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# EHT Sagittarius A* Polarized Data | ||
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**Authors:** The Event Horizon Telescope Collaboration et al. | ||
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**Date:** March 27, 2024 | ||
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**Primary Reference:** [The Event Horizon Telescope Collaboration, et al. 2024b, ApJL, 964, L25 (Sgr A* Paper VII)](https://doi.org/10.3847/2041-8213/ad2df0) | ||
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**Data Product Code:** [2024-D02-01](https://eventhorizontelescope.org/for-astronomers/data) | ||
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**Brief Description:** | ||
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We release a calibrated polarimetric data set to accompany tthe First SgrA* Event | ||
Horizon Telescope Polarization Results paper series (EHT Collaboration et al. 2024b,c). | ||
The data set is derived from the Rev7 Correlation of the Event Horizon Telescope (EHT)'s | ||
April 2017 observation campaign (EHT Collaboration et al. 2019c), with further processing | ||
and science validation as described in EHT Collaboration et al. 2022b. | ||
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This data set contains Sagittarius A* (Sgr A*) data for both low and high bands for | ||
two observed days (April 6th and 7th, 2017). This release includes the fringe fitted, | ||
a-priori calibrated, and network calibrated data from both the EHT-HOPS and rPICARD (CASA) | ||
pipelines, which are used in the First Sgr A* EHT results, with the addition of absolute | ||
EVPA calibration from ALMA, parallactic angle rotation, and D-term calibration using the | ||
M87-derived leakage solutions (EHT Collaboration et al. 2021a). Independent flux calibration | ||
is performed based on estimated station sensitvities during the campaign (Issaoun et al. 2017, | ||
Janssen et al. 2019, Wielgus et al. 2022). Data were further calibrated to apply polarimetric | ||
gains to remove R-L gain offsets, amplitude gains obtained from calibrators, amplitude gains | ||
on LMT for its rapid gain fluctuations, and phase gains on JCMT for its residual phase | ||
fluctuations. A description of the data properties, their validation, and estimated systematic | ||
errors is given in M87 Paper III and Sgr A* Paper II and Paper III with additional details in | ||
Wielgus et al. (2019) and Wielgus et al. (2022). The data are time averaged to 10 seconds and | ||
frequency averaged over all 32 intermediate frequencies (IFs). The R/L complex gains have been | ||
calibrated assuming the intrinsic Stokes V visibilities are zero. | ||
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**File Name Convention:** | ||
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The data files are named in the following convention: | ||
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[Data-Release-Tag]_[Source]_[year]_[day-of-year]_[band]_[pipeline]_[stages].[format] | ||
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**Station Code Table:** | ||
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| UVFITS Code | Station Name | Location | | ||
| ----------- | ----------------------------- | ---------- | | ||
| AA | ALMA | Chile | | ||
| AP | APEX | Chile | | ||
| AZ | Submillimeter Telescope | Arizona | | ||
| JC | James Clerk Maxwell Telescope | Hawai'i | | ||
| LM | Large Millimeter Telescope | Mexico | | ||
| PV | IRAM | Spain | | ||
| SM | Submillimeter Array | Hawai'i | | ||
| SP | South Pole Telescope | Antarctica | | ||
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**References:** | ||
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- [EHT Collaboration Data Portal Website](https://eventhorizontelescope.org/for-astronomers/data) | ||
- [The Event Horizon Telescope Collaboration, et al. 2019a, ApJL, 875, L1 (M87 Paper I)](https://doi.org/10.3847/2041-8213/ab0ec7) | ||
- [The Event Horizon Telescope Collaboration, et al. 2019b, ApJL, 875, L2 (M87 Paper II)](https://doi.org/10.3847/2041-8213/ab0c96) | ||
- [The Event Horizon Telescope Collaboration, et al. 2019c, ApJL, 875, L3 (M87 Paper III)](https://doi.org/10.3847/2041-8213/ab0c57) | ||
- [The Event Horizon Telescope Collaboration, et al. 2019d, ApJL, 875, L4 (M87 Paper IV)](https://doi.org/10.3847/2041-8213/ab0e85) | ||
- [The Event Horizon Telescope Collaboration, et al. 2019e, ApJL, 875, L5 (M87 Paper V)](https://doi.org/10.3847/2041-8213/ab0f43) | ||
- [The Event Horizon Telescope Collaboration, et al. 2019f, ApJL, 875, L6 (M87 Paper VI)](https://doi.org/10.3847/2041-8213/ab1141) | ||
- [The Event Horizon Telescope Collaboration, et al. 2021a, ApJL, 910, L12 (M87 Paper VII)](https://doi.org/10.3847/2041-8213/abe71d) | ||
- [The Event Horizon Telescope Collaboration, et al. 2021b, ApJL, 910, L13 (M87 Paper VIII)](https://doi.org/10.3847/2041-8213/abe4de) | ||
- [The Event Horizon Telescope Collaboration, et al. 2023, ApJL, 957, L20 (M87 Paper IX)](https://doi.org/10.3847/2041-8213/acff70) | ||
- [Blackburn, L., Chan, C.-k., Crew, G., et al. 2019, ApJ, 882, 23](https://doi.org/10.3847/1538-4357/ab328d) | ||
- [Janssen, M., Goddi, C., van Bemmel, I., et al. 2019, A&A, 626A, 75](https://doi.org/10.1051/0004-6361/201935181) | ||
- [Issaoun, S., Folkers, T., Blackburn, L., et al. 2017, EHT Memo 2017-CE-02](https://eventhorizontelescope.org/for-astronomers/memos) | ||
- [Janssen, M., Blackburn, L., Issaoun, S., et al. 2019, EHT Memo 2019-CE-01](https://eventhorizontelescope.org/for-astronomers/memos) | ||
- [Wielgus, M., Blackburn, L., Issaoun, S., et al. 2019, EHT Memo 2019-CE-02](https://eventhorizontelescope.org/for-astronomers/memos) | ||
- [The Event Horizon Telescope Collaboration, et al. 2022a, ApJL, 930, L12 (Sgr A* Paper I)](https://doi.org/10.3847/2041-8213/ac6674) | ||
- [The Event Horizon Telescope Collaboration, et al. 2022b, ApJL, 930, L13 (Sgr A* Paper II)](https://doi.org/10.3847/2041-8213/ac6675) | ||
- [The Event Horizon Telescope Collaboration, et al. 2022c, ApJL, 930, L14 (Sgr A* Paper III)](https://doi.org/10.3847/2041-8213/ac6429) | ||
- [The Event Horizon Telescope Collaboration, et al. 2022d, ApJL, 930, L15 (Sgr A* Paper IV)](https://doi.org/10.3847/2041-8213/ac6736) | ||
- [The Event Horizon Telescope Collaboration, et al. 2022e, ApJL, 930, L16 (Sgr A* Paper V)](https://doi.org/10.3847/2041-8213/ac6672) | ||
- [The Event Horizon Telescope Collaboration, et al. 2022f, ApJL, 930, L17 (Sgr A* Paper VI)](https://doi.org/10.3847/2041-8213/ac6756) | ||
- [The Event Horizon Telescope Collaboration, et al. 2024b, ApJL, 964, L25 (Sgr A* Paper VII)](https://doi.org/10.3847/2041-8213/ad2df0) | ||
- [The Event Horizon Telescope Collaboration, et al. 2024c, ApJL, 964, L26 (Sgr A* Paper VIII)](https://doi.org/10.3847/2041-8213/ad2df1) | ||
- [Wielgus, M., Marchili, N., Marti-Vidal, I., Keating, G.K., Ramakrishnan, V., et al. 2022, ApJL, 930, L19](https://doi.org/10.3847/2041-8213/ac6428) |
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