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[td][/td] [td]===Baryonic matter too sparse===[/td]
[td]===Baryonic matter too sparse===[/td] [td]One proposal is that the smaller halos do exist but that only a few of them end up becoming visible, because they are unable to acquire enough [[baryonic matter]] to form a visible dwarf galaxy.<ref>{{Cite journal |last1=Bullock |first1=James S. |last2=Boylan-Kolchin |first2=Michael |date=2017-08-18 |title=Small-Scale Challenges to the ΞCDM Paradigm |url=https://www.annualreviews.org/content/journals/10.1146/annurev-astro-091916-055313 |journal=Annual Review of Astronomy and Astrophysics |language=en |volume=55 |issue=Volume 55, 2017 |pages=343β387 |doi=10.1146/annurev-astro-091916-055313 |arxiv=1707.04256 |bibcode=2017ARA&A..55..343B |issn=0066-4146}}</ref> In support of this, in 2007 [[W. M. Keck Observatory|the Keck telescopes]] observed eight newly discovered ultra-faint Milky Way dwarf satellites of which six were around 99.9% dark matter (with a [[mass-to-light ratio]] of about 1,000).<ref>{{cite journal |author1=Simon, J.D. |author2=Geha, M.|author2-link= Marla Geha |title=The Kinematics of the ultra-faint Milky Way satellites: Solving the missing satellite problem |journal=The Astrophysical Journal |date=Nov 2007 |volume=670 |issue=1 |pages=313β331 |doi=10.1086/521816 |bibcode=2007ApJ...670..313S |arxiv=0706.0516|s2cid=9715950 }}</ref> Density profiles from 2022 suggest that dwarf galaxies have a constant-density core, though [[dark matter]] simulations suggest that there should be less baryon density. <ref>{{Citation |last1=Sales |first1=Laura V. |title=Baryonic solutions and challenges for cosmological models of dwarf galaxies |date=2022-06-10 |arxiv=2206.05295 |last2=Wetzel |first2=Andrew |last3=Fattahi |first3=Azadeh|journal=Nature Astronomy |volume=6 |issue=8 |page=897 |doi=10.1038/s41550-022-01689-w |bibcode=2022NatAs...6..897S }}</ref> [/td]
[td]One proposal is that the smaller halos do exist but that only a few of them end up becoming visible, because they are unable to acquire enough [[baryonic matter]] to form a visible dwarf galaxy.<ref>{{Cite journal |last1=Bullock |first1=James S. |last2=Boylan-Kolchin |first2=Michael |date=2017-08-18 |title=Small-Scale Challenges to the ΞCDM Paradigm |url=https://www.annualreviews.org/content/journals/10.1146/annurev-astro-091916-055313 |journal=Annual Review of Astronomy and Astrophysics |language=en |volume=55 |issue= |pages=343β387 |doi=10.1146/annurev-astro-091916-055313 |arxiv=1707.04256 |bibcode=2017ARA&A..55..343B |issn=0066-4146}}</ref> In support of this, in 2007 [[W. M. Keck Observatory|the Keck telescopes]] observed eight newly discovered ultra-faint Milky Way dwarf satellites of which six were around 99.9% dark matter (with a [[mass-to-light ratio]] of about 1,000).<ref>{{cite journal |author1=Simon, J.D. |author2=Geha, M.|author2-link= Marla Geha |title=The Kinematics of the ultra-faint Milky Way satellites: Solving the missing satellite problem |journal=The Astrophysical Journal |date=Nov 2007 |volume=670 |issue=1 |pages=313β331 |doi=10.1086/521816 |bibcode=2007ApJ...670..313S |arxiv=0706.0516|s2cid=9715950 }}</ref> Density profiles from 2022 suggest that dwarf galaxies have a constant-density core, though [[dark matter]] simulations suggest that there should be less baryon density. <ref>{{Citation |last1=Sales |first1=Laura V. |title=Baryonic solutions and challenges for cosmological models of dwarf galaxies |date=2022-06-10 |arxiv=2206.05295 |last2=Wetzel |first2=Andrew |last3=Fattahi |first3=Azadeh|journal=Nature Astronomy |volume=6 |issue=8 |page=897 |doi=10.1038/s41550-022-01689-w |bibcode=2022NatAs...6..897S }}</ref>[/td] [td][/td]
[td][/td] [td]===Early demise of young dwarfs===[/td]
[td]===Early demise of young dwarfs===[/td]
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[td][/td]Revision as of 08:14, 2 September 2025
[/td][td][/td] [td]===Baryonic matter too sparse===[/td]
[td]===Baryonic matter too sparse===[/td] [td]One proposal is that the smaller halos do exist but that only a few of them end up becoming visible, because they are unable to acquire enough [[baryonic matter]] to form a visible dwarf galaxy.<ref>{{Cite journal |last1=Bullock |first1=James S. |last2=Boylan-Kolchin |first2=Michael |date=2017-08-18 |title=Small-Scale Challenges to the ΞCDM Paradigm |url=https://www.annualreviews.org/content/journals/10.1146/annurev-astro-091916-055313 |journal=Annual Review of Astronomy and Astrophysics |language=en |volume=55 |issue=Volume 55, 2017 |pages=343β387 |doi=10.1146/annurev-astro-091916-055313 |arxiv=1707.04256 |bibcode=2017ARA&A..55..343B |issn=0066-4146}}</ref> In support of this, in 2007 [[W. M. Keck Observatory|the Keck telescopes]] observed eight newly discovered ultra-faint Milky Way dwarf satellites of which six were around 99.9% dark matter (with a [[mass-to-light ratio]] of about 1,000).<ref>{{cite journal |author1=Simon, J.D. |author2=Geha, M.|author2-link= Marla Geha |title=The Kinematics of the ultra-faint Milky Way satellites: Solving the missing satellite problem |journal=The Astrophysical Journal |date=Nov 2007 |volume=670 |issue=1 |pages=313β331 |doi=10.1086/521816 |bibcode=2007ApJ...670..313S |arxiv=0706.0516|s2cid=9715950 }}</ref> Density profiles from 2022 suggest that dwarf galaxies have a constant-density core, though [[dark matter]] simulations suggest that there should be less baryon density. <ref>{{Citation |last1=Sales |first1=Laura V. |title=Baryonic solutions and challenges for cosmological models of dwarf galaxies |date=2022-06-10 |arxiv=2206.05295 |last2=Wetzel |first2=Andrew |last3=Fattahi |first3=Azadeh|journal=Nature Astronomy |volume=6 |issue=8 |page=897 |doi=10.1038/s41550-022-01689-w |bibcode=2022NatAs...6..897S }}</ref> [/td]
[td]One proposal is that the smaller halos do exist but that only a few of them end up becoming visible, because they are unable to acquire enough [[baryonic matter]] to form a visible dwarf galaxy.<ref>{{Cite journal |last1=Bullock |first1=James S. |last2=Boylan-Kolchin |first2=Michael |date=2017-08-18 |title=Small-Scale Challenges to the ΞCDM Paradigm |url=https://www.annualreviews.org/content/journals/10.1146/annurev-astro-091916-055313 |journal=Annual Review of Astronomy and Astrophysics |language=en |volume=55 |issue= |pages=343β387 |doi=10.1146/annurev-astro-091916-055313 |arxiv=1707.04256 |bibcode=2017ARA&A..55..343B |issn=0066-4146}}</ref> In support of this, in 2007 [[W. M. Keck Observatory|the Keck telescopes]] observed eight newly discovered ultra-faint Milky Way dwarf satellites of which six were around 99.9% dark matter (with a [[mass-to-light ratio]] of about 1,000).<ref>{{cite journal |author1=Simon, J.D. |author2=Geha, M.|author2-link= Marla Geha |title=The Kinematics of the ultra-faint Milky Way satellites: Solving the missing satellite problem |journal=The Astrophysical Journal |date=Nov 2007 |volume=670 |issue=1 |pages=313β331 |doi=10.1086/521816 |bibcode=2007ApJ...670..313S |arxiv=0706.0516|s2cid=9715950 }}</ref> Density profiles from 2022 suggest that dwarf galaxies have a constant-density core, though [[dark matter]] simulations suggest that there should be less baryon density. <ref>{{Citation |last1=Sales |first1=Laura V. |title=Baryonic solutions and challenges for cosmological models of dwarf galaxies |date=2022-06-10 |arxiv=2206.05295 |last2=Wetzel |first2=Andrew |last3=Fattahi |first3=Azadeh|journal=Nature Astronomy |volume=6 |issue=8 |page=897 |doi=10.1038/s41550-022-01689-w |bibcode=2022NatAs...6..897S }}</ref>[/td] [td][/td]
[td][/td] [td]===Early demise of young dwarfs===[/td]
[td]===Early demise of young dwarfs===[/td]
Continue reading...
