2-6 September 2024
CJD Bonn Castell
Europe/Berlin timezone
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Contribution

CJD Bonn Castell

Event Horizon and Environs (ETHER) Sample: VLBA Imaging of 11 more Supermassive Black Holes

Speakers

  • Dr. Dhanya G. NAIR

Primary authors

Content

In this talk, we will first present the Event Horizon and Environs (ETHER) sample compiled with an extensive sample of black hole masses and radio-to-sub-mm fluxes to select and enhance targets for Event Horizon Telescope (EHT) and next-generation Event Horizon Telescope (ngEHT). Currently, the ETHER database consists of ~3.8 million supermassive black hole (SMBH) mass estimates, ~19.3K VLBI radio fluxes, and ~14K hard X-ray fluxes. We will also present the results from an extensive 1 mm survey of 236 large-ring supermassive black holes selected from the ETHER sample with black hole ring size > 3.0 micro-arcsec using the Atacama Compact Array (ACA) and Submillimeter Array (SMA) conducted in 2022-23. The constrained 1 mm fluxes obtained from this survey are a timely requirement to drive the technical requirements of the ngEHT.

In this talk, we will also discuss the 43 GHz VLBA observations and imaging results of a sub-sample of 11 supermassive black holes' with ring size > 3 micro-arcsec selected from the ETHER sample (which can be imaged with the EHT on a scale better than 100 gravitational radii). Constraining the 43 GHz nuclear fluxes and morphology of these 11 ETHER targets will enable future deep imaging of this optimal sub-sample with GMVA+ALMA, and EHT+ALMA, thus constraining General Relativity and the physics of jet launching and accretion inflows, over a large multi-parameter space. We will also present preliminary results of our GMVA+ALMA deep observations of the largest ring sources in the ETHER sample: Messier 84, and NGC5077; and the snapshot GMVA+ALMA observations of five SMBHs, which will all offer a unique opportunity to resolve and image accretion inflows and jets at less than 100 gravitational radii resolution in a sample of nearby low luminosity AGNs.