Search Publications
Interpreting the Statistical Properties of High-z Extragalactic Sources Detected by the South Pole Telescope Survey
Cai, Zhen-Yi; Negrello, Mattia; De Zotti, Gianfranco
The results of the recently published spectroscopically complete survey of dusty star-forming galaxies detected by the South Pole Telescope over 2500 deg2 proved to be challenging for galaxy formation models that generally underpredict the observed abundance of high-z galaxies. In this paper we interpret these results in the light of a …
A study of globular clusters in a lenticular galaxy in Hydra I from deep HST/ACS photometry
Blakeslee, John P.; Cantiello, Michele; Raimondo, Gabriella +4 more
Aims: We take advantage of exquisitely deep optical imaging data from the Hubble Space Telescope's Advanced Camera for Surveys (HST/ACS) in the F475W (gF475W) and F606W (VF606W) bands to study the properties of the globular cluster (GC) population in the intermediate-mass lenticular galaxy PGC 087327in the Hydra I galaxy…
The Color Gradients of the Globular Cluster Systems in M87 and M49
Liu, Chengze; Côté, Patrick; Peng, Eric W. +8 more
Combining data from the ACS Virgo Cluster Survey and the Next Generation Virgo cluster Survey, we extend previous studies of color gradients of the globular cluster (GC) systems of the two most massive galaxies in the Virgo cluster, M87 and M49, to radii of ~15 R e (~200 kpc for M87 and ~250 kpc for M49, where R e is the ef…
Follow-up of Young Stars Identified with BANYAN Σ: New Low-mass Members of Nearby Moving Groups
Johns-Krull, Christopher M.; Flagg, L.; Stahl, Asa G.
The characterization of moving groups offers a powerful means to identify large populations of young stars. In this paper, we present a sample of follow-up observations for 56 systems that have previously been proposed as members of young stellar associations through the application of the BANYAN Σ kinematic classification tool. Our measurements, …
Saturn Anomalous Myriametric Radiation, a New Type of Saturn Radio Emission Revealed by Cassini
Jackman, C. M.; Kurth, W. S.; Cecconi, B. +10 more
A new radio component namely Saturn Anomalous Myriametric Radiation (SAM) is reported. A total of 193 SAM events have been identified by using all the Cassini Saturn orbital data. SAM emissions are L-O mode radio emission and occasionally accompanied by a first harmonic in R-X mode. SAM's intensities decrease with increasing distance from Saturn, …
Extremely Slow (V sw < 300 km s-1) Solar Winds (ESSWs) at 1 au: Causes of Extreme Geomagnetic Quiet at Earth
Hajra, Rajkumar; Tsurutani, Bruce T.
A search for extremely slow (V sw < 300 km s-1) solar winds (ESSWs) at 1 au has been conducted using hourly average solar wind data from 1963 through 2021. 297 ESSW events were identified with an average duration of ~2.0 ± 1.4 days. The lowest speed detected was 156 km s-1. Ten of the lowest-speed events were an…
Enthalpy-based modeling of tomographically reconstructed quiet-Sun coronal loops
Mandrini, C. H.; Vásquez, A. M.; Mac Cormack, C. +2 more
The structure of the solar corona is made of magnetic flux tubes or loops. Due to the lack of contrast with their environment, observing and studying coronal loops in the quiet Sun is extremely difficult. In this work we use a differential emission measure tomographic (DEMT) technique to reconstruct, from a series of EUV images covering an entire …
X-exoplanets coronal models and planet photoevaporation
Sanz-Forcada, Jorge
Investigation of the Timing and Spectral Properties of an Ultraluminous X-Ray Pulsar NGC 7793 P13
Hu, Chin-Ping; Kong, A. K. H.; Hui, C. Y. +3 more
We perform both timing and spectral analyses using the archival X-ray data taken with Swift, XMM-Newton, NICER, and NuSTAR from 2016 to 2020 to study an ultraluminous pulsar, NGC 7793 P13, that showed a long period of super-Eddington accretion. We use the Rayleigh test to investigate the pulsation at different epochs, and confirm the variation of …
Sequential Star Formation in the Young SMC Region NGC 602: Insights from ALMA
Bolatto, Alberto D.; Meixner, Margaret; Sabbi, Elena +7 more
NGC 602 is a young, low-metallicity star cluster in the "Wing" of the Small Magellanic Cloud. We reveal the recent evolutionary past of the cluster through analysis of high-resolution (~0.4 pc) Atacama Large Millimeter/submillimeter Array observations of molecular gas in the associated H II region N90. We identify 110 molecular clumps (R < 0.8 …