Search Publications
Reobserving the NLS1 galaxy RE J1034+396 - I. The long-term, recurrent X-ray QPO with a high significance
Done, Chris; Ward, Martin; Jin, Chichuan
RE J1034+396 is a narrow-line Seyfert 1 galaxy (NLS1) in which the first significant X-ray quasi-periodic oscillation (QPO) in an active galactic nucleus (AGN) was observed in 2007. We report the detection of this QPO in a recent XMM-Newton observation in 2018 with an even higher significance. The quality factor of this QPO is 20, and its period i…
MASCARA-4 b/bRing-1 b: A retrograde hot Jupiter around a bright A-type star
Snellen, I.; Kenworthy, M.; Wyttenbach, A. +26 more
Context. The Multi-site All-Sky CAmeRA (MASCARA) and bRing are both photometric ground-based instruments with multiple stations that rely on interline charge-coupled devices with wide-field lenses to monitor bright stars in the local sky for variability. MASCARA has already discovered several planets in the northern sky, which are among the bright…
The rotation period distribution of the rich Pleiades-age southern open cluster NGC 2516. Existence of a representative zero-age main sequence distribution
Strassmeier, K. G.; Barnes, S. A.; James, D. J. +1 more
Aims: We wish to measure the cool star rotation period distribution for the Pleiades-age rich open cluster NGC 2516 and use it to determine whether cluster-to-cluster variations exist in otherwise identical open clusters.
Methods: We obtained 42 d-long time-series CCD photometry of NGC 2516 in the V and Ic filters using the Ya…
Hot Dust-obscured Galaxies with Excess Blue Light
Stern, D.; Bauer, F. E.; Díaz-Santos, T. +10 more
Hot dust-obscured galaxies (Hot DOGs) are among the most luminous galaxies in the universe. Powered by highly obscured, possibly Compton-thick, active galactic nuclei (AGNs), Hot DOGs are characterized by spectral energy distributions that are very red in the mid-infrared yet dominated by the host galaxy stellar emission in the UV and optical. An …
Very Long Baseline Astrometry of PSR J1012+5307 and its Implications on Alternative Theories of Gravity
Deller, Adam T.; Kaplan, David L.; Lazio, T. Joseph W. +4 more
PSR J1012+5307, a millisecond pulsar in orbit with a helium white dwarf (WD), has been timed with high precision for about 25 yr. One of the main objectives of this long-term timing is to use the large asymmetry in gravitational binding energy between the neutron star and the WD to test gravitational theories. Such tests, however, will be eventual…
Synergistic Ground and Orbital Observations of Iron Oxides on Mt. Sharp and Vera Rubin Ridge
Arvidson, R. E.; Morris, R. V.; Pinet, P. +12 more
Visible/short-wave infrared spectral data from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) show absorptions attributed to hematite at Vera Rubin ridge (VRR), a topographic feature on northwest Mt. Sharp. The goals of this study are to determine why absorptions caused by ferric iron are strongly visible from orbit at VRR and to…
Completeness of the Gaia-verse - I. When and where were Gaia's eyes on the sky during DR2?
Everall, Andrew; Boubert, Douglas; Holl, Berry
The Gaia space mission is crafting revolutionary astrometric, photometric, and spectroscopic catalogues that will allow us to map our Galaxy, but only if we know the completeness of this Gaia-verse of catalogues: what stars does it contain and what stars is it missing? We argue that the completeness is driven by Gaia's spinning-and-precessing scan…
X-shooter Spectroscopy and HST Imaging of 15 Massive Quiescent Galaxies at z ≳ 2
Conselice, Christopher J.; Gallazzi, Anna; Zibetti, Stefano +23 more
We present a detailed analysis of a large sample of spectroscopically confirmed massive quiescent galaxies (MQGs; log(M */M ⊙) ∼ 11.5) at z ≳ 2. This sample comprises 15 galaxies selected in the COSMOS and UDS fields by their bright K-band magnitudes and followed up with Very Large Telescope (VLT) X-shooter spectroscopy and H…
First observation of the magnetic dipole CO2 absorption band at 3.3 µm in the atmosphere of Mars by the ExoMars Trace Gas Orbiter ACS instrument
Montmessin, F.; Korablev, O.; Bertaux, J. -L. +8 more
The atmosphere of Mars is dominated by CO2, making it a natural laboratory for studying CO2 spectroscopy. The Atmospheric Chemistry Suite (ACS) on board the ExoMars Trace Gas Orbiter uses solar occultation geometry to search for minor atmospheric species. During the first year of ACS observations, the attention was focused on…
Introducing the Search for Intermediate-mass Black Holes in Nearby Galaxies (SIBLING) Survey
Plotkin, Richard M.; Martínez-Palomera, Jorge; Lira, Paulina +2 more
Intermediate-mass black holes (IMBHs) have masses between 102 and 106 M⊙ and are key to our understanding of the formation of massive black holes. The known population of IMBHs remains small, with a few hundred candidates and only a handful of them confirmed as bona fide IMBHs. Until now, the most widely used selec…