Characterization and on-orbit performance of the Advanced Camera for Surveys CCDs

Sirianni, M.; Clampin, Mark; Hartig, G.; Ford, H. C.; Illingworth, G. D.; Argabright, Vic S.; Burmester, Bill; Marchi, Guido De; Koldewyn, William; Martel, A. R.; Mutchler, Max; Riess, Adam G.; Schrein, Ronald J.; Sullivan, Pamela C.

doi:10.1117/12.460032

Cited by 6 publications

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“…A large fraction of the hot pixels can be removed by regularly warming the CCDs approximately 100 C above their operating temperature for a period of several (10 to 16) hours. Riess et al 26 and Sirianni et al 16 report that the first two HRC anneals yielded an 80% anneal rate, the same as observed for STIS and WFPC2. However, only 45-50% of the new WFC hot pixels are removed the first time they are annealed.…”

Section: Wfc Dark Current Cte and Radiation Damagesupporting

confidence: 72%

“…Sirianni et al 16 provide a detailed discussion of the performance of the ACS CCDs. We briefly summarize the performance of the three cameras here.…”

Section: Wfc and Hrc Detector On-orbit Performance 221 Wfc And Hrcmentioning

confidence: 99%

“…The number of electrons deposited by cosmic rays has a well-defined lower cutoff of ~500 electrons and a median of ~1000 electrons 25 . Riess et al 26 and Sirianni et al 16 measure the growth of cosmic ray induced hot pixels in the ACS CCDs. The respective WFC and HRC growth rates for hot pixels with greater than 0.04 e/sec are 1200 and 90 per day.…”

Section: Wfc Dark Current Cte and Radiation Damagementioning

confidence: 99%

“…Hartig et al 15 discuss the on-orbit ACS optical alignment and imaging performance. Sirianni et al 16 present the on-orbit characterization and performance of the ACS CCDs. The on-orbit performance of the Solar Blind Channel (SBC) is given by Tran et al 17 .…”

Section: Introductionmentioning

confidence: 99%

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Overview of the Advanced Camera for Surveys on-orbit performance

et al. 2003

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We present an overview of the ACS on-orbit performance based on the calibration observations taken during the first three months of ACS operations. The ACS meets or exceeds all of its important performance specifications. The WFC and HRC FWHM and 50% encircled energy diameters at 555 nm are 0.088′′ and 0.14′′, and 0.050′′ and 0.10′′. The average rms WFC and HRC read noises are 5.0 e − and 4.7 e − . The WFC and HRC average dark currents are ~ 7.5 and ~ 9.1 e − /pixel/hour at their operating temperatures of − 76 °C and − 80 °C. The SBC + HST throughput is 0.0476 and 0.0292 through the F125LP and F150LP filters. The lower than expected SBC operating temperature of 15 to 27 °C gives a dark current of 0.038 e − /pix/hour. The SBC just misses its image specification with an observed 50% encircled energy diameter of 0.24′′ at 121.6 nm. The ACS HRC coronagraph provides a 6 to 16 direct reduction of a stellar PSF, and a ~1000 to ~9000 PSF-subtracted reduction, depending on the size of the coronagraphic spot and the wavelength. The ACS grism has a position dependent dispersion with an average value of 3.95 nm/pixel. The average resolution λ/∆λ for stellar sources is 65, 87, and 78 at wavelengths of 594 nm, 802 nm, and 978 nm.

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Section: Wfc Dark Current Cte and Radiation Damagesupporting

confidence: 72%

“…Sirianni et al 16 provide a detailed discussion of the performance of the ACS CCDs. We briefly summarize the performance of the three cameras here.…”

Section: Wfc and Hrc Detector On-orbit Performance 221 Wfc And Hrcmentioning

confidence: 99%

Section: Wfc Dark Current Cte and Radiation Damagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Overview of the Advanced Camera for Surveys on-orbit performance

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“…The wide field channel (WFC), intended for survey work in the visible and near IR, covers an area of the sky over 200 arcsec square with 50 milli-arcsec pixels on a pair of butted 4Kx2K CCDs. 4 This high efficiency detector, together with the excellent optical throughput provided by the 3 mirror optical design and enhanced silver coatings, and the wide sky coverage, yield an order of magnitude improvement in discovery efficiency over the current HST wide field camera (WFPC2). 3,5,6 The high resolution channel (HRC) employs a 1K square CCD to cover a 26 arcsec square field, from the near UV through near IR, and includes an aberrated beam coronagraphic capability, which permits high contrast studies within about 1 arcsec of bright point sources.…”

Section: Introductionmentioning

confidence: 99%

On-orbit alignment and imaging performance of the HST advanced camera for surveys

et al. 2003

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The Advanced Camera for Surveys (ACS), installed in the Hubble Space Telescope in March 2002, has significantly extended HST's imaging capabilities. We describe the on-orbit optical alignment procedures and results, detailing the excellent image quality performance achieved. Comparison is made with the instrument specifications, ground test results and published performance expectations. The residual aberration content over the field of each channel is described and compared with the optical model, and various other performance measures, including sharpness and encircled energy are treated. The effects of the telescope focus oscillations due to thermal variations ("breathing") and image positional stability are also discussed.

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TheHubbleHigherzSupernova Search: Supernovae toz≈ 1.6 and Constraints on Type Ia Progenitor Models

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Riess

Dahlén

et al. 2004

ApJ

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We present results from the Hubble Higher z Supernova Search, the first space-based open field survey for supernovae (SNe). In cooperation with the Great Observatories Origins Deep Survey, we have used the Hubble Space Telescope with the Advanced Camera for Surveys to cover $300 arcmin 2 in the area of the Chandra Deep Field South and the Hubble Deep Field North on five separate search epochs (separated by $45 day intervals) to a limiting magnitude of F850LP % 26. These deep observations have allowed us to discover 42 SNe in the redshift range 0:2 < z < 1:6. As these data span a large range in redshift, they are ideal for testing the validity of Type Ia supernova progenitor models with the distribution of expected ''delay times,'' from progenitor star formation to Type Ia SN explosion, and the SN rates these models predict. Through a Bayesian maximum likelihood test, we determine which delay-time models best reproduce the redshift distribution of SNe Ia discovered in this survey. We find that models that require a large fraction of ''prompt'' ( less than 2 Gyr) SNe Ia poorly reproduce the observed redshift distribution and are rejected at greater than 95% confidence. We find that Gaussian models best fit the observed data for mean delay times in the range of 2-4 Gyr.

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Characterization and on-orbit performance of the Advanced Camera for Surveys CCDs

Cited by 6 publications

References 6 publications

Overview of the Advanced Camera for Surveys on-orbit performance

Overview of the Advanced Camera for Surveys on-orbit performance

On-orbit alignment and imaging performance of the HST advanced camera for surveys

TheHubbleHigherzSupernova Search: Supernovae toz≈ 1.6 and Constraints on Type Ia Progenitor Models

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