Search Publications

X-Ray Spectrum of RBS 315: Absorption or Intrinsic Curvature

Behar, Ehud; Mushotzky, Richard F.; Ben Haim, Sivan

X-ray absorption of high-redshift quasars is enigmatic, because it remains unclear where in the universe the absorbing gas is. If absorption occurs near the high-z host, it could help us understand early stages of galaxy formation. If it is in the intergalactic medium (IGM), it provides a unique way to probe this elusive baryon component. We repor…

Lens Model and Source Reconstruction Reveal the Morphology and Star Formation Distribution in the Cool Spiral LIRG SGAS J143845.1+145407

Rigby, Jane R.; Whitaker, Katherine E.; Sharon, Keren +8 more

We present Hubble Space Telescope (HST) imaging and grism spectroscopy of a strongly lensed LIRG at z = 0.816, SGAS 143845.1+145407, and use the magnification boost of gravitational lensing to study the distribution of star formation throughout this galaxy. Based on the HST imaging data, we create a lens model for this system; we compute the mass …

A Hubble Space Telescope Survey for Novae in the Globular Clusters of M87

Shara, Michael M.; Zurek, David; Doyle, Trisha F. +1 more

The giant elliptical galaxy M87 has been imaged over 30 consecutive days in 2001, 60 consecutive days in 2005-2006, and every 5 days over a 265-day span in 2016-2017 with the Hubble Space Telescope, leading to the detection of 137 classical novae throughout M87. We have identified 2134 globular clusters (GC) in M87 in these images and carried out …

Relation between solar flares and halo coronal mass ejections

Sankarasubramanian, K.; Rao, V. Koteswara; Gopal, K. Rama +2 more

Solar flares and coronal mass ejections (CMEs) are two very important active events from Sun. Inspite of several theoretical and statistical analyses, the relation between solar flares and CMEs is so far not well established, and strong opinions and arguments still continue. Statistical approaches use a lot of data available from many measurements…

Automated reconstruction of subsurface interfaces in Promethei Lingula near the Martian south pole by using SHARAD data

Muller, J. -P.; Xiong, S.

Subsurface layers are preserved in polar regions on Mars, which are considered to be a record of past climate changes on Mars. Orbital radar instruments like the SHAllow RADar (SHARAD) on board Mars Reconnaissance Orbiter (MRO) transmit radar signals to Mars and receive a set of signals returned from interfaces having a contrast in dielectric prop…

Io’s Atmosphere Silhouetted by Jupiter Lyα

Feaga, L. M.; Roth, L.; Retherford, K. D. +4 more

We report results from a new technique for mapping Io’s SO₂ vapor distribution. The Space Telescope Imaging Spectrograph (STIS) instrument on the Hubble Space Telescope observed Io during four Jupiter transit events to obtain medium resolution far-UV spectral images near the Lyα wavelength of 121.6 nm. Jupiter’s bright Lyα dayglow provi…

AKARI mid-infrared slit-less spectroscopic catalogue

Baba, Shunsuke; Onaka, Takashi; Yamamura, Issei +4 more

AKARI/IRC is capable of conducting slit-less spectroscopy in the mid-infrared (5-13 µm) over a 10' × 10' area with a spectral resolution of 50, which is suitable for serendipitous surveys. The data reduction is, however, rather complicated by the confusion of nearby sources after dispersing the spectra. To achieve efficient and reliable data…

Investigating the Pulsar Wind Nebula 3C 58 Using Emission Models

An, Hongjun; Park, Jaegeun; Kim, Seungjong

We present IR flux density measurements, models of the broadband SED, and results of SED modeling for the Pulsar Wind Nebula (PWN) 3C 58. We find that the Herschel flux density seems to be slightly lower than suggested by interpolation of previous measurements in nearby wavebands, implying that there may be multiple electron populations in 3C 58. …

Calibration of parent and fragment ion detection rates in Rosettas ROSINA/DFMS mass spectrometer

Altwegg, K.; Balsiger, H.; Fuselier, S. A. +7 more

Revisiting the magnetization of comet 67P/Churyumov-Gerasimenko

Richter, I.; Glassmeier, K. H.; Heinisch, P. +1 more

Context. The landing of the Philae probe as part of the ESA Rosetta mission made it possible to study the magnetization of comet 67P/Churyumov-Gerasimenko (67P) by combining observations from the lander and orbiter. In this work, we revisit the magnetic properties with information gained during the progression of the mission for a comprehensive un…