Bauer, Anne, Baltay, Charles, Coppi, Paolo, Donalek, Ciro, Drake, Andrew, Djorgovski, S. G., ...
We identify 3113 highly variable objects in 7200 deg^2 of the Palomar-QUEST (PQ) Survey, which each varied by more than 0.4 mag simultaneously in two broadband optical filters on timescales from...
Bauer, Anne, Baltay, Charles, Coppi, Paolo, Donalek, Ciro, Drake, Andrew, Djorgovski, S. G., ...
We identify 3,113 highly variable objects in 7,200 square degrees of the Palomar-QUEST Survey, which each varied by more than 0.4 magnitudes simultaneously in two broadband optical filters on...
Binary Quasars at High Redshift I: 24 New Quasar Pairs at z ~ 3-4 (2009)
Hennawi, Joseph F., Myers, Adam D., Shen, Yue, Strauss, Michael A., Djorgovski, S. G., Fan, Xiaohui, ...
The clustering of quasars on small scales yields fundamental constraints on models of quasar evolution and the buildup of supermassive black holes. This paper describes the first systematic survey to...
Binary Quasars at High Redshift II: Sub-Mpc Clustering at z ~ 3-4 (2009)
Shen, Yue, Hennawi, Joseph F., Shankar, Francesco, Myers, Adam D., Strauss, Michael A., Djorgovski, S. G., ...
We present measurements of the small-scale (0.1
An exploratory search for z ≳ 6 quasars in the UKIDSS early data release (2008)
Glikman, Eilat, Eigenbrod, Alexander, Djorgovski, S. G., Meylan, Georges, Thompson, David, Mahabal, Ashish, ...
We conducted an exploratory search for quasars at z ~ 6-8, using the Early Data Release (EDR) from the United Kingdom Infrared Deep Sky Survey (UKIDSS) cross-matched to panoramic optical imagery....
An Exploratory Search for z~6 Quasars in the UKIDSS Early Data Release (2008)
Glikman, Eilat, Eigenbrod, Alexander, Djorgovski, S. G., Meylan, Georges, Thompson, David, Mahabal, Ashish, ...
We conducted an exploratory search for quasars at z~ 6 - 8, using the Early Data Release from United Kingdom Infrared Deep Sky survey (UKIDSS) cross-matched to panoramic optical imagery. High...
Discovery of two spectroscopically peculiar, low-luminosity quasars at z ~ 4 (2007)
Glikman, Eilat, Djorgovski, S. G., Stern, Daniel, Bogosavljević, Milan, Mahabal, Ashish
We report the discovery of two low-luminosity quasars at z ~ 4, both of which show prominent N iv] λ1486 emission. This line is extremely rare in quasar spectra at any redshift; detecting it in two...
Discovery of Two Spectroscopically Peculiar, Low-Luminosity Quasars at z~4 (2007)
Glikman, Eilat, Djorgovski, S. G., Stern, Daniel, Bogosavljevic, Milan, Mahabal, Ashish
We report the discovery of two low-luminosity quasars at z~4, both of which show prominent N IV] 1486A emission. This line is extremely rare in quasar spectra at any redshift; detecting it in two out...
Object detection in multi-epoch data (2006)
Babu, G. Jogesh, Mahabal, Ashish, Djorgovski, S. G., Williams, R.
In astronomy multiple images are frequently obtained at the same position of the sky for follow-up co-addition as it helps one go deeper and look for fainter objects. With large scale panchromatic...
Grist : grid-based data mining for astronomy (2006)
Jacob, Joseph C., Katz, Daniel S., Miller, Craig D., Walia, Harshpreet, Williams, Roy, Djorgovski, S. George, ...
The Grist project is developing a grid-technology based system as a research environment for astronomy with massive and complex datasets. This knowledge extraction system will consist of a library of...
Grist: Grid-based Data Mining for Astronomy (2005)
Jacob, Joseph C., Katz, Daniel S., Miller, Craig D., Walia, Harshpreet, Williams, Roy, Djorgovski, S. George, ...
The Grist project is developing a grid-technology based system as a research environment for astronomy with massive and complex datasets. This knowledge extraction system will consist of a library of...
Grist: Grid-based Data Mining for Astronomy (2004)
Jacob, Joseph C., Williams, Roy, Babu, Jogesh, Djorgovski, S. George, Graham, Matthew J., Katz, Daniel S., ...
The Grist project (http://grist.caltech.edu/) is developing a grid-technology based system as a research environment for astronomy with massive and complex datasets. This knowledge extraction system...
Palomar-QUEST: A case study in designing sky surveys in the VO era (2004)
Graham, Matthew J., Williams, Roy, Djorgovski, S. G., Mahabal, Ashish, Baltay, Charles, Rabinowitz, Dave, ...
The advent of wide-area multicolour synoptic sky surveys is leading to data sets unprecedented in size, complexity and data through- put. VO technology offers a way to exploit these to the full but...
Palomar-QUEST: A case study in designing sky surveys in the VO era (2004)
Graham, Matthew J., Williams, Roy, Djorgovski, S. G., Mahabal, Ashish, Baltay, Charles, Rabinowitz, Dave, ...
The advent of wide-area multicolour synoptic sky surveys is leading to data sets unprecedented in size, complexity and data throughput. VO technology offers a way to exploit these to the full but...
A Limit on the Number of Isolated Neutron Stars Detected in the ROSAT Bright Source Catalog (2003)
Rutledge, Robert E., Fox, Derek W., Bogosavljevic, Milan, Mahabal, Ashish
The challenge in searching for non-radio-pulsing isolated neutron stars (INSs) is in excluding association with objects in the very large error boxes (~13", 1 sigma radius) typical of sources from...
Effective Radii and Color Gradients in Radio Galaxies (1999)
Mahabal, Ashish, Kembhavi, Ajit, McCarthy, Patrick J. P.
We present de Vaucouleurs' effective radii in B and R bands for a sample of Molonglo Reference Catalogue radio galaxies and a control sample of normal galaxies. We use the ratio of the scale lengths...
A Dust Lane in the Radio galaxy 3C270 (1995)
Mahabal, Ashish, Kembhavi, Ajit, Bhat, P. N.
We present broad band surface photometry of the radio galaxy 3C270 (NGC~4261). We find a distinct dust lane in the $V-R$ image of the galaxy, and determine its orientation and size. We use the major...
Using R-based VOStat as a Low-Resolution Spectrum Analysis Tool
We describe here an online software suite VOStat written mainly for the Virtual Observatory, a novel structure in which astronomers share terabyte scale data. Written mostly in the public-domain...