J/A+A/631/A40 Cosmic Horseshoe (J1148+1930) Ha and OIII spectra (Schuldt+, 2019)
Inner dark matter distribution of the Cosmic Horseshoe (J1148+1930) with
gravitational lensing and dynamics.
Schuldt S., Chirivi G., Suyu S.H., Yildirim A., Sonnenfeld A., Halkola A.,
Lewis G.F.
<Astron. Astrophys. 631, A40 (2019)>
=2019A&A...631A..40S 2019A&A...631A..40S (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; Galaxies, spectra
Keywords: gravitational lensing: strong - dark matter - Galaxy: structure -
galaxies: kinematics and dynamics - Galaxy: halo
Abstract:
We present a detailed analysis of the inner mass structure of the
Cosmic Horseshoe (J1148+1930) strong gravitational lens system
observed with the Hubble Space Telescope (HST) Wide Field Camera 3
(WFC3). In addition to the spectacular Einstein ring, this systems
shows a radial arc. We obtained the redshift of the radial arc counter
image zs,r=1.961±0.001 from Gemini observations. To disentangle
the dark and luminous matter, we consider three different profiles for
the dark matter distribution: a power-law profile, the NFW, and a
generalized version of the NFW profile. For the luminous matter
distribution, we base it on the observed light distribution that is
fitted with three components: a point mass for the central light
component resembling an active galactic nucleus, and the remaining two
extended light components scaled by a constant M/L. To constrain the
model further, we include published velocity dispersion measurements
of the lens galaxy and perform a self-consistent lensing and
axisymmetric Jeans dynamical modeling. Our model fits well to the
observations including the radial arc, independent of the dark matter
profile. Depending on the dark matter profile, we get a dark matter
fraction between 60% and 70%. With our composite mass model we find
that the radial arc helps to constrain the inner dark matter
distribution of the Cosmic Horseshoe independently of the dark matter
profile.
Description:
Files Halpha_1dspec and OIII_1dspec contain the not flux normalized 1D
spectrum of the Halpha and OIII line, respectively, of the radial arc
counter image of the Cosmic Horseshoe observation. The first extension
contains the 1D spectrum. Extension 2 contains a smoothed version of
it. Extension 3 is the variance. The wavelength scale is linear.
Objects:
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RA (2000) DE Designation(s)
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11 48 33.10 +19 30 03.2 Cosmic Horseshoe = CSWA 1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 160 2 List of fits spectra
fits/* . 2 Individual fits spectra
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension (J2000)
4- 5 I2 min RAm Right Ascension (J2000)
7- 11 F5.2 s RAs Right Ascension (J2000)
12 A1 --- DE- Declination sign (J2000)
13- 14 I2 deg DEd Declination (J2000)
16- 17 I2 arcmin DEm Declination (J2000)
19- 22 F4.1 arcsec DEs Declination (J2000)
24- 25 I2 --- Nx Number of pixels along X-axis
27- 33 F7.1 0.1nm blambda Lower value of wavelength interval
35- 41 F7.1 0.1nm Blambda Upper value of wavelength interval
43- 49 F7.5 0.1nm dlambda Wavelength resolution
51- 52 I2 Kibyte size Size of FITS file
54- 71 A18 --- FileName Name of FITS file, in subdirectory fits
73-160 A88 --- Title Title of the FITS file
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Acknowledgements:
Stefan Schuldt, stefan.schuldt(at)tum.de
(End) Stefan Schuldt [MPA, Germany], Patricia Vannier [CDS] 22-Aug-2019