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Parallaxes of Cool Objects with WISE: Filling in for Gaia
Theissen, Christopher A.
This paper uses the multi-epoch astrometry from the Wide-field Infrared Survey Explorer (WISE) to demonstrate a method to measure proper motions and trigonometric parallaxes with precisions of ∼4 mas yr-1 and ∼7 mas, respectively, for low-mass stars and brown dwarfs. This method relies on WISE single exposures (Level 1b frames) and a Ma…
The second Herschel-ATLAS Data Release - III. Optical and near-infrared counterparts in the North Galactic Plane field
Ivison, R. J.; Ibar, E.; Dunne, L. +8 more
This paper forms part of the second major public data release of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). In this work, we describe the identification of optical and near-infrared counterparts to the submillimetre detected sources in the 177 deg2 North Galactic Plane (NGP) field. We used the likelihood ratio met…
Spatially Resolved Broadband Synchrotron Emission from the Nonthermal Limbs of SN1006
Bregman, Joel N.; Acero, Fabio; Ballet, Jean +6 more
We present ∼400 ks NuSTAR observations of the northeast (NE) and southwest (SW) nonthermal limbs of the Galactic SNR SN1006. We discovered three sources with X-ray emission detected at ≳50 keV. Two of them are identified as background active galactic nuclei. We extract the NuSTAR spectra from a few regions along the nonthermal limbs and jointly an…
An empirical examination of WISE/NEOWISE asteroid analysis and results
Myhrvold, Nathan
Asteroid observations by the WISE space telescope and the analysis of those observations by the NEOWISE project have provided more information about the diameter, albedo, and other properties of approximately 164,000 asteroids, more than all other sources combined. The raw data set from this mission will likely be the largest and most important su…
Searching for Exoplanets around X-Ray Binaries with Accreting White Dwarfs, Neutron Stars, and Black Holes
Di Stefano, Rosanne; Imara, Nia
We recommend that the search for exoplanets around binary stars be extended to include X-ray binaries (XRBs) in which the accretor is a white dwarf, neutron star, or black hole. We present a novel idea for detecting planets bound to such mass transfer binaries, proposing that the X-ray light curves of these binaries be inspected for signatures of …
EUV Emission and Scattered Light Diagnostics of Equatorial Coronal Holes as Seen by Hinode/EIS
Landi, Enrico; Wendeln, Carolyn
Spectroscopic diagnostics of solar coronal plasmas critically depends on the uncertainty in the measured line intensities. One of the main sources of uncertainty is instrumental scattered light, which is potentially most important in low-brightness areas. In the solar corona, such areas include polar and equatorial coronal holes, which are the sou…
GRAWITA: VLT Survey Telescope observations of the gravitational wave sources GW150914 and GW151226
Covino, S.; D'Avanzo, P.; Campana, S. +50 more
We report the results of deep optical follow-up surveys of the first two gravitational-wave sources, GW150914 and GW151226, done by the GRAvitational Wave Inaf TeAm Collaboration (GRAWITA). The VLT Survey Telescope (VST) responded promptly to the gravitational wave alerts sent by the LIGO and Virgo Collaborations, monitoring a region of 90 and 72 …
A Changing Wind Collision
Corcoran, Michael F.; Hillier, D. John; Nazé, Yaël +4 more
We report on the first detection of a global change in the X-ray emitting properties of a wind-wind collision, thanks to XMM-Newton observations of the massive Small Magellenic Cloud (SMC) system HD 5980. While its light curve had remained unchanged between 2000 and 2005, the X-ray flux has now increased by a factor of ∼2.5, and slightly hardened.…
A VST and VISTA study of globular clusters in NGC 253
Greggio, Laura; Rejkuba, Marina; Arnaboldi, Magda +5 more
Context. Globular clusters (GCs) are key to our understanding of the Universe, as laboratories of stellar evolution, fossil tracers of the past formation epoch of the host galaxy, and effective distance indicators from local to cosmological scales. Aim. We analyze the properties of the sources in the NGC 253 with the aim of defining an up to date …
On Measuring the Variation of High-energy Cutoff in Active Galactic Nuclei
Wang, Jun-Xian; Zhang, Ji-Xian; Zhu, Fei-Fan
The variation in the high-energy cutoff, E c , in active galactic nuclei (AGNs) uniquely probes the corona physics. In this work, we show that the ratio of two NuSTAR spectra (analogous to the difference-imaging technique widely used in astronomy) is uniquely useful in studying E c variations. The spectra ratio could direc…