The Nuclear to Host Galaxy Relation of High‐Redshift Quasars

Kotilainen, Jari; Falomo, R.; Labita, M.; Treves, A.; Uslenghi, M.

doi:10.1086/512847

Cited by 42 publications

(71 citation statements)

References 50 publications

(118 reference statements)

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“…At high redshift, the host galaxies appear to be consistent with elliptical morphologies Hyvönen et al 2007;Falomo et al 2004;Kotilainen et al 2007;Falomo et al 2008;Ammons et al 2009), despite the difficulties in constraining the types unambiguously. The merger fraction is <30%, not significantly different from field galaxies.…”

Section: Comparisons With Host Galaxy Morphology Studiesmentioning

confidence: 88%

COSMIC EVOLUTION OF STAR FORMATION IN TYPE-1 QUASAR HOSTS SINCEz= 1

Shi

Rieke

Ogle

et al. 2009

ApJ

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We present Spitzer Infrared Spectrograph observations of a complete sample of 57 Sloan Digital Sky Survey type-1 quasars at z ∼ 1. Aromatic features at 6.2 and/or 7.7 μm are detected in about half of the sample and show profiles similar to those seen in normal galaxies at both low and high redshift, indicating a star formation origin for the features. Based on the ratio of aromatic to star formation infrared (SFIR) luminosities for normal star-forming galaxies at z ∼ 1, we have constructed the SFIR luminosity function (LF) of z ∼ 1 quasars. As we found earlier for low-redshift Palomar-Green (PG) quasars, these z ∼ 1 quasars show a flatter SFIR LF than do z ∼ 1 field galaxies, implying the quasar host galaxy population has on average a higher star formation rate (SFR) than the field galaxies do. As measured from their SFIR LF, individual quasar hosts have on average LIRG-level SFRs, which mainly arise in the circumnuclear regions. By comparing with similar measurements of low-redshift PG quasars, we find that the comoving SFIR luminosity density in quasar hosts shows a much larger increase with redshift than that in field galaxies. The behavior is consistent with pure density evolution since the average SFR and the average SFR/BH accretion rate in quasar hosts show little evolution with redshift. For individual quasars, we have found a correlation between the aromatic-based SFR and the luminosity of the nuclear radiation, consistent with predictions of some theoretical models. We propose that type-1 quasars reside in a distinct galaxy population that shows elliptical morphology but that harbors a significant fraction of intermediate-age stars and is experiencing intense circumnuclear star formation.

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Section: Comparisons With Host Galaxy Morphology Studiesmentioning

confidence: 88%

COSMIC EVOLUTION OF STAR FORMATION IN TYPE-1 QUASAR HOSTS SINCEz= 1

Shi

Rieke

Ogle

et al. 2009

ApJ

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“…For their z ≈ 1.5−2 sample they found a value of 9.78 ± 6.58 kpc for objects where it could be determined and upper limits (<10 kpc) for the remaining sources. Kotilainen et al (2007) found values of 6.7 ± 1.7 kpc for their z ≈ 1−2 sample (observed in K and H). Falomo et al (2008) found values between 2.6 kpc and 11.3 kpc for a sample of three high redshift quasars (z ≈ 2−3) observed in Ks.…”

Section: Host Galaxy Radiimentioning

confidence: 92%

“…Dunlop et al 2003;Percival et al 2001) up to very high redshifts of z ∼ 3 (e.g. Ridgway et al 2001;Falomo et al 2004Falomo et al , 2008Jahnke et al 2004;Kotilainen et al 2007). It is nowadays established that formation rates or ages of the host galaxy are difficult or even impossible.…”

Section: Introductionmentioning

confidence: 99%

Quasar host galaxies in the FORS deep field

Villforth

Heidt²,

Nilsson

2008

A&A

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Context. The evolution of quasar host galaxies is still hardly studied at high redshifts (z > 2), although this is a very interesting redshift range as both the quasar activity and the star formation rate density have their peak at z ≈ 2−3. This makes it especially interesting to study properties of quasar host galaxies, such as the star formation rate or the black hole mass at this redshift. A proper classification of quasar host galaxies at high redshift would help to answer the question which role quasars play in galaxy evolution. Aims. In this paper we study different properties of quasars and their host galaxies at high redshifts up to z ≈ 3.4. We compare our results to those of other authors and discuss the correlation between galaxy evolution and quasar activity. Methods. We analysed broad-band images in eight filters (from U to K) of eight quasars in the FORS Deep Field with redshifts between z = 0.87 and z = 3.37. A fully 2-dimensional decomposition was carried out to detect and resolve the host galaxies. Using the magnitudes in different filters, we investigated the presumed galaxy type, galaxy age, star formation rate and the mass of the central black hole of the host galaxies. In addition, the masses of the central black hole for the whole sample were derived using the corresponding quasar spectra. Results. We were able to resolve the host galaxies of two out of eight quasars between z = 0.87 and z = 2.75. Additionally, two host galaxies were possibly resolved. Conclusions. The resolved low-redshift quasar (z = 0.865) was identified as a late type galaxy with a moderate star formation rate of 1.8 M /yr hosting a supermassive black hole with a mass of < ∼ 10 8 M . The resolved high redshift host galaxy (z = 2.7515) shows moderate star formation of 4.4−6.9 M /yr, for the black hole mass we found a lower limit of >10 7 M . All quasars host supermassive black hole with masses in the range ∼10 7 −10 9 M . Our findings are well consistent with those of other authors.

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“…They follow closely the correlation found between MBH and the host galaxy luminosity. Figure 10 plots the absolute R-band magnitudes of the quasar hosts versus those of their nuclei, as well as the Rband magnitudes as a function of redshift, for the AO sample as well as other quasars compiled by Kotilainen et al (2007) and Falomo et al (2008). In both plots, the four systems with robust host luminosities occupy the loci found for radio quiet quasars.…”

Section: Quasar Host Galaxies In the Ao Samplementioning

confidence: 98%

Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey

Rusu

Oguri

Minowa

et al. 2016

Mon. Not. R. Astron. Soc.

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We present the results of an imaging observation campaign conducted with the Subaru Telescope adaptive optics system (IRCS+AO188) on 28 gravitationally lensed quasars and candidates (23 doubles, 1 quad, 1 possible triple and 3 candidates) from the SDSS Quasar Lens Search. We develop a novel modelling technique that fits analytical and hybrid point spread functions (PSFs), while simultaneously measuring the relative astrometry, photometry, as well as the lens galaxy morphology. We account for systematics by simulating the observed systems using separately observed PSF stars. The measured relative astrometry is comparable with that typically achieved with the Hubble Space Telescope, even after marginalizing over the PSF uncertainty. We model for the first time the quasar host galaxies in 5 systems, without a-priory knowledge of the PSF, and show that their luminosities follow the known correlation with the mass of the supermassive black hole. For each system, we obtain mass models far more accurate than those previously published from low-resolution data, and we show that in our sample of lensing galaxies the observed light profile is more elliptical than the mass, for ellipticity 0.25. We also identify eight doubles for which the sources of external and internal shear are more reliably separated, and should therefore be prioritized in monitoring campaigns aimed at measuring time-delays in order to infer the Hubble constant.

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The Nuclear to Host Galaxy Relation of High‐Redshift Quasars

Cited by 42 publications

References 50 publications

COSMIC EVOLUTION OF STAR FORMATION IN TYPE-1 QUASAR HOSTS SINCEz= 1

COSMIC EVOLUTION OF STAR FORMATION IN TYPE-1 QUASAR HOSTS SINCEz= 1

Quasar host galaxies in the FORS deep field

Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey

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