Search Publications
Evidence of Non-Thermal Hydrogen in the Exosphere of Mars Resulting in Enhanced Water Loss
Bertaux, J. L.; Clarke, J. T.; Halekas, J. +9 more
Atomic H is a direct tracer of water loss at Mars. The recent discovery of annual enhancements in its escape rate near perihelion, in excess of the previously established theory, indicates that Mars has lost substantial amounts of water to space. However, these loss rates are often estimated assuming thermal properties for the exospheric H atoms a…
The connection between stellar mass, age, and quenching time-scale in massive quiescent galaxies at z ≃ 1
Cullen, F.; McLure, R. J.; Dunlop, J. S. +6 more
We present a spectrophotometric study of a mass-complete sample of quiescent galaxies at 1.0 < z < 1.3 with $\mathrm{log_{10}}(M_{\star }/\mathrm{{\rm M}_{\odot }}) \ge 10.3$ drawn from the VANDELS survey, exploring the relationship between stellar mass, age, and star-formation history. Within our sample of 114 galaxies, we derive a stellar-…
On the follow-up efforts of long-period transiting planet candidates detected with Gaia astrometry
Sozzetti, A.; Giacobbe, P.; Lattanzi, M. G. +1 more
The class of transiting cold Jupiters, orbiting at ≳0.5-1.0 au, is to-date underpopulated. Probing their atmospheric composition and physical characteristics is particularly valuable, as it allows for direct comparisons with the Solar system giant planets. We investigate some aspects of the synergy between Gaia astrometry and other ground-based an…
Extended line emission in the BCG of Abell 2390
Drissen, Laurent; Muzzin, Adam; Yee, H. K. C. +10 more
We report CFHT/SITELLE imaging Fourier Transform Spectrograph observations of the brightest cluster galaxy (BCG) of galaxy cluster Abell 2390 at z = 0.228. The BCG displays a prominent cone of emission in H α, H β, [N II], and [O II] to the North-West with PA = 42°, 4.4 arcsec in length (15.9 kpc), which is associated with elongated and asymmetric…
The Complex X-Ray Obscuration Environment in the Radio-loud Type 2 Quasar 3C 223
Heckman, Timothy; Gandhi, Poshak; Yaqoob, Tahir +4 more
3C 223 is a radio-loud, Type 2 quasar at z = 0.1365 with an intriguing X-ray Multi-mirror Mission (XMM)-Newton spectrum that implicated it as a rare, Compton-thick (N H ≳ 1.25 × 1024 cm-2) active galactic nucleus (AGN). We obtained contemporaneous XMM-Newton and Nuclear Spectroscopic Telescope Array (NuSTAR) spectr…
Virial black hole mass estimates of quasars in the XQ-100 legacy survey
Wolf, Christian; Lai, Samuel; Bian, Fuyan +4 more
The black hole (BH) mass and luminosity are key factors in determining how a quasar interacts with its environment. In this study, we utilize data from the European Southern Observatory Large Programme XQ-100, a high-quality sample of 100 X-shooter spectra of the most luminous quasars in the redshift range 3.5 < z < 4.5, and measure the prop…
Unresolved Rossby and gravity modes in 214 A and F stars showing rotational modulation
Bowman, Dominic M.; Pallé, P. L.; Antoci, Victoria +9 more
Here, we report an ensemble study of 214 A- and F-type stars observed by Kepler, exhibiting the so-called hump and spike periodic signal, explained by Rossby modes (r modes) - the hump - and magnetic stellar spots or overstable convective (OsC) modes - the spike, respectively. We determine the power confined in the non-resolved hump features and f…
The MOSDEF-LRIS survey: detection of inflowing gas towards three star-forming galaxies at z 2
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +9 more
We report on the discovery of cool gas inflows towards three star-forming galaxies at <z> ~ 2.30. Analysis of Keck Low-Resolution Imaging Spectrometer spectroscopy reveals redshifted low-ionization interstellar (LIS) metal absorption lines with centroid velocities of 60-130 km s-1. These inflows represent some of the most robust d…
The false widow link between neutron star X-ray binaries and spider pulsars
Ingram, Adam; Middleton, Matthew; Rhodes, Lauren +3 more
The discovery of transitional millisecond pulsars (tMSPs) provided conclusive proof that neutron star (NS) low-mass X-ray binaries (LMXBs) comprise part of the evolutionary pathway towards binary millisecond pulsars (MSPs). Redback and black widow 'spider' pulsars are a subcategory of binary MSPs that 'devour' their companions through ablation - t…
The distance to the Serpens South cluster from H2O masers
Gong, Yan; Pillai, Thushara; Loinard, Laurent +3 more
In this Letter we report Very Long Baseline Array observations of 22 GHz water masers toward the protostar