GHOSTS: the resolved stellar outskirts of massive disk galaxies

Roelof S. De Jong; A. C. Seth; E. F. Bell; T. M. Brown; J. S. Bullock; S. Courteau; J. J. Dalcanton; H. C. Ferguson; P. Goudfrooij; S. Holfeltz; C. Purcell; D. Radburn-Smith; D. Zucker

doi:10.1017/S1743921307008903

GHOSTS: the resolved stellar outskirts of massive disk galaxies

Roelof S. De Jong^*, A. C. Seth, E. F. Bell, T. M. Brown, J. S. Bullock, S. Courteau, J. J. Dalcanton, H. C. Ferguson, P. Goudfrooij, S. Holfeltz, C. Purcell, D. Radburn-Smith, D. Zucker

^*Corresponding author for this work

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

Abstract

We show initial results from our ongoing HST/ACS GHOSTS survey of the resolved stellar envelopes of 14 nearby, massive disk galaxies. In hierarchical galaxy formation the stellar halos and thick disks of galaxies are formed by accretion of minor satellites and therefore contain valuable information about the (early) assembly process of galaxies. We detect for the first time the very small halo of NGC 4244, a low mass edge-on galaxy. We find that massive galaxies have very extended halos, with equivalent surface brightnesses of 28-29 V-mag arcsec² at 20-30 kpc from the disk. The old RGB stars of the thick disk in the NGC 891 and NGC 4244 edge-on galaxies truncate at the same radius as the young thin disk stars, providing insights into the formation of both disk truncations and thick disks. We furthermore present the stellar populations of a very low surface brightness stream around M83, the first such a stream resolved into stars beyond those of the Milky Way and M31.

Original language	English
Pages (from-to)	503-504
Number of pages	2
Journal	Proceedings of the International Astronomical Union
Volume	2
Issue number	S241
DOIs	https://doi.org/10.1017/S1743921307008903
Publication status	Published - Dec 2006
Externally published	Yes

Keywords

Galaxies: evolution
Galaxies: halos
Galaxies: individual (M83, NGC 891, NGC 4244)
Galaxies: spiral
Galaxies: stellar content
Galaxies: structure

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10.1017/S1743921307008903

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De Jong, R. S., Seth, A. C., Bell, E. F., Brown, T. M., Bullock, J. S., Courteau, S., Dalcanton, J. J., Ferguson, H. C., Goudfrooij, P., Holfeltz, S., Purcell, C., Radburn-Smith, D., & Zucker, D. (2006). GHOSTS: the resolved stellar outskirts of massive disk galaxies. Proceedings of the International Astronomical Union, 2(S241), 503-504. https://doi.org/10.1017/S1743921307008903

@article{d2238428387e4d39a42300ed2140cc7c,

title = "GHOSTS: the resolved stellar outskirts of massive disk galaxies",

abstract = "We show initial results from our ongoing HST/ACS GHOSTS survey of the resolved stellar envelopes of 14 nearby, massive disk galaxies. In hierarchical galaxy formation the stellar halos and thick disks of galaxies are formed by accretion of minor satellites and therefore contain valuable information about the (early) assembly process of galaxies. We detect for the first time the very small halo of NGC 4244, a low mass edge-on galaxy. We find that massive galaxies have very extended halos, with equivalent surface brightnesses of 28-29 V-mag arcsec2 at 20-30 kpc from the disk. The old RGB stars of the thick disk in the NGC 891 and NGC 4244 edge-on galaxies truncate at the same radius as the young thin disk stars, providing insights into the formation of both disk truncations and thick disks. We furthermore present the stellar populations of a very low surface brightness stream around M83, the first such a stream resolved into stars beyond those of the Milky Way and M31.",

keywords = "Galaxies: evolution, Galaxies: halos, Galaxies: individual (M83, NGC 891, NGC 4244), Galaxies: spiral, Galaxies: stellar content, Galaxies: structure",

author = "{De Jong}, {Roelof S.} and Seth, {A. C.} and Bell, {E. F.} and Brown, {T. M.} and Bullock, {J. S.} and S. Courteau and Dalcanton, {J. J.} and Ferguson, {H. C.} and P. Goudfrooij and S. Holfeltz and C. Purcell and D. Radburn-Smith and D. Zucker",

year = "2006",

month = dec,

doi = "10.1017/S1743921307008903",

language = "English",

volume = "2",

pages = "503--504",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press (CUP)",

number = "S241",

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TY - JOUR

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T2 - the resolved stellar outskirts of massive disk galaxies

AU - De Jong, Roelof S.

AU - Seth, A. C.

AU - Bell, E. F.

AU - Brown, T. M.

AU - Bullock, J. S.

AU - Courteau, S.

AU - Dalcanton, J. J.

AU - Ferguson, H. C.

AU - Goudfrooij, P.

AU - Holfeltz, S.

AU - Purcell, C.

AU - Radburn-Smith, D.

AU - Zucker, D.

PY - 2006/12

Y1 - 2006/12

N2 - We show initial results from our ongoing HST/ACS GHOSTS survey of the resolved stellar envelopes of 14 nearby, massive disk galaxies. In hierarchical galaxy formation the stellar halos and thick disks of galaxies are formed by accretion of minor satellites and therefore contain valuable information about the (early) assembly process of galaxies. We detect for the first time the very small halo of NGC 4244, a low mass edge-on galaxy. We find that massive galaxies have very extended halos, with equivalent surface brightnesses of 28-29 V-mag arcsec2 at 20-30 kpc from the disk. The old RGB stars of the thick disk in the NGC 891 and NGC 4244 edge-on galaxies truncate at the same radius as the young thin disk stars, providing insights into the formation of both disk truncations and thick disks. We furthermore present the stellar populations of a very low surface brightness stream around M83, the first such a stream resolved into stars beyond those of the Milky Way and M31.

AB - We show initial results from our ongoing HST/ACS GHOSTS survey of the resolved stellar envelopes of 14 nearby, massive disk galaxies. In hierarchical galaxy formation the stellar halos and thick disks of galaxies are formed by accretion of minor satellites and therefore contain valuable information about the (early) assembly process of galaxies. We detect for the first time the very small halo of NGC 4244, a low mass edge-on galaxy. We find that massive galaxies have very extended halos, with equivalent surface brightnesses of 28-29 V-mag arcsec2 at 20-30 kpc from the disk. The old RGB stars of the thick disk in the NGC 891 and NGC 4244 edge-on galaxies truncate at the same radius as the young thin disk stars, providing insights into the formation of both disk truncations and thick disks. We furthermore present the stellar populations of a very low surface brightness stream around M83, the first such a stream resolved into stars beyond those of the Milky Way and M31.

KW - Galaxies: evolution

KW - Galaxies: halos

KW - Galaxies: individual (M83, NGC 891, NGC 4244)

KW - Galaxies: spiral

KW - Galaxies: stellar content

KW - Galaxies: structure

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DO - 10.1017/S1743921307008903

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JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

SN - 1743-9213

IS - S241

ER -

GHOSTS: the resolved stellar outskirts of massive disk galaxies

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Keywords

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