Major substructure in the M31 outer halo: the South-West Cloud

被引：20

作者：

Bate, N. F. ^{[1
]}

Conn, A. R. ^{[1
]}

McMonigal, B. ^{[1
]}

Lewis, G. F. ^{[1
]}

Martin, N. F. ^{[2
,3
]}

McConnachie, A. W. ^{[4
]}

Veljanoski, J. ^{[5
]}

Mackey, A. D. ^{[6
]}

Ferguson, A. M. N. ^{[5
]}

Ibata, R. A. ^{[2
]}

Irwin, M. J. ^{[7
]}

Fardal, M. ^{[8
]}

Huxor, A. P. ^{[9
]}

Babul, A. ^{[10
]}

机构：

[1] Univ Sydney, Sydney Inst Astron, Sch Phys, Sydney, NSW 2006, Australia

[2] Univ Strasbourg, Observ Astron, CNRS, F-67000 Strasbourg, France

[3] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[4] NRC Herzberg Inst Astrophys, Victoria, BC V9E 2E7, Canada

[5] Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland

[6] Australian Natl Univ, RSAA, Mt Stromlo Observ, Weston, ACT 2611, Australia

[7] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[8] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[9] Heidelberg Univ, Astron Rechen Inst, D-69120 Heidelberg, Germany

[10] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 437卷 / 04期

基金：

美国国家科学基金会; 澳大利亚研究理事会;

关键词：

galaxies: individual: M31; Local Group; galaxies: stellar content; GIANT BRANCH TIP; GLOBULAR-CLUSTER SYSTEM; DWARF GALAXY; SAGITTARIUS DWARF; ANDROMEDA GALAXY; 3-DIMENSIONAL STRUCTURE; STELLAR OVERDENSITY; BAYESIAN-APPROACH; LOCAL GROUP; STREAM;

D O I：

10.1093/mnras/stt2139

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We undertake the first detailed analysis of the stellar population and spatial properties of a diffuse substructure in the outer halo of M31. The South-West Cloud lies at a projected distance of similar to 100 kpc from the centre of M31 and extends for at least similar to 50 kpc in projection. We use Pan-Andromeda Archaeological Survey photometry of red giant branch stars to determine a distance to the South-West Cloud of 793(-45)(+45) kpc. The metallicity of the cloud is found to be [Fe/H] = -1.3 +/- 0.1. This is consistent with the coincident globular clusters PAndAS-7 and PAndAS-8, which have metallicities determined using an independent technique of [Fe/H] = -1.35 +/- 0.15. We measure a brightness for the Cloud of M-V = -12.1 mag; this is similar to 75 per cent of the luminosity implied by the luminosity-metallicity relation. Under the assumption that the South-West Cloud is the visible remnant of an accreted dwarf satellite, this suggests that the progenitor object was amongst M31's brightest dwarf galaxies prior to disruption.

引用

页码：3362 / 3372

页数：11

共 55 条

[1] A step toward the calibration of the red giant branch tip as a standard candle [J].

Bellazzini, M ;

Ferraro, FR ;

Pancino, E .

ASTROPHYSICAL JOURNAL, 2001, 556 (02) :635-640

[2]

Bellazzini M., 2008, MMSAI, V79, P440

[3] An orphan in the "Field of Streams" [J].

Belokurov, V. ;

Evans, N. W. ;

Irwin, M. J. ;

Lynden-Bell, D. ;

Yanny, B. ;

Vidrih, S. ;

Gilmore, G. ;

Seabroke, G. ;

Zucker, D. B. ;

Wilkinson, M. I. ;

Hewett, P. C. ;

Bramich, D. M. ;

Fellhauer, M. ;

Newberg, H. J. ;

Wyse, R. F. G. ;

Beers, T. C. ;

Bell, E. F. ;

Barentine, J. C. ;

Brinkmann, J. ;

Cole, N. ;

Pan, K. ;

York, D. G. .

ASTROPHYSICAL JOURNAL, 2007, 658 (01) :337-344

[4] A DEEP PHOTOMETRIC LOOK AT TWO OF ANDROMEDA'S DWARF SPHEROIDALS: X AND XVII [J].

Brasseur, Crystal M. ;

Martin, Nicolas F. ;

Rix, Hans-Walter ;

Irwin, Mike ;

Ferguson, Annette M. N. ;

McConnachie, Alan W. ;

de Jong, Jelte .

ASTROPHYSICAL JOURNAL, 2011, 729 (01)

[5] Tracing galaxy formation with stellar halos. I. Methods [J].

Bullock, JS ;

Johnston, KV .

ASTROPHYSICAL JOURNAL, 2005, 635 (02) :931-949

[6] KINEMATICS AND METALLICITIES IN THE BOOTES III STELLAR OVERDENSITY: A DISRUPTED DWARF GALAXY? [J].

Carlin, Jeffrey L. ;

Grillmair, Carl J. ;

Munoz, Ricardo R. ;

Nidever, David L. ;

Majewski, Steven R. .

ASTROPHYSICAL JOURNAL LETTERS, 2009, 702 (01) :L9-L13

[7] A KINEMATIC STUDY OF THE ANDROMEDA DWARF SPHEROIDAL SYSTEM [J].

Collins, Michelle L. M. ;

Chapman, Scott C. ;

Rich, R. Michael ;

Ibata, Rodrigo A. ;

Martin, Nicolas F. ;

Irwin, Michael J. ;

Bate, Nicholas F. ;

Lewis, Geraint F. ;

Penarrubia, Jorge ;

Arimoto, Nobuo ;

Casey, Caitlin M. ;

Ferguson, Annette M. N. ;

Koch, Andreas ;

McConnachie, Alan W. ;

Tanvir, Nial .

ASTROPHYSICAL JOURNAL, 2013, 768 (02)

[8] THE THREE-DIMENSIONAL STRUCTURE OF THE M31 SATELLITE SYSTEM; STRONG EVIDENCE FOR AN INHOMOGENEOUS DISTRIBUTION OF SATELLITES [J].

Conn, A. R. ;

Lewis, G. F. ;

Ibata, R. A. ;

Parker, Q. A. ;

Zucker, D. B. ;

McConnachie, A. W. ;

Martin, N. F. ;

Valls-Gabaud, D. ;

Tanvir, N. ;

Irwin, M. J. ;

Ferguson, A. M. N. ;

Chapman, S. C. .

ASTROPHYSICAL JOURNAL, 2013, 766 (02)

[9] A BAYESIAN APPROACH TO LOCATING THE RED GIANT BRANCH TIP MAGNITUDE. II. DISTANCES TO THE SATELLITES OF M31 [J].

Conn, A. R. ;

Ibata, R. A. ;

Lewis, G. F. ;

Parker, Q. A. ;

Zucker, D. B. ;

Martin, N. F. ;

McConnachie, A. W. ;

Irwin, M. J. ;

Tanvir, N. ;

Fardal, M. A. ;

Ferguson, A. M. N. ;

Chapman, S. C. ;

Valls-Gabaud, D. .

ASTROPHYSICAL JOURNAL, 2012, 758 (01)

[10] A BAYESIAN APPROACH TO LOCATING THE RED GIANT BRANCH TIP MAGNITUDE. I. [J].

Conn, A. R. ;

Lewis, G. F. ;

Ibata, R. A. ;

Parker, Q. A. ;

Zucker, D. B. ;

McConnachie, A. W. ;

Martin, N. F. ;

Irwin, M. J. ;

Tanvir, N. ;

Fardal, M. A. ;

Ferguson, A. M. N. .

ASTROPHYSICAL JOURNAL, 2011, 740 (02)

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