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| Hubble Space Telescope/ACS | |
|---|---|
| Name | Hubble Space Telescope/ACS |
| Organization | National Aeronautics and Space Administration; European Space Agency |
| Country | United States; Europe |
| Established | 2002 |
| Wavelength | Ultraviolet; Optical; Near-infrared |
Hubble Space Telescope/ACS The Advanced Camera for Surveys (ACS) is a third-generation imaging instrument installed on the Hubble Space Telescope during the STS-109 mission, providing wide-field, high-resolution imaging across ultraviolet to near-infrared bands and enabling surveys used by teams from institutions such as the Space Telescope Science Institute, European Space Agency, and California Institute of Technology. ACS transformed programs led by investigators affiliated with organizations like National Aeronautics and Space Administration, Johns Hopkins University, and University of California, Berkeley by producing datasets that supported follow-up by facilities including the Keck Observatory, Very Large Telescope, and Chandra X-ray Observatory.
ACS was conceived as a successor to the original Wide Field Planetary Camera 2 to provide enhanced throughput for deep-field imaging and surveys used in cosmological and galactic research, developed through partnerships among Jet Propulsion Laboratory, Ball Aerospace, and industrial contractors collaborating with the Space Telescope Science Institute. Commissioned after a planned servicing mission, ACS operated alongside instruments such as the Cosmic Origins Spectrograph and Wide Field Camera 3, enabling coordinated programs like the Great Observatories Origins Deep Survey and synergy with missions such as Spitzer Space Telescope and Galaxy Evolution Explorer.
ACS comprised multiple channels: the Wide Field Channel (WFC), the High Resolution Channel (HRC), and the Solar Blind Channel (SBC), each featuring dedicated detector technology and optical assemblies derived from designs used at facilities like Lawrence Berkeley National Laboratory and fabrication by contractors linked to Ball Aerospace. The WFC used large-format charge-coupled devices similar to those deployed at observatories including Magellan Telescopes and used filters analogous to sets used at Subaru Telescope, while the HRC offered fine sampling comparable to instruments at Keck Observatory and the SBC employed microchannel plates resembling detectors developed for missions like Galileo (spacecraft). ACS incorporated mechanisms for filter wheels, coronagraphic masks, and polarimetric elements influenced by designs at European Southern Observatory instruments.
ACS was designed to address objectives in observational programs including measurement of Type Ia supernova light curves for cosmological parameter estimation pursued by teams at Lawrence Berkeley National Laboratory and SISIS Collaboration, morphological studies of galaxy formation targeted by groups at University of Cambridge and Princeton University, and resolved stellar population analyses in the Local Group undertaken by researchers at University of Washington and Harvard-Smithsonian Center for Astrophysics. Capabilities such as wide-field mosaicking enabled large-scale surveys like the COSMOS project and deep-field observations comparable to campaigns executed by Hubble Deep Field teams, while high dynamic range imaging supported studies of gravitational lensing used by collaborations including the Sloan Digital Sky Survey consortium.
ACS was central to key programs such as the GEMS (Galaxy Evolution from Morphology and SEDs) survey, the Galaxy Evolution Explorer joint studies, and influential results including high-resolution imaging of Comet Shoemaker–Levy 9 impacts analogs, detailed maps of globular cluster systems in galaxies studied by Hubble Heritage Project, and breakthroughs in measurements of the Hubble constant that fed into debates involving teams at Supernova Cosmology Project and High-Z Supernova Search Team. ACS images underpinned discoveries in strong-lensing systems studied alongside data from Subaru Telescope and Atacama Large Millimeter/submillimeter Array, and provided the imaging foundation for stellar photometry programs aligned with the Anglo-Australian Observatory and the European Southern Observatory.
Calibration of ACS relied on standards and cross-calibration observations tied to spectrophotometric references maintained by institutions like National Institute of Standards and Technology and comparison programs involving Wide Field Camera 3 and Space Telescope Imaging Spectrograph. Performance assessments monitored charge transfer efficiency degradation analogous to effects characterized at European Space Agency detector testbeds, and periodic annealing and operational mitigations were developed with engineering teams at Goddard Space Flight Center and Ball Aerospace. Notable upgrades include software and operational modes introduced after servicing missions that paralleled enhancements applied to instruments on missions such as Chandra X-ray Observatory.
ACS operations were scheduled and executed through the Space Telescope Science Institute using proposal cycles similar to the processes at European Southern Observatory and data products were archived in the Mikulski Archive for Space Telescopes where they were accessed by researchers at NASA, ESA, and universities like University of Michigan and Massachusetts Institute of Technology. Data reduction pipelines incorporated algorithms from teams associated with Astrophysical Journal publications and calibration reference files produced by staff with backgrounds at California Institute of Technology and were routinely reprocessed for legacy surveys that supported ancillary observations from facilities such as Gemini Observatory and Palomar Observatory.
ACS left a lasting legacy through contributions to extragalactic astronomy, stellar astrophysics, and cosmology, enabling high-impact publications in journals like Nature (journal) and The Astrophysical Journal authored by scientists at Harvard University, Yale University, and University of Chicago. Its datasets continue to inform follow-up science with next-generation observatories including the James Webb Space Telescope, Nancy Grace Roman Space Telescope, and large ground-based projects like the Vera C. Rubin Observatory, and remain a cornerstone for archival research pursued by consortia such as the Hubble Heritage Project and survey teams from Space Telescope Science Institute.
Category:Instruments on the Hubble Space Telescope