VLT/ISAAC spectra of the H<i>β</i>region in intermediate-redshift quasars

Sulentic, J. W.; Repetto, P.; Stirpe, G. M.; Marziani, Paola; Dultzin‐Hacyan, D.; Calvani, M.

doi:10.1051/0004-6361:20054153

Cited by 74 publications

(119 citation statements)

References 74 publications

(88 reference statements)

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“…19 at an optical redshift of z opt = 2.3192 ± 0.0007 Sulentic et al 2006). It is lensed by a galaxy at z G = 0.729 ± 0.001 (Lidman et al 2000).…”

Section: He 1104−1805 331 Previous Resultsmentioning

confidence: 99%

MOLECULAR GAS IN LENSEDz>2 QUASAR HOST GALAXIES AND THE STAR FORMATION LAW FOR GALAXIES WITH LUMINOUS ACTIVE GALACTIC NUCLEI

Riechers¹

2011

ApJ

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We report the detection of luminous CO(J = 2→1), CO(J = 3→2), and CO(J = 4→3) emission in the strongly lensed high-redshift quasars B1938+666 (z = 2.059), HE 0230−2130 (z = 2.166), HE 1104−1805 (z = 2.322), and B1359+154 (z = 3.240), using the Combined Array for Research in Millimeter-wave Astronomy. B1938+666 was identified in a "blind" CO redshift search, demonstrating the feasibility of such investigations with millimeter interferometers. These galaxies are lensing-amplified by factors of μ L 11-170, and thus allow us to probe the molecular gas in intrinsically fainter galaxies than currently possible without the aid of gravitational lensing. We report lensing-corrected intrinsic CO line luminosities of L CO = 0.65-21×10 9 K km s −1 pc 2 , translating to H 2 masses of M(H 2 ) = 0.52-17 × 10 9 (α CO /0.8) M . To investigate whether or not the active galactic nucleus (AGN) in luminous quasars substantially contributes to L FIR , we study the L CO -L FIR relation for quasars relative to galaxies without a luminous AGN as a function of redshift. We find no substantial differences between submillimeter galaxies and high-z quasars, but marginal evidence for an excess in L FIR in nearby low-L FIR AGN galaxies. This may suggest that an AGN contribution to L FIR is significant in systems with relatively low gas and dust content, but only minor in the most far-infrared-luminous galaxies (in which L FIR is dominated by star formation).

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“…19 at an optical redshift of z opt = 2.3192 ± 0.0007 Sulentic et al 2006). It is lensed by a galaxy at z G = 0.729 ± 0.001 (Lidman et al 2000).…”

Section: He 1104−1805 331 Previous Resultsmentioning

confidence: 99%

MOLECULAR GAS IN LENSEDz>2 QUASAR HOST GALAXIES AND THE STAR FORMATION LAW FOR GALAXIES WITH LUMINOUS ACTIVE GALACTIC NUCLEI

Riechers¹

2011

ApJ

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“…UV intermediate emission lines -but not an HIL like Civλ1549! [118,84] -have been found suitable as well [81], at least for low-z quasars.…”

Section: Black Hole Mass and Eddington Ratio Computationsmentioning

confidence: 90%

Low- and High-zHighly Accreting Quasars in the 4D Eigenvector 1 Context

Marziani¹,

Sulentic²,

Negrete³

et al. 2014

Astronomical Review

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Highly accreting quasars are characterized by distinguishing properties in the 4D eigenvector 1 parameter space that make them easily recognizable over a broad range range of redshift and luminosity. The 4D eigenvector 1 approach allows us to define selection criteria that go beyond the restriction to Narrow Line Seyfert 1s identified at low redshift. These criteria are probably able to isolate sources with a defined physical structure i.e., a geometrically thick, optically thick advectiondominated accretion disk (a "slim" disk). We stress that the importance of highly accreting quasars goes beyond the understanding of the details of their physics: their Eddington ratio is expected to saturate toward values of order unity, making them possible cosmological probes.

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“…The width of broad hβ (FWHM or 2nd profile moment σ) have been widely used as measures of velocity dispersion in the line-emitting gas (see e.g. Peterson et al 2004;Sulentic et al 2006;, allowing what are thought to be the most reliable estimates of black hole mass in low z quasars. This approach has motivated us to seek similar measures in sources with the highest possible redshift rather than using other lines as hβ surrogates.…”

Section: Introductionmentioning

confidence: 99%

VLT/ISAAC spectra of the Hβ region in intermediate-redshift quasars

Marziani¹,

Sulentic²,

Stirpe³

et al. 2009

A&A

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105

187

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Aims. We present new VLT ISAAC spectra for 30 quasars, which we combine with previous data to yield a sample of 53 intermediateredshift (z ≈ 0.9-3.0) sources. The sample is used to explore properties of prominent lines in the hβ spectral region of these very luminous quasars. Methods. We compare this data with two large low-redshift (z < 0.8) samples in a search for trends over almost 6dex in source luminosity.Results. We find two major trends: (1) a systematic increase in minimum FWHM hβ with luminosity (discussed in a previous paper).This lower FWHM envelope is best fit by assuming that the narrowest sources radiate near the Eddington limit, show line emission from a virialized cloud distribution, and obey a well-defined broad line region size vs. luminosity relation. (2) A systematic decrease in equivalent width of [oiii]λλ4959, 5007 (from W ≈ 15 to ∼1 Å) with increasing source bolometric luminosity (from log L bol ≈ 43 to log L bol ≈ 49). Other identified trends require differntiating between so-called Population A and Bsources. We generate median composite spectra in six luminosity bins to maximize S /N. Population A sources show reasonably symmetric Lorentzian hβ profiles at all luminosities, while Pop. B sources require two component fits involving an unshifted broad and a redshifted very broad component.Very broad hβ increases in strength with increasing log L bol , while the broad component remains constant, resulting in an apparent "Baldwin effect" with equivalent width decreasing from W ∼ 80 to ∼20 Å over our sample luminosity range. The roughly constant equivalent width shown by the hβ very broad component implies production in optically-thick, photoionized gas. The onset of the redshifted very broad component appears to be a critical change that occurs near the Pop. A-B boundary at FWHM hβ ≈ 4000 km s −1 , which we relate to a critical Eddington ratio (≈0.2 ± 0.1).

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VLT/ISAAC spectra of the Hβregion in intermediate-redshift quasars

Cited by 74 publications

References 74 publications

MOLECULAR GAS IN LENSEDz>2 QUASAR HOST GALAXIES AND THE STAR FORMATION LAW FOR GALAXIES WITH LUMINOUS ACTIVE GALACTIC NUCLEI

MOLECULAR GAS IN LENSEDz>2 QUASAR HOST GALAXIES AND THE STAR FORMATION LAW FOR GALAXIES WITH LUMINOUS ACTIVE GALACTIC NUCLEI

Low- and High-zHighly Accreting Quasars in the 4D Eigenvector 1 Context

VLT/ISAAC spectra of the Hβ region in intermediate-redshift quasars

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