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‎DP1/300_Science_Demos/307_AGN/307_1_AGN_Light_Curves.ipynb‎

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{
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"cell_type": "markdown",
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"id": "c30ab333-d5e6-460d-b1cc-16ffc1df3835",
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"metadata": {},
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"source": [
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"**Learning objective:** Retrieve photometry and plot a light curve for an Active Galactic Nucleus from DP1."
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]
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},
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{
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"cell_type": "markdown",
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"id": "96bc973d-d47f-432b-a85e-4a3cdabe7dcf",
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"metadata": {},
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"source": [
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"**LSST data products:** `ForcedSourceOnDiaObject`, `Visit`, `Object`"
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]
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{
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"cell_type": "markdown",
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"id": "2812d90f-198b-4b08-b6bb-738f340eeb1e",
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"metadata": {},
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"source": [
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"**Credit:** Originally developed by the Rubin Community Science team.\n",
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"Please consider acknowledging them if this notebook is used for the preparation of journal articles, software releases, or other notebooks."
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"metadata": {},
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"source": [
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"Related tutorials: The 200-level tutorials on difference image analysis (DIA) catalogs."
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]
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{
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"id": "cdb44e53-a5d8-4a37-a125-465de8f7f234",
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"metadata": {},
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"source": [
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"Obtain light curve data from the `ForcedSourceOnDiaObject` table, which contains forced PSF photometry for *all* difference images as well as direct images (`visit_images`). The relevant table columns for plotting light curves are:\n",
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"\n",
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{
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"id": "71a85470-ec04-4e9f-b045-13987e00a96c",
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"metadata": {},
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"Uncomment to display the table results."
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{
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"id": "021826b8-f252-44f3-bc05-57ce376febf2",
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"metadata": {},
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"source": [
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"> **Figure 2:** Forced PSF photometry at the location of a known AGN from the `ForcedSourceOnDiaObject` table. The top panel shows the light curves for the six LSST filters $ugrizy$, using the difference image PSF flux vs. time. The bottom panel shows the light curve using the direct image PSF flux vs. time."
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{
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"id": "1d7435cb-d73a-4f43-ac14-0ed0b472c396",
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"metadata": {},
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"source": [
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"Convert the direct image PSF fluxes to magnitudes."
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{
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"id": "e59fa795-2ee7-4f2a-a994-859786b2d97f",
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"metadata": {},
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"source": [
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"> **Figure 3:** The light curve is shown as PSF magnitude vs. time, with the PSF flux from direct images converted to magnitudes."
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{
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"cell_type": "markdown",
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"id": "f3edcfe0-91aa-4882-96cb-6da5934cfb38",
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"metadata": {},
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"source": [
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"### 4.1 Query the `Object` table"
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{
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"cell_type": "markdown",
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"id": "97c15869-9d3d-4776-935c-0b43c3471086",
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"metadata": {},
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"source": [
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"Run the query and store the results in an Astropy table."
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{
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"cell_type": "markdown",
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"id": "6091a0aa-5744-4fab-ab72-143fdac27feb",
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"execution": {
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"metadata": {},
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"source": [
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"> **Figure 4:** The observed SED for the object at the location of the AGN, which is brightest in the $g$-band. The SED is shown in the observed frame with no corrections for the redshift of the AGN (z = 0.734)."
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]

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