Infrared Properties of High Redshift and X-ray Selected AGN Samples

Wilkes, Belinda; Hooper, E. J.; McLeod, Kim K.; Elvis, M.; Hughes, D. H.; Impey, C. D.; Kuraszkiewicz, Joanna; Lonsdale, C.; Malkan, M.; McDowell, Jonathan

doi:10.1007/3-540-45553-1_23

Cited by 5 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ISOPHOT observations of the 2-200 µm SEDs of Seyferts, radio galaxies and QSOs have confirmed these conclusions and improved the quality and spectral detail of the data (Haas et al 1999, Wilkes et al 1999, Rodriguez Espinosa et al 1996, Perez Garcia et al 1998. As part of the European Central Quasar Program (~70 QSOs and radio galaxies) Haas et al (1998aHaas et al ( , 1999 report ISOPHOT/IRAS SEDs, with additional 1.3mm points from the IRAM 30m telescope, for two dozen (mainly radio-quiet) PG QSOs.…”

Section: The Source Of Far-infrared Luminosity In Seyfert Galaxies Anmentioning

confidence: 84%

“…This finding suggests that the far-IR emission in QSOs is a distinct physical component that may not be physically related to the shorter wavelength emission. Wilkes et al (1999) report the first results of the US Central QSO program that contains another 70 objects and extends to z=4.7. These data confirm as well the presence of thermal dust emission with a wide range of temperatures.…”

Section: The Source Of Far-infrared Luminosity In Seyfert Galaxies Anmentioning

confidence: 99%

See 1 more Smart Citation

Extragalactic Results from the Infrared Space Observatory

Genzel

Césarsky

2000

Annu. Rev. Astron. Astrophys.

274

285

View full text Add to dashboard Cite

More than a decade ago the IRAS satellite opened the realm of external galaxies for studies in the 10 to 100µm band and discovered emission from tens of thousands of normal and active galaxies.With the 1995-1998 mission of the Infrared Space Observatory 1 the next major steps in extragalactic infrared astronomy became possible: detailed imaging, spectroscopy and spectro-photometry of many galaxies detected by IRAS, as well as deep surveys in the mid-and far-IR. The spectroscopic data reveal a wealth of detail about the nature of the energy source(s) and about the physical conditions in galaxies. ISO's surveys for the first time explore the infrared emission of distant, high-redshift galaxies. ISO's main theme in extragalactic astronomy is the role of star formation in the activity and evolution of galaxies.

show abstract

Section: The Source Of Far-infrared Luminosity In Seyfert Galaxies Anmentioning

confidence: 84%

Section: The Source Of Far-infrared Luminosity In Seyfert Galaxies Anmentioning

confidence: 99%

Extragalactic Results from the Infrared Space Observatory

Genzel

Césarsky

2000

Annu. Rev. Astron. Astrophys.

274

285

View full text Add to dashboard Cite

show abstract

“…In hoping to detect more quasars, several groups have carried out mid-and far-infrared photometry using the Infrared Space Observatory (ISO; Kessler et al 1996). The first report of the ISO European Central Quasar Programme which observed 70 quasars between 4.8 and 200 µm including high-redshift quasars has been published by Haas et al (1998), and the ISO/N ASA AGN Key Project has also observed 72 quasars and AGNs covering a range of redshift up to 4.7 (Wilkes et al 1999).…”

Section: Havementioning

confidence: 99%

ISO continuum observations of quasars at ${z=1{-}4}$

Oyabu

Kawara

Tsuzuki

et al. 2001

A&A

View full text Add to dashboard Cite

Abstract. Eight luminous quasars with −30 < MB < −27 at z = 1.4−3.7 have been observed in the mid-and farinfrared using ISO. All the quasars have been detected in the mid-infrared bands of ISOCAM, while no far-infrared detections have been made with ISOPHOT. SEDs (Spectral Energy Distributions) from the UV to far-infrared have been obtained while supplementing ISO observations with photometry in the optical and near-infrared made from the ground within 17 months. The SEDs are compared with the MED (Mean spectral Energy Distributions) of low-redshift quasars with −27 < MB < −22. It is shown that our far-infrared observations were limited by confusion noise due to crowded sources.

show abstract

“…Granato et al 1996;Andreani et al 1999). These models are attractive because of the similar ratios of far-IR to mid-IR fluxes in quasars of widely different luminosities (Haas et al 1998;Wilkes et al 1999). However, they require a large amount of relatively cool dust at large radii (up to ∼ 1 kpc) from the quasar.…”

Section: C 318: a Hyperluminous Infrared Quasarmentioning

confidence: 99%

The hyperluminous infrared quasar 3C 318 and its implications for interpreting submm detections of high-redshift radio galaxies

Rawlings¹,

Jarvis²

2000

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We present near‐infrared spectroscopy and imaging of the compact steep‐spectrum radio source 3C 318, which shows it to be a quasar at redshift z=1.574 (the z=0.752 value previously reported is incorrect). 3C 318 is an IRAS, ISO and SCUBA source so its new redshift makes it the most intrinsically luminous far‐infrared (FIR) source in the 3C catalogue (there is no evidence of strong gravitational lensing effects). Its bolometric luminosity greatly exceeds the 1013 L⊙ level above which an object is said to be hyperluminous. Its spectral energy distribution (SED) requires that the quasar heats the dust responsible for the FIR flux, as is believed to be the case in other hyperluminous galaxies, and contributes (at the >10 per cent level) to the heating of the dust responsible for the submm emission. We cannot determine whether a starburst makes an important contribution to the heating of the coolest dust, so evidence for a high star formation rate is circumstantial, being based on the high dust, and hence gas, mass required by its submm detection. We show that the current submm and FIR data available for the highest‐redshift radio galaxies are consistent with SEDs similar to that of 3C 318. This indicates that at least some of this population may be detected in the submm because of dust heated by the quasar nucleus, and that interpreting submm detection as evidence for very high (≳1000 M⊙ yr−1) star formation rates may not always be valid. We show that the 3C 318 quasar is slightly reddened (AV≈0.5), the most likely cause of which is SMC‐type dust in the host galaxy. If very distant radio galaxies are reddened in a similar way then we show that only slightly greater amounts of dust could obscure the quasars in these sources. We speculate that the low fraction of quasars amongst the very high redshift (z≳3) objects in low‐frequency radio‐selected samples is the result of such obscuration. The highest‐z objects might be preferentially obscured because like 3C 318 they are inevitably observed very shortly after the jet‐triggering event, or because their host galaxies are richer in dust and gas at earlier cosmic epochs, or because of some combination of these two effects.

show abstract

Infrared Properties of High Redshift and X-ray Selected AGN Samples

Cited by 5 publications

References 31 publications

Extragalactic Results from the Infrared Space Observatory

Extragalactic Results from the Infrared Space Observatory

ISO continuum observations of quasars at ${z=1{-}4}$

The hyperluminous infrared quasar 3C 318 and its implications for interpreting submm detections of high-redshift radio galaxies

Contact Info

Product

Resources

About