分类： 天文学 >> 天文学 提交时间： 2023-02-19
Alex G. Kim
Antonella Palmese
Maria E. S. Pereira
Greg Aldering
Felipe Andrade-Oliveira
James Annis
Stephen Bailey
Segev BenZvi
Ulysses Braga-Neto
Frédéric Courbin
Alyssa Garcia
David Jeffery
Gautham Narayan
Saul Perlmutter
Marcelle Soares-Santos
Tommaso Treu
Lifan Wang
摘要： This invited Snowmass 2021 White Paper highlights the power of joint-analysis of astronomical transients in advancing HEP Science and presents research activities that can realize the opportunities that come with current and upcoming projects. Transients of interest include gravitational wave events, neutrino events, strongly-lensed quasars and supernovae, and Type~Ia supernovae specifically. These transients can serve as probes of cosmological distances in the Universe and as cosmic laboratories of extreme strong-gravity, high-energy physics. Joint analysis refers to work that requires significant coordination from multiple experiments or facilities so encompasses Multi-Messenger Astronomy and optical transient discovery and distributed follow-up programs.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Christoph Saulder
Cullan Howlett
Kelly A. Douglass
Khaled Said
Segev BenZvi
Steven Ahlen
Greg Aldering
Stephen Bailey
David Brooks
Tamara Davis
Axel de la Macorra
Arjun Dey
Andreu Font-Ribera
Jaime E. Forero-Romero
Satya Gontcho A Gontcho
Klaus Honscheid
Alex G. Kim
Theodore Kisner
Anthony Kremin
Martin Landriau
摘要： We describe the target selection and characteristics of the DESI Peculiar Velocity Survey, the largest survey of peculiar velocities (PVs) using both the fundamental plane (FP) of galaxies and the Tully-Fisher (TF) relationship planned to date. We detail how we identify suitable early-type galaxies for the FP and suitable late-type galaxies for the TF relation using the photometric data provided by the DESI Legacy Imaging Survey DR9. Subsequently, we provide targets for 373 533 early-type galaxies and 118 637 late-type galaxies within the DESI 5-year footprint. We validate these photometric selections using existing morphological classifications. Furthermore, we demonstrate using survey validation data that DESI is able to measure the spectroscopic properties to sufficient precision to obtain PVs for our targets. Based on realistic DESI fiber assignment simulations and spectroscopic success rates, we predict the final DESI Peculiar Velocity Survey will obtain $\sim$133 000 FP-based and $\sim$53 000 TF-based PV measurements over an area of 14 000 $\mathrm{deg^{2}}$. Each of these components will be a factor of 4--5 larger than other recent samples. We forecast the ability of using these data to measure the clustering of galaxy positions and peculiar velocities from the combined DESI PV and Bright Galaxy Surveys (BGS), which allows for cancellation of cosmic variance at low redshifts. With these forecasts, we anticipate a $4\%$ statistical measurement on the growth rate of structure at $z<0.15$. This is over two times better than achievable with redshifts from the BGS alone. The combined DESI PV and Bright Galaxy surveys will enable the most precise tests to date of the time and scale dependence of large-scale structure growth at $z<0.15$.
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