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Page history last edited by Neelima 1 year, 4 months ago


Survey specifications for Cosmology survey:


4000 square degrees

0.1uK-arcmin sensitivity at 150 GHz

10 arcsecond resolution at 150 GHz

frequencies = 90 GHz, 150 GHz,  220 GHz, 270 GHz, 350 GHz, 400 GHz, 675 GHz, and 875 GHz  



Below is a list of suggested science cases provided by the AtLAST community. If/when adding your own suggestions, please read through the current list to ensure you're not duplicating a case, and use the template below for structuring your input.

Links to relevant literature:
CCAT cosmology working group report 2013

Title: Adapted from a CCAT cosmology science summary (20130717)
Contributor: Frank Bertoldi


see also the linked CCAT documents:

kSZ white paper:  https://www.dropbox.com/s/z33cobyo0jbxjp3/CCAT-p.kSZ_whitepaper.pdf?dl=0

Cosmology survey report:  https://www.dropbox.com/s/xr8clw74s25lbhq/20130403-CosmologySurveyReport.pdf?dl=0

CCAT science requirements:  https://www.dropbox.com/s/vyj34897cyjnywy/CCAT_SciReq_old.pdf?dl=0

astro2010:  https://www.dropbox.com/s/umtwpemal1844wh/Golwala_understanding_icm_GCT.pdf?dl=0

astro2010:  https://www.dropbox.com/s/5193iybsizb4ol6/Golwala_calibrating_clusters_CFP.pdf?dl=0

A set of unparalleled cosmological measurements will be possible with AtLAST. These will be enabled by
AtLAST’s unique technical capabilities: the broad spectral coverage, wide field-of-view, and fine angular resolution of AtLAST LWCam, the multi-object/integral fiedl wide-field spectroscopy capability, and the excellent atmospheric opacity and access to well-studied fields afforded by the site. AtLAST surveys will address a number of major open questions in cosmology:

  • How can the observable properties of the peaks in the cosmological density field — galaxy clusters — be quantitatively related to underlying physical processes?
  • How did the universe become reionized?
  • What are the amplitude and the statistical properties of the primordial density fluctuation field? Are these consistent with the inflationary paradigm?
  • What is the neutrino mass scale and what are the parameters of the dark energy that drives the universe’s accelerating expansion or the modified theory of gravity needed to explain it?

The primary tools for responding to these questions will be multi-wavelength observations of the Sunyaev-Zel’dovich (SZ) effects, gravitational lensing of the Cosmic Microwave Background (CMB), and [CII] survey spectroscopy. In order of priority, first-generation AtLAST surveys will enable:

  • thermal and kinetic SZ and CMB lensing observations of the thermal pressure and bulk internal motions of the intracluster medium and total matter density profile in individual galaxy clusters at an unprecedented combination of depth and angular resolution on a variety of high-statistics samples derived from ongoing and future SZ, X-ray, and optical surveys;
  • measurements of the cosmological peculiar velocity field out to z = 1 via kinetic SZ measurements of individual cluster velocities in these large samples, resulting in significant constraints on dark energy, neutrino mass, and modified gravity;
  • measurement of the thermal and kinetic SZ anisotropy power spectra in the multipole range 2000 to 20000, which will constrain the amplitude of the power spectrum of density fluctuations, probe the post-reionization peculiar velocity field, and study the process by which the universe became reionized;
  • mass-limited thermal SZ surveys for galaxy clusters over hundreds to thousands of square degrees with reduced systematic uncertainties relative to prior surveys, as well as possible improvements in the mass calibration of galaxy clusters discovered in those prior surveys, via CCAT’s better spectral and morphological separation of spectrally overlapping signals. These observations will yield precise constraints on the cosmological growth function (and corresponding constraints on dark energy parameters and neutrino mass), non-Gaussianity of the primordial density fluctuation field, and departures from general relativity;
  • and, a variety of secondary or more speculative science goals whose utility will be further studied.

Beyond first light, second- and third-generation spectrometers will enable classical cosmological measurements using baryon acoustic oscillations and redshift-space distortions in the redshift range 3 to 5, an epoch inaccessible to any current or planned survey, enabling studies of the properties and time evolution of dark energy or modified gravity in an unexplored regime.

Title: CMB de-lensing studies
Summary: Dark energy constraints from CMB will be limited by CIB contamination.  The current state of the art is in Herschel * SPT or ACT cross-correlations, which are severely limited by the confusion in Herschel studies.  If AtLAST can cover a significant portion of the sky to ~1 microK depths, it could be a powerful tool for separating the CIB and improving dark energy constraints. 
Contributor: Lorenzo Moncelsi? Nick Battaglia?
Interested: Tony Mroczkowski



Title: My Contributed Science Case
Summary: Here I'm going to regale you with a tale of the amazing contributions to my field that the AtLAST telescope will be able to provide. There are a lot of specifics in this summary, but I'm striving to keep it short and succinct. I also don't need any figures or tables to drive my point home.
Contributor: I.M Awesome
Interested: I. Should-have Thought-of-that


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