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  1. No Access

    Article

    Strong gravitational lensing by AGNs as a probe of the quasar–host relations in the distant Universe

    The tight correlations found between the mass of supermassive black holes and the luminosities, stellar masses and velocity dispersions of their host galaxies are often interpreted as a sign of their co-evolut...

    Martin Millon, Frédéric Courbin, Aymeric Galan, Dominique Sluse… in Nature Astronomy (2023)

  2. Article

    Author Correction: A fast radio burst source at a complex magnetized site in a barred galaxy

    H. Xu, J. R. Niu, P. Chen, K. J. Lee, W. W. Zhu, S. Dong, B. Zhang, J. C. Jiang… in Nature (2022)

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  3. No Access

    Article

    A fast radio burst source at a complex magnetized site in a barred galaxy

    Fast radio bursts (FRBs) are highly dispersed, millisecond-duration radio bursts1–3. Recent observations of a Galactic FRB4–8 suggest that at least some FRBs originate from magnetars, but the origin of cosmologic...

    H. Xu, J. R. Niu, P. Chen, K. J. Lee, W. W. Zhu, S. Dong, B. Zhang, J. C. Jiang… in Nature (2022)

  4. No Access

    Article

    A fast radio burst localized to a massive galaxy

    Intense, millisecond-duration bursts of radio waves (named fast radio bursts) have been detected from beyond the Milky Way1. Their dispersion measures—which are greater than would be expected if they had propagat...

    V. Ravi, M. Catha, L. D’Addario, S. G. Djorgovski, G. Hallinan, R. Hobbs, J. Kocz… in Nature (2019)

  5. No Access

    Article

    A possible close supermassive black-hole binary in a quasar with optical periodicity

    A search of a data set of light curves for 247,000 known, spectroscopically confirmed quasars with a temporal baseline of about 9 years reveals a strong, smooth periodic signal in the optical variability of qu...

    Matthew J. Graham, S. G. Djorgovski, Daniel Stern, Eilat Glikman, Andrew J. Drake… in Nature (2015)

  6. No Access

    Article

    Data challenges of time domain astronomy

    Astronomy has been at the forefront of the development of the techniques and methodologies of data intensive science for over a decade with large sky surveys and distributed efforts such as the Virtual Observa...

    Matthew J. Graham, S. G. Djorgovski, Ashish Mahabal… in Distributed and Parallel Databases (2012)

  7. No Access

    Article

    New cataclysmic variable 1RXS J073346.0+261933 in Gemini

    In the course of our search for the optical identifications of ROSAT X-ray sources, we have found a highly variable object with a very unusual behavior on long time scales, rare color indices, and a high X-ray...

    D. V. Denisenko, A. J. Drake, S. G. Djorgovski, T. V. Kryachko… in Astronomy Letters (2011)

  8. No Access

    Chapter and Conference Paper

    Exploring the Use of Virtual Worlds as a Scientific Research Platform: The Meta-Institute for Computational Astrophysics (MICA)

    We describe the Meta-Institute for Computational Astrophysics (MICA), the first professional scientific organization based exclusively in virtual worlds (VWs). The goals of MICA are to explore the utility of t...

    S. G. Djorgovski, P. Hut, S. McMillan, E. Vesperini… in Facets of Virtual Environments (2010)

  9. No Access

    Article

    The bright optical afterglow of the nearby γ-ray burst of 29 March 2003

    Past studies of cosmological γ-ray bursts (GRBs) have been hampered by their extreme distances, resulting in faint afterglows. A nearby GRB could potentially shed much light on the origin of these events, but ...

    P. A. Price, D. W. Fox, S. R. Kulkarni, B. A. Peterson, B. P. Schmidt… in Nature (2003)

  10. No Access

    Article

    Early optical emission from the γ-ray burst of 4 October 2002

    Observations of the long-lived emission—or ‘afterglow’—of long-duration γ-ray bursts place them at cosmological distances, but the origin of these energetic explosions remains a mystery. Observations of optica...

    D. W. Fox, S. Yost, S. R. Kulkarni, K. Torii, T. Kato, H. Yamaoka, M. Sako… in Nature (2003)

  11. No Access

    Chapter

    The Roles of Small Telescopes in a Virtual Observatory Environment

    The advent of the Virtual Observatory (VO) concept signals a paradigm shift in the way astronomy will be done in the era of information abundance and ubiquitous networking. Small telescopes will be playing a n...

    S. G. Djorgovski in The Future of Small Telescopes in the New Millennium (2003)

  12. No Access

    Chapter and Conference Paper

    Challenges for Cluster Analysis in a Virtual Observatory

    There has been an unprecedented and continuing growth in the volume, quality, and complexity of astronomical data sets over the past few years, mainly through large digital sky surveys. Virtual Observatory (VO...

    S. G. Djorgovski, R. Brunner, A. Mahabal… in Statistical Challenges in Astronomy (2003)

  13. No Access

    Article

    The evolutionary history of early-type galaxies as derived from the fundamental plane

    The fundamental plane (FP) scaling relations and their evolution are a powerful tool for studying the global properties of early-type galaxies and their evolutionary history. The form of the FP, as derived by ...

    M.A. Pahre, S.G. Djorgovski, R.R. De Carvalho in Astrophysics and Space Science (2001)

  14. No Access

    Chapter and Conference Paper

    The GRB Host Galaxies and Redshifts

    Based in part on the observations obtained at the W.M. Keck Observatory, operated by the California Association for Research in Astronomy, a scientific partnership among Caltech, the Univ. of California and NASA; and with the NASA/ESA Hubble Space Telescope, operated by the AURA, Inc., under a contract with NASA.

    Observations of GRB host galaxies and their environments in general can provide valuable clues about the nature of progenitors. Bursts are associated with faint,

    S. G. Djorgovski, S. R. Kulkarni, J. S. Bloom… in Gamma-Ray Bursts in the Afterglow Era (2001)

  15. No Access

    Chapter and Conference Paper

    Exploration of Large Digital Sky Surveys

    We review some of the scientific opportunities and technical challenges posed by the exploration of the large digital sky surveys, in the context of a Virtual Observatory (VO). The VO paradigm will profoundly ...

    S. G. Djorgovski, R. J. Brunner, A. A. Mahabal, S. C. Odewahn… in Mining the Sky (2001)

  16. No Access

    Article

    The unusual afterglow of the γ-ray burst of 26 March 1998 as evidence for a supernova connection

    Cosmic γ-ray bursts have now been firmly established as one of the most powerful phenomena in the Universe, releasing almost the rest-mass energy of a neutron star within the space of a few seconds (ref. 1). The...

    J. S. Bloom, S. R. Kulkarni, S. G. Djorgovski, A. C. Eichelberger, P. Côté… in Nature (1999)

  17. No Access

    Article

    The afterglow, redshift and extreme energetics of the γ-ray burst of 23 January 1999

    Long-lived emission, known as afterglow, has now been detected from about a dozen γ-ray bursts. Distance determinations place the bursts at cosmological distances, with redshifts, z, ranging from ∼1 to 3. The ene...

    S. R. Kulkarni, S. G. Djorgovski, S. C. Odewahn, J. S. Bloom, R. R. Gal… in Nature (1999)

  18. No Access

    Article

    Identification of a host galaxy at redshift z = 3.42 for the γ-ray burst of 14 December 1997

    Knowledge of the properties of γ-ray bursts has increased substantially following recent detections of counterparts at X-ray, optical and radio wavelengths. But the nature of the underlying physical mechanism ...

    S. R. Kulkarni, S. G. Djorgovski, A. N. Ramaprakash, R. Goodrich, J. S. Bloom… in Nature (1998)

  19. No Access

    Article

    The energetic afterglow of the γ-ray burst of 14 December 1997

    The discovery of fading but relatively long-lived X-ray emission1 accompanying γ-ray bursts has revolutionized the study of these objects. This ‘afterglow’ is most easily explained by models2,3,4 similar to those...

    A. N. Ramaprakash, S. R. Kulkarni, D. A. Frail, C. Koresko, M. Kuchner… in Nature (1998)

  20. No Access

    Chapter and Conference Paper

    Cataloging of the Digitized POSS-II: Initial Scientific Results

    The Second Palomar Sky Survey (POSS-II) is now nearing completion. It will cover the entire northern sky with 894 fields (6.5° square) at 5° spacings, with no gaps in the coverage. Plates are taken in three ba...

    S. G. Djorgovski, R. R. De Carvalho… in New Horizons from Multi-Wavelength Sky Sur… (1998)

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