Testing the Completeness of the SDSS Colour Selection for Ultramassive, Slowly Spinning Black Holes

Abstract

We investigate the sensitivity of the colour-based quasar selection algorithm of the Sloan Digital Sky Survey to several key physical parameters of supermassive black holes (SMBHs), focusing on BH spin ($a_{\star }$) at the high BH-mass regime ($M_{BH}⩾10^9{M}_{\odot }$). We use a large grid of model spectral energy distribution, assuming geometrically-thin, optically-thick accretion discs, and spanning a wide range of five physical parameters: BH mass $M_{BH}$, BH spin $a_{\star }$, Eddington ratio $L/L_{Edd}$ , redshift $z$, and inclination angle $inc$. Based on the expected fluxes in the SDSS imaging ugriz bands, we find that $\sim 99.8\%$ of our models with $M_{BH}⩽10^{9.5}{M}_{\odot }$ are selected as quasar candidates and thus would have been targeted for spectroscopic follow-up. However, in the extremely high-mass regime, $⩾10^{10}{M}_{\odot }$, we identify a bias against slowly/retrograde spinning SMBHs. The fraction of SEDs that would have been selected as quasar candidates drops below $\sim 50\%$ for $a_{\star }<0$ across $0.5<z<2$. For particularly massive BHs, with $M_{BH}\simeq 3\times 10^{10}{M}_{\odot }$, this rate drops below $\sim 20\%$, and can be yet lower for specific redshifts. We further find that the chances of identifying any hypothetical sources with $M_{BH}=10^{11}{M}_{\odot }$ by colour selection would be extremely low at the level of $\sim 3\%$. Our findings, along with several recent theoretical arguments and empirical findings, demonstrate that the current understanding of the SMBH population at the high-$M_{BH}$, and particularly the low- or retrograde-spinning regime, is highly incomplete.

arXiv comment13 pages, 9 figures, accepted for publication in MNRAS

References in corpus (54)

• The Sloan Digital Sky Survey: Technical Summary
• The Seventh Data Release of the Sloan Digital Sky Survey
• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• A Catalog of Quasar Properties from SDSS DR7
• Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample
• The Sloan Digital Sky Survey Quasar Catalog V. Seventh Data Release
• Observational constraints on growth of massive black holes
• An ultra-luminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30
• Toward the Standard Population Synthesis Model of the X-Ray Background: Evolution of X-Ray Luminosity and Absorption Functions of Active Galactic Nuclei Including Compton-Thick Populations
• Intrinsic disc emission and the Soft X-ray Excess in AGN
• The cosmological evolution of quasar black-hole masses
• Measuring Black Hole Spin using X-ray Reflection Spectroscopy
• On the cosmic evolution of the scaling relations between black holes and their host galaxies: Broad Line AGN in the zCOSMOS survey
• Photometric Response Functions of the SDSS Imager
• The Radiative Efficiency of Accretion Flows in Individual AGN
• Space Telescope and Optical Reverberation Mapping Project. III. Optical Continuum Emission and Broad-Band Time Delays in NGC 5548
• The Evolution of Black Hole Mass and Spin in Active Galactic Nuclei
• B-Mode contamination by synchrotron emission from 3-years WMAP data
• Most Supermassive Black Holes must be Rapidly Rotating
• Black Hole Growth to z = 2 - I: Improved Virial Methods for Measuring M_BH and L/L_Edd
• The Sizes of the X-ray and Optical Emission Regions of RXJ1131-1231
• X-Ray and Optical Flux Ratio Anomalies in Quadruply Lensed Quasars: I. Zooming in on Quasar Emission Regions
• A Combined Optical and X-ray Study of Unobscured Type 1 AGN. I. Optical Spectra and SED Modeling
• The FIRST-2MASS Red Quasar Survey
• The evolution of active galactic nuclei and their spins
• Low redshift AGN in the Hamburg/ESO Survey: II. The active black hole mass function and the distribution function of Eddington ratios
• On the orientation and magnitude of the black hole spin in galactic nuclei
• Active galactic nuclei at z ~ 1.5: I. Spectral energy distribution and accretion discs
• The UV Continuum of Quasars: Models and SDSS Spectral Slopes
• The cosmic growth of the active black hole population at 1<z<2 in zCOSMOS, VVDS and SDSS
• Heavily Reddened Quasars at z~2 in the UKIDSS Large Area Survey: A Transitional Phase in AGN Evolution
• Cold Accretion Disks and Lineless Quasars
• How Big Can a Black Hole Grow?
• The Effects of Disc Winds on the Spectrum and Black Hole Growth Rate of Active Galactic Nuclei
• A new way to measure supermassive black hole spin in accretion disc dominated Active Galaxies
• Can we measure the accretion efficiency of Active Galactic Nuclei?
• Bolometric luminosity black-hole growth time and slim accretion discs in active galactic nuclei
• The Most Massive Active Black-Holes at z~1.5-3.5 Have High Spins and Radiative Efficiencies
• Constraints on the black hole spin in the quasar SDSS J094533.99+100950.1
• Active galactic nuclei at z ~ 1.5: III. Accretion discs and black hole spin
• The Optical, Ultraviolet, and X-ray Structure of the Quasar HE 0435-1223
• Reflection From the Strong Gravity Regime in a z=0.658 Gravitationally Lensed-Quasar
• Is there a maximum mass for black holes in galactic nuclei?
• An ultra-luminous quasar at z=5.363 with a ten billion solar mass black hole and a Metal-Rich DLA at z~5
• Eddington ratios of faint AGN at intermediate redshift: Evidence for a population of half-starved black holes
• The Effect of Planets Beyond the Ice Line on the Accretion of Volatiles by Habitable-Zone Rocky Planets
• A Rapidly Spinning Black Hole Powers the Einstein Cross
• Radiative Efficiency of Disk Accretion in Individual SDSS QSOs
• A Quasar-Galaxy Mixing Diagram: Quasar Spectral Energy Distribution Shapes in the Optical to Near-Infrared
• Constraining the quasar population with the broad-line width distribution
• The hard X-ray spectrum of NGC 1365: scattered light, not black hole spin
• Reaching the Peak of the Quasar Spectral Energy Distribution I: Observations and Models
• A transition mass for black holes to show broad emission lines

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• Bolometric correction factors for Active Galactic Nuclei
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• Stringent constraints on the light boson model with supermassive black hole spin measurements
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