Search Publications

Variable oxygen emission from the accretion disk of Mrk 110

Grosso, N.; Porquet, D.; Reeves, J. N. +2 more

Six XMM-Newton observations of the bright narrow line Seyfert 1, Mrk 110, from 2004-2020, are presented. The analysis of the grating spectra from the Reflection Grating Spectrometer (RGS) reveals a broad component of the He-like Oxygen (O VII) line, with a full width at half maximum of 15 900 ± 1800 km s⁻¹ measured in the mean spectrum.…

V680 Mon - a young mercury-manganese star in an eclipsing heartbeat system

Vaňko, Martin; Paunzen, Ernst; Hümmerich, Stefan +3 more

Chemically peculiar stars in eclipsing binary systems are rare objects that allow the derivation of fundamental stellar parameters and important information on evolutionary status and the origin of the observed chemical peculiarities. Here we present an investigation of the known eclipsing binary system BD+09 1467 = V680 Mon. Using spectra from th…

A deep XMM-Newton observation of the X-Persei-like binary system CXOU J225355.1+624336

Sidoli, L.; Esposito, P.; La Palombara, N. +2 more

We report on the follow-up XMM-Newton observation of the persistent X-ray pulsar CXOU J225355.1+624336, which was discovered with the CATS@BAR project on archival Chandra data. The source was detected at f_X(0.5−10 keV) = 3.4 × 10⁻¹² erg cm⁻² s⁻¹, a flux level that is fully consistent with previous observ…

Point spread function reconstruction of adaptive-optics imaging: meeting the astrometric requirements for time-delay cosmography

Treu, Tommaso; Fassnacht, Christopher D.; Chen, Geoff C. -F. +3 more

Astrometric precision and knowledge of the point spread function are key ingredients for a wide range of astrophysical studies including time-delay cosmography in which strongly lensed quasar systems are used to determine the Hubble constant and other cosmological parameters. Astrometric uncertainty on the positions of the multiply-imaged point so…

Magnetotail Processes

Khotyaintsev, Yuri; Runov, Andrei; Birn, Joachim

A Deep Census of Outlying Star Formation in the M101 Group

Mihos, J. Christopher; Harding, Paul; Watkins, Aaron E. +1 more

We present deep, narrowband imaging of the nearby spiral galaxy M101 and its group environment to search for star-forming dwarf galaxies and outlying H II regions. Using the Burrell Schmidt telescope, we target the brightest emission lines of star-forming regions, Hα, Hβ, and [O III], to detect potential outlying star-forming regions. Our survey c…

Radiation Belt Response to Fast Reverse Shock at Geosynchronous Orbit

Kanekal, Shrikanth G.; Sibeck, David; Bhaskar, Ankush +5 more

Fast reverse shocks (FRSs) cause the magnetosphere to expand, by contrast to the well-known compressions caused by the impact of fast forward shocks (FFS). Usually, FFSs are more geoeffective than FRSs, and consequently the inner magnetosphere dynamic responses to both shock types can be quite different. In this study, we investigate for the first…

Retrieving Exoplanet Atmospheres Using Planetary Infrared Excess: Prospects for the Night Side of WASP-43 b and Other Hot Jupiters

Lustig-Yaeger, Jacob; Stevenson, Kevin B.; Mayorga, L. C. +4 more

To increase the sample size of future atmospheric characterization efforts, we build on the planetary infrared excess (PIE) technique that has been proposed as a means to detect and characterize the thermal spectra of transiting and non-transiting exoplanets using sufficiently broad wavelength coverage to uniquely constrain the stellar and planeta…

Deciphering the 3D Orion Nebula. II. A Low Ionization Region of Multiple Velocity Components Southwest of θ¹ Ori C Confounds Interpretation of Low Velocity Resolution Studies of Temperature, Density, and Abundance

Abel, N. P.; O'Dell, C. R.; Ferland, G. J.

We establish that there are two velocity systems along lines of sight that contribute to the emission-line spectrum of the brightest parts of the Orion Nebula. These overlie the Orion-S embedded molecular cloud southwest of the dominant ionizing star (θ¹ Ori C). Examination of 10 × 10″ samples of high spectral resolution emission-line s…

Herschel Photometric Observations of LITTLE THINGS Dwarf Galaxies

Madden, Suzanne C.; Gomez, Haley L.; Brinks, Elias +6 more

We present here far-infrared photometry of galaxies in a sample that is relatively unexplored at these wavelengths: low-metallicity dwarf galaxies with moderate star formation rates. Four dwarf irregular galaxies from the LITTLE THINGS survey are considered, with deep Herschel PACS and SPIRE observations at 100, 160, 250, 350, and 500 µm. Re…