A Search for Satellite Galaxies of Nearby Star-Forming Galaxies with Resolved Stars in LBT-SONG

Garling, Christopher T.; Peter, Annika H. G.; Kochanek, Christopher S.; Sand, David J.; Crnojević, Denija

doi:10.48550/arxiv.2105.01082

Cited by 3 publications

(3 citation statements)

References 107 publications

(162 reference statements)

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“…It is also interesting to compare our results with those of Garling et al (2021) for the more distant galaxies NGC 3077 and NGC 4214, located more than 3 Mpc away. While the data of the LBT-SONG survey used by these authors are comparable or deeper than the PAn-dAS data, the larger distance forces them to ingest artificial dwarf-galaxy stars directly in the images to properly account for crowding that becomes an issue because of the smaller angular size of the systems.…”

Section: Discussionmentioning

confidence: 75%

The PAndAS View of the Andromeda Satellite System. III. Dwarf galaxy detection limits

Doliva-Dolinsky,

Martin,

Thomas

et al. 2022

Preprint

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We determine the detection limits of the search for dwarf galaxies in the Pan-Andromeda Archaeological Survey (PAndAS) using the algorithm developed by the PAndAS team (Martin et al. 2013). The recovery fractions of artificial dwarf galaxies are, as expected, a strong function of physical size and luminosity and, to a lesser extent, distance. We show that these recovery fractions vary strongly with location in the surveyed area because of varying levels of contamination from both the Milky Way foreground stars and the stellar halo of Andromeda. We therefore provide recovery fractions that are a function of size, luminosity, and location within the survey on a scale of ∼ 1 × 1 deg 2 (or ∼ 14 × 14 kpc 2 ). Overall, the effective surface brightness for a 50-percent detection rate range between 28 and 30 mag arcsec −2 . This is in line with expectations for a search that relies on photometric data that are as deep as the PAndAS survey. The derived detection limits are an essential ingredient on the path to constraining the global properties of Andromeda's system of satellite dwarf galaxies and, more broadly, to provide constraints on dwarf galaxy formation and evolution in a cosmological context.

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Section: Discussionmentioning

confidence: 75%

The PAndAS View of the Andromeda Satellite System. III. Dwarf galaxy detection limits

Doliva-Dolinsky,

Martin,

Thomas

et al. 2022

Preprint

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“…There are about 60 known satellite galaxies of the MW [438], many of which have measurements of stellar kinematics from large ground-based telescopes and orbital properties (such as pericenter distances) constrained with Gaia data. Several surveys are now able to detect satellites in MW-like galaxies in the Local Volume and this number will grow in the coming years [439,437,440,441,56,442,443,444,445,446,447,448,449,450]. The implications of these measurements for general SIDM models remains to be fully explored.…”

Section: Dwarf Galaxies In the Local Group And Beyondmentioning

confidence: 99%

Astrophysical Tests of Dark Matter Self-Interactions

Adhikari¹,

Banerjee²,

Boddy³

et al. 2022

Preprint

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Self-interacting dark matter (SIDM) arises generically in scenarios for physics beyond the Standard Model that have dark sectors with light mediators or strong dynamics. The selfinteractions allow energy and momentum transport through halos, altering their structure and dynamics relative to those produced by collisionless dark matter. SIDM models provide a promising way to explain the diversity of galactic rotation curves, and they form a predictive and versatile framework for interpreting astrophysical phenomena related to dark matter.This review provides a comprehensive explanation of the physical effects of dark matter self-interactions in objects ranging from galactic satellites (dark and luminous) to clusters of galaxies and the large-scale structure. The second major part describes the methods used to constrain SIDM models including current constraints, with the aim of advancing tests with upcoming galaxy surveys. This part also provides a detailed review of the unresolved small-scale structure formation issues and concrete ways to test simple SIDM models. The

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“…see the recent simulations and discussion in Mutlu-Pakdil et al 2021). Indeed, the census of faint dwarfs around nearby galaxies is well underway using resolved and unresolved imaging (e.g., Chiboucas et al 2013;Sand et al 2014Sand et al , 2015Crnojević et al 2014Crnojević et al , 2016bCrnojević et al , 2019Carlin et al 2016Carlin et al , 2021aToloba et al 2016c;Danieli et al 2017;Smercina et al 2018;Bennet et al 2017Bennet et al , 2019Bennet et al , 2020Carlsten et al 2020;Davis et al 2021;Drlica-Wagner et al 2021;Carlsten et al 2021;Garling et al 2021), as well as spectroscopic surveys around MW analogs at larger distances (Geha et al 2017;Mao et al 2020). These data are already yielding new challenges, with simulations of MW-like galaxies showing a higher fraction and number of quiescent satellites with respect to the observations (Karunakaran et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Hubble Space Telescope Observations of NGC 253 Dwarf Satellites: Discovery of Three Ultra-faint Dwarf Galaxies

Mutlu-Pakdil,

Sand,

Crnojević

et al. 2021

Preprint

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We present deep Hubble Space Telescope imaging of five faint dwarf galaxies associated with the nearby spiral NGC 253 (D≈3.5 Mpc). Three of these are newly discovered ultra-faint dwarf galaxies, while all five were found in the Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS), a Magellan+Megacam survey to identify faint dwarfs and other substructures in resolved stellar light around massive galaxies outside of the Local Group. Our HST data reach 3 magnitudes below the tip of the red giant branch for each dwarf, allowing us to derive their distances, structural parameters, and luminosities. All five systems contain predominantly old, metal-poor stellar populations (age∼12 Gyr, [M/H] −1.5) and have sizes (r h ∼110-3000 pc) and luminosities (M V ∼−7 to −12 mag) largely consistent with Local Group dwarfs. The three new NGC 253 satellites are among the faintest systems discovered beyond the Local Group. We also use archival H i data to place limits on the gas content of our discoveries. Deep imaging surveys such as our program around NGC 253 promise to elucidate the faint end of the satellite luminosity function and its scatter across a range of galaxy masses, morphologies, and environments in the decade to come.

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A Search for Satellite Galaxies of Nearby Star-Forming Galaxies with Resolved Stars in LBT-SONG

Cited by 3 publications

References 107 publications

The PAndAS View of the Andromeda Satellite System. III. Dwarf galaxy detection limits

The PAndAS View of the Andromeda Satellite System. III. Dwarf galaxy detection limits

Astrophysical Tests of Dark Matter Self-Interactions

Hubble Space Telescope Observations of NGC 253 Dwarf Satellites: Discovery of Three Ultra-faint Dwarf Galaxies

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