Chasing the tail: measuring a proper motion of the Coma cluster dwarf ram-pressure-stripped galaxy GMP2640 with its extraordinary star cluster population.

0 Assigned ID: 4634 ----- Attempting Submission 1 (Wed May 24 20:49:22 GMT 2023) ----- 0 ----- Attempting Submission 1 (Thu Sep 14 19:18:28 GMT 2023) ----- HST Phase II Proposal 17519 successfully submitted. Receipt: # 17519-1 ----- Attempting Submission 3 (Thu Oct 05 18:01:19 GMT 2023) ----- ----- Attempting Submission 5 (Wed Oct 30 14:23:56 GMT 2024) ----- correcting back to previous version, auto-adjusted windows for single-gyro guiding. - Wilson Skipper (PC) Chasing the tail: measuring a proper motion of the Coma cluster dwarf ram-pressure-stripped galaxy GMP2640 with its extraordinary star cluster population. GMP2640 is the most luminous diffuse post-starburst galaxy in the Coma cluster (D=99Mpc) identified using data mining. Despite relatively low stellar mass (2.4*10^9 MSun), it hosts a strikingly large population of 450+ massive intermediate-age star clusters detected in an archival HST image in its disk and hundreds of additional clusters in its spectacular 270kpc-long ram-pressure-blown tail. Measuring age gradient of clusters along the tail opens a unique opportunity to measure a velocity of GMP2640 in the plane of the sky, i.e. its proper motion at the striking distance of 100Mpc. We propose to collect high-resolution HST images of GMP2640 and its tail using WFC3 in prime orbits and ACS/WFC in coordinated parallel fields. We will detect star cluster populations and measure their ages, metallicities, hence mass and luminosity functions, and assess the plausibility of the formation of central star clusters in a dEs via mergers of in-situ formed star clusters. Our project will address the question of rich star cluster systems in low-mass galaxies as well as the question of dE/UDG formation via ram pressure stripping in galaxy clusters. Here we propose to obtain high-resolution NUV and optical images of the diffuse post-starburst galaxy GMP 2640 and its spectacular tail with WFC3/UVIS using a special combination of filters to disentangle age and metallicity effects in stellar populations (and Advanced Camera for Surveys in the coordinated parallel mode for the older part of the tail). The selected filters are F200LP, F350LP, and F600LP filters for WFC3-UVIS scheduled for the 6 primary orbits (3 orbits per field; 1 orbit per filter). (i) the F200LP-F350LP difference image provides the deepest broad-band near-UV imaging available at the HST, which is required to precisely age young and intermediate-age star clusters and by using UV stellar continuum from B and A stars (GMP~2640 has a strong GALEX detection); (ii) F600LP will be the primary filter for the 2D light profile decomposition of the main galaxy spheroid; the F350_600LP-F650LP color will be used to estimate stellar population gradients. This filter combination will be crucial to measure star cluster ages and metallicities. We will use coordinated parallel observations of the outer part of the RPS tail of GMP 2640 with ACS/WFC using optical colors (2 orbits in F475W and 1 orbit in F814W for each pointing). The main goal of the parallel observations is the to collect deep optical images of the filaments of the tail, which are not resolved into clusters in the ground-based Subaru HyperSuprimeCam (120 - 250 kpc from the center of GMP 2640). If we detect fainter and older star clusters, this will become an important step towards understanding the unbound star cluster population and its contribution to the intracluster light in Coma. For this reason, we have a position angle constraint of 110+- 10 deg (a slight change in the angle can be compensated by shifting the center of the field) limiting the scheduling to Jun--Aug. Our team includes 4 members: Our team includes 4 members: 1. Igor Chilingarian, PI, staff astronomer at Center for Astrophysics | Harvard and Smithsonian (USA); 2. Anton Afanasiev, co-PI, postdoc at Observatoire de Paris-Meudon (France); 3. Kirill Grishin, co-PI, PhD student at University of Paris (France); 4. Ivan Katkov, co-I, postdoc at New York University Abu Dhabi (UAE) Our team (all 4 members) has recently finished a paper (Grishin et al. 2021 Nature Astronomy) presenting the discovery of diffuse PSGs in Coma and Abell2147 and interpretation of their properties as being future UDGs and dEs formed via ram pressure stripping. The core team members IC and IK have been working together for over a decade; Anton Afanasiev and Kirill Grishin joined us in 2015 and 2016 during their 1st undergraduate year and already co-authored several refereed papers (MNRAS, ApJ and ApJS; three of those papers were followed with press releases and attracted media attention). KG gave numerous presentations at professional conferences including an invited talk (tutorial on the reparation of observations) at the 40th anniversary of the MMT observatory. AA discovered one of the 5 known central black holes in ultracompact dwarf galaxies (1st author MNRAS paper with a press release published by an undergraduate student). We have solid experience in the cutting-edge Virtual Observatory powered research in astrophysics which resulted in 2 publications in AAAS Science (Chilingarian et al. 2009 and Chilingarian & Zolotukhin 2015). With very limited manpower, we have successfully completed several projects, which included large-scale data analysis efforts, e.g. development of a dedicated data analysis technique and subsequent analysis of 1 million SDSS spectra. We compiled a multi-wavelength FUV-to-NIR Reference Catalog of Spectral Energy Distributions of galaxies (RCSED; Chilingarian et al. 2017 ApJS 228 14; http://rcsed.sai.msu.ru/) and identified the first bona fide population of intermediate-mass black holes using it (Chilingarian et al. 2018 ApJ 863 1). During the last 3 years we have been running a very successful multi-wavelength campaign on search and characterization of intermediate-mass black holes and their host galaxies using Chandra, XMM-Newton, Swift,intermediate-resolution ground-based optical spectroscopy using MagE at the 6.5-m Magellan Telescope, NIRgound-based imaging using Magellan and MMT. In 2018-2019 we ran a spectroscopic survey project on Coma cluster low-luminosity and ultra-diffuse galaxies using the new high-throughput spectrograph Binospec at the 6.5-m MMT. The objects we propose to observe here were among the targets of our survey. We have performed analysis of multi-wavelength HST WFC3 and ACS/WFC data for several projects in the past, including the IMBH search and identification project published in 2018 in ApJ which falls into the 3% of most cited papers in astrophysics published in 2018. We will likely include additional undergraduate students in our team once the data have been acquired. Galaxies Intergalactic Medium and the Circumgalactic Medium 6 false true false false false false SUPPORTED GALAXY DWARF ELLIPTICAL J2000 J2000 ISM TIDAL TAIL J2000 J2000 WFC3/UVIS Imaging No No F200LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F600LP ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F200LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F600LP ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F814W POS-TARG DITHER DITHER 4 3.6 WFC3-UVIS-DITHER-BOX false 81.785 true 0.112 0.173 2 85.759 POS-TARG WFC3-UVIS-GAP-LINE 23.884 1

false

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