Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Margoniner, V."'
Autor:
Abate, Alexandra, Wittman, D., Margoniner, V. E., Bridle, S. L., Gee, Perry, Tyson, J. Anthony, Antonio, Ian P. Dell
Publikováno v:
Astrophys.J.702:603-613,2009
We present weak lensing mass estimates of seven shear-selected galaxy cluster candidates from the Deep Lens Survey. The clusters were previously identified as mass peaks in convergence maps of 8.6 sq. deg of R band imaging, and followed up with X-ray
Externí odkaz:
http://arxiv.org/abs/0904.2185
We examine the impact of non-Gaussian photometry errors on photometric redshift performance. We find that they greatly increase the scatter, but this can be mitigated to some extent by incorporating the correct noise model into the photometric redshi
Externí odkaz:
http://arxiv.org/abs/0709.3330
Autor:
Margoniner, V. E., Wittman, D. M.
We investigate the impact of photometric signal-to-noise (S/N) on the precision of photometric redshifts in multi-band imaging surveys, using both simulations and real data. We simulate the optical 4-band (BVRz) Deep Lens Survey (DLS, Wittman etal 20
Externí odkaz:
http://arxiv.org/abs/0707.2403
Autor:
Fassnacht, C. D., McKean, J. P., Koopmans, L. V. E., Treu, T., Blandford, R. D., Auger, M. W., Jeltema, T. E., Lubin, L. M., Margoniner, V. E., Wittman, D.
Publikováno v:
Astrophys.J.651:667-675, 2006
We report the serendipitous discovery of two strong gravitational lens candidates (ACS J160919+6532 and ACS J160910+6532) in deep images obtained with the Advanced Camera for Surveys on the Hubble Space Telescope, each less than 40 arcsec from the pr
Externí odkaz:
http://arxiv.org/abs/astro-ph/0603445
Autor:
Wittman, D., Dell'Antonio, I. P., Hughes, J. P., Margoniner, V. E., Tyson, J. A., Cohen, J. G., Norman, D.
Publikováno v:
Astrophys.J.643:128-143,2006
We present the first sample of galaxy clusters selected on the basis of their weak gravitational lensing shear. The shear induced by a cluster is a function of its mass profile and its redshift relative to the background galaxies being sheared; in co
Externí odkaz:
http://arxiv.org/abs/astro-ph/0507606
We present a weak lensing analysis of the high-redshift cluster Cl 1604+4304. At z=0.90, this is the highest-redshift cluster yet detected with weak lensing. It is also one of a sample of high-redshift, optically-selected clusters whose X-ray tempera
Externí odkaz:
http://arxiv.org/abs/astro-ph/0407563
Autor:
Becker, A. C., Wittman, D. M., Boeshaar, P. C., Clocchiatti, A., Dell'Antonio, I. P., Frail, D. A., Halpern, J., Margoniner, V. E., Norman, D., Tyson, J. A., Schommer, R. A.
Publikováno v:
Astrophys.J. 611 (2004) 418-433
We report on the methodology and first results from the Deep Lens Survey transient search. We utilize image subtraction on survey data to yield all sources of optical variability down to 24th magnitude. Images are analyzed immediately after acquisiti
Externí odkaz:
http://arxiv.org/abs/astro-ph/0404416
Weak gravitational lensing has the potential to select clusters independently of their baryon content, dynamical state, and star formation history. We present steps toward the first shear-selected sample of clusters, from the Deep Lens Survey (DLS),
Externí odkaz:
http://arxiv.org/abs/astro-ph/0303381
Autor:
Wittman, D., Margoniner, V. E., Tyson, J. A., Cohen, J. G., Dell'Antonio, I. P., Becker, A. C.
Publikováno v:
Astrophys.J. 597 (2003) 218-224
We report the weak lensing discovery, spectroscopic confirmation, and weak lensing tomography of a massive cluster of galaxies at $z=0.68$, demonstrating that shear selection of clusters works at redshifts high enough to be cosmologically interesting
Externí odkaz:
http://arxiv.org/abs/astro-ph/0210120
Autor:
Wittman, D., Tyson, J. A., Dell'Antonio, I. P., Becker, A. C., Margoniner, V. E., Cohen, J., Norman, D., Loomba, D., Squires, G., Wilson, G., Stubbs, C., Hennawi, J., Spergel, D., Boeshaar, P., Clocchiatti, A., Hamuy, M., Bernstein, G., Gonzalez, A., Guhathakurta, P., Hu, W., Seljak, U., Zaritsky, D.
The Deep Lens Survey (DLS) is a deep BVRz' imaging survey of seven 2x2 degree fields, with all data to be made public. The primary scientific driver is weak gravitational lensing, but the survey is also designed to enable a wide array of other astrop
Externí odkaz:
http://arxiv.org/abs/astro-ph/0210118