Precision near-IR spectroscopy for understanding AGN physics and shed light on the H0 tension -- SHARP Science Book

Abstract

The persistent tension between early- and late-Universe measurements of the Hubble constant (H0) remains on of the most significant challenges in modern cosmology. The Spectroastrometry and Reverberation Mapping (SARM) method offers a promising, calibration-independent approach to address this issue by combining time-delay measurements of the Broad-Line Region (BLR) with interferometric angular size determinations. Current implementations of SARM, however, are limited by the difficulty of performing near-infrared reverberation mapping (RM) on the same emission lines observed by GRAVITY, restricting applications to only a few bright AGN. We propose using the capabilities of SHARP, the next-generation near-infrared spectrograph for the Extremely Large Telescope (ELT), to overcome these limitations. SHARP's sensitivity and multi-object spectroscopy will enable (1) efficient long-term monitoring of existing GRAVITY targets with minimal time investment, and (2) systematic RM campaigns for the fainter AGN that will be observed by GRAVITY+. These advances will give us precise infrared lags for tens of AGN, enabling geometric distance measurements and a robust, calibration-free determination of H0. Beyond cosmology, SHARP will allow detailed studies of BLR structure and kinematics in the infrared, advancing our understanding of AGN physics and with repercussion on the measurements of Supermassive Black Holes (SMBH) masses.

Accepted for publication in the New Astronomy Special issue SHARP Science Book

References in corpus (38)

• The Demography of Massive Dark Objects in Galaxy Centres
• In the Realm of the Hubble tension $-$ a Review of Solutions
• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• A Catalog of Quasar Properties from SDSS DR7
• The Low-Luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
• The Relationship Between Luminosity and Broad-Line Region Size in Active Galactic Nuclei
• Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei: I. Comparing the Photoionization and Reverberation Techniques
• Supermassive Black Holes in Active Galactic Nuclei. II. Calibration of the M-sigma Relationship for AGNs
• The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters
• First Light for GRAVITY: Phase Referencing Optical Interferometry for the Very Large Telescope Interferometer
• Black Hole Mass Estimates from Reverberation Mapping and from Spatially Resolved Kinematics
• Determining Central Black Hole Masses in Distant Active Galaxies
• The Megamaser Cosmology Project. XIII. Combined Hubble constant constraints
• Measurements of the E-Mode Polarization and Temperature-E-Mode Correlation of the CMB from SPT-3G 2018 Data
• Spatially resolved rotation of the broad-line region of a quasar at sub-parsec scale
• The Structure of the Broad Line Region in AGN: I. Reconstructed Velocity-Delay Maps
• The Relation between Black Hole Mass and Host Spheroid Stellar Mass out to z~2
• Space Telescope and Optical Reverberation Mapping Project. I. Ultraviolet Observations of the Seyfert 1 Galaxy NGC 5548 with the Cosmic Origins Spectrograph on Hubble Space Telescope
• The Luminosity-Size and Mass-Size Relations of Galaxies out to z~3
• Geometric and Dynamical Models of Reverberation Mapping Data
• The Lick AGN Monitoring Project: Recalibrating Single-Epoch Virial Black Hole Mass Estimates
• The Lick AGN Monitoring Project: Velocity-Delay Maps from the Maximum-Entropy Method for Arp 151
• Cosmic Evolution of Black Holes and Spheroids. IV. The BH Mass - Spheroid Luminosity Relation
• The Sloan Digital Sky Survey Reverberation Mapping Project: Estimating Masses of Black Holes in Quasars with Single-Epoch Spectroscopy
• Kinematics of the Broad-line Region of 3C 273 from a Ten-year Reverberation Mapping Campaign
• The Lick AGN Monitoring Project 2011: Dynamical Modeling of the Broad-Line Region
• The Mass of the Black Hole in Arp 151 from Bayesian Modeling of Reverberation Mapping Data
• A parallax distance to 3C 273 through spectroastrometry and reverberation mapping
• Space Telescope and Optical Reverberation Mapping Project. XII. Broad-Line Region Modeling of NGC 5548
• TDCOSMO 2025: Cosmological constraints from strong lensing time delays
• The Lick AGN Monitoring Project 2016: Dynamical Modeling of Velocity-Resolved H\b{eta} Lags in Luminous Seyfert Galaxies
• The black hole mass of the $z=2.805$ multiply imaged quasar SDSS J2222+2745 from velocity-resolved time lags of the CIV emission line
• What Does the Virial Coefficient of the \Hb Broad-Line Region Depend On?
• Spatially resolved broad line region in a quasar at z=4: Dynamical black hole mass and prominent outflow
• Geometric Distances of Quasars Measured by Spectroastrometry and Reverberation Mapping:Monte Carlo Simulations
• Spectroastrometry and Reverberation Mapping of Active Galactic Nuclei. II. Measuring Geometric Distances and Black Hole Masses of Four Nearby Quasars
• The Host Galaxies of Active Galactic Nuclei with Direct Black Hole Mass Measurements