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Spatially resolved vertical vorticity in solar supergranulation using helioseismology and local correlation tracking
Birch, A. C.; Gizon, L.; Langfellner, J.
Flow vorticity is a fundamental property of turbulent convection in rotating systems. Solar supergranules exhibit a preferred sense of rotation, which depends on the hemisphere. This is due to the Coriolis force acting on the diverging horizontal flows. We aim to spatially resolve the vertical flow vorticity of the average supergranule at differen…
An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue
Murphy, Simon J.; Cheng, Kwang-Ping; Neff, James E. +6 more
The literature on the λ Boo stars has grown to become somewhat heterogenous, as different authors have applied different criteria across the UV, optical, and infrared regions to determine the membership status of λ Boo candidates. We aim to clear up the confusion by consulting the literature on 212 objects that have been considered as λ Boo candid…
Total eclipse of the heart: the AM CVn Gaia14aae/ASSASN-14cn
Prusti, T.; Gilmore, G.; Drake, A. J. +82 more
We report the discovery and characterization of a deeply eclipsing AM CVn-system, Gaia14aae (=ASSASN-14cn). Gaia14aae was identified independently by the All-Sky Automated Survey for Supernovae (ASAS-SN; Shappee et al.) and by the Gaia Science Alerts project, during two separate outbursts. A third outburst is seen in archival Pan-STARRS-1 (PS1; Sc…
Self-Absorption in the Solar Transition Region
He, Jiansen; Tian, Hui; Barczynski, Krzysztof +7 more
Transient brightenings in the transition region of the Sun have been studied for decades and are usually related to magnetic reconnection. Recently, absorption features due to chromospheric lines have been identified in transition region emission lines raising the question of the thermal stratification during such reconnection events. We analyze d…
Observations of radio-quiet quasars at 10-mas resolution by use of gravitational lensing
Sluse, Dominique; Jackson, Neal; Tagore, Amitpal S. +5 more
We present Very Large Array detections of radio emission in 4 four-image gravitational lens systems with quasar sources: HS 0810+2554, RX J0911+0511, HE 0435-1223 and SDSS J0924+0219, and extended Multi-Element Remote Linked Interferometer (e-MERLIN) observations of two of the systems. The first three are detected at a high level of significance, …
Dense Gas Fraction and Star-formation Efficiency Variations in the Antennae Galaxies
Bolatto, A. D.; da Cunha, E.; Leroy, A. K. +5 more
We use the Combined Array for Research in Millimeter-wave Astronomy (CARMA) millimeter interferometer to map the Antennae Galaxies (NGC 4038/39), tracing the bulk of the molecular gas via the 12CO(1-0) line and denser molecular gas via the high density transitions HCN(1-0), HCO+(1-0), CS(2-1), and HNC(1-0). We detect bright e…
The Scaling Relations and the Fundamental Plane for Radio Halos and Relics of Galaxy Clusters
Yuan, Z. S.; Han, J. L.; Wen, Z. L.
Diffuse radio emission in galaxy clusters is known to be related to cluster mass and cluster dynamical state. We collect the observed fluxes of radio halos, relics, and mini-halos for a sample of galaxy clusters from the literature, and calculate their radio powers. We then obtain the values of cluster mass or mass proxies from previous observatio…
Transiting the Sun: the Impact of Stellar Activity on X-Ray and Ultraviolet Transits
Llama, J.; Shkolnik, E. L.
Transits of hot Jupiters in X-rays and the ultraviolet have been shown to be both deeper and more variable than the corresponding optical transits. This variability has been attributed to hot Jupiters having extended atmospheres at these wavelengths. Using resolved images of the Sun from NASA’s Solar Dynamics Observatory spanning 3.5 yr of Solar C…
Luminosity-dependent spectral and timing properties of the accreting pulsar GX 304-1 measured with INTEGRAL
Klochkov, D.; Santangelo, A.; Staubert, R. +1 more
Context. Be/X-ray binaries show outbursts with peak luminosities up to a few times 1037 erg/s, during which they can be observed and studied in detail. Most (if not all) Be/X-ray binaries harbor accreting pulsars, whose X-ray spectra in many cases contain cyclotron resonant scattering features related to the magnetic field of the source…
Kinematics of Haro 11: The miniature Antennae
Östlin, G.; Hayes, M.; Adamo, A. +5 more
Luminous blue compact galaxies are among the most active galaxies in the local Universe in terms of their star formation rate per unit mass. They are rare at the current cosmic epoch, but were more abundant in the past and may be seen as the local analogues of higher red shift Lyman break galaxies. Studies of their kinematics is key to understandi…