PAndAS in the mist: The stellar and gaseous mass within the halos of M31 and M33

Geraint F. Lewis; Robert Braun; Alan W. McConnachie; Michael J. Irwin; Rodrigo A. Ibata; Scott C. Chapman; Annette M.N. Ferguson; Nicolas F. Martin; Mark Fardal; John Dubinski; Larry Widrow; A. Dougal MacKey; Arif Babul; Nial R. Tanvir; Michael Rich

doi:10.1088/0004-637X/763/1/4

PAndAS in the mist: The stellar and gaseous mass within the halos of M31 and M33

Geraint F. Lewis^*, Robert Braun, Alan W. McConnachie, Michael J. Irwin, Rodrigo A. Ibata, Scott C. Chapman, Annette M.N. Ferguson, Nicolas F. Martin, Mark Fardal, John Dubinski, Larry Widrow, A. Dougal MacKey, Arif Babul, Nial R. Tanvir, Michael Rich

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

Large-scale surveys of the prominent members of the Local Group have provided compelling evidence for the hierarchical formation of massive galaxies, revealing a wealth of substructure that is thought to be the debris from ancient and ongoing accretion events. In this paper, we compare two extant surveys of the M31-M33 subgroup of galaxies: the Pan-Andromeda Archaeological Survey of the stellar structure, and a combination of observations of the H I gaseous content, detected at 21 cm. Our key finding is a marked lack of spatial correlation between these two components on all scales, with only a few potential overlaps between stars and gas. The paucity of spatial correlation significantly restricts the analysis of kinematic correlations, although there does appear to be H I kinematically associated with the Giant Stellar Stream where it passes the disk of M31. These results demonstrate that different processes must significantly influence the dynamical evolution of the stellar and H I components of substructures, such as ram pressure driving gas away from a purely gravitational path. Detailed modeling of the offset between the stellar and gaseous substructures will provide a determination of the properties of the gaseous halos of M31 and M33.

Original language	English
Article number	4
Journal	Astrophysical Journal
Volume	763
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/763/1/4
Publication status	Published - 20 Jan 2013

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Lewis, G. F., Braun, R., McConnachie, A. W., Irwin, M. J., Ibata, R. A., Chapman, S. C., Ferguson, A. M. N., Martin, N. F., Fardal, M., Dubinski, J., Widrow, L., MacKey, A. D., Babul, A., Tanvir, N. R., & Rich, M. (2013). PAndAS in the mist: The stellar and gaseous mass within the halos of M31 and M33. Astrophysical Journal, 763(1), Article 4. https://doi.org/10.1088/0004-637X/763/1/4

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title = "PAndAS in the mist: The stellar and gaseous mass within the halos of M31 and M33",

abstract = "Large-scale surveys of the prominent members of the Local Group have provided compelling evidence for the hierarchical formation of massive galaxies, revealing a wealth of substructure that is thought to be the debris from ancient and ongoing accretion events. In this paper, we compare two extant surveys of the M31-M33 subgroup of galaxies: the Pan-Andromeda Archaeological Survey of the stellar structure, and a combination of observations of the H I gaseous content, detected at 21 cm. Our key finding is a marked lack of spatial correlation between these two components on all scales, with only a few potential overlaps between stars and gas. The paucity of spatial correlation significantly restricts the analysis of kinematic correlations, although there does appear to be H I kinematically associated with the Giant Stellar Stream where it passes the disk of M31. These results demonstrate that different processes must significantly influence the dynamical evolution of the stellar and H I components of substructures, such as ram pressure driving gas away from a purely gravitational path. Detailed modeling of the offset between the stellar and gaseous substructures will provide a determination of the properties of the gaseous halos of M31 and M33.",

keywords = "Local Group, dark matter, galaxies: abundances, galaxies: dwarf, galaxies: kinematics and dynamics",

author = "Lewis, {Geraint F.} and Robert Braun and McConnachie, {Alan W.} and Irwin, {Michael J.} and Ibata, {Rodrigo A.} and Chapman, {Scott C.} and Ferguson, {Annette M.N.} and Martin, {Nicolas F.} and Mark Fardal and John Dubinski and Larry Widrow and MacKey, {A. Dougal} and Arif Babul and Tanvir, {Nial R.} and Michael Rich",

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doi = "10.1088/0004-637X/763/1/4",

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TY - JOUR

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T2 - The stellar and gaseous mass within the halos of M31 and M33

AU - Lewis, Geraint F.

AU - Braun, Robert

AU - McConnachie, Alan W.

AU - Irwin, Michael J.

AU - Ibata, Rodrigo A.

AU - Chapman, Scott C.

AU - Ferguson, Annette M.N.

AU - Martin, Nicolas F.

AU - Fardal, Mark

AU - Dubinski, John

AU - Widrow, Larry

AU - MacKey, A. Dougal

AU - Babul, Arif

AU - Tanvir, Nial R.

AU - Rich, Michael

PY - 2013/1/20

Y1 - 2013/1/20

N2 - Large-scale surveys of the prominent members of the Local Group have provided compelling evidence for the hierarchical formation of massive galaxies, revealing a wealth of substructure that is thought to be the debris from ancient and ongoing accretion events. In this paper, we compare two extant surveys of the M31-M33 subgroup of galaxies: the Pan-Andromeda Archaeological Survey of the stellar structure, and a combination of observations of the H I gaseous content, detected at 21 cm. Our key finding is a marked lack of spatial correlation between these two components on all scales, with only a few potential overlaps between stars and gas. The paucity of spatial correlation significantly restricts the analysis of kinematic correlations, although there does appear to be H I kinematically associated with the Giant Stellar Stream where it passes the disk of M31. These results demonstrate that different processes must significantly influence the dynamical evolution of the stellar and H I components of substructures, such as ram pressure driving gas away from a purely gravitational path. Detailed modeling of the offset between the stellar and gaseous substructures will provide a determination of the properties of the gaseous halos of M31 and M33.

AB - Large-scale surveys of the prominent members of the Local Group have provided compelling evidence for the hierarchical formation of massive galaxies, revealing a wealth of substructure that is thought to be the debris from ancient and ongoing accretion events. In this paper, we compare two extant surveys of the M31-M33 subgroup of galaxies: the Pan-Andromeda Archaeological Survey of the stellar structure, and a combination of observations of the H I gaseous content, detected at 21 cm. Our key finding is a marked lack of spatial correlation between these two components on all scales, with only a few potential overlaps between stars and gas. The paucity of spatial correlation significantly restricts the analysis of kinematic correlations, although there does appear to be H I kinematically associated with the Giant Stellar Stream where it passes the disk of M31. These results demonstrate that different processes must significantly influence the dynamical evolution of the stellar and H I components of substructures, such as ram pressure driving gas away from a purely gravitational path. Detailed modeling of the offset between the stellar and gaseous substructures will provide a determination of the properties of the gaseous halos of M31 and M33.

KW - Local Group

KW - dark matter

KW - galaxies: abundances

KW - galaxies: dwarf

KW - galaxies: kinematics and dynamics

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U2 - 10.1088/0004-637X/763/1/4

DO - 10.1088/0004-637X/763/1/4

M3 - Article

SN - 0004-637X

VL - 763

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 4

ER -

PAndAS in the mist: The stellar and gaseous mass within the halos of M31 and M33

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