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No Activity among 13 Centaurs Discovered in the Pan-STARRS1 Detection Database
Wainscoat, Richard J.; Lilly, Eva; Hsieh, Henry +5 more
Centaurs are small bodies orbiting in the giant planet region that were scattered inward from their source populations beyond Neptune. Some members of the population display comet-like activity during their transition through the solar system, the source of which is not well understood. The range of heliocentric distances where the active Centaurs…
Size and Shape of (11351) Leucus from Five Occultations
Dunham, David W.; Dunham, Joan B.; Lauer, Tod R. +76 more
We present observations of five stellar occultations for (11351) Leucus and reports from two efforts on (21900) Orus. Both objects are prime mission candidate targets for the Lucy Discovery mission. Combined results for Leucus indicate a very dark surface with pV = 0.037 ± 0.001, which is derived from the average of the multichord occul…
Nitrogen X-ray absorption in the local ISM
García, Javier A.; Gatuzz, Efrain; Kallman, Timothy R.
Nitrogen is one of the most abundant metals in the interstellar medium (ISM), and thus it constitutes an excellent test to study a variety of astrophysical environments, ranging from nova to active galactic nuclei. We present a detailed analysis of the gaseous component of the N K-edge using high-resolution XMM-Newton spectra of 12 Galactic and 40…
Linear spectropolarimetric analysis of fairall 9 with VLT/FORS2
Mazzei, Paola; D'Onofrio, Mauro; Czerny, Bożena +10 more
The quasar main sequence appears to be an incredibly powerful tool to organize the diversity in large samples of type-1 quasars but the most important physical parameters governing it are still unclear. Here, we investigate the origin of the broadening and of a defining feature of Population B sources: a strong redward asymmetry of the Balmer emis…
Identification confusion and blending concealment in the SDSS-DR16 Quasar catalogues - 40 new quasars and 82 false quasars identified
Flesch, Eric Wim
The SDSS-DR16 Quasar Superset and pipeline catalogues are searched for undeclared quasars that were concealed by or confused with other objects, usually due to incomplete deblending. 40 such quasars with redshifts are found and herewith presented. Also, 82 entries in the SDSS-DR16Q main quasar catalogue are shown to be non-quasars, some also due t…
Multiband Imaging of the HD 36546 Debris Disk: A Refined View from SCExAO/CHARIS
Henning, Thomas; Currie, Thayne; Kwon, Jungmi +21 more
We present the first multiwavelength (near-infrared; 1.1-2.4 µm) imaging of HD 36546's debris disk, using the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system coupled with the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS). As a 3-10 Myr old star, HD 36546 presents a rare opportunity to study a debris disk at…
Identifying Candidate Optical Variables Using Gaia Data Release 2
Strader, Jay; Andrew, Shion; Swihart, Samuel J.
Gaia is undertaking a deep synoptic survey of the Galaxy, but photometry from individual epochs has, as of yet, only been released for a minimal number of sources. We show that it is possible to identify variable stars in Gaia Data Release 2 by selecting stars with unexpectedly large photometric uncertainties given their brightness and number of o…
Comparison of light-time formulations in the post-Newtonian framework for the BepiColombo MORE experiment
Cappuccio, Paolo; di Stefano, Ivan; Cascioli, Gael +1 more
The ESA/JAXA BepiColombo mission, launched on 20 October 2018, is currently in cruise toward Mercury. The Mercury Orbiter Radio-science Experiment (MORE), one of the 16 experiments of the mission, will exploit range and range-rate measurements collected during superior solar conjunctions to better constrain the post-Newtonian parameter γ. The MORE…
Multi-messenger astronomy with INTEGRAL
Mereghetti, Sandro; Götz, Diego; Kuulkers, Erik +19 more
At the time of defining the science objectives of the INTernational Gamma-Ray Astrophysics Laboratory (INTEGRAL), such a rapid and spectacular development of multi-messenger astronomy could not have been predicted, with new impulsive phenomena becoming accessible through different channels. Neutrino telescopes have routinely detected energetic neu…
Evolution of timing and spectral characteristics of 4U 1901+03 during its 2019 outburst using the Swift and NuSTAR observatories
Maitra, Chandreyee; Beri, Aru; Girdhar, Tinku +1 more
We report the results from a detailed timing and spectral study of a transient X-ray pulsar, 4U 1901+03 during its 2019 outburst. We performed broadband spectroscopy in the 1-70 $\rm keV$ energy band using four observations made with Swift and NuSTAR at different intensity levels. Our timing results reveal the presence of highly variable pulse pro…