Fundamental Cosmological Observations and Data Interpretation

Bartelmann, Matthias; Bennett, C. L.; Burigana, C.; Chiosi, C.; D’Onofrio, M.; Dressler, Alan; Gioia, I. M.; Hasinger, G.; Macías-Pérez, J. F.; Madau, Piero; Marziani, Paola; Mather, John C.; Matteuccí, F.; Olive, Keith A.; Peacock, J. A.; Reich, W.; Robitaille, Pierre‐Marie; Rowan-Robinson, M.; Steigman, Gary; Steinmetz, Matthias; Sulentic, J. W.; Turatto, M.; White, Simon D. M.

doi:10.1007/978-3-642-00792-7_2

Cited by 5 publications

(3 citation statements)

References 483 publications

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“…One can predict the apparent magnitude of a quasar with "maximum" mass and radiating at Eddington limit and derive some constraint on the distance scale. If this computation is carried out (Bartelmann et al, 2009), one derives H 0 values that are in agreement with present-day estimates (≈ 60-70 km s −1 Mpc −1 ). Clearly we are a far cry from the original Hubble estimate of 500 km s −1 Mpc −1 (Hubble, 1929).…”

Section: Introductionsupporting

confidence: 80%

Quasars and their emission lines as cosmological probes

Marziani¹,

Sulentic²

2014

Advances in Space Research

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Quasars are the most luminous sources in the Universe. They are currently observed out to redshift z ~ 7 when the Universe was less than one tenth of its present age. Since their discovery 50 years ago astronomers have dreamed of using them as standard candles. Unfortunately quasars cover a very large range (8 dex) of luminosity making them far from standard. We briefly review several methods that can potentially exploit quasars properties and allow us to obtain useful constraints on principal cosmological parameters. Using our 4D Eigenvector 1 formalism we have found a way to effectively isolate quasars radiating near the Eddington limit. If the Eddington ratio is known, under several assumptions it is possible to derive distance independent luminosities. We discuss and the main statistical and systematic errors involved, and whether these "standard Eddington candles" can be actually used to constrain cosmological models.Comment: Accepted for publication in Advances in Space Research. Invited talk presented at the 9th Serbian Conference on Spectral Line Shapes in Astrophysics (SCSLSA) held in Banja Koviljaca, Serbia, on May 13-17, 201

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Section: Introductionsupporting

confidence: 80%

Quasars and their emission lines as cosmological probes

Marziani¹,

Sulentic²

2014

Advances in Space Research

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“…Quasars show properties that make them potential cosmological probes [e.g, 69,6]: they are plentiful, very luminous, and are detected at very early cosmic epochs (currently out to redshift 7). However, they have never been successfully exploited as distance indicators in the past decades.…”

Section: Spectral Energy Distributionmentioning

confidence: 99%

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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“…Quasars have a tremendous potential for cosmology, but their potential is as yet unexploited since they are not standard candles in conventional terms. Early efforts to establish correlations between luminosity and one or more parameters (for example, the equivalent width of high-ionization lines, the so-called Baldwin effects, Baldwin et al 1978) did not live up to cosmological expectations (some early and some recent attempts are reviewed in the Chapter by Bartelmann et al 2009 in D'Onofrio and. Nonetheless, in the last few years several methods have been proposed for the use of quasars as redshiftindependent distance indicators, or as standard rulers.…”

Section: Quasars and Observational Cosmologymentioning

confidence: 99%

A Multimessenger View of Galaxies and Quasars From Now to Mid-century

D’Onofrio

Marziani

2018

Front. Astron. Space Sci.

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In the next 30 years, a new generation of space and ground-based telescopes will permit to obtain multi-frequency observations of faint sources and, for the first time in human history, to achieve a deep, almost synoptical monitoring of the whole sky. Gravitational wave observatories will detect a Universe of unseen black holes in the merging process over a broad spectrum of mass. Computing facilities will permit new high-resolution simulations with a deeper physical analysis of the main phenomena occurring at different scales.Given these development lines, we first sketch a panorama of the main instrumental developments expected in the next thirty years, dealing not only with electromagnetic radiation, but also from a multi-messenger perspective that includes gravitational waves, neutrinos, and cosmic rays. We then present how the new instrumentation will make it possible to foster advances in our present understanding of galaxies and quasars. We focus on selected scientific themes that are hotly debated today, in some cases advancing conjectures on the solution of major problems that may become solved in the next 30 years.

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Fundamental Cosmological Observations and Data Interpretation

Cited by 5 publications

References 483 publications

Quasars and their emission lines as cosmological probes

Quasars and their emission lines as cosmological probes

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

A Multimessenger View of Galaxies and Quasars From Now to Mid-century

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