Search Publications
Far-infrared Line Spectra of Seyfert Galaxies from the Herschel-PACS Spectrometer
Spinoglio, Luigi; Malkan, Matthew A.; Pereira-Santaella, Miguel +4 more
We observed the far-IR fine-structure lines of 26 Seyfert galaxies with the Herschel-PACS spectrometer. These observations are complemented with Spitzer Infrared Spectrograph and Herschel SPIRE spectroscopy. We used the ionic lines to determine electron densities in the ionized gas and the [C I] lines, observed with SPIRE, to measure the neutral g…
Ideas for Citizen Science in Astronomy
Fletcher, Leigh N.; Marshall, Philip J.; Lintott, Chris J.
We review the expanding, internet-enabled, and rapidly evolving field of citizen astronomy, focusing on research projects in stellar, extragalactic, and planetary science that have benefited from the participation of members of the public. These volunteers contribute in various ways: making and analyzing new observations, visually classifying feat…
Detections of Trans-Neptunian Ice in Protoplanetary Disks
Manoj, P.; Watson, D. M.; Sargent, B. +6 more
We present Herschel Space Observatory PACS spectra of T Tauri stars, in which we detect amorphous and crystalline water ice features. Using irradiated accretion disk models, we determine the disk structure and ice abundance in each of the systems. Combining a model-independent comparison of the ice feature strength and disk size with a detailed an…
Radio Jet Feedback and Star Formation in Heavily Obscured, Hyperluminous Quasars at Redshifts ∼ 0.5-3. I. ALMA Observations
Stern, D.; Smith, R.; Blain, A. +17 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) 870 µm (345 GHz) data for 49 high-redshift (0.47 < z < 2.85), luminous (11.7\lt {log}({L}{{bol}}/{L}⊙ )\lt 14.2) radio-powerful active galactic nuclei (AGNs), obtained to constrain cool dust emission from starbursts concurrent with highly obscured radi…
Properties of Chromospheric Evaporation and Plasma Dynamics of a Solar Flare from Iris
Kosovichev, Alexander G.; Sadykov, Viacheslav M.; Sharykin, Ivan N. +3 more
The dynamics of hot chromospheric plasma of solar flares is a key to understanding the mechanisms of flare energy release and particle acceleration. A moderate M1.0 class flare of 2014 June 12, (SOL2014-06-12T21:12) was simultaneously observed by NASA's Interface Region Imaging Spectrograph (IRIS) and other spacecraft, and also by the New Solar Te…
Star Formation Activity in CLASH Brightest Cluster Galaxies
Donahue, Megan; Moustakas, John; Connor, Thomas +2 more
The CLASH X-ray selected sample of 20 galaxy clusters contains 10 brightest cluster galaxies (BCGs) that exhibit significant (>5σ) extinction-corrected star formation rates (SFRs). Star formation activity is inferred from photometric estimates of UV and Hα+[N ii] emission in knots and filaments detected in CLASH Hubble Space Telescope ACS and W…
Discovery of a Strongly Phase-variable Spectral Feature in the Isolated Neutron Star RX J0720.4-3125
Tiengo, A.; Rea, N.; Turolla, R. +2 more
We present the discovery of a strongly phase-variable absorption feature in the X-ray spectrum of the nearby, thermally emitting, isolated neutron star RX J0720.4-3125. The absorption line was detected performing detailed phase-resolved spectroscopy in 20 XMM-Newton observations, covering the period 2000 May-2012 September. The feature has an ener…
Parameter estimation of superdiffusive motion of energetic particles upstream of heliospheric shocks
Zimbardo, Gaetano; Perri, Silvia; Fichtner, Horst +1 more
Context. In-situ spacecraft observations recently suggested that the transport of energetic particles accelerated at heliospheric shocks can be anomalous, i.e. the mean square displacement can grow non-linearly in time. In particular, a new analysis technique has permitted the study of particle transport properties from energetic particle time pro…
Multitechnique testing of the viscous decretion disk model. I. The stable and tenuous disk of the late-type Be star β CMi
Carciofi, A. C.; Rivinius, Th.; Štefl, S. +10 more
Context. The viscous decretion disk (VDD) model is able to explain most of the currently observable properties of the circumstellar disks of Be stars. However, more stringent tests, focusing on reproducing multitechnique observations of individual targets via physical modeling, are needed to study the predictions of the VDD model under specific ci…
Detection and estimation of ZY-3 three-line array image distortions caused by attitude oscillation
Tong, Xiaohua; Li, Lingyun; Liu, Shijie +5 more
ZY-3 is China's first civilian high-resolution stereo surveying and mapping satellite, which is equipped with a three-line array panchromatic stereo camera. However, high-resolution satellite images (HRSIs) often suffer from satellite attitude oscillation, which can cause image distortions, and thus affect the geo-positioning accuracy. This paper …