Exploring Supermassive Black Hole Growth with ALMA

Abstract

Massive tori with $\approx 10^{8-9}{M}_{\odot }$ are predicted to extend on $\sim$100 pc scale around the centre of elliptical galaxy progenitors by a model of a supermassive black hole (SMBH) growth coeval to the spheroidal population of the host galaxy. Direct detection of such massive tori would cast light on a key physical condition that allows the rapid growth of SMBHs and the appearance of QSOs at high redshift. For this reason, we examine the detectability of such structures at substantial redshift with the Atacama Large Millimeter Array (ALMA). We propose that submillimeter galaxies (SMGs) are the best targets to test our predictions. In order to assess the observational feasibility, we estimate the expected number counts of SMGs with massive tori and check the detectability with the ALMA instrument, the unique facility which can resolve the central region of high redshift objects. Our work shows that ALMA will be able to resolve and detect high-$J$ ($J>$ 4) CO emissions from $\sim$100 pc scale extended massive tori up to $z\approx 2$. Observations of lensed SMGs will yield excellent spatial resolution, allowing even to resolve their massive tori at higher redshift. We discuss further the detectability of the HCN molecule, as a better tracer of the high density gas expected in such tori. The final goal of these kind of observations is to pinpoint possible physical mechanisms that storage in the very central galactic regions very large amount gas on timescale of several 10${}^8$ yr.

22 pages, 5 figures, accepted for publication in ApJ

References in corpus (8)

• The Star-Forming Torus and Stellar Dynamical Black Hole Mass in the Seyfert 1 Nucleus of NGC3227
• Quasar Luminosity Functions from Joint Evolution of Black Holes and Host Galaxies
• A mid-infrared spectroscopic study of submillimeter galaxies: luminous starbursts at high redshift
• HCN Observations of Dense Star-Forming Gas in High Redshift Galaxies
• Mid-Infrared Spectroscopy of High Redshift Submillimeter Galaxies: First Results
• The growth of the nuclear black holes in submillimeter galaxies
• Millimeter Interferometric Investigations of the Energy Sources of Three Ultraluminous Infrared Galaxies, UGC 5101, Mrk 273, and IRAS 17208-0014, based on HCN to HCO+ Ratios
• Anti-correlation between the mass of a supermassive black hole and the mass accretion rate in type I ultraluminous infrared galaxies and nearby QSOs

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• The Coevolution of Supermassive Black Holes and Massive Galaxies at High Redshift
• Coevolution of Supermassive Black Holes and Circumnuclear Disks
• On the Detection of High Redshift Black Holes with ALMA through CO and H2 Emission
• Submillimeter Array Identification of the Millimeter-Selected Galaxy SSA22-AzTEC1: A Protoquasar in a Protocluster?
• Chandra and ALMA observations of the nuclear activity in two strongly lensed star forming galaxies
• Prospects for AGN studies with ALMA