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SUMMARY:New Satellite Dwarf Galaxies of NGC2683 and M104 and the Search fo
 r Satellite Planes.
DTSTART;VALUE=DATE-TIME:20230324T110000Z
DTEND;VALUE=DATE-TIME:20230324T111500Z
DTSTAMP;VALUE=DATE-TIME:20241114T092457Z
UID:indico-contribution-216@meetings.aip.de
DESCRIPTION:Speakers: Ethan Crosby (ANU)\nSince the early 2000s satellite 
 dwarf galaxies of the Local Group and more recently\, the nearby Centaurus
  A/M83 group\, have been known to show morphological characteristics and s
 patial distributions that do not match predictions from ΛCDM simulations.
  In particular\, satellite dwarf galaxies inhabiting the Local Group and t
 he Centaurus A/M83 group appear to be co-rotating in confined disks known 
 as satellite planes. ΛCDM simulations have failed to fully reproduce sate
 llite planes despite increasingly advanced simulations\, including baryon 
 physics\, and aren’t associated with galactic analogues of the local uni
 verse in ΛCDM simulations. Several presented hypotheses suggest that thes
 e apparent discrepancies may be the result of one of three mechanisms\; th
 at statistical bias in determinations of satellite planes in the local uni
 verse leads to inflated significance\, that simulations fail to simulate s
 ome feature of the universe or that unique conditions in the local univers
 e led to the formation of satellite planes. This is motivating an internat
 ional effort to search for satellite galaxies and ultimately\, satellite p
 lanes\, outside of the local universe. Using the Hyper Suprime Cam from th
 e Subaru telescope\, we capture ~4 degree field of view images of nearby i
 solated L* galaxy environments with the intent of identifying satellite dw
 arf galaxies complete to an absolute g-band magnitude of >-10 and ultimate
 ly\, identifying satellite planes. These environments reside outside of th
 e Local Sheet\, which may have provided the conditions that favours the ge
 neration of satellite planes\, or the galaxies within may not form an inde
 pendent sample which reduces the significance of satellite planes. Our rec
 ent research has focused on searching for the satellite galaxies of M104 a
 nd NGC2683\, two mostly isolated galaxy environments that reside outside o
 f the local sheet and are thus free from biases associated with it. Across
  these two environments\, we find over 20 newly discovered highly probably
  dwarf galaxy candidates up to projected radii of 400 kpc\, which for NGC2
 683 are distributed in an anisoptric\, flattened disk and for M104\, a lop
 -sided but circular disk. We intend to follow up these candidates with obs
 ervations using IFU-M\, a novel IFU spectroscope undergoing commissioning 
 at the Magellan telescopes of the Las Campanas Observatory in Chile. These
  spectroscopic observations will confirm that our new galaxy candidates ar
 e associated with their assumed hosts\, determine if co-rotation is presen
 t\, and for brighter candidates\, allow us to explore the mass-to-light ra
 tios and star formation histories of these dwarf galaxies. This spectrosco
 pically enhanced dataset of newly discovered dwarf satellite galaxies limi
 ts statistical bias and enables us to answer questions about the local uni
 verse and our cosmological models\; is the local universe a cosmological o
 ddity\, or do our models of the universe fail to account for an unknown fa
 ctor?\n\nhttps://iaus379.aip.de/event/20/contributions/216/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/216/
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