DH
David J. Helfand
astro-phastro-ph.COastro-ph.GAastro-ph.HEastro-ph.IM
On Valency
published · living versionsW_x64xxy9j·v1 · currentpublished
The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
with Fiona A. Harrison, William W. Craig, Finn E. Christensen, Charles J. Hailey +75
1 version
W_5nms86zb·v1published
Preprints & journals
60 papers in the corpus · 1977–2026Evidence for Atomic Absorption Features in the High Resolution X-ray Spectrum of the Neutron Star in Puppis A2603.14146v1 · John Groger, Frits Paerels, Slavko Bogdanov et al.2026 · 2 citationsarXiv
The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission1301.7307v1 · Fiona A. Harrison, William W. Craig, Finn E. Christensen et al.2013 · 2,233 citationsarXivon Valency
Variable Radio Sources in the Galactic Plane1005.1572v1 · Robert H. Becker, David J. Helfand, Richard L. White et al.2010 · 35 citations2010AJ....140..157B
The Chandra ACIS Survey of M33: X-ray, Optical and Radio Properties of the Supernova Remnants1002.1839v1 · Knox S. Long, William P. Blair, P. Frank Winkler et al.2010 · 119 citationsarXiv
A Comparison of X-ray and Mid-Infrared Selection of Obscured AGN0911.2448v1 · Megan E. Eckart, Ian D. McGreer, Daniel Stern et al.2009 · 68 citationsAstrophys.J.708:584-597,2010
Radio-Selected Quasars in the Sloan Digital Sky Survey0909.4091v1 · Ian D. McGreer, David J. Helfand (Columbia), Richard L. White (STScI)2009 · 34 citationsarXiv
Exploring the Optical Transient Sky with the Palomar Transient Factory0906.5355v1 · Arne Rau, Shrinivas R. Kulkarni, Nicholas M. Law et al.2009 · 736 citationsPubl.Astron.Soc.Pac.121:1334-1351,2009on Valency
Active Galaxies in the Sloan Digital Sky Survey III: from quasars to radio galaxies?0904.0190v1 · Pietro M. Reviglio, David J. Helfand2009 · 0 citationsarXiv
Active Galaxies in the Sloan Digital Sky Survey II: galaxy and activity evolution0903.0634v1 · Pietro M. Reviglio, David J. Helfand2009 · 1 citationarXiv
Active Galaxies in the Sloan Digital Sky Survey I: The Spectroscopically Unremarkable Population of the Local Universe0902.1766v1 · Pietro M. Reviglio, David J. Helfand2009 · 0 citationsarXiv
Chandra ACIS Survey of M33 (ChASeM33): A First Look0709.4211v1 · Paul P. Plucinsky, Benjamin Williams, Knox S. Long et al.2007 · 48 citationsarXiv
Observations of X-rays and Thermal Dust Emission from the Supernova Remnant Kes 750706.1909v1 · T. D. Morton, P. Slane, K. J. Borkowski et al.2007 · 40 citationsAstrophys.J.667:219-225,2007
Star-Formation in Low Radio Luminosity AGN from the Sloan Digital Sky Survey0704.2074v1 · W. H. de Vries, J. A. Hodge, R. H. Becker et al.2007 · 28 citationsAstron.J.134:457-465,2007
VLBA measurement of the transverse velocity of the magnetar XTE J1810-197astro-ph/0703336v1 · D. J. Helfand, S. Chatterjee, W. F. Brisken et al.2007 · 69 citationsAstrophys.J.662:1198-1203,2007
The magnetar XTE J1810-197: variations in torque, radio flux density and pulse profile morphologyastro-ph/0610685v2 · F. Camilo, I. Cognard, S. M. Ransom et al.2006 · 123 citationsAstrophys.J.663:497-504,2007
A Direct Upper Limit on the Density of Cosmological Dust from the Absence of an X-ray Scattering Halo around the z=4.3 QSO 1508+5714astro-ph/0609589v1 · A. O. Petric, G. A. Telis, F. Paerels et al.2006 · 14 citationsAstrophys.J.651:41-45,2006
Transient pulsed radio emission from a magnetar.16929292 · Camilo, Fernando, Ransom, Scott M, Halpern, Jules P et al.2006 · 434 citationsNature. 2006;442(7105):892-5
On radio-bright Active Galactic Nuclei in a complete Spectroscopic Redshift Surveyastro-ph/0607392v1 · Pietro Reviglio, David J. Helfand2006 · 11 citationsAstrophys.J.650:717-728,2006
Signals from the Noise: Image Stacking for Quasars in the FIRST Surveyastro-ph/0607335v2 · Richard L. White, David J. Helfand, Robert H. Becker et al.2006 · 214 citationsAstrophys.J.654:99-114,2006
Discovery of a z=6.1 Radio-Loud Quasar in the NDWFSastro-ph/0607278v2 · Ian D. McGreer, Robert H. Becker, David J. Helfand et al.2006 · 87 citationsAstrophys.J.652:157-162,2006
The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) Program. III. Optical Spectroscopyastro-ph/0603556v1 · Megan E. Eckart, Daniel Stern, David J. Helfand et al.2006 · 65 citationsarXiv
A Near-Infrared Spectral Template for Quasarsastro-ph/0511640v1 · Eilat Glikman, David J. Helfand, Richard L. White2005 · 203 citationsAstrophys.J.640:579-591,2006
MAGPIS: A Multi-Array Galactic Plane Imaging Surveyastro-ph/0510468v1 · David J. Helfand, Robert H. Becker, Richard L. White et al.2005 · 3 citationsAIP Conf.Proc.840:102-104,2006
Discovery of Radio Emission from Transient Anomalous X-ray Pulsar XTE J1810-197astro-ph/0508534v1 · J.P. Halpern, E.V. Gotthelf, R.H. Becker et al.2005 · 90 citationsAstrophys.J.632:L29-L32,2005
A New Radio Catalog of Compact HII Regions in the Milky Way II. The 1.4 GHz Dataastro-ph/0503425v1 · U. Giveon, R.H. Becker, D.J. Helfand et al.2005 · 37 citationsAstron.J.130:156-164,2005
A New Catalog of Radio Compact HII Regions in the Milky Wayastro-ph/0410052v2 · Uriel Giveon (UC Davis), Robert H. Becker (UC Davis & LLNL), David J. Helfand et al.2004 · 61 citationsarXiv
The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) Program: II. Optical Imagingastro-ph/0409012v1 · Megan E. Eckart, Elise S. Laird, Daniel Stern et al.2004 · 16 citationsarXiv
Weak Lensing by Large-Scale Structure with the FIRST Radio Surveyastro-ph/0408548v1 · Tzu-Ching Chang, Alexandre Refregier, David J. Helfand (Columbia)2004 · 62 citationsAstrophys.J. 617 (2004) 794-810
A Galaxy at z = 6.545 and Constraints on the Epoch of Reionizationastro-ph/0407409v1 · Daniel Stern, Sarah A. Yost, Megan E. Eckart et al.2004 · 76 citationsAstrophys.J. 619 (2005) 12-18
New Constraints on the Structure and Evolution of the Pulsar Wind Nebula 3C 58astro-ph/0405380v2 · Patrick Slane, David J. Helfand, Eric van der Swaluw et al.2004 · 167 citationsAstrophys.J. 616 (2004) 403-413
X-ray, Radio, and Optical Observations of the Putative Pulsar in the Supernova Remnant CTA 1astro-ph/0404312v1 · J.P. Halpern, E.V. Gotthelf, F. Camilo et al.2004 · 73 citationsAstrophys.J. 612 (2004) 398-407
X-ray source populations in the Galactic Planeastro-ph/0403304v1 · A. D. P. Hands, R. S. Warwick, M. G. Watson et al.2004 · 75 citationsMon.Not.Roy.Astron.Soc. 351 (2004) 31
FIRST-2MASS Sources Below the APM Detection Threshold: A Population of Highly Reddened Quasarsastro-ph/0402386v1 · Eilat Glikman, Michael D. Gregg, Mark Lacy et al.2004 · 101 citationsAstrophys.J. 607 (2004) 60-75
Optical Properties of faint FIRST Variable Radio Sourcesastro-ph/0402117v1 · W. H. de Vries, R. H. Becker, R. L. White et al.2004 · 44 citationsarXiv
The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) Program: I. Characteristics of the Hard X-Ray Sampleastro-ph/0306610v1 · Fiona A. Harrison, Megan E. Eckart, Peter H. Mao et al.2003 · 59 citationsAstrophys.J.596:944-956,2003
An X-ray Image of the Composite SNR G16.7+0.1astro-ph/0304302v1 · David J. Helfand, Marcel A. Agueros, E. V. Gotthelf2003 · 16 citationsAstrophys.J. 592 (2003) 941-946
An I-Band-Selected Sample of Radio-Emitting Quasars: Evidence for a Large Population of Red Quasarsastro-ph/0304028v1 · Richard L. White, David J. Helfand, Robert H. Becker et al.2003 · 64 citationsAstron.J. 126 (2003) 706
New Constraints on Neutron Star Cooling from Chandra Observations of 3C58astro-ph/0204151v1 · Patrick Slane, David J. Helfand, Stephen S. Murray2002 · 140 citationsarXiv
The Reddest Quasars II. A gravitationally-lensed FeLoBAL quasarastro-ph/0203065v1 · M. Lacy, M. Gregg, R.H. Becker et al.2002 · 47 citationsarXiv
Chandra Detection of a TypeII Quasar at z=3.288astro-ph/0111513v1 · Daniel Stern, Edward C. Moran, Alison L. Coil et al.2001 · 150 citationsAstrophys.J. 568 (2002) 71-81
Optical Counterparts for 70,000 Radio Sources: APM Identifications for the FIRST Radio Surveyastro-ph/0110437v1 · Richard G. McMahon, Richard L. White, David J. Helfand et al.2001 · 84 citationsAstrophys.J.Suppl. 143 (2002) 1-24
The Reddest Quasarsastro-ph/0107441v1 · Michael D. Gregg, Mark Lacy (U.C. Davis/LLNL), Richard L. White (STScI) et al.2001 · 125 citationsAstrophys.J.564:133-142,2002
PSR J2229+6114: Discovery of an Energetic Young Pulsar in the Error Box of the EGRET Source 3EG J2227+6122astro-ph/0104109v1 · J. P. Halpern, F. Camilo, E. V. Gotthelf et al.2001 · 142 citationsarXiv
The Hard X-ray Luminosity of OB Star Populations: Implications for the Contribution of Star Formation to the Cosmic X-ray Backgroundastro-ph/0103484v1 · David J. Helfand (Columbia), Edward C. Moran2001 · 41 citationsarXiv
The First Observations of the Second Brightest Quasarastro-ph/0103026v1 · K. M. Leighly, J. P. Halpern, D. J. Helfand et al.2001 · 21 citationsarXiv
The Environments of a Complete, Moderate-Redshift Sample of FIRST Bent-Double Radio Sourcesastro-ph/0102499v1 · E. L. Blanton, M. D. Gregg, D. J. Helfand et al.2001 · 65 citationsarXiv
Long-term Optical Variability of Radio-Selected Quasars from the FIRST Surveyastro-ph/0012442v1 · David J. Helfand, Remington P.S. Stone, Beth Willman et al.2000 · 41 citationsarXiv
The Vela Pulsar and its Synchrotron Nebulaastro-ph/0007310v2 · D.J. Helfand, E.V. Gotthelf, J.P. Halpern (Columbia)2000 · 304 citationsAstrophys.J.556:380-391,2001
A Possible X-ray and Radio Counterpart of the High-Energy Gamma-ray Source 3EG J2227+6122astro-ph/0007076v2 · J. P. Halpern, E. V. Gotthelf, K. M. Leighly et al.2000 · 56 citationsarXiv
The FIRST Bright Quasar Survey. II. 60 Nights and 1200 Spectra Laterastro-ph/9912215v1 · R. L. White, R. H. Becker, M. D. Gregg et al.1999 · 366 citationsAstrophys.J.Suppl.126:133,2000
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