Search Publications
ENISALA. II. Distinct Star Formation and Active Galactic Nucleus Activity in Merging and Relaxed Galaxy Clusters
Sobral, David; Stroe, Andra
The growth of galaxy clusters is energetic and may trigger and/or quench star formation and black hole activity. The ENISALA4 project is a collection of multiwavelength observations aimed at understanding how large-scale structure drives galaxy and black hole evolution. Here, we introduce optical spectroscopy of over 800 Hα emission-lin…
A Collage of Small Planets from the Lick-Carnegie Exoplanet Survey: Exploring the Super-Earth and Sub-Neptune Mass Regime
Butler, R. Paul; Vogt, Steven S.; Henry, Gregory W. +12 more
Analysis of new precision radial velocity (RV) measurements from the Lick Automated Planet Finder and Keck HIRES has yielded the discovery of three new exoplanet candidates orbiting the nearby stars HD 190007 and HD 216520. We also report new velocities from the APF and the Planet Finder Spectrograph and updated orbital fits for the known exoplane…
RELICS: ICL Analysis of the z = 0.566 Merging Cluster WHL J013719.8-08284
Coe, Dan; Jiménez-Teja, Yolanda; Dupke, Renato A. +3 more
We present a pilot study of the intracluster light (ICL) in massive clusters using imaging of the z = 0.566 cluster of galaxies WHL J013719.8-08284 observed by the RELICS project with the Hubble Space Telescope. We measure the ICL fraction in four optical ACS/WFC filters (F435W, F475W, F606W, and F814W) and five infrared WFC3/IR bands (F105W, F110…
A statistical study of solar radio Type III bursts and space weather implication
Ndacyayisenga, Theogene; Uwamahoro, Jean; Monstein, Christian +1 more
Solar radio bursts (SRBs) are the signatures of various phenomenon that happen in the solar corona and interplanetary medium (IPM). In this article, we have studied occurrence of Type III bursts and their association with the Sunspot number. This study confirms that occurrence of Type III bursts correlate well with Sunspot number. Further, using t…
Three-dimensional Climate Simulations for the Detectability of Proxima Centauri b
Berrilli, Francesco; Giovannelli, Luca; Galuzzo, Daniele +2 more
The discovery of a planet orbiting around Proxima Centauri, the closest star to the Sun, opens new avenues for the remote observations of the atmosphere and surface of an exoplanet, Proxima b. To date, three-dimensional (3D) general circulation models (GCMs) are the best available tools to investigate the properties of the exo-atmospheres, waiting…
Model Age Derivation of Large Martian Impact Craters, Using Automatic Crater Counting Methods
Norman, C.; Lagain, A.; Servis, K. +3 more
Determining when an impact crater formed is a complex and tedious task. However, this knowledge is crucial to understanding the geological history of planetary bodies and, more specifically, gives information on erosion rate measurements, meteorite ejection location, impact flux evolution and the loss of a magnetic field. The derivation of an indi…
Connection among environment, cloud-cloud collision speed, and star formation activity in the strongly barred galaxy NGC 1300
Ohta, Kouji; Maeda, Fumiya; Fujimoto, Yusuke +1 more
Cloud-cloud collision (CCC) has been suggested as a mechanism to induce massive star formation. Recent simulations suggest that a CCC speed is different among galactic-scale environments, which is responsible for observed differences in star formation activity. In particular, a high-speed CCC is proposed as a cause of star formation suppression in…
X-ray analysis of SDSS J165202.60+172852.4, an obscured quasar with outflows at peak galaxy formation epoch
Hamann, Fred; Veilleux, Sylvain; Goulding, Andy D. +4 more
We report on deep XMM-Newton and NuSTAR observations of the high redshift, z = 2.94, extremely red quasar (ERQ), SDSS J165202.60+172852.4, with known galactic ionized outflows detected via spatially resolved [O III] emission lines. X-ray observations allow us to directly probe the accretion disc luminosity and the geometry and scale of the circumn…
NGTS clusters survey - III. A low-mass eclipsing binary in the Blanco 1 open cluster spanning the fully convective boundary
Triaud, Amaury H. M. J.; Wheatley, Peter J.; Bayliss, Daniel +27 more
We present the discovery and characterization of an eclipsing binary identified by the Next Generation Transit Survey in the ~115-Myr-old Blanco 1 open cluster. NGTS J0002-29 comprises three M dwarfs: a short-period binary and a companion in a wider orbit. This system is the first well-characterized, low-mass eclipsing binary in Blanco 1. With a l…
Molecular Gas within the Milky Way's Nuclear Wind
Richter, Philipp; Jenkins, Edward B.; Savage, Blair D. +9 more
We report the first direct detection of molecular hydrogen associated with the Galactic nuclear wind. The Far-Ultraviolet Spectroscopic Explorer spectrum of LS 4825, a B1 Ib-II star at l, b = 1.67°,-6.63° lying d = 9.9 ${}_{-0.8}^{+1.4}$ kpc from the Sun, ~1 kpc below the Galactic plane near the Galactic center, shows two high-velocity H2