AGC 226178 and NGVS 3543: Two Deceptive Dwarfs toward Virgo

Jones, Michael G.; Sand, David J.; Bellazzini, Michele; Spekkens, Kristine; Cannon, John M.; Mutlu-Pakdil, Burçin; Karunakaran, Ananthan; Beccari, Giacomo; Magrini, Laura; Cresci, Giovanni; Inoue, John L.; Fuson, Jackson; Adams, Elizabeth A. K.; Battaglia, Giuseppina; Bennet, Paul; Crnojević, Denija; Caldwell, Nelson; Guhathakurta, Puragra; Haynes, Martha P.; Muñoz, Ricardo R.; Seth, Anil; Strader, Jay; Toloba, Elisa; Zaritsky, Dennis

doi:10.3847/2041-8213/ac51dc

Title: AGC 226178 and NGVS 3543: Two Deceptive Dwarfs toward Virgo

Journal Article · 17 February 2022 · The Astrophysical Journal. Letters

DOI: https://doi.org/10.3847/2041-8213/ac51dc · OSTI ID:1983319

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University of Arizona, Tucson, AZ (United States)
INAF–Osservatorio di Astrofisica e Scienza dello Spazio di Bologna (Italy)
Royal Military College of Canada, ON (Canada); Queen's University, Kingston, ON (Canada)
Macalester College, Saint Paul, MN (United States)
University of Chicago, IL (United States)
Queen's University, Kingston, ON (Canada); Instituto de Astrofísica de Andalucía (CSIC), Granada (Spain)
European Southern Observatory, Garching bei München (Germany)
INAF–Osservatorio Astrofisico di Arcetri, Firenze (Italy)
ASTRON, the Netherlands Institute for Radio Astronomy, Dwingeloo (Netherlands)
Instituto de Astrofísica de Canarias, La Laguna (Spain); Universidad de La Laguna, Tenerife (Spain)
Space Telescope Science Institute, Baltimore, MD (United States)
University of Tampa, FL (United States)
Harvard & Smithsonian, Cambridge, MA (United States)
University of California Santa Cruz, CA (United States)
Cornell University, Ithaca, NY (United States)
Universidad de Chile, Santiago (Chile)
University of Utah, Salt Lake City, UT (United States)
Michigan State University, East Lansing, MI (United States)
University of the Pacific, Stockton, CA (United States)

The two sources AGC 226178 and NGVS 3543, an extremely faint, clumpy, blue stellar system and a low surface brightness dwarf spheroidal, are adjacent systems in the direction of the Virgo cluster. Both have been studied in detail previously, with it being suggested that they are unrelated normal dwarf galaxies or that NGVS 3543 recently lost its gas through ram pressure stripping and AGC 226178 formed from this stripped gas. However, with Hubble Space Telescope Advanced Camera for Surveys imaging, we demonstrate that the stellar population of NGVS 3543 is inconsistent with being at the distance of the Virgo cluster and that it is likely a foreground object at approximately 10 Mpc, whereas the stellar population of AGC 226178 is consistent with it being a very young (10–100 Myr) object in the Virgo cluster. Through a reanalysis of the original ALFALFA H i detection, we show that AGC 226178 likely formed from gas stripped from the nearby dwarf galaxy VCC 2034, a hypothesis strengthened by the high metallicity measured with MUSE VLT observations. However, it is unclear whether ram pressure or a tidal interaction is responsible for stripping the gas. Object AGC 226178 is one of at least five similar objects now known toward Virgo. These objects are all young and unlikely to remain visible for over ~500 Myr, suggesting that they are continually produced in the cluster.

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Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: USDOE

OSTI ID:: 1983319

Journal Information:: The Astrophysical Journal. Letters, Journal Name: The Astrophysical Journal. Letters Journal Issue: 2 Vol. 926; ISSN 2041-8205

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: AGC 226178 and NGVS 3543: Two Deceptive Dwarfs toward Virgo

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