{
  "id": "1805.06624",
  "version": "v1",
  "published": "2018-05-17T07:16:21.000Z",
  "updated": "2018-05-17T07:16:21.000Z",
  "title": "Strong-lensing Measurement of the Mass-density Profile out to 3 Effective Radii for $z \\sim 0.5$ Early-type Galaxies",
  "authors": [
    "Rui Li",
    "Yiping Shu",
    "Jiangcheng Wang"
  ],
  "comment": "7 pages, 4 figures, 1 table",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We obtain the total mass-density profiles out to three effective radii for a sample of 63 intermediate-redshift early-type galaxies (ETGs) through a joint analysis of strong gravitational lensing and stellar dynamics. The sample is compiled from three galaxy-scale strong-lens surveys, including the Baryon Oscillation Spectroscopic Survey (BOSS) Emission-Line Lens Survey (BELLS), BELLS for GALaxy-Ly EmitteR sYstems (BELLS GALLERY) Survey, and Strong Lensing Legacy Survey (SL2S). The lens redshifts of the sample have a mean value of $0.52$, but the source redshifts span a wide range from $0.8$ to $3.5$, which leads to a wide range of Einstein radii up to three effective radii. We find that: (1) the total mass distribution is very close to isothermal one with the average logarithmic density slope $\\langle\\gamma\\rangle=2.000_{-0.032}^{+0.033}$ ($68\\%$CL) and intrinsic scatter $\\delta=0.180_{-0.028}^{+0.032}$, similar with previous work. (2) we normalize the Einstein radius by the effective radius to study whether the slope $\\gamma$ evolutes along radius for a fixed galaxy. We find the density profile would be steeper with increasing radius. Therefore, We conclude that the total mass-density slope have a slight increasing trend along radius for a fixed galaxy, which is consistent with previous numerical simulation depending on galactic wind and AGN feedback",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-05-17T07:16:21.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "effective radius",
      "early-type galaxies",
      "strong-lensing measurement",
      "wide range",
      "einstein radius"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}