GAUGING THE DARK MATTER FRACTION IN AN L* S0 GALAXY AT z=0.47 THROUGH GRAVITATIONAL LENSING FROM DEEP HUBBLE SPACE TELESCOPE/ADVANCED CAMERA FOR SURVEYS IMAGING

被引：14

作者：

Covone, G. ^{[1
,2
,3
]}

Paolillo, M. ^{[1
,3
]}

Napolitano, N. R. ^{[2
]}

Capaccioli, M. ^{[1
,4
]}

Longo, G. ^{[1
]}

Kneib, J. -P. ^{[5
]}

Jullo, E. ^{[5
,6
]}

Richard, J. ^{[7
]}

Khovanskaya, O. ^{[8
]}

Sazhin, M. ^{[8
]}

Grogin, N. A. ^{[9
]}

Schreier, E. ^{[10
]}

机构：

[1] Univ Naples Federico II, Dipartimento Sci Fis, Naples, Italy

[2] Osserv Astron Capodimonte, INAF, I-80131 Naples, Italy

[3] Ist Nazl Fis Nucl, I-80125 Naples, Italy

[4] INAF VSTCeN, Naples, Italy

[5] OAMP, LAM CNRS, Marseille, France

[6] ESO, Santiago, Chile

[7] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[8] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow, Russia

[9] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

[10] Associated Univ Inc, Washington, DC 20036 USA

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 691卷 / 01期

关键词：

dark matter; galaxies: bulges; galaxies: structure; gravitational lensing; TO-LIGHT RATIOS; FUNDAMENTAL PLANE; ELLIPTICAL GALAXIES; DENSITY PROFILE; ACS SURVEY; EVOLUTION; MASS; STELLAR; FIELD; CATALOG;

D O I：

10.1088/0004-637X/691/1/531

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analyze a new gravitational lens OAC-GL J1223-1239, serendipitously found in a deep I-814-band image of the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS). The lens is an L*, edge-on S0 galaxy at z(1) = 0.4656. The gravitational arc has a radius of 0 ''.42 similar or equal to 1.74 h(-1) kpc. We have determined the total mass and the dark matter (DM) fraction within the Einstein radius R-E as a function of the lensed source redshift, which is presently unknown. For z(s) similar to 1.3, which is in the middle of the redshift range plausible for the source according to some external constraints, we find the central velocity dispersion to be similar to 180 km s(-1). With this value, close to that obtained by means of the Faber-Jackson relation at the lens redshift, we compute a 30% DM fraction within R-E (given the uncertainty in the source redshift, the allowed range for the DM fraction is 25%-35% in our lensing model). When compared with the galaxies in the local universe, the lensing galaxy OAC-GL J1223-1239 seems to fall in the transition regime between massive, DM-dominated galaxies and lower-mass, DM-deficient systems.

引用

页码：531 / 536

页数：6

共 42 条

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