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THE LARGEST GRAVITATIONAL LENS: MACS J0717.5+3745 ( z = 0.546)
- Source :
- The Astrophysical Journal. 707:L102-L106
- Publication Year :
- 2009
- Publisher :
- American Astronomical Society, 2009.
-
Abstract
- We identify 13 sets of multiply-lensed galaxies around MACS J0717.5+3745 ($z=0.546$), outlining a very large tangential critical curve of major axis $\sim2.8\arcmin$, filling the field of HST/ACS. The equivalent circular Einstein radius is $\theta_{e}= 55 \pm 3\arcsec$ (at an estimated source redshift of $z_{s}\sim2.5$), corresponding to $r_e\simeq 350\pm 20 kpc$ at the cluster redshift, nearly three times greater than that of A1689 ($r_e\simeq 140 kpc$ for $z_{s}=2.5$). The mass enclosed by this critical curve is very large, $7.4\pm 0.5 \times 10^{14}M_{\odot}$ and only weakly model dependent, with a relatively shallow mass profile within $r10\times$, is $\simeq 3.5\sq\arcmin$ for sources with $z\simeq 8$, making MACS J0717.5+3745 a compelling target for accessing faint objects at high redshift. We calculate that only one such cluster, with $\theta_{e}\ge 55\arcsec$, is predicted within $\sim 10^7$ Universes with $z\ge 0.55$, corresponding to a virial mass $\ge 3\times 10^{15} M_{\odot}$, for the standard $\Lambda CDM$ (WMAP5 parameters with $2\sigma$ uncertainties).<br />Comment: 5 pages, 5 figures, accepted to the ApJ Letters; title modified; minor changes
- Subjects :
- Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
FOS: Physical sciences
Astronomy and Astrophysics
Virial mass
Field (mathematics)
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Lambda
Critical curve
Redshift
Galaxy
Einstein radius
Gravitational lens
Space and Planetary Science
Astrophysics::Galaxy Astrophysics
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 707
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....8ce5bc33a4b2629f808897fb16cf93f0
- Full Text :
- https://doi.org/10.1088/0004-637x/707/1/l102