statements)

References 73 publications

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“…Radio loud sources dominate the source counts down to levels of ∼1 mJy, however, at the sub-mJy level the normalised source counts flatten as a new population of faint radio sources emerge (Windhorst et al 1985). The dominance of starburst galaxies in the sub-mJy population is already well established (Gruppioni et al 2008), where the number of blue galaxies with star-forming spectral signatures is seen to increase strongly. , Hopkins et al (1998), and others have concluded that the source counts at these faintest levels require two populations, AGNs and starburst galaxies.…”

Section: Differential Countsmentioning

confidence: 94%

A deep ATCA 20 cm radio survey of theAKARIDeep Field South near the South Ecliptic Pole

White¹,

Hatsukade

Pearson³

et al. 2012

Monthly Notices of the Royal Astronomical Society

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The results of a deep radio survey at 20 cm wavelength are reported for a region containing the AKARI Deep Field South (ADF-S) near the South Ecliptic Pole (SEP), using the Australia Telescope Compact Array (ATCA). The survey (hereafter referred to as the ATCA-ADFS survey) has 1σ detection limits ranging from 18.7 to 50 µJy beam −1 over an area of ∼1.1 deg 2 , and ∼2.5 deg 2 to lower sensitivity. The observations, data reduction and source count analysis are presented along with a description of the overall scientific objectives, and a catalogue containing 530 radio sources detected with a resolution of 6.2 × 4.9 arcsec. The derived differential source counts show a pronounced excess of sources fainter than ∼1 mJy, consistent with an emerging population of star-forming galaxies. Cross-correlating the radio with AKARI sources and archival data we find 95 cross-matches, with most galaxies having optical R-magnitudes in the range 18-24 mag, similar to that found in other optical deep field identifications, and 52 components lying within 1 arcsec of a radio position in at least one further catalogue (either IR or optical). We have reported redshifts for a sub-sample of our catalogue finding that they vary between galaxies in the local Universe and those having redshifts of up to 0.825. Associating the radio sources with the Spitzer catalogue at 24 µm, we find 173 matches within one Spitzer pixel, of which a small sample of the identifications

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Section: Differential Countsmentioning

confidence: 94%

A deep ATCA 20 cm radio survey of theAKARIDeep Field South near the South Ecliptic Pole

White¹,

Hatsukade

Pearson³

et al. 2012

Monthly Notices of the Royal Astronomical Society

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“…sensitive to, for example, the 'discretization' of the template grids used in the fitting procedure. The systematic uncertainties on stellar masses and far infrared luminosities are likely to be around 0.3 dex (Gruppioni et al 2008;Mancini et al 2011;Santini et al 2015). As L IR,SF is important for our interpretation we also tested how reliable our values are for the targets that lack far infrared photometric detections, by re-fitting all of the other SEDs (with good FIR coverage) but removing the longer wavelength data.…”

Section: Star-formation Rates and Sed Fittingmentioning

confidence: 99%

Prevalence of radio jets associated with galactic outflows and feedback from quasars

Jarvis

Harrison

Thomson

et al. 2019

Monthly Notices of the Royal Astronomical Society

163

313

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We present 1-7 GHz high-resolution radio imaging (VLA and e-MERLIN) and spatially-resolved ionized gas kinematics for ten z < 0.2 type 2 'obscured' quasars (log[L AGN /erg s −1 ] 45) with moderate radio luminosities (log[L 1.4 GHz /W Hz −1 ]=23.3-24.4). These targets were selected to have known ionized outflows based on broad [O iii] emission-line components (FWHM≈800-1800 km s −1 ). Although 'radio-quiet' and not 'radio AGN' by many traditional criteria, we show that for nine of the targets, star formation likely accounts for 10 per cent of the radio emission. We find that ∼80-90 per cent of these nine targets exhibit extended radio structures on 1-25 kpc scales. The quasars' radio morphologies, spectral indices and position on the radio size-luminosity relationship reveals that these sources are consistent with being low power compact radio galaxies. Therefore, we favour radio jets as dominating the radio emission in the majority of these quasars. The radio jets we observe are associated with morphologically and kinematically distinct features in the ionized gas, such as increased turbulence and outflowing bubbles, revealing jetgas interaction on galactic scales. Importantly, such conclusions could not have been drawn from current low-resolution radio surveys such as FIRST. Our observations support a scenario where compact radio jets, with modest radio luminosities, are a crucial feedback mechanism for massive galaxies during a quasar phase.

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“…Radio loud sources dominate the source counts down to levels of ∼1 mJy, however, at the sub-mJy level the normalised source counts flatten as a new population of faint radio sources emerge (Windhorst et al 1985). The dominance of starburst galaxies in the sub-mJy population is already well established (Gruppioni et al 2008), where the number of blue galaxies with star-forming spectral signatures is seen to increase strongly. Rowan-Robinson et al (1993), Hopkins et al (1998), and others have concluded that the source counts at these faintest levels require two populations, AGNs and starburst galaxies.…”

Section: Differential Countsmentioning

confidence: 93%

A deep survey of the AKARI north ecliptic pole field

White

Pearson

Braun

et al. 2010

A&A

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Aims. The Westerbork Radio Synthesis Telescope, WSRT, has been used to make a deep radio survey of an ∼1.7 degree 2 field coinciding with the AKARI north ecliptic pole deep field. The observations, data reduction and source count analysis are presented, along with a description of the overall scientific objectives. Methods. The survey consisted of 10 pointings, mosaiced with enough overlap to maintain a similar sensitivity across the central region that reached as low as 21 μJy beam −1 at 1.4 GHz. Results. A catalogue containing 462 sources detected with a resolution of 17.0 × 15.5 is presented. The differential source counts calculated from the WSRT data have been compared with those from the shallow VLA − NEP survey of Kollgaard et al. 1994, and show a pronounced excess for sources fainter than ∼1 mJy, consistent with the presence of a population of star forming galaxies at sub-mJy flux levels. Conclusions. The AKARI north ecliptic pole deep field is the focus of a major observing campaign conducted across the entire spectral region. The combination of these data sets, along with the deep nature of the radio observations will allow unique studies of a large range of topics including the redshift evolution of the luminosity function of radio sources, the clustering environment of radio galaxies, the nature of obscured radio-loud active galactic nuclei, and the radio/far-infrared correlation for distant galaxies. This catalogue provides the basic data set for a future series of paper dealing with source identifications, morphologies, and the associated properties of the identified radio sources.

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The Contribution of AGNs and Star‐forming Galaxies to the Mid‐Infrared as Revealed by Their Spectral Energy Distributions

Cited by 24 publications

References 73 publications

A deep ATCA 20 cm radio survey of theAKARIDeep Field South near the South Ecliptic Pole

A deep ATCA 20 cm radio survey of theAKARIDeep Field South near the South Ecliptic Pole

Prevalence of radio jets associated with galactic outflows and feedback from quasars

A deep survey of the AKARI north ecliptic pole field

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