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| Main Authors: | , , |
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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2407.05508 |
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| _version_ | 1866917859241754624 |
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| author | Pai, Aashay Blanton, Michael R. Moustakas, John |
| author_facet | Pai, Aashay Blanton, Michael R. Moustakas, John |
| contents | We use mid-infrared variability in galaxies to search for active galactic nuclei (AGN) in the local universe. We use a sample of 10,220 galaxies from the Mapping Nearby Galaxies at APO (MaNGA) survey, part of the Sloan Digital Sky Survey (SDSS-IV). For each galaxy, we examine its mid-infrared variability in the $W2$ $[4.6μm]$ band over thirteen years using data from the Wide Infrared Survey Explorer (WISE) All-Sky and Near Earth Objects WISE (NEOWISE) missions. We demonstrate that we can detect variability signatures as small as about $7\%$ in the root-mean-square variation of $W2$ flux for the majority of cases. Using other AGN signatures of the variable galaxies, such as optical narrow lines, optical broad lines, and WISE $W1-W2$ colors, we show that $\sim 75\%$ of the variables show these additional AGN signatures, indicating that the bulk of these cases are likely to be AGN. We also identify seven galaxies that have light-curves characteristic of tidal disruption events. We present here a publicly available catalog of the light-curve variability in $W2$ of these galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_05508 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Mid-Infrared Variability in Nearby Galaxies from the MaNGA Sample Pai, Aashay Blanton, Michael R. Moustakas, John Astrophysics of Galaxies We use mid-infrared variability in galaxies to search for active galactic nuclei (AGN) in the local universe. We use a sample of 10,220 galaxies from the Mapping Nearby Galaxies at APO (MaNGA) survey, part of the Sloan Digital Sky Survey (SDSS-IV). For each galaxy, we examine its mid-infrared variability in the $W2$ $[4.6μm]$ band over thirteen years using data from the Wide Infrared Survey Explorer (WISE) All-Sky and Near Earth Objects WISE (NEOWISE) missions. We demonstrate that we can detect variability signatures as small as about $7\%$ in the root-mean-square variation of $W2$ flux for the majority of cases. Using other AGN signatures of the variable galaxies, such as optical narrow lines, optical broad lines, and WISE $W1-W2$ colors, we show that $\sim 75\%$ of the variables show these additional AGN signatures, indicating that the bulk of these cases are likely to be AGN. We also identify seven galaxies that have light-curves characteristic of tidal disruption events. We present here a publicly available catalog of the light-curve variability in $W2$ of these galaxies. |
| title | Mid-Infrared Variability in Nearby Galaxies from the MaNGA Sample |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2407.05508 |