High-quality Extragalactic Legacy-field Monitoring (HELM) with DECam
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- Illinois U., Urbana (main)
- Harvard-Smithsonian Ctr. Astrophys.; Illinois U., Urbana (main)
- Illinois U., Urbana (main); Illinois U., Urbana, Astron. Dept.
- NCSA, Urbana
- Illinois U., Urbana, Astron. Dept.
- Illinois U., Urbana (main); Illinois U., Urbana, Astron. Dept.; Illinois U., Urbana
- Ohio State U.; Ohio State U., CCAPP; Ohio State U., Dept. Astron.
- Gemini Observ., La Serena
- Washington U., Seattle, Astron. Dept.
- Diego Portales U.
- Chile U., Catolica; Millenium Inst. Astro., Santiago
- Durham U.
- Penn State U., Astron. Astrophys.; Penn State U.; Penn State U., University Park, IGC
- IAC, La Laguna; Laguna U., Tenerife
- Baltimore, Space Telescope Sci.
- Fermilab; Chicago U., KICP; Chicago U., Astron. Astrophys. Ctr.
- Garching, Max Planck Inst., MPE
- Natl. Solar Observ., Tucson
- U. Chile, Santiago; ITeDA, Buenos Aires; Ulan Bator, Inst. Phys. Tech.
- Wisconsin U., Madison; Arizona U., Astron. Dept. - Steward Observ.
- LLNL, Livermore
- York U., Canada
- Rice U.
- St. Andrews U.
- Potsdam, Astrophys. Inst.
- U. Michigan, Dept. Astron.
- Australian Natl. U., Canberra; ARC, Canberra; Australian Natl. U., Canberra (main)
- Australian Natl. U., Canberra
- Diego Portales U.; Peking U., Beijing, KIAA
- Illinois U., Urbana (main); NCSA, Urbana
- Northern Arizona U.
- Australian Natl. U., Canberra; ARC, Canberra; Australian Natl. U., Canberra (main); Swinburne U. Tech., Hawthorn
- Texas A-M; HARC, Woodlands
- Hefei, CUST
- KIPAC, Menlo Park; Stanford U., HEPL
- Harvard-Smithsonian Ctr. Astrophys.
High-quality Extragalactic Legacy-field Monitoring (HELM) is a long-term observing program that photometrically monitors several well-studied extragalactic legacy fields with the Dark Energy Camera (DECam) imager on the CTIO 4m Blanco telescope. Since Feb 2019, HELM has been monitoring regions within COSMOS, XMM-LSS, CDF-S, S-CVZ, ELAIS-S1, and SDSS Stripe 82 with few-day cadences in the $(u)gri(z)$ bands, over a collective sky area of $$\sim 38$$ deg$${\rm ^2}$$. The main science goal of HELM is to provide high-quality optical light curves for a large sample of active galactic nuclei (AGNs), and to build decades-long time baselines when combining past and future optical light curves in these legacy fields. These optical images and light curves will facilitate the measurements of AGN reverberation mapping lags, as well as studies of AGN variability and its dependences on accretion properties. In addition, the time-resolved and coadded DECam photometry will enable a broad range of science applications from galaxy evolution to time-domain science. We describe the design and implementation of the program and present the first data release that includes source catalogs and the first $$\sim 3.5$$ years of light curves during 2019A--2022A.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 2298982
- Report Number(s):
- FERMILAB-PUB-24-0054-PPD; arXiv:2402.06052; oai:inspirehep.net:2757257
- Journal Information:
- TBD, Journal Name: TBD
- Country of Publication:
- United States
- Language:
- English
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