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The Nature of Hα-selected Galaxies at z > 2. II. Clumpy Galaxies and Compact Star-forming Galaxies
Koyama, Yusei; Kodama, Tadayuki; Hayashi, Masao +3 more
We present the morphological properties of Hα-selected galaxies at z > 2 in SXDF-UDS-CANDELS field. With high-resolution optical/near-infrared images obtained by the Hubble Space Telescope, we identify giant clumps within the Hα emitters (HAEs). We find that at least 41% of our sample shows clumpy structures in the underlying disks. The color g…
Spectroscopic evidence for a low-mass black hole in SWIFT J1753.5-0127
Tsygankov, Sergey S.; Poutanen, Juri; Kajava, Jari J. E. +4 more
The black hole (BH) candidate SWIFT J1753.5-0127 has remained active since the onset of its 2005 outburst. Emission lines in the optical spectrum were observed at the very beginning of the outburst, but since then the spectrum has been featureless making a precise BH mass estimation impossible. Here we present results from our optical and ultravio…
Kinematic structure of massive star-forming regions. I. Accretion along filaments
Henning, Th.; Krause, O.; Beuther, H. +8 more
Context. The mid- and far-infrared view on high-mass star formation, in particular with the results from the Herschel space observatory, has shed light on many aspects of massive star formation. However, these continuum studies lack kinematic information.
Aims: We study the kinematics of the molecular gas in high-mass star-forming regions.
A treatment procedure for Gemini North/NIFS data cubes: application to NGC 4151
Ricci, T. V.; Steiner, J. E.; Menezes, R. B.
We present a detailed procedure for treating data cubes obtained with the Near-Infrared Integral Field Spectrograph (NIFS) of the Gemini North telescope. This process includes the following steps: correction of the differential atmospheric refraction, spatial re-sampling, Butterworth spatial filtering, `instrumental fingerprint' removal and Richar…
Oblique reflections in the Mars Express MARSIS data set: Stable density structures in the Martian ionosphere
Gurnett, D. A.; André, M.; Edberg, N. J. T. +6 more
The Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) onboard the European Space Agency's Mars Express (MEX) spacecraft routinely detects evidence of localized plasma density structures in the Martian dayside ionosphere. Such structures, likely taking the form of spatially extended elevations in the plasma density at a given alt…
A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun. I. Atmospheric parameters and color similarity to the Sun
Porto de Mello, G. F.; da Silva, R.; da Silva, L. +1 more
Context. Solar twins and analogs are fundamental in the characterization of the Sun's place in the context of stellar measurements, as they are in understanding how typical the solar properties are in its neighborhood. They are also important for representing sunlight observable in the night sky for diverse photometric and spectroscopic tasks, bes…
Evidence for Wave Heating of the Quiet-Sun Corona
Hahn, M.; Savin, D. W.
We have measured the energy and dissipation of Alfvénic waves in the quiet Sun. A magnetic field model was used to infer the location and orientation of the magnetic field lines along which the waves are expected to travel. The waves were measured using spectral lines to infer the wave amplitude. The waves cause a non-thermal broadening of the spe…
The CHESS survey of the L1157-B1 bow-shock: high and low excitation water vapor
Codella, C.; Ceccarelli, C.; Benedettini, M. +9 more
Context. Molecular outflows powered by young protostars strongly affect the kinematics and chemistry of the natal molecular cloud through strong shocks. This results in substantial modifications of the abundance of several species. In particular, water is a powerful tracer of shocked material because of its sensitivity to both physical conditions …
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…