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The DESI DR1 Peculiar Velocity Survey: Global Zero-point and H₀ Constraints

Authors: A. Carr, C. Howlett, A. J. Amsellem, Tamara M. Davis, K. Said, D. Parkinson, A. Palmese, J. Aguilar, S. Ahlen, J. Bautista, S. BenZvi, D. Bianchi, C. Blake, D. Brooks, T. Claybaugh, A. Cuceu, A. de la Macorra, P. Doel, K. Douglass, S. Ferraro, J. E. Forero-Romero, E. Gaztañaga, S. Gontcho A Gontcho, G. Gutierrez, H. K. Herrera-Alcantar, K. Honscheid, D. Huterer, M. Ishak, R. Joyce, A. G. Kim, D. Kirkby, A. Kremin, O. Lahav, C. Lamman, M. Landriau, L. Le Guillou, M. E. Levi, M. Manera, A. Meisner, R. Miquel, J. Moustakas, S. Nadathur, W. J. Percival, F. Prada, I. Pérez-Ràfols, F. Qin, C. Ross, G. Rossi, E. Sanchez, D. Schlegel, H. Seo, D. Sprayberry, G. Tarlé, R. J. Turner, B. A. Weaver, P. Zarrouk, R. Zhou, H. Zou

A. Carr et al 2026 The Astrophysical Journal 1004 .

Provider: AAS Journals

Caption: Figure 1.

Example of how we combine group catalogs to discover calibrators that are in the same group as DESI PV galaxies. Taking Lim group 2dFGRS 949 (orange circles in the left panel) as the initial group that contains one of our DESI PV galaxies (step 3), the SDSS group (green circles) was found to overlap (step 4), and then 2dFGRS 4889 was linked (step 6). The final group is defined as all galaxies discovered in the process (pink circles in the right panel). If any galaxy in the final group has a known distance, we can use it to calibrate the entire group and any PV galaxies in it (yellow crosses in the right panel). The background image is from the DESI Legacy Survey viewer, and the ellipses are for visualization only. To distinguish the galaxies that appear in multiple groups in the left panel, the individual symbols are offset from the center of the galaxy. The group identifiers are internal to the Lim catalog (a “+” denotes our expanded definition).

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