0
Assigned ID: 4510
----- Attempting Submission 1 (Wed May 24 19:02:39 GMT 2023) -----
HST Phase I Proposal 4510 successfully submitted.
Receipt: # 4510-1
----- Attempting Submission 2 (Wed May 24 21:08:13 GMT 2023) -----
HST Phase I Proposal 4510 successfully submitted.
Receipt: # 4510-2
----- Attempting Submission 3 (Wed May 24 23:50:05 GMT 2023) -----
Additonal Phase II submission for HST program GO-17153. Split repeat visit 54 into two shorter visits to improve schedulability.
1908343234
----- Attempting Submission 1 (Thu Sep 07 19:30:03 GMT 2023) -----
HST Phase II Proposal 17513 successfully submitted.
Receipt: # 17513-1
----- Attempting Submission 2 (Thu Sep 07 21:21:03 GMT 2023) -----
----- Attempting Submission 4 (Fri Jan 24 19:13:35 GMT 2025) -----
Proper Motions of Galaxies in the M81 Group: Unleashing the Full Power of HST's 20-year Time Baseline
We propose, for the first time, to measure the bulk proper motions (PMs) of a galaxy group outside the Local Group (LG). We will do this by obtaining bulk PMs of the three most massive central galaxies of the M81 group at 3.6 Mpc: M81, M82 and NGC 3077. These galaxies are some of the most studied objects in astronomy, with M81 being a canonical grand-design spiral galaxy and M82 the prototype for starburst-driven outflows. These features are driven by an ongoing major merger between these galaxies. We will reimage archival HST fields with a 20-year baseline. Combined with the existing position, distance and radial velocity this will yield 6D position-velocity information. This will allow us to precisely determine the galaxy orbits, shedding light on their past interactions during the ongoing major merger as well as their future trajectories. This will allow us to answer key questions, not only for the M81 Group but also broader universe: (1) how can the observed tidal features be understood dynamically? (2) What is the future of the group, and will either M82 or NGC 3077 be ejected by the three body interaction? (3) What is the mass of the dark matter halos of M81 and M82? (4) What is the transverse velocity of the M81 group, relative to the LG, and how does this compare to our cosmological understanding? The answers will inform simulations and models of galaxy mergers and local flows. We will obtain the first galaxy PMs outside the LG, as well as the first 6D dynamical constraints on an ongoing major merger. These innovations show how HST's longevity allows us to open up new windows on the universe previously considered inaccessible.
We will observe 3 target fields of M81 Group using ACS/WFC. All of our target fields have deep ACS/WFC imaging data in the HST archive. In this program, each target field will be observed using the same telescope pointings and orientations as the first-epoch images to maximize the overlaps of the observed fields between first- and second-epoch data. This will also minimize position-dependent uncertainties originating from imperfect CTE and geometric distortion corrections. To measure PMs, it is sufficient to observed only in one filter. We will image all target fields using the F814W filter to measure PMs. For the M82 field, we will also image in F606W filter to construct CMDs that will allow us to separate member stars of target galaxies from foreground contaminants. Individual exposure times will be full-orbit long, and we will use dithered patterns specially designed to maxmimuze pixel-phase coverage.
Team Expertise:
All investigators are members of the HSTPROMO group, led by co-I van der Marel, which has published numerous papers reporting proper motion measurements of dwarf galaxies, globular clusters, individual stars along stellar streams, and distant Milky Way (MW) halo stars.
PI Dr Paul Bennet is an expert in satellites inside and outside of the LG. He has had previous experience leading successful HST programs e.g GO-15858 (Bennet et al. 2020). He will perform the majority of the work for this project.
Co-I Dr Tony Sohn is an expert in measuring HST proper motions, his past measurements include M31, bulk proper motions of dwarf spheroidal galaxies in the Milky Way halo (Leo I, Draco, and Sculptor), individual proper motions of stars along stellar streams such as Sagittarius, Orphan, and Lethe, distant Milky Way globular clusters, and M31 satellites NGC 147 and 185. He will contribute to the PM measurements part of this work.
Co-I Dr Andres del Pino-Molina is an expert in analysis of internal dynamics and star formation histories of dwarf galaxies in the Local Group. He will contribute to the interpretation of the results.
Co-Is Dr Mark Fardal, Dr Ekta Patel, Dr Roeland van der Marel, Dr. Eduardo Vitral and Dr Laura Watkins are experts in HST kinematic analysis, dynamical mass estimation, and dynamical modeling of Local Group and nearby Local Volume galaxies including both equilibrium and N-body modeling. They will contribute to the orbital calculations and interpretation of the results.
See list of refereed publications by the HSTPROMO group at http://www.stsci.edu/~marel/hstpromo.html#Papers
Galaxies
Stellar Populations and the Interstellar Medium
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true
3
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Timing link suitability includes constraints ([Group (57 58 60) Within 30.0 days])
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This is a 3-orbit visit for M82.
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true
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Timing link suitability includes constraints ([Group (05 06 07 08 09 10) Within 30.0 days])
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1
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false
3
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true
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true
2
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This is a 3-orbit visit for NGC 3077.
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