Event Horizon and Environs (ETHER): A Curated Database for EHT and ngEHT Targets and Science
The next generation Event Horizon Telescope (ngEHT) will observe multiple supermassive black hole (SMBH) candidates down to a few tens of mJy, and profoundly transform our understanding of the local SMBH population. Given the impossibility of large-area high-resolution millimeter surveys, multi-freq...
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| Format: | Article |
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Multidisciplinary Digital Publishing Institute
2023
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| Online Access: | https://hdl.handle.net/1721.1/147602 |
| _version_ | 1826206086086000640 |
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| author | Ramakrishnan, Venkatessh Nagar, Neil Arratia, Vicente Hernández-Yévenes, Joaquín Pesce, Dominic W. Nair, Dhanya G. Bandyopadhyay, Bidisha Medina-Porcile, Catalina Krichbaum, Thomas P. Doeleman, Sheperd Ricarte, Angelo Fish, Vincent L. Blackburn, Lindy Falcke, Heino Bower, Geoffrey Natarajan, Priyamvada |
| author2 | Haystack Observatory |
| author_facet | Haystack Observatory Ramakrishnan, Venkatessh Nagar, Neil Arratia, Vicente Hernández-Yévenes, Joaquín Pesce, Dominic W. Nair, Dhanya G. Bandyopadhyay, Bidisha Medina-Porcile, Catalina Krichbaum, Thomas P. Doeleman, Sheperd Ricarte, Angelo Fish, Vincent L. Blackburn, Lindy Falcke, Heino Bower, Geoffrey Natarajan, Priyamvada |
| author_sort | Ramakrishnan, Venkatessh |
| collection | MIT |
| description | The next generation Event Horizon Telescope (ngEHT) will observe multiple supermassive black hole (SMBH) candidates down to a few tens of mJy, and profoundly transform our understanding of the local SMBH population. Given the impossibility of large-area high-resolution millimeter surveys, multi-frequency spectral energy densities (SEDs), and models are required to both identify source samples tailored to specific science goals, and to predict the feasibility of detection of individual interesting sources. Here, we present the Event Horizon and Environs (ETHER) source and SED model database whose primary use is to enable the selection and optimization of targets for EHT and ngEHT science. The living ETHER database currently consolidates 1.6 million black hole mass estimates, ∼15,500 milliarcsec-scale radio fluxes, ∼14,000 hard X-ray fluxes (expected to grow by factor ≳40 with the eROSITA data release) and SED information as obtained from catalogs and database queries, the literature, and our own new observations. Jet and accretion flow models are fit to individual SEDs in an automated way in order to predict the ngEHT observable fluxes from the jet base and accretion inflow. The database can be filtered by parameters or cross matched to a user source list, with the automated SED fitting models optionally fine tuned by the user. We have identified an initial ngEHT ‘gold sample’ for jet base studies and potentially black hole shadows; this sample will grow significantly in the coming years. While the ngEHT requires and will best exploit the ETHER database, six (eleven) ETHER sources have already been observed (scheduled) with the EHT in 2022 (2023), and the database has wide ranging applications in galaxy and black hole mass evolution studies. |
| first_indexed | 2024-09-23T13:23:52Z |
| format | Article |
| id | mit-1721.1/147602 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T13:23:52Z |
| publishDate | 2023 |
| publisher | Multidisciplinary Digital Publishing Institute |
| record_format | dspace |
| spelling | mit-1721.1/1476022024-01-19T18:52:23Z Event Horizon and Environs (ETHER): A Curated Database for EHT and ngEHT Targets and Science Ramakrishnan, Venkatessh Nagar, Neil Arratia, Vicente Hernández-Yévenes, Joaquín Pesce, Dominic W. Nair, Dhanya G. Bandyopadhyay, Bidisha Medina-Porcile, Catalina Krichbaum, Thomas P. Doeleman, Sheperd Ricarte, Angelo Fish, Vincent L. Blackburn, Lindy Falcke, Heino Bower, Geoffrey Natarajan, Priyamvada Haystack Observatory The next generation Event Horizon Telescope (ngEHT) will observe multiple supermassive black hole (SMBH) candidates down to a few tens of mJy, and profoundly transform our understanding of the local SMBH population. Given the impossibility of large-area high-resolution millimeter surveys, multi-frequency spectral energy densities (SEDs), and models are required to both identify source samples tailored to specific science goals, and to predict the feasibility of detection of individual interesting sources. Here, we present the Event Horizon and Environs (ETHER) source and SED model database whose primary use is to enable the selection and optimization of targets for EHT and ngEHT science. The living ETHER database currently consolidates 1.6 million black hole mass estimates, ∼15,500 milliarcsec-scale radio fluxes, ∼14,000 hard X-ray fluxes (expected to grow by factor ≳40 with the eROSITA data release) and SED information as obtained from catalogs and database queries, the literature, and our own new observations. Jet and accretion flow models are fit to individual SEDs in an automated way in order to predict the ngEHT observable fluxes from the jet base and accretion inflow. The database can be filtered by parameters or cross matched to a user source list, with the automated SED fitting models optionally fine tuned by the user. We have identified an initial ngEHT ‘gold sample’ for jet base studies and potentially black hole shadows; this sample will grow significantly in the coming years. While the ngEHT requires and will best exploit the ETHER database, six (eleven) ETHER sources have already been observed (scheduled) with the EHT in 2022 (2023), and the database has wide ranging applications in galaxy and black hole mass evolution studies. 2023-01-20T15:47:17Z 2023-01-20T15:47:17Z 2023-01-12 2023-01-20T14:23:02Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/147602 Galaxies 11 (1): 15 (2023) PUBLISHER_CC http://dx.doi.org/10.3390/galaxies11010015 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ application/pdf Multidisciplinary Digital Publishing Institute Multidisciplinary Digital Publishing Institute |
| spellingShingle | Ramakrishnan, Venkatessh Nagar, Neil Arratia, Vicente Hernández-Yévenes, Joaquín Pesce, Dominic W. Nair, Dhanya G. Bandyopadhyay, Bidisha Medina-Porcile, Catalina Krichbaum, Thomas P. Doeleman, Sheperd Ricarte, Angelo Fish, Vincent L. Blackburn, Lindy Falcke, Heino Bower, Geoffrey Natarajan, Priyamvada Event Horizon and Environs (ETHER): A Curated Database for EHT and ngEHT Targets and Science |
| title | Event Horizon and Environs (ETHER): A Curated Database for EHT and ngEHT Targets and Science |
| title_full | Event Horizon and Environs (ETHER): A Curated Database for EHT and ngEHT Targets and Science |
| title_fullStr | Event Horizon and Environs (ETHER): A Curated Database for EHT and ngEHT Targets and Science |
| title_full_unstemmed | Event Horizon and Environs (ETHER): A Curated Database for EHT and ngEHT Targets and Science |
| title_short | Event Horizon and Environs (ETHER): A Curated Database for EHT and ngEHT Targets and Science |
| title_sort | event horizon and environs ether a curated database for eht and ngeht targets and science |
| url | https://hdl.handle.net/1721.1/147602 |
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