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Dynamical Mass Constraints on the Ultraluminous X-Ray Source NGC 1313 X-2
Orosz, Jerome; Bregman, Joel N.; Liu, Jifeng
Dynamical mass measurements hold the key to answering whether ultraluminous X-ray sources (ULXs) are intermediate-mass black holes (IMBHs) or stellar-mass black holes with special radiation mechanisms. NGC 1313 X-2 is so far the only ULX with Hubble Space Telescope light curves, the orbital period, and the black hole's radial velocity amplitude ba…
Co-registration of Chang'E-1 stereo images and laser altimeter data with crossover adjustment and image sensor model refinement
Di, Kaichang; Hu, Wenmin; Liu, Yiliang +1 more
Topographic information is of fundamental importance for various scientific investigations in lunar and planetary exploration. To provide high-precision, seamless mapping capability, it is critical to co-register image and altimetry data, the two major data sources for topographic modeling. This paper presents a method for co-registration of Chang…
On Magnetic Fields of Active Regions at Coronal Heights
Bogod, V. M.; Stupishin, A. G.; Yasnov, L. V.
This paper analyzes the magnetic field structure of active regions at coronal heights determined by means of multi-wavelength observations of polarized radio emission in the microwave range, and compares it with the force-free magnetic field extrapolation into the corona from the photospheric magnetograms. Our method of one-dimensional radio stere…
Physical Structure and Nature of Supernova Remnants in M101
Chu, You-Hua; Gruendl, Robert A.; Chen, C. -H. Rosie +6 more
Supernova remnant (SNR) candidates in the giant spiral galaxy M101 have been previously identified from ground-based Hα and [S II] images. We have used archival Hubble Space Telescope (HST) Hα and broadband images as well as stellar photometry of 55 SNR candidates to examine their physical structure, interstellar environment, and underlying stella…
Retrieval of ionospheric profiles from the Mars Express MARSIS experiment data and comparison with radio occultation data
Sánchez-Cano, B.; Witasse, O.; Blelly, P. -L. +4 more
Since 2005 the Mars Advanced Radar and Ionospheric Sounding experiment (MARSIS) aboard Mars Express has acquired a unique dataset on the ionosphere of Mars made up of ionospheric soundings taken by the instrument working in its active ionospheric sounding (AIS) mode. These soundings play a role similar to those of modern Terrestrial digisondes in …
Measuring the solar meridional flow from perturbations of eigenfunctions of global oscillations
Roth, M.; Schad, A.; Timmer, J.
We present a new concept to infer the meridional flow in the deep solar interior from global oscillation data. This concept is based on the estimation of the coupling strengths of p-mode eigenfunctions mediated by the meridional flow. We illustrate the performance of the method using simulations and present first inversion results of a large-scale…
Giant flux ropes observed in the magnetized ionosphere at Venus
Luhmann, J. G.; Russell, C. T.; Wei, H. Y. +10 more
The Venus ionospheric response to solar and solar wind variations is most evident in its magnetic field properties. Early Pioneer Venus observations during the solar maximum revealed that the Venus ionosphere exhibits two magnetic states depending on the solar wind dynamic pressure conditions: magnetized ionosphere with large-scale horizontal magn…
TA-DA: A Tool for Astrophysical Data Analysis
Da Rio, Nicola; Robberto, Massimo
We present the Tool for Astrophysical Data Analysis (TA-DA), a new software aimed to greatly simplify and improve the analysis of stellar photometric data in comparison with theoretical models, and allow the derivation of stellar parameters from multi-band photometry. Its flexibility allows one to address a number of such problems: from the interp…
The First Confirmed Microlens in a Globular Cluster
Minniti, D.; Udalski, A.; Pietrukowicz, P. +2 more
In 2000 July/August a microlensing event occurred at a distance of 2.33 arcmin from the center of the globular cluster M22 (NGC 6656), observed against the dense stellar field of the Milky Way bulge. We have used the adaptive optics system NACO at the ESO Very Large Telescope to resolve the two objects that participated in the event: the lens and …
The starburst-active galactic nucleus connection in the merger galaxy Mrk 938: an infrared and X-ray view
Altieri, B.; Valtchanov, I.; Esquej, P. +14 more
Mrk 938 is a luminous infrared (IR) galaxy in the local Universe believed to be the remnant of a galaxy merger. It shows a Seyfert 2 nucleus and intense star formation according to optical spectroscopic observations. We have studied this galaxy using new Herschel far-IR imaging data in addition to archival X-ray, UV, optical, near-IR and mid-IR da…