A new resonance-like feature in the outer disc of the Milky Way

被引：12

作者：

Drimmel, R. ^{[1
]}

Khanna, S. ^{[1
]}

D'Onghia, E. ^{[2
]}

Tepper-Garcia, T. ^{[3
,4
]}

Bland-Hawthorn, J. ^{[3
,4
]}

Chemin, L. ^{[5
]}

Ripepi, V. ^{[6
]}

Romero-Gomez, M. ^{[7
,8
,9
]}

Ramos, P. ^{[7
,8
,9
,10
]}

Poggio, E. ^{[1
,11
]}

Andrae, R. ^{[12
]}

Blomme, R. ^{[13
]}

Cantat-Gaudin, T. ^{[12
]}

Castro-Ginard, A. ^{[14
]}

Clementini, G. ^{[15
]}

Figueras, F. ^{[7
,8
,9
]}

Fouesneau, M. ^{[12
]}

Fremat, Y. ^{[13
]}

Lobel, A. ^{[13
]}

Marshall, D. ^{[16
]}

Muraveva, T. ^{[15
]}

机构：

[1] INAF Osservatorio Astrofisico Torino, Via Osservatorio 20, I-10025 Pino Torinese, TO, Italy

[2] Univ Wisconsin Madison, Dept Astron, 475 North Charter St, Madison, WI 53706 USA

[3] Univ Sydney, Sydney Inst Astron, Sch Phys, Phys Rd,Camperdown, Sydney, NSW 2006, Australia

[4] Ctr Excellence All Sky Astrophys Three Dimens ASTR, Stromlo, ACT 2611, Australia

[5] Univ Antofagasta, Ctr Astron CITEVA, Ave Angamos 601, Antofagasta 1270300, Chile

[6] INAF Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy

[7] Univ Barcelona IEEC UB, Inst Ciencies Cosmos ICCUB, Marti & Franques 1, Barcelona 08028, Spain

[8] Univ Barcelona UB, Dept Fis Quant & Astrofis FQA, C Marti & Franques 1, Barcelona 08028, Spain

[9] Inst Estudis Espacials Catalunya IEEC, C Gran Capita 2-4, Barcelona 08034, Spain

[10] Natl Astron Observ Japan, 2 Chome-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[11] Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France

[12] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[13] Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium

[14] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands

[15] INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy

[16] Univ Toulouse, IRAP, CNRS, UPS,CNES, 9 Ave Colonel Roche,BP 44346, F-31028 Toulouse 4, France

来源：

ASTRONOMY & ASTROPHYSICS | 2023年 / 670卷

基金：

澳大利亚研究理事会; 欧盟地平线“2020”;

关键词：

Galaxy; kinematics and dynamics; structure; disk; stars; variables; Cepheids; GAIA DR2 LINKING; GALACTIC BAR; LINDBLAD RESONANCE; GALAH SURVEY; DATA RELEASE; IDENTIFYING RESONANCES; VELOCITY FLUCTUATIONS; SPIRAL STRUCTURE; VERTICAL WAVES; PHASE-SPACE;

D O I：

10.1051/0004-6361/202244605

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Modern astrometric and spectroscopic surveys have revealed a wealth of structure in the phase space of stars in the Milky Way, with evidence of resonance features and non-equilibrium processes. Using the third Gaia data release, we present evidence of a new resonance-like feature in the outer disc of the Milky Way. The feature is most evident in the angular momentum distribution of the young classical Cepheids, a population for which we can derive accurate distances over much of the Galactic disc. We then searched for similar features in the outer disc using a much larger sample of red giant stars, as well as a compiled list of over 31 million stars with spectroscopic line-of-sight velocity measurements. While much less evident in these two older samples, the distribution of stars in action-configuration space suggests that resonance features are present here as well. The position of the feature in action-configuration space suggests that the new feature may be related to the Galactic bar, but other possibilities are discussed.

引用

页数：13

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