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Predictions for Ultra-deep Radio Counts of Star-forming Galaxies
Cai, Zhen-Yi; Lapi, Andrea; Negrello, Mattia +6 more
We have worked outty predictions for the radio counts of star-forming galaxies down to nJy levels, along with redshift distributions down to the detection limits of the phase 1 Square Kilometer Array MID telescope (SKA1-MID) and of its precursors. Such predictions were obtained by coupling epoch-dependent star formation rate (SFR) functions with r…
Parallel Evolution of Quasi-separatrix Layers and Active Region Upflows
Pick, M.; Mandrini, C. H.; van Driel-Gesztelyi, L. +6 more
Persistent plasma upflows were observed with Hinode’s EUV Imaging Spectrometer (EIS) at the edges of active region (AR) 10978 as it crossed the solar disk. We analyze the evolution of the photospheric magnetic and velocity fields of the AR, model its coronal magnetic field, and compute the location of magnetic null-points and quasi-sepratrix layer…
The Ch-class Asteroids: Connecting a Visible Taxonomic Class to a 3 µm Band Shape
Emery, Joshua P.; Rivkin, Andrew S.; Thomas, Cristina A. +1 more
Asteroids belonging to the Ch spectral taxonomic class are defined by the presence of an absorption near 0.7 µm, which is interpreted as due to Fe-bearing phyllosilicates. Phyllosilicates also cause strong absorptions in the 3 µm region, as do other hydrated and hydroxylated minerals and H2O ice. Over the past decade, spectr…
Star Formation Across the W3 Complex
Tapia, Mauricio; Román-Zúñiga, Carlos G.; Ybarra, Jason E. +3 more
We present a multi-wavelength analysis of the history of star formation in the W3 complex. Using deep, near-infrared ground-based images combined with images obtained with Spitzer and Chandra observatories, we identified and classified young embedded sources. We identified the principal clusters in the complex and determined their structure and ex…
Using Multiple-viewpoint Observations to Determine the Interaction of Three Coronal Mass Ejections Observed on 2012 March 5
Vourlidas, Angelos; Colaninno, Robin C.
We examine the interaction of three coronal mass ejections (CMEs) that took place on 2012 March 5 at heights less than 20 R ⊙ in the corona. We used a forward fitting model to reconstruct the three-dimensional trajectories and kinematics of the CMEs and determine their interaction in the observations from three viewpoints: Solar and Hel…
On the Viability of the PAH Model as an Explanation of the Unidentified Infrared Emission Features
Zhang, Yong; Kwok, Sun
Polycyclic aromatic hydrocarbon (PAH) molecules are widely considered the preferred candidate for the carrier of the unidentified infrared emission bands observed in the interstellar medium and circumstellar envelopes. In this paper, we report the results of fitting a variety of non-PAH spectra (silicates, hydrogenated amorphous carbon, coal, and …
Constraining the galaxy mass content in the core of A383 using velocity dispersion measurements for individual cluster members
Zitrin, A.; Grillo, C.; Balestra, I. +14 more
We use velocity dispersion measurements of 21 individual cluster members in the core of Abell 383, obtained with Multiple Mirror Telescope Hectospec, to separate the galaxy and the smooth dark halo (DH) lensing contributions. While lensing usually constrains the overall, projected mass density, the innovative use of velocity dispersion measurement…
Depletion of chlorine into HCl ice in a protostellar core. The CHESS spectral survey of OMC-2 FIR 4
Ceccarelli, C.; Dominik, C.; Lis, D. C. +9 more
Context. The freezeout of gas-phase species onto cold dust grains can drastically alter the chemistry and the heating-cooling balance of protostellar material. In contrast to well-known species such as carbon monoxide (CO), the freezeout of various carriers of elements with abundances <10-5 has not yet been well studied.
Aims: O…
Large-scale outflow in quasar LBQS J1206+1052: HST/COS observations
Arav, Nahum; Chamberlain, Carter
Using two orbits of HST/COS archival observations, we measure the location and energetics of a quasar outflow from LBQS J1206+1052. From separate collisional excitation models of observed N III/N III* and S III/S III* troughs, we measure the electron number density n_e of the outflow. Both independent determinations are in full agreement and yield…
North-south asymmetry in global distribution of the solar wind speed during 1985-2013
Tokumaru, Munetoshi; Fujiki, Ken'ichi; Iju, Tomoya
Interplanetary scintillation (IPS) observations made between 1985 and 2013 are used to investigate the north-south (N-S) asymmetry in global distribution of the solar wind speed. The IPS observations clearly demonstrate that the global distribution of the solar wind speed systematically changes with the solar activity. This change is found to clos…