Search Publications

Multifrequency Radio Observations of SNR J0536-6735 (N 59B) with Associated Pulsar

Bozzetto, L. M.; Stupar, M.; Crawford, E. J. +2 more

We present a study of new Australian Telescope Compact Array (ATCA) observations of supernova remnant, SNR J0536-6735. This remnant appears to follow a shell morphology with a diameter of D=36×29 pc (with 1 pc uncertainty in each direction). There is an embedded HII region on the northern limb of the remnant which made various analysis and measure…

VLT and Suzaku observations of the Fermi pulsar PSR J1028-5819

Marelli, M.; Razzano, M.; Esposito, P. +4 more

Context. The launch of the Fermi Gamma-ray Space Telescope in 2008 opened new perspectives in the multi-wavelength studies of neutron stars, with more than 100 γ-ray pulsars having since been detected. While most Fermi pulsars had previously been observed in the X-rays with Chandra and XMM-Newton, optical observations with 8 m-class telescopes exi…

Tidal interaction vs. ram pressure stripping effects as seen in X-rays. Hot gas in group and cluster galaxies

Bomans, D. J.; Braine, J.; Ehle, M. +4 more

Context. Cluster and group spiral galaxies are very often affected by their environment. The hot intracluster/intragroup medium (ICM/IGM) and a high galaxy density can lead to perturbations of the galactic interstellar medium (ISM) due to ram pressure and/or tidal interaction effects. In radio polarimetry observations, both phenomena may manifest …

Ionized Gas in the First 10 kpc of the Interstellar Galactic Halo: Metal Ion Fractions

Howk, J. Christopher; Consiglio, S. Michelle

We present direct measures of the ionization fractions of several sulfur ions in the Galactic warm ionized medium (WIM). We obtained high-resolution ultraviolet absorption-line spectroscopy of post-asymptotic giant branch stars in the globular clusters Messier 3 [(l, b) = (42fdg2, +78fdg7), d = 10.2 kpc, and z = 10.0 kpc] and Messier 5 [(l, b) = (…

Sunyaev-Zel'dovich signal of the maxBCG SDSS galaxy clusters in WMAP

Rozo, Eduardo; Hao, Jiangang; Dodelson, Scott +1 more

The Planck Collaboration measured the Sunyaev-Zel’dovich decrement of optically selected clusters from the Sloan Digital Sky Survey, finding that it falls significantly below expectations based on existing mass calibration of the maxBCG galaxy clusters. Resolving this tension requires either the data to go up, or the theoretical expectations to co…

Study of scattering characteristics of lunar equatorial region using Chandrayaan-1 Mini-SAR polarimetric data

Saran, Sriram; Das, Anup; Mohan, Shiv +1 more

The miniaturized synthetic aperture radar Mini-SAR onboard Indian Chandrayaan-1 mission was the first ever lunar orbiting SAR that acquired several data strips covering a wide variety of geological units over lunar equatorial and low latitude regions, some of which were not studied earlier at radar wavelengths. The Mini-SAR observations, complemen…

Plasma Turbulence in the Solar System

Narita, Y.

Compositional analysis of Hyperion with the Cassini Visual and Infrared Mapping Spectrometer

Clark, Roger N.; Cruikshank, Dale P.; Brad Dalton, J.

Compositional mapping of the surface of Hyperion using Cassini Visual and Infrared Mapping Spectrometer (VIMS) observations reveals a heterogeneous surface dominated by water ice accompanied by additional materials. Carbon dioxide, as evidenced by a prominent absorption band centered at 4.26 µm, is distributed over most of the surface, inclu…

Investigation of variability of iron emission lines in Centaurus X-3

Paul, Biswajit; Naik, Sachindra

We present the results obtained from a study of the variability of iron emission lines in the high mass X-ray binary pulsar Cen~X-3 during the eclipse, eclipse-egress and out-of-eclipse phases using XMM-Newton observations. Three iron emission lines at 6.4 keV, 6.7 keV, and 6.97 keV are clearly detected in the spectrum of the pulsar during the ent…

First simultaneous optical/near-infrared imaging of an X-ray selected, high-redshift cluster of galaxies with GROND. The galaxy population of XMMU J0338.7 + 0030 at z = 1.1

Böhringer, H.; Greiner, J.; Pratt, G. W. +28 more

Context. The XMM-Newton Distant Cluster Project is a serendipitous survey for clusters of galaxies at redshifts z ≥ 0.8 based on deep archival XMM-Newton observations. X-ray sources identified as extended are screened against existing optical all-sky surveys for galaxies, in case of candidate high-z clusters followed up with imaging at 4 m-class t…