Search Publications
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…
Dusty Starbursts and the Formation of Elliptical Galaxies: A SCUBA-2 Survey of a z = 1.46 Cluster
Thomson, A. P.; Smail, Ian; Swinbank, A. M. +8 more
We report the results of a deep SCUBA-2 850 and 450 µm survey for dust-obscured ultra-/luminous infrared galaxies (U/LIRGs) in the field of the z = 1.46 cluster XCS J2215.9-1738. We detect a striking overdensity of submillimeter sources coincident with the core of this cluster: ∼3-4 × higher than expected in a blank field. We use the likely …
Photoabsorption cross-section measurements of 32S, 33S, 34S, and 36S sulfur dioxide from 190 to 220 nm
Endo, Yoshiaki; Danielache, Sebastian O.; Ueno, Yuichiro +4 more
The ultraviolet absorption cross sections of the SO2 isotopologues are essential to understanding the photochemical fractionation of sulfur isotopes in planetary atmospheres. We present measurements of the absorption cross sections of 32SO2, 33SO2, 34SO2, and 36
The Dust Attenuation Curve versus Stellar Mass for Emission Line Galaxies at z ~ 2
Trump, Jonathan R.; Schneider, Donald P.; Bridge, Joanna +8 more
We derive the mean wavelength dependence of stellar attenuation in a sample of 239 high redshift (1.90\lt z\lt 2.35) galaxies selected via Hubble Space Telescope WFC3 IR grism observations of their rest-frame optical emission lines. Our analysis indicates that the average reddening law follows a form similar to that derived by Calzetti et al. for …