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researcher

D. Helfand

39 papers hereh-index 5313.7k citations380 works total

Matching runs newest-first, so older work may not be attached to this profile yet.

author position
  • first author3
  • middle author19
  • last author13

Across the 35 of 39 papers where every author was matched, so the position is known.

fields
  • astro-ph36
  • astro-ph.CO3

identity via Semantic Scholar / OpenAlex

activity
19952009
most citedTransient pulsed radio emission from a magnetar

449 citations · 1.2k across the 17 of their papers we have counts for

collaborators
Showing 2009Show all

3 papers · 1 filter

astro-ph.CO2009

Active Galaxies in the Sloan Digital Sky Survey III: from quasars to radio galaxies?

Pietro M. Reviglio, David J. Helfand

In this third of a series of papers concerning active galaxies in the FIRST and Sloan Digital Sky Surveys, we analyze the spectroscopic and radio properties of a sample of narrow-l…

astro-ph.CO2009★ 1 cited

Active Galaxies in the Sloan Digital Sky Survey II: galaxy and activity evolution

Pietro M. Reviglio, David J. Helfand

In this second paper of a series of papers based on the FIRST and SDSS surveys we investigate the evolution of galaxy morphology and nuclear activity in the look-back time of the S…

astro-ph.CO2009

Active Galaxies in the Sloan Digital Sky Survey I: The Spectroscopically Unremarkable Population of the Local Universe

Pietro M. Reviglio, David J. Helfand

In a series of papers based on the FIRST and Sloan Digital Sky Surveys (SDSS), we investigate the local population of star-forming galaxies and Active Galactic Nuclei (AGN) in orde…

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Not affiliated with arXiv. Researcher data from Semantic Scholar (ODC-BY) and OpenAlex.