THE UNUSUAL VERTICAL MASS DISTRIBUTION OF NGC 4013 SEEN THROUGH THE SPITZER SURVEY OF STELLAR STRUCTURE IN GALAXIES (S4G)

被引：16

作者：

Comeron, Sebastien ^{[1
]}

Elmegreen, Bruce G. ^{[2
]}

Knapen, Johan H. ^{[3
,4
]}

Sheth, Kartik ^{[5
]}

Hinz, Joannah L. ^{[6
]}

Regan, Michael W. ^{[7
]}

Gil de Paz, Armando ^{[8
]}

Munoz-Mateos, Juan-Carlos ^{[5
]}

Menendez-Delmestre, Karin ^{[9
]}

Seibert, Mark ^{[9
]}

Kim, Taehyun ^{[5
]}

Mizusawa, Trisha ^{[5
]}

Laurikainen, Eija ^{[10
,11
]}

Salo, Heikki ^{[10
]}

Laine, Jarkko ^{[10
]}

Athanassoula, E. ^{[12
]}

Bosma, Albert ^{[12
]}

Buta, Ronald J. ^{[13
]}

Gadotti, Dimitri A. ^{[14
]}

Ho, Luis C. ^{[9
]}

Holwerda, Benne ^{[15
]}

Schinnerer, Eva ^{[16
]}

Zaritsky, Dennis ^{[6
]}

机构：

[1] Korea Astron & Space Sci Inst, Taejon 305348, South Korea

[2] IBM TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA

[3] Inst Astrofis Canarias, E-38200 San Cristobal la Laguna, Spain

[4] Univ La Laguna, Dept Astrofis, E-38205 Tenerife, Spain

[5] NAASC, Natl Radio Astron Observ, Charlottesville, VA 22903 USA

[6] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[7] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[8] Univ Complutense Madrid, Dept Astrofis, E-28040 Madrid, Spain

[9] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA

[10] Univ Oulu, Astron Div, Dept Phys Sci, FIN-90014 Oulu, Finland

[11] Univ Turku, Finnish Ctr Astron ESO FINCA, FI-21500 Piikkio, Finland

[12] Univ Aix Marseille 1, CNRS, UMR6110, LAM, F-13388 Marseille 20, France

[13] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

[14] European So Observ, Santiago 19, Chile

[15] Estec, European Space Agcy, NL-2200 AG Noordwijk, Netherlands

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

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 738卷 / 02期

基金：

美国国家科学基金会;

关键词：

galaxies: individual (NGC 4013); galaxies: photometry; galaxies: spiral; galaxies: structure; PRODIGIOUS WARP; THICK DISKS; GAS-RICH; SPIRAL GALAXIES; GALACTIC DISKS; PHOTOMETRY; SIMULATIONS; KINEMATICS; EVOLUTION; ORIGIN;

D O I：

10.1088/2041-8205/738/2/L17

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

NGC 4013 is a nearby Sb edge-on galaxy known for its "prodigious" Hi warp and its "giant" tidal stream. Previous work on this unusual object shows that it cannot be fitted satisfactorily by a canonical thin+thick disk structure. We have produced a new decomposition of NGC 4013, considering three stellar flattened components (thin+thick disk plus an extra and more extended component) and one gaseous disk. All four components are considered to be gravitationally coupled and isothermal. To do so, we have used the 3.6 mu m images from the Spitzer Survey of Stellar Structure in Galaxies. We find evidence for NGC 4013 indeed having a thin and a thick disk and an extra flattened component. This smooth and extended component (scale height z(EC) similar to 3 kpc) could be interpreted as a thick disk or as a squashed ellipsoidal halo and contains similar to 20% of the total mass of all three stellar components. We argue it is unlikely to be related to the ongoing merger or due to the off-plane stars from a warp in the other two disk components. Instead, we favor a scenario in which the thick disk and the extended component were formed in a two-stage process, in which an initially thick disk has been dynamically heated by a merger soon enough in the galaxy history to have a new thick disk formed within it.

引用

页数：6

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