The rate of extreme coronal line emitting galaxies in the Sloan Digital Sky Survey and their relation to tidal disruption events
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2024
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| author | Callow, Joseph Graur, Or Clark, Peter Palmese, Antonella Aguilar, Jessica Ahlen, Steven BenZvi, Segev Brooks, David Claybaugh, Todd de la Macorra, Axel Doel, Peter Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Lambert, Andrew Landriau, Martin Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Nie, Jundan Poppett, Claire Prada, Francisco Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Silber, Joseph H. Tarlé, Gregory Weaver, Benjamin A. Zhou, Zhimin |
| author_facet | Callow, Joseph Graur, Or Clark, Peter Palmese, Antonella Aguilar, Jessica Ahlen, Steven BenZvi, Segev Brooks, David Claybaugh, Todd de la Macorra, Axel Doel, Peter Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Lambert, Andrew Landriau, Martin Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Nie, Jundan Poppett, Claire Prada, Francisco Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Silber, Joseph H. Tarlé, Gregory Weaver, Benjamin A. Zhou, Zhimin |
| contents | High-ionization iron coronal lines (CLs) are a rare phenomenon observed in galaxy and quasi-stellar object spectra that are thought to be created by high-energy emission from active galactic nuclei and certain types of transients. In cases known as extreme coronal line emitting galaxies (ECLEs), these CLs are strong and fade away on a timescale of years. The most likely progenitors of these variable CLs are tidal disruption events (TDEs), which produce sufficient high-energy emission to create and sustain the CLs over these timescales. To test the possible connection between ECLEs and TDEs, we present the most complete variable ECLE rate calculation to date and compare the results to TDE rates from the literature. To achieve this, we search for ECLEs in the Sloan Digital Sky Survey (SDSS). We detect sufficiently strong CLs in 16 galaxies, more than doubling the number previously found in SDSS. We find that none of the nine new ECLEs evolve in a manner consistent with that of the five previously discovered variable ECLEs. Using this sample of five variable ECLEs, we calculate the galaxy-normalized rate of variable ECLEs in SDSS to be $R_\mathrm{G}=3.6~^{+2.6}_{-1.8}~(\mathrm{statistical})~^{+5.1}_{-0.0} (\mathrm{systematic})\times10^{-6}~\mathrm{galaxy}^{-1}~\mathrm{yr}^{-1}$. The mass-normalised rate is $R_\mathrm{M}=3.1~^{+2.3}_{-1.5}~(\mathrm{statistical})~^{+4.4}_{-0.0}~(\mathrm{systematic})\times10^{-17}~\mathrm{M_\odot^{-1}}~\mathrm{yr}^{-1}$ and the volumetric rate is $R_\mathrm{V}=7~^{+20}_{-5}~(\mathrm{statistical})~^{+10}_{-0.0}~(\mathrm{systematic})\times10^{-9}~\mathrm{Mpc}^{-3}~\mathrm{yr}^{-1}$. Our rates are one to two orders of magnitude lower than TDE rates from the literature, which suggests that only 10 to 40 per cent of all TDEs produce variable ECLEs. Additional uncertainties in the rates arising from the structure of the interstellar medium have yet to be included. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_16951 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The rate of extreme coronal line emitting galaxies in the Sloan Digital Sky Survey and their relation to tidal disruption events Callow, Joseph Graur, Or Clark, Peter Palmese, Antonella Aguilar, Jessica Ahlen, Steven BenZvi, Segev Brooks, David Claybaugh, Todd de la Macorra, Axel Doel, Peter Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Lambert, Andrew Landriau, Martin Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Nie, Jundan Poppett, Claire Prada, Francisco Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Silber, Joseph H. Tarlé, Gregory Weaver, Benjamin A. Zhou, Zhimin High Energy Astrophysical Phenomena Astrophysics of Galaxies High-ionization iron coronal lines (CLs) are a rare phenomenon observed in galaxy and quasi-stellar object spectra that are thought to be created by high-energy emission from active galactic nuclei and certain types of transients. In cases known as extreme coronal line emitting galaxies (ECLEs), these CLs are strong and fade away on a timescale of years. The most likely progenitors of these variable CLs are tidal disruption events (TDEs), which produce sufficient high-energy emission to create and sustain the CLs over these timescales. To test the possible connection between ECLEs and TDEs, we present the most complete variable ECLE rate calculation to date and compare the results to TDE rates from the literature. To achieve this, we search for ECLEs in the Sloan Digital Sky Survey (SDSS). We detect sufficiently strong CLs in 16 galaxies, more than doubling the number previously found in SDSS. We find that none of the nine new ECLEs evolve in a manner consistent with that of the five previously discovered variable ECLEs. Using this sample of five variable ECLEs, we calculate the galaxy-normalized rate of variable ECLEs in SDSS to be $R_\mathrm{G}=3.6~^{+2.6}_{-1.8}~(\mathrm{statistical})~^{+5.1}_{-0.0} (\mathrm{systematic})\times10^{-6}~\mathrm{galaxy}^{-1}~\mathrm{yr}^{-1}$. The mass-normalised rate is $R_\mathrm{M}=3.1~^{+2.3}_{-1.5}~(\mathrm{statistical})~^{+4.4}_{-0.0}~(\mathrm{systematic})\times10^{-17}~\mathrm{M_\odot^{-1}}~\mathrm{yr}^{-1}$ and the volumetric rate is $R_\mathrm{V}=7~^{+20}_{-5}~(\mathrm{statistical})~^{+10}_{-0.0}~(\mathrm{systematic})\times10^{-9}~\mathrm{Mpc}^{-3}~\mathrm{yr}^{-1}$. Our rates are one to two orders of magnitude lower than TDE rates from the literature, which suggests that only 10 to 40 per cent of all TDEs produce variable ECLEs. Additional uncertainties in the rates arising from the structure of the interstellar medium have yet to be included. |
| title | The rate of extreme coronal line emitting galaxies in the Sloan Digital Sky Survey and their relation to tidal disruption events |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2402.16951 |