Search Publications
WFC3 GRISM Confirmation of the Distant Cluster Cl J1449+0856 at langzrang = 2.00: Quiescent and Star-forming Galaxy Populations
Finoguenov, A.; Cimatti, A.; Daddi, E. +7 more
We present deep Hubble Space Telescope Wide Field Camera 3 (HST/WFC3) slitless spectroscopic observations of the distant cluster Cl J1449+0856. These cover a single pointing with 18 orbits of G141 spectroscopy and F140W imaging, allowing us to derive secure redshifts down to M 140 ~ 25.5 AB and 3σ line fluxes of ~5 × 10-18 er…
Effect of the background magnetic field inhomogeneity on generation processes of whistler-mode chorus and broadband hiss-like emissions
Katoh, Yuto; Omura, Yoshiharu
By a series of self-consistent electron hybrid code simulations, we study the effect of the background magnetic field inhomogeneity on the generation process of whistler-mode chorus emissions. Chorus with rising tones are generated through nonlinear wave-particle interactions occurring around the magnetic equator. The mirror force plays an importa…
Large Abundances of Polycyclic Aromatic Hydrocarbons in Titan's Upper Atmosphere
López-Puertas, M.; D'Aversa, E.; García-Comas, M. +6 more
In this paper, we analyze the strong unidentified emission near 3.28 µm in Titan's upper daytime atmosphere recently discovered by Dinelli et al. We have studied it by using the NASA Ames PAH IR Spectroscopic Database. The polycyclic aromatic hydrocarbons (PAHs), after absorbing UV solar radiation, are able to emit strongly near 3.3 µm…
A Measurement of the Kinetic Sunyaev-Zel'dovich Signal Toward MACS J0717.5+3745
Pierpaoli, E.; Bock, J.; Egami, E. +18 more
We report our analysis of MACS J0717.5+3745 using 140 and 268 GHz Bolocam data collected at the Caltech Submillimeter Observatory. We detect extended Sunyaev-Zel'dovich (SZ) effect signal at high significance in both Bolocam bands, and we employ Herschel-SPIRE observations to subtract the signal from dusty background galaxies in the 268 GHz data. …
A revised radiometric calibration for the Hinode/EIS instrument
Del Zanna, G.
An assessment of the in-flight radiometric calibration of the Hinode EUV Imaging Spectrometer (EIS) is presented. This is done with the line ratio technique applied to a wide range of observations of the quiet Sun, active regions, and flares from 2006 until 2012. The best diagnostic lines and the relevant atomic data are discussed in detail. Radia…
Energization of O+ ions in the Earth's inner magnetosphere and the effects on ring current buildup: A review of previous observations and possible mechanisms
Keika, Kunihiro; Brandt, Pontus C.; Kistler, Lynn M.
In situ observations and modeling work have confirmed that singly charged oxygen ions, O+, which are of Earth's ionospheric origin, are heated/accelerated up to >100 keV in the magnetosphere. The energetic O+ population makes a significant contribution to the plasma pressure in the Earth's inner magnetosphere during magnet…
Cloud level winds from the Venus Express Monitoring Camera imaging
Roatsch, Th.; Ignatiev, N. I.; Markiewicz, W. J. +7 more
Six years of continuous monitoring of Venus by European Space Agency’s Venus Express orbiter provides an opportunity to study dynamics of the atmosphere our neighbor planet. Venus Monitoring Camera (VMC) on-board the orbiter has acquired the longest and the most complete so far set of ultra violet images of Venus. These images enable a study the c…
Active Galactic Nucleus Feedback Works Both Ways
Dettmar, R. -J.; Norris, R. P.; Middelberg, E. +1 more
Simulations of galaxy growth need to invoke strong negative feedback from active galactic nuclei (AGNs) to suppress the formation of stars and thus prevent the over-production of very massive systems. While some observations provide evidence for such negative feedback, other studies find either no feedback or even positive feedback, with increased…
Dust and star formation properties of a complete sample of local galaxies drawn from the Planck Early Release Compact Source Catalogue
Baccigalupi, C.; Bonavera, L.; Clements, D. L. +16 more
We combine Planck High Frequency Instrument data at 857, 545, 353 and 217 GHz with data from Wide-field Infrared Survey Explorer (WISE), Spitzer, IRAS and Herschel to investigate the properties of a well-defined, flux-limited sample of local star-forming galaxies. A 545 GHz flux density limit was chosen so that the sample is 80 per cent complete a…
Unidentified Infrared Emission Bands: PAHs or MAONs?
Zhang, Yong; Kwok, Sun
We suggest that the carrier of the unidentified infrared emission (UIE) bands is an amorphous carbonaceous solid with mixed aromatic/aliphatic structures, rather than free-flying polycyclic aromatic hydrocarbon molecules. Through spectral fittings of the astronomical spectra of the UIE bands, we show that a significant amount of the energy is emit…