Search Publications
The Extended Cycle of Solar Activity and the Sun's 22-Year Magnetic Cycle
Cliver, E. W.
The Sun has two characteristic migrations of surface features—the equatorward movement of sunspots and the poleward movement of high-latitude prominences. The first of these migrations is a defining aspect of the 11-yr Schwabe cycle and the second is a tracer of the process that culminates in solar polarity reversal, signaling the onset of the 22-…
Clustering, host halos, and environment of z ~ 2 galaxies as a function of their physical properties
Dickinson, Mark; Daddi, Emanuele; Finoguenov, Alexis +13 more
Using a sample of 25 683 star-forming and 2821 passive galaxies at z ~ 2, selected in the COSMOS field following the BzK color criterion, we study the hosting halo mass and environment of galaxies as a function of their physical properties. Spitzer and Herschel allow us to obtain accurate star formation rate estimates for starburst galaxies. We me…
Inverse insolation dependence of Venus' cloud-level convection
Imamura, Takeshi; Ando, Hiroki; Sugimoto, Norihiko +4 more
It is generally accepted that convection in planetary atmospheres is enhanced in low latitudes and in the daytime where incoming solar radiation is intense. Here we demonstrate, using a local convection model, that this tendency is reversed for Venus' cloud-level convection, which is driven by heating of the cloud base by upwelling infrared radiat…
The Dwarfs beyond: The Stellar-to-halo Mass Relation for a New Sample of Intermediate Redshift Low-mass Galaxies
Ellis, Richard S.; Newman, Andrew B.; Miller, Sarah H. +1 more
A number of recent challenges to the standard ΛCDM paradigm relate to discrepancies that arise in comparing the abundance and kinematics of local dwarf galaxies with the predictions of numerical simulations. Such arguments rely heavily on the assumption that the Local Volume's dwarf and satellite galaxies form a representative distribution in term…
Feeding versus feedback in NGC 1068 probed with Gemini NIFS - I. Excitation
Storchi-Bergmann, Thaisa; Riffel, Rogemar A.; McGregor, Peter J. +1 more
We present emission-line flux distributions and ratios for the inner ≈200 pc of the narrow-line region (NLR) of the Seyfert 2 galaxy NGC 1068, using observations obtained with the Gemini Near-infrared Integral Field Spectrograph (NIFS) in the J, H and K bands at a spatial resolution of ≈10 pc and spectral resolution of ≈5300. The molecular gas emi…
Reconstruction of the primordial power spectra with Planck and BICEP2 data
Hu, Bin; Cai, Rong-Gen; Guo, Zong-Kuan +1 more
By using the cubic spline interpolation method, we reconstruct the shape of the primordial scalar and tensor power spectra from the recently released Planck temperature and BICEP2 polarization cosmic microwave background data. We find that the vanishing scalar index running (dns/dlnk) model is strongly disfavored at more than 3σ confide…
Compiling catalogs of stellar coordinates and proper motions via coprocessing of archival photographic and modern CCD observations
Andruk, V. N.; Protsyuk, Yu. I.; Kovylianska, O. E. +3 more
A catalog of positions and proper motions of stars in the fields around open clusters was compiled at the Research Institute—Nikolaev Astronomical Observatory (NAO) with the use of the results of photographic observations conducted in the 20th century (at the NAO zonal astrograph with D = 11.6 cm and F = 2.04 m) and modern CCD observations perform…
Signatures of anisotropic sources in the trispectrum of the cosmic microwave background
Shiraishi, Maresuke; Komatsu, Eiichiro; Peloso, Marco
Soft limits of N-point correlation functions, in which one wavenumber is much smaller than the others, play a special role in constraining the physics of inflation. Anisotropic sources such as a vector field during inflation generate distinct angular dependence in all these correlators, and introduce a fix privileged direction in our sky. In this …
Herschel-ATLAS: far-infrared properties of radio-loud and radio-quiet quasars
Ivison, R. J.; de Zotti, G.; Ibar, E. +11 more
We have constructed a sample of radio-loud and radio-quiet quasars from the Faint Images Radio Sky at Twenty-one centimetres and the Sloan Digital Sky Survey Data Release 7, over the Herschel-ATLAS Phase 1 area (9h, 12h and 14{h.}5). Using a stacking analysis, we find a significant correlation between th…
Hybrid method for crater detection based on topography reconstruction from optical images and the new LU78287GT catalogue of Lunar impact craters
Lončarić, Sven; Wöhler, Christian; Salamunićcar, Goran +1 more
Impact craters are ubiquitous and well-studied structures of high geological relevance on the surfaces of the Earth's Moon, the terrestrial planets, the asteroids and the satellites of the outer planets. Therefore, it is not surprising that crater detection algorithms (CDAs) are one of the most studied subjects of image processing and analysis in …