Zobrazeno 1 - 10
of 78
pro vyhledávání: '"Narayanan, Vijay K."'
Autor:
Feng, Zhanpeng, Zhang, Shiliang, Takezoe, Rinyoichi, Hu, Wenze, Chandraker, Manmohan, Li, Li-Jia, Narayanan, Vijay K., Wang, Xiaoyu
Active learning is an important technology for automated machine learning systems. In contrast to Neural Architecture Search (NAS) which aims at automating neural network architecture design, active learning aims at automating training data selection
Externí odkaz:
http://arxiv.org/abs/2207.13339
Autor:
Pentericci, Laura, Rix, Hans W., Prada, Francisco, Fan, Xiaohui, Strauss, Michael A., Schneider, Donald P., Grebel, Eva K., Harbeck, Daniel, Brinkmann, Jon, Narayanan, Vijay K.
Publikováno v:
Astron.Astrophys.410:75,2003; Astron.Astrophys.410:75-82,2003
We present J-H-K' photometry for a sample of 45 high redshift quasars found by the Sloan Digital Sky Survey. The sample was originally selected on the basis of optical colors and spans a redshift range from 3.6 to 5.03. Our photometry reflects the re
Externí odkaz:
http://arxiv.org/abs/astro-ph/0308178
Autor:
Fan, Xiaohui, Strauss, Michael A., Schneider, Donald P., Becker, Robert H., White, Richard L., Haiman, Zoltan, Gregg, Michael, Pentericci, Laura, Grebe, Eva K., Narayanan, Vijay K., Loh, Yeong-Shang, Richards, Gordon T., Gunn, James E., Lupton, Robert H., Knapp, Gillian R., Ivezic, Zeljko, Brandt, W. N.
Publikováno v:
Astron.J.125:1649,2003
We present the discovery of three new quasars at z>6 in 1300 deg^2 of SDSS imaging data, J114816.64+525150.3 (z=6.43), J104845.05+463718.3 (z=6.23) and J163033.90+401209.6 (z=6.05). The first two objects have weak Ly alpha emission lines; their redsh
Externí odkaz:
http://arxiv.org/abs/astro-ph/0301135
Publikováno v:
Astron.J. 124 (2002) 1810
We describe the algorithm that selects the main sample of galaxies for spectroscopy in the Sloan Digital Sky Survey from the photometric data obtained by the imaging survey. Galaxy photometric properties are measured using the Petrosian magnitude sys
Externí odkaz:
http://arxiv.org/abs/astro-ph/0206225
Autor:
Fan, Xiaohui, Narayanan, Vijay K., Strauss, Michael A., White, Richard L., Becker, Robert H., Pentericci, Laura, Rix, Hans-Walter
Publikováno v:
Astron.J.123:1247-1257,2002
We study the process of cosmic reionization and estimate the ionizing background in the IGM using the Lyman series absorption in the spectra of the four quasars at 5.7
Externí odkaz:
http://arxiv.org/abs/astro-ph/0111184
Autor:
Blakeslee, John P., Lucey, John R., Tonry, John L., Hudson, Michael J., Narayanan, Vijay K., Barris, Brian J.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 330 (2002) 443
We compare two methods for deriving distances to early-type galaxies: fundamental plane (FP) and surface brightness fluctuations (SBF) distances for 170 galaxies. A third set of distances is provided by predictions derived from the density field of t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0111183
Autor:
Becker, Robert H., Fan, Xiaohui, White, Richard L., Strauss, Michael A., Narayanan, Vijay K., Lupton, Robert H., Gunn, James E., Annis, James, Bahcall, Neta A., Brinkmann, J., Connolly, A. J., Csabai, Istvan, Czarapata, Paul C., Doi, Mamoru, Heckman, Timothy M., Hennessy, G. S., Ivezic, Zeljko, Knapp, G. R., Lamb, Don Q., McKay, Timothy A., Munn, Jeffrey A., Nash, Thomas, Nichol, Robert, Pier, Jeffrey R., Richards, Gordon T., Schneider, Donald P., Stoughton, Chris, Szalay, Alexander S., Thakar, Anirudda R., York, D. G.
Publikováno v:
Astron.J. 122 (2001) 2850
We present moderate resolution Keck spectroscopy of quasars at z=5.82, 5.99 and 6.28, discovered by the Sloan Digital Sky Survey (SDSS). We find that the Ly Alpha absorption in the spectra of these quasars evolves strongly with redshift. To z~5.7, th
Externí odkaz:
http://arxiv.org/abs/astro-ph/0108097
Autor:
Fan, Xiaohui, Narayanan, Vijay K., Lupton, Robert H., Strauss, Michael A., Knapp, Gillian R., Becker, Robert H., White, Richard L., Pentericci, Laura, Leggett, S. K., Haiman, Zoltan, Gunn, James E., Ivezic, Zeljko, Schneider, Donald P.
Publikováno v:
Astron.J. 122 (2001) 2833
We present the results from a survey of i-dropout objects selected from ~1550 deg^2 of multicolor imaging data from the Sloan Digital Sky Survey, to search for luminous quasars at z>5.8. Objects with i*-z*>2.2 and z*<20.2 are selected, and follow-up
Externí odkaz:
http://arxiv.org/abs/astro-ph/0108063
Autor:
Dodelson, Scott, Narayanan, Vijay K., Tegmark, Max, Scranton, Ryan, Budavari, Tamas, Connolly, Andrew, Csabai, Istvan, Eisenstein, Daniel, Frieman, Joshua A., Gunn, James E., Hui, Lam, Jain, Bhuvnesh, Johnston, David, Kent, Stephen, Loveday, Jon, Nichol, Robert C., O'Connell, Liam, Scoccimarro, Roman, Sheth, Ravi K., Stebbins, Albert, Strauss, Michael A., Szalay, Alexander S., Szapudi, István, Vogeley, Michael S., Zehavi, Idit
Publikováno v:
Astrophys.J.572:140-156,2001
Early photometric data from the Sloan Digital Sky Survey (SDSS) contain angular positions for 1.5 million galaxies. In companion papers, the angular correlation function $w(\theta)$ and 2D power spectrum $C_l$ of these galaxies are presented. Here we
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107421
Publikováno v:
Astron.J. 122 (2001) 1861-1874
We study the optical colors of 147,920 galaxies brighter than g* = 21, observed in five bands by the Sloan Digital Sky Survey (SDSS) over ~100 sq. deg. of high Galactic latitude sky along the Celestial Equator. The distribution of galaxies in the g*-
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107201