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| Cardelli, Clayton & Mathis | |
|---|---|
| Name | Cardelli, Clayton & Mathis |
| Field | Astrophysics |
| Known for | CCM extinction law |
| Notable works | "The Relationship between Infrared, Optical, and Ultraviolet Extinction" |
Cardelli, Clayton & Mathis were authors of a widely cited empirical parameterization of interstellar extinction in the Milky Way published in 1989, which has been influential across observational astronomy and astrophysics. Their work provided a practical analytic formula linking ultraviolet, optical, and infrared extinction that has been used by researchers at institutions such as Harvard University, California Institute of Technology, and University of Cambridge while informing observational programs with facilities like the Hubble Space Telescope, International Ultraviolet Explorer, and Spitzer Space Telescope.
The 1989 CCM paper presented an extinction curve parameterization that unified results from earlier studies by researchers connected to observatories such as Mount Wilson Observatory, Palomar Observatory, and Kitt Peak National Observatory and complemented models from groups at Max Planck Institute for Astronomy, Jet Propulsion Laboratory, and Smithsonian Astrophysical Observatory. The CCM formulation built on prior empirical work by teams including Stecher, Savage, Mathis, Draine, and Fitzpatrick and has been adopted in surveys conducted by collaborations like the Sloan Digital Sky Survey, Two Micron All Sky Survey, and projects involving the European Southern Observatory. CCM quickly became standard for correcting reddening in studies of stellar populations in the Milky Way, Large Magellanic Cloud, and Small Magellanic Cloud as well as in extragalactic research at institutions like Max Planck Institute for Astrophysics and universities including Princeton University and University of California, Berkeley.
The CCM law expresses total-to-selective extinction R_V as a key parameter used by astrophysicists at centers such as Space Telescope Science Institute and Royal Astronomical Society and is referenced in modeling efforts by scientists associated with University of Chicago, Columbia University, and University of Arizona. It parameterizes A(λ)/A(V) across wavelengths used by instruments on International Ultraviolet Explorer, Ultraviolet Imaging Telescope, and Galaxy Evolution Explorer and connects ultraviolet features studied by teams at European Space Agency and NASA to optical/infrared measurements from telescopes like Keck Observatory and Very Large Telescope. The CCM curve incorporates the 2175 Å bump, previously characterized by observers at Yale University and University of Toronto, and provides a simple one-parameter family of extinction curves applied by investigators from University of Pennsylvania, Rutgers University, and Carnegie Institution for Science.
CCM derived analytic formulae by fitting spectrophotometric datasets assembled by observers from Royal Greenwich Observatory, Cerro Tololo Inter-American Observatory, and Lick Observatory and by integrating photometry from surveys such as Hipparcos and Infrared Astronomical Satellite. The approach used normalized extinction A(λ)/A(V) and the parameter R_V = A(V)/E(B−V), a metric employed by researchers at European Southern Observatory and Max Planck Institute for Astrophysics, to scale curves across ultraviolet to infrared regimes; fitting methods mirrored statistical techniques used at Massachusetts Institute of Technology and University of Cambridge. CCM combined spline-like optical fits with analytic ultraviolet components influenced by functional forms later compared to theoretical dust models developed by groups led by Bohren, Draine, and Zubko at institutions including Princeton University and University of Massachusetts Amherst.
Astronomers at observatories such as Mount Palomar Observatory, Subaru Telescope, and Arecibo Observatory have applied CCM to deredden spectra in studies of stellar atmospheres by teams from University of Oxford, University of Tokyo, and University of Washington. Supernova cosmology programs at Carnegie Observatories, Lawrence Berkeley National Laboratory, and collaborations behind the Supernova Cosmology Project and High-Z Supernova Search Team used CCM-based extinction corrections in distance modulus calculations alongside extinction treatments at Kavli Institute for Cosmology and Institute for Astronomy, Cambridge. Large-scale Galactic structure efforts by researchers affiliated with Max Planck Institute for Radio Astronomy, University of Wisconsin–Madison, and University of California, Santa Cruz incorporated CCM when mapping dust lanes imaged by Planck and WISE teams and when analyzing data from missions like Gaia and instruments at National Optical-Infrared Astronomy Research Laboratory.
Subsequent studies by scientists at Harvard-Smithsonian Center for Astrophysics, University of Colorado Boulder, and Ohio State University identified sightlines, including dense molecular cloud regions studied by Institut d'Astrophysique Spatiale and Institut d'Astrophysique de Paris, where CCM poorly represents observed extinction, prompting alternative parameterizations proposed by groups at University of Arizona and University of Leeds. Observers using facilities such as ALMA, James Webb Space Telescope, and SOFIA have highlighted deviations in mid-infrared behavior relative to CCM predictions, with theoretical work from Cardelli, Clayton, and Mathis critics like Fitzpatrick and Gordon advocating multi-parameter or environment-specific models developed at University of Illinois Urbana-Champaign and University of Minnesota. Debates at conferences hosted by American Astronomical Society and International Astronomical Union have emphasized issues including regional variations in the 2175 Å bump and grain composition effects studied by groups at California Institute of Technology and University of New South Wales.
The CCM law influenced curricula at universities such as University of Cambridge, Harvard University, and University of California, Berkeley and underpinned extinction corrections in major programs run by NASA, ESA, and national observatories like National Radio Astronomy Observatory. It spurred theoretical dust grain research at institutions such as Max Planck Institute for Astronomy and University of Arizona and motivated empirical surveys by teams at Swinburne University of Technology, University of Edinburgh, and University of Toronto. CCM remains a foundational reference used in pipelines at observatories like Gemini Observatory and Subaru Telescope, while its limitations have driven development of advanced models by researchers at Princeton University and University of Chicago that account for environment-dependent extinction and grain physics explored at Northwestern University and University of Colorado Boulder.