The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125 (2008)
Updike, Adria C., Haislip, Joshua B., Nysewander, Melissa C., Fruchter, Andrew S., Kann, D. Alexander, Klose, Sylvio, ...
We report on multi-wavelength observations, ranging from the X-ray to radio wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic observations reveal the presence of absorption...
Neutral Hydrogen Absorption Toward XTE J1810-197: the Distance to a Radio-Emitting Magnetar (2007)
Minter, Anthony H., Camilo, Fernando, Ransom, Scott M., Halpern, Jules P., Zimmerman, Neil
We have used the Green Bank Telescope to measure HI absorption against the anomalous X-ray pulsar XTE J1810-197. Assuming a flat rotation curve, we find that XTE J1810-197 is located at a distance of...
The Intrinsically X-ray Weak Quasar PHL 1811. II. Optical and UV Spectra and Analysis (2007)
Leighly, Karen M., Halpern, Jules P., Jenkins, Edward B., Casebeer, Darrin
This is the second of two papers reporting observations and analysis of the unusually bright (m_b=14.4), luminous (M_B=-25.5), nearby (z=0.192) narrow-line quasar PHL 1811. The first paper reported...
Polarized radio emission from the magnetar XTE J1810-197 (2007)
Camilo, Fernando, Reynolds, John E., Johnston, Simon, Halpern, Jules P., Ransom, Scott M., Van Straten, Willem H.
We have used the Parkes radio telescope to study the polarized emission from the anomalous X-ray pulsar XTE J1810-197 at frequencies of 1.4, 3.2, and 8.4 GHz. We find that the pulsed emission is...
Polarized radio emission from the magnetar XTE J1810-197 (2007)
Camilo, Fernando, Reynolds, John E., Johnston, Simon, Halpern, Jules P., Ransom, Scott M., Van Straten, Willem H.
We have used the Parkes radio telescope to study the polarized emission from the anomalous X-ray pulsar XTE J1810-197 at frequencies of 1.4, 3.2, and 8.4 GHz. We find that the pulsed emission is...
Polarized radio emission from the magnetar XTE J1810-197 (2007)
Camilo, Fernando, Reynolds, John E., Johnston, Simon, Halpern, Jules P., Ransom, Scott M., Van Straten, Willem H.
We have used the Parkes radio telescope to study the polarized emission from the anomalous X-ray pulsar XTE J1810-197 at frequencies of 1.4, 3.2, and 8.4 GHz. We find that the pulsed emission is...
Recent Observations of EGRET Pulsar Wind Nebulae (2006)
Roberts, Mallory S. E., Gotthelf, E. V., Halpern, Jules P., Brogan, Crystal L., Ransom, Scott M.
We present recent X-ray and radio observations of pulsar wind nebulae discovered in EGRET error boxes. Two XMM-Newton observations show the X-ray extent of the rapidly moving PWN associated with the...
Leighly, Karen M., Halpern, Jules P., Jenkins, Edward B., Grupe, Dirk, Choi, Jiehae, Prescott, Kimberly B.
This is the first of two papers reporting observations and analysis of the unusually bright (m_b=14.4), luminous (M_B=-25.5), nearby (z=0.192) narrow-line quasar PHL 1811, focusing on the X-ray...
Long-Term Profile Variability of Double-Peaked Emmission Lines in AGNs (2004)
Lewis, Karen T., Eracleous, Michael, Halpern, Jules P., Storchi-Bergmann, Thaisa
An increasing number of AGNs exhibit broad, double-peaked Balmer emission lines, which arise from the outer regions of the accretion disk which fuels the AGN. The line profiles vary on timescales of...
The Low Quiescent X-Ray Luminosity of the Neutron Star Transient XTE J2123-058 (2004)
Tomsick, John A., Gelino, Dawn M., Halpern, Jules P., Kaaret, Philip
We report on the first X-ray observations of the neutron star soft X-ray transient (SXT) XTE J2123-058 in quiescence, made by Chandra and BeppoSAX, as well as contemporaneous optical observations. In...
PHL 1811: The Local Prototype of the Lineless High-z SDSS QSOs (2004)
Leighly, Karen M., Halpern, Jules P., Jenkins, Edward B.
Abridged) In the SDSS, several unusual QSOs have been discovered that have very blue rest-frame UV spectra but no discernible emission lines. Their UV spectra strongly resemble that of the newly...
Long Term Profile Variability of Double-Peaked Emission Lines in AGNs (2003)
Lewis, Karen T., Eracleous, Michael, Halpern, Jules P., Storchi-Bergmann, Thaisa
An increasing number of AGNs exhibit broad, double-peaked Balmer emission lines, which are thought to arise from the outer regions of the accretion disk which fuels the AGN. The line profiles are...
Accurate Redshifts and Classifications for 110 Radio-Loud AGNs (2003)
Eracleous, Michael, Halpern, Jules P.
We report accurate redshifts of 110 active galaxies (mostly radio-loud objects at z
Absorption-Line Systems and Galaxies in Front of the Second Brightest Quasar, PHL 1811 (2003)
Jenkins, Edward B., Bowen, David V., Tripp, Todd M., Sembach, Kenneth R., Leighly, Karen M., Halpern, Jules P., ...
The extraordinarily bright quasar PHL 1811 at a redshift z = 0.192 provides an attractive opportunity to use ultraviolet absorption-line spectroscopy to study the properties of gas systems in the...
The afterglow and complex environment of the optically dim burst GRB 980613 (2002)
Hjorth, Jens, Thomsen, Bjarne, Nielsen, Svend R., Andersen, Michael I., Holland, Stephen T., Fynbo, Johan U., ...
We report the identification of the optical afterglow of GRB 980613 in R- and I-band images obtained between 16 and 48 hours after the gamma-ray burst. Early near-infrared (NIR) H and K' observations...
Keck Measurement of the XTE J2123-058 Radial Velocity Curve (2001)
Tomsick, John A., Heindl, William A., Chakrabarty, Deepto, Halpern, Jules P., Kaaret, Philip
We measured the radial velocity curve of the companion of the neutron star X-ray transient XTE J2123-058. Its semi-amplitude (K_2) of 298.5 +/- 6.9 km/s is the highest value that has been measured...
NGC 3065: A Certified LINER With Broad, Variable Balmer Lines (2001)
Eracleous, Michael, Halpern, Jules P.
Motivated by the X-ray properties of the galaxy NGC 3065, we have obtained new optical spectra which reveal that it has a low-ionization nuclear emission-line region (LINER) as well as broad Balmer...
XTE J2123-058: A New Neutron Star X-Ray Transient (1999)
Tomsick, John A., Halpern, Jules P., Kemp, Jonathan, Kaaret, Philip
We report on optical and RXTE observations of a new high-latitude bursting X-ray transient, XTE J2123-058. We identified the optical counterpart, measured the 5.9573 hr orbital period and constrained...
Eracleous, Michael, Halpern, Jules P.
We present the X-ray spectrum of the broad-line radio galaxy Pictor A as observed by ASCA in 1996. The main objective of the observation was to detect and study the profiles of the Fe~K$\alpha$...
Optical and X-ray Spectroscopy of 1E 0449.4-1823: Demise of the original type 2 QSO (1998)
Halpern, Jules P., Eracleous, Michael, Forster, Karl
New optical spectra of the original narrow-line quasar 1E 0449.4-1823 show that it now has broad emission lines of considerable strength, eliminating it as a "type 2 QSO" candidate. We suggest that...
Newman, Jeffrey A., Eracleous, Michael, Filippenko, Alexei V., Halpern, Jules P.
The optical spectrum of the broad-line radio galaxy Arp 102B has been monitored for more than thirteen years to investigate the nature of the source of its broad, double-peaked hydrogen Balmer...
Extreme X-ray Variability In The Narrow-Line QSO PHL 1092 (1996)
Forster, Karl, Halpern, Jules P.
A ROSAT observation of the narrow-line Fe II QSO PHL 1092 shows rapid variability that requires an efficiency of at least 0.13, exceeding the theoretical maximum for an accretion disk around a...
X-ray spectra of active galactic nuclei / (1982)
Thesis (Ph. D.)--Harvard University, 1982.
X-ray spectra of active galactic nuclei [microform] / (1982)
Thesis (Ph. D.)--Harvard University, 1982.
X-ray spectra of active galactic nuclei / (1982)
Thesis (Ph. D.)--Harvard University, 1982.