The Full Spectrum Galactic Terrarium: MHz to TeV Observations of Various Critters (2008)
Roberts, Mallory S. E., Brogan, C., Ransom, S., Lyutikov, M., Wilhelmi, E. De Oña, Djannati-Ataï, A., ...
Multi-wavelength studies at radio, infrared, optical, X-ray, and TeV wavelengths have discovered probable counterparts to many Galactic sources of GeV emission detected by EGRET. These include pulsar...
Roberts, Mallory S. E., Brogan, Crystal L.
We report the discovery of a partial ~2deg. diameter non-thermal radio shell coincident with Taz, the pulsar wind nebula (PWN) in the error box of the apparently variable gamma-ray source 3EG...
Runaway Massive Binaries and Cluster Ejection Scenarios (2006)
McSwain, M. Virginia, Ransom, Scott M., Boyajian, Tabetha S., Grundstrom, Erika D., Roberts, Mallory S. E.
The production of runaway massive binaries offers key insights into the evolution of close binary stars and open clusters. The stars HD 14633 and HD 15137 are rare examples of such runaway systems,...
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...
Two Pulsar Wind Nebulae: Chandra/XMM-Newton Imaging of GeV J1417-6100 (2005)
Roberts, Mallory S. E., Romani, Roger W.
We report on Chandra ACIS and XMM-Newton MOS/PN imaging observations of two pulsar wind nebulae (K3/PSR J1420-6048 and G313.3+0.1=`the rabbit') associated with the Galactic unidentified gamma-ray...
Pulsars and Their Nebulae as EGRET Sources (2005)
At the end of the EGRET mission, only 6-8 Galactic sources had been identified as young pulsars. Since then, several energetic pulsars have been discovered in EGRET error boxes along the Galactic...
Cohen, Martin, Green, Anne J., Roberts, Mallory S. E., Meade, Marilyn R., Babler, Brian, Indebetouw, Remy, ...
We present a new planetary nebula, first identified in images from the Australia Telescope Compact Array, although not recognized at that time. Recent observations with the Spitzer Space Telescope...
Pulsar Wind Nebulae in EGRET Error Boxes (2004)
Roberts, Mallory S. E., Brogan, Crystal L., Gaensler, Bryan M., Hessels, Jason W. T., Romani, Roger W.
A remarkable number of pulsar wind nebulae (PWN) are coincident with EGRET gamma-ray sources. X-ray and radio imaging studies of unidentified EGRET sources have resulted in the discovery of at least...
Roberts, Mallory S. E., Lyutikov, Maxim, Gaensler, Bryan M., Brogan, Crystal, Tam, Cindy R., Romani, Roger W.
The traditional view of radio pulsar wind nebulae (PWN), encouraged by the Crab nebula's X-ray and radio morphologies, is that they are a result of the integrated history of their pulsars' wind. The...
PSR J2021+3651: A New Gamma-Ray Pulsar Candidate (2004)
Roberts, Mallory S. E., Hessels, Jason W. T., Ransom, Scott M., Kaspi, Victoria M., Freire, Paulo C. C., Crawford, Fronefield, ...
The COS B high energy gamma-ray source 2CG 075+00, also known as GeV J2020+3658 or 3EG J2021+3716, has avoided identification with a low energy counterpart for over twenty years. We present a likely...
The Pulsed Spectra of Two Extraordinary Pulsars (2004)
Roberts, Mallory S. E., Ransom, Scott M., Gavriil, Fotis, Kaspi, Victoria M., Woods, Pete, Ibrahim, Alaa, ...
We report on X-ray monitoring of two isolated pulsars within the same RXTE field of view. PSR J1811-1925 in the young supernova remnant G11.2-0.3 has a nearly sinusoidal pulse profile with a hard...
New Pulsars Coincident With Unidentified Gamma-Ray Sources (2004)
Roberts, Mallory S. E., Ransom, Scott M., Hessels, Jason, Livingstone, Margaret, Tam, Cindy, Kaspi, Victoria, ...
We present the results of radio searches for pulsars within unidentified EGRET source error boxes. Using the Parkes multibeam system, we have surveyed 56 sources at Galactic latitudes |b| > 5 deg...
Recent Searches for Pulsars in Unidentified EGRET Error Boxes (2004)
Pulsars discovered since the end of the EGRET mission coincident with unidentified high-energy gamma-ray sources are prime targets for AGILE. Both general surveys and targeted observations have been...
The Expansion of G11.2-0.3, a Radio Composite Supernova Remnant (2003)
Tam, Cindy, Roberts, Mallory S. E.
We compare recent observations of the supernova remnant G11.2-0.3 taken with the VLA during 2001-02 with images from VLA archives (1984-85) to detect and measure the amount of expansion that has...
Pulsar Searches of EGRET Sources (2002)
The majority of Galactic high-energy gamma-ray sources continue to elude identification. Currently, we have a handful of firm pulsar identifications, one of which is radio quiet, and a few marginal...
The Pulsar Wind Nebula in G11.2-0.3 (2002)
Roberts, Mallory S. E., Tam, Cindy R., Kaspi, Victoria M., Lyutikov, Maxim, Vasisht, Gautam, Pivovaroff, Michael, ...
We present an X-ray and radio study of the wind nebula surrounding the central pulsar PSR J1811-1925 in the supernova remnant G11.2-0.3. Using high resolution data obtained with the Chandra X-ray...
PSR J2021+3651: A Young Radio Pulsar Coincident with an Unidentified EGRET Gamma-ray Source (2002)
Roberts, Mallory S. E., Hessels, Jason W. T., Ransom, Scott M., Kaspi, Victoria M., Freire, Paulo C. C., Crawford, Fronefield, ...
We report on a deep search for radio pulsations toward five unidentified ASCA X-ray sources coincident with EGRET gamma-ray sources. This search has led to the discovery of a young and energetic...
Spectral Components of the Radio Composite Supernova Remnant G11.2-0.3 (2002)
Tam, Cindy, Roberts, Mallory S. E., Kaspi, Victoria M.
We present a high-resolution radio study of the supernova remnant (SNR) G11.2-0.3 using archival VLA data. Spectral tomography is performed to determine the properties of this composite-type SNR's...
Chandra Imaging of the Gamma-Ray Source GeV J1809-2327 (2002)
Braje, Timothy M., Romani, Roger W., Roberts, Mallory S. E., Kawai, Nobuyuki
We report on Chandra imaging observations of the Galactic Unidentified $\gamma$-ray source GEV J1809-2327, comparing the X-ray images with new VLA 1.46 GHz and 4.86 GHz maps. The X-ray images reveal...
Pulsar Wind Nebulae as High Energy Gamma-Ray Emitters (2001)
Roberts, Mallory S. E., Gaensler, Bryan M., Romani, Roger W.
There is growing evidence that some variable high-energy gamma-ray sources are associated with pulsar wind nebulae. We review the current status of X-ray and radio studies of the sources most likely...
Multiwavelength Studies of PSR J1420-6048, a Young Pulsar in the Kookaburra (2001)
Roberts, Mallory S. E., Romani, Roger W., Johnston, Simon
We present X-ray, radio, and infrared observations of the 68 ms pulsar PSR J1420-6048 and its surrounding nebula, a possible counterpart of the gamma-ray source GeV J1417-6100/3EG J1420-6038. Pulsed...
Phase Dependent Spectral Variability of 4U1907+09 (2001)
Roberts, Mallory S. E., Michelson, Peter F., Leahy, Denis A., Hall, Tony A., Finley, John P., Cominsky, Lynn R., ...
We report on ASCA, RXTE, and archival observations of the high mass X-ray binary pulsar 4U1907+09. Spectral measurements of the absorption and flux were made at all phases of the X-ray pulsar orbit,...
X-Ray and Radio Observations of Bright GeV Sources (2001)
Roberts, Mallory S. E., Romani, Roger W., Kawai, Nobuyuki, Gaensler, Bryan M., Johnston, Simon
We present X-ray and radio studies of sources which are brightabove 1 GeV (F_{>1GeV} > 4e-8 ph/cm^2/s. Only 11 out of ~30 of these gamma-ray sources have been identified with lower energy...
The ASCA Catalog of Potential X-Ray Counterparts of GeV Sources (2000)
Roberts, Mallory S. E., Romani, Roger W., Kawai, Nobuyuki
We present a catalog of 2-10 keV ASCA Gas Imaging Spectrometer images of fields containing bright sources of GeV emission. The images cover $\sim 85%$ of the 95% confidence position contour for 28 of...
The `Rabbit': A Potential Radio Counterpart of GeV J1417-6100 (1998)
Roberts, Mallory S. E., Romani, Roger W., Johnston, Simon, Green, Anne J.
We have mapped the radio emission in the error ellipse of GeV J1417-6100 (2EGS J1418-6049) at 13cm and 20cm using the Australia Telescope Compact Array. We find a large shell with extended wings, at...