Zobrazeno 1 - 10
of 64
pro vyhledávání: '"de Vries, W. H."'
Autor:
MacLeod, C. L., Ivezić, Ž., Kochanek, C. S., Kozłowski, S., Kelly, B. C., Bullock, E., Kimball, A., Sesar, B., Westman, D., Brooks, K., Gibson, R., Becker, A. C., de Vries, W. H.
Publikováno v:
Astrophysical Journal 721 (2010) 1014-1033
We model the time variability of ~9,000 spectroscopically confirmed quasars in SDSS Stripe 82 as a damped random walk. Using 2.7 million photometric measurements collected over 10 years, we confirm the results of Kelly et al. (2009) and Koz{\l}owski
Externí odkaz:
http://arxiv.org/abs/1004.0276
Autor:
Chornock, R., Filippenko, A. V., Li, W., Marion, G. H., Foley, R. J., Modjaz, M., Rafelski, M., Becker, G. D., de Vries, W. H., Garnavich, P., Jorgenson, R. A., Lynch, D. K., Malec, A. L., Moran, E. C., Murphy, M. T., Rudy, R. J., Russell, R. W., Silverman, J. M., Steele, T. N., Stockton, A., Wolfe, A. M., Woodward, C. E.
Supernova (SN) 2008ax in NGC 4490 was discovered within hours after shock breakout, presenting the rare opportunity to study a core-collapse SN beginning with the initial envelope-cooling phase immediately following shock breakout. We present an exte
Externí odkaz:
http://arxiv.org/abs/1001.2775
We investigate the radio emission of ~185,000 quiescent (optically unclassifiable) galaxies selected from the Sloan Digital Sky Survey (SDSS). By median-stacking FIRST cutouts centered on the optically-selected sources, we are able to reach flux dens
Externí odkaz:
http://arxiv.org/abs/0806.3986
Autor:
Modjaz, Maryam, Li, W., Butler, N., Chornock, R., Perley, D., Blondin, S., Bloom, J. S., Filippenko, A. V., Kirshner, R. P., Kocevski, D., Poznanski, D., Hicken, M., Foley, R. J., Stringfellow, G. S., Berlind, P., Navascues, D. Barrado y, Blake, C. H., Bouy, H., Brown, W. R., Challis, P., Chen, H., de Vries, W. H., Dufour, P., Falco, E., Friedman, A., Ganeshalingam, M., Garnavich, P., Holden, B., Illingworth, G., Liebert, J., Marion, G. H., Lee, N., Olivier, S. S., Prochaska, J. X., Silverman, J. M., Smith, N., Starr, D., Steele, T. N., Stockton, A., Williams, G. G., Wood-Vasey, W. M.
Publikováno v:
Astrophys.J.702:226-248,2009
We present extensive early photometric (ultraviolet through near-infrared) and spectroscopic (optical and near-infrared) data on supernova (SN) 2008D as well as X-ray data analysis on the associated Swift/X-ray transient (XRT) 080109. Our data span a
Externí odkaz:
http://arxiv.org/abs/0805.2201
Publikováno v:
Astron.J.134:457-465,2007
We investigate faint radio emission from low- to high-luminosity Active Galactic Nuclei (AGN) selected from the Sloan Digital Sky Survey (SDSS). Their radio properties are inferred by co-adding large ensembles of radio image cut-outs from the FIRST s
Externí odkaz:
http://arxiv.org/abs/0704.2074
Publikováno v:
Astrophys.J.662:744-749,2007
We investigate the ellipticity of the point-spread function (PSF) produced by imaging an unresolved source with a telescope, subject to the effects of atmospheric turbulence. It is important to quantify these effects in order to understand the errors
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703102
AIMS: Search for star formation regions in the hosts of potentially young radio galaxies (Gigahertz Peaked Spectrum and Compact Steep Spectrum sources). METHODS: Near-UV imaging with the Hubble Space Telescope Advanced Camera for Surveys.} RESULTS: W
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701619
Autor:
Asztalos, S., de Vries, W. H., Rosenberg, L. J, Treadway, T., Burke, D., Claver, C., Saha, A., Puxley, P.
Publikováno v:
Astrophys.J.659:69-75,2007
Cosmic shear holds great promise for a precision independent measurement of $\Omega\rm_m$, the mass density of the universe relative to the critical density. The signal is expected to be weak, so a thorough understanding of systematic effects is cruc
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701157
* Aims. Identify optical counterparts, address uncertain identifications and measure previously unknown redshifts of the host galaxies of candidate GPS radio sources, and study their stellar populations. * Methods. Long slit spectroscopy and deep opt
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611600
We present near ultraviolet imaging with the Hubble Space Telescope Advanced Camera for Surveys, targeting young radio galaxies (Gigahertz Peaked Spectrum and Compact Steep Spectrum sources), in search of star formation regions in their hosts. We fin
Externí odkaz:
http://arxiv.org/abs/astro-ph/0512057