The Atacama Cosmology Telescope: Flux Upper Limits from a Targeted Search for Extragalactic Transients
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| Natura: | Preprint |
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2023
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| author | Hervías-Caimapo, Carlos Naess, Sigurd Hincks, Adam D. Calabrese, Erminia Devlin, Mark J. Dunkley, Jo Dünner, Rolando Gallardo, Patricio A. Hilton, Matt Huffenberger, Anna Y. Q. Ho Kevin M. Ma, Xiaoyi Madhavacheril, Mathew S. Niemack, Michael D. Orlowski-Scherer, John Page, Lyman A. Partridge, Bruce Puddu, Roberto Salatino, Maria Sifón, Cristóbal Staggs, Suzanne T. Vargas, Cristian Vavagiakis, Eve M. Wollack, Edward J. |
| author_facet | Hervías-Caimapo, Carlos Naess, Sigurd Hincks, Adam D. Calabrese, Erminia Devlin, Mark J. Dunkley, Jo Dünner, Rolando Gallardo, Patricio A. Hilton, Matt Huffenberger, Anna Y. Q. Ho Kevin M. Ma, Xiaoyi Madhavacheril, Mathew S. Niemack, Michael D. Orlowski-Scherer, John Page, Lyman A. Partridge, Bruce Puddu, Roberto Salatino, Maria Sifón, Cristóbal Staggs, Suzanne T. Vargas, Cristian Vavagiakis, Eve M. Wollack, Edward J. |
| contents | We have performed targeted searches of known extragalactic transient events at millimetre wavelengths using nine seasons (2013--2021) of 98, 150, and 229\,GHz Atacama Cosmology Telescope (ACT) observations that mapped ${\sim}40$ per cent of the sky for most of the data volume. Our data cover 88 gamma-ray bursts (GRBs), 12 tidal disruption events (TDEs) and 203 other transients, including supernovae (SNe). We stack our ACT observations to increase the signal-to-noise ratio of the maps. In all cases but one, we do not detect these transients in the ACT data. The single candidate detection (event AT2019ppm), seen at ${\sim}5σ$ significance in our data, appears to be due to active galactic nuclei (AGN) activity in the host galaxy coincident with a transient alert. For each source in our search we provide flux upper limits. For example, the medians for the 95 per cent confidence upper limits at 98\,GHz are $15$, $18$, and $16$\,mJy for GRBs, SNe, and TDEs respectively, in the first month after discovery. The projected sensitivity of future wide-area cosmic microwave background (CMB) surveys should be sufficient to detect many of these events using the methods described in this paper. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2301_07651 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The Atacama Cosmology Telescope: Flux Upper Limits from a Targeted Search for Extragalactic Transients Hervías-Caimapo, Carlos Naess, Sigurd Hincks, Adam D. Calabrese, Erminia Devlin, Mark J. Dunkley, Jo Dünner, Rolando Gallardo, Patricio A. Hilton, Matt Huffenberger, Anna Y. Q. Ho Kevin M. Ma, Xiaoyi Madhavacheril, Mathew S. Niemack, Michael D. Orlowski-Scherer, John Page, Lyman A. Partridge, Bruce Puddu, Roberto Salatino, Maria Sifón, Cristóbal Staggs, Suzanne T. Vargas, Cristian Vavagiakis, Eve M. Wollack, Edward J. High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics We have performed targeted searches of known extragalactic transient events at millimetre wavelengths using nine seasons (2013--2021) of 98, 150, and 229\,GHz Atacama Cosmology Telescope (ACT) observations that mapped ${\sim}40$ per cent of the sky for most of the data volume. Our data cover 88 gamma-ray bursts (GRBs), 12 tidal disruption events (TDEs) and 203 other transients, including supernovae (SNe). We stack our ACT observations to increase the signal-to-noise ratio of the maps. In all cases but one, we do not detect these transients in the ACT data. The single candidate detection (event AT2019ppm), seen at ${\sim}5σ$ significance in our data, appears to be due to active galactic nuclei (AGN) activity in the host galaxy coincident with a transient alert. For each source in our search we provide flux upper limits. For example, the medians for the 95 per cent confidence upper limits at 98\,GHz are $15$, $18$, and $16$\,mJy for GRBs, SNe, and TDEs respectively, in the first month after discovery. The projected sensitivity of future wide-area cosmic microwave background (CMB) surveys should be sufficient to detect many of these events using the methods described in this paper. |
| title | The Atacama Cosmology Telescope: Flux Upper Limits from a Targeted Search for Extragalactic Transients |
| topic | High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2301.07651 |