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First Simultaneous Detection of Moving Magnetic Features in Photospheric Intensity and Magnetic Field Data
Yurchyshyn, Vasyl; Lim, Eun-Kyung; Goode, Philip
The formation and the temporal evolution of a bipolar moving magnetic feature (MMF) was studied with high-spatial and temporal resolution. The photometric properties were observed with the New Solar Telescope at Big Bear Solar Observatory using a broadband TiO filter (705.7 nm), while the magnetic field was analyzed using the spectropolarimetric d…
Bolocam Observations of Two Unconfirmed Galaxy Cluster Candidates from the Planck Early Sunyaev-Zel'dovich Sample
Umetsu, K.; Bridge, C.; Sayers, J. +5 more
We present Bolocam observations of two galaxy cluster candidates reported as unconfirmed in the Planck early Sunyaev-Zel'dovich (eSZ) sample, PLCKESZ G115.71+17.52 and PLCKESZ G189.84-37.24. We observed each of these candidates with Bolocam at 140 GHz from the Caltech Submillimeter Observatory in 2011 October. The resulting images have white noise…
Type II solar radio bursts: 2. Detailed comparison of theory with observations
Cairns, Iver H.; Robinson, P. A.; Hillan, D. S.
In this paper, the second in a two paper series, we quantitatively compare a detailed theory for type II solar radio bursts with observations and extract the parameters of the associated shocks. We use the techniques and assessment parameters developed and demonstrated in the companion paper for artificial data sets and solar wind models. Here we …
Modeling an array of encapsulated germanium detectors
Kshetri, R.
A probability model has been presented for understanding the operation of an array of encapsulated germanium detectors generally known as composite detector. The addback mode of operation of a composite detector has been described considering the absorption and scattering of γ-rays. Considering up to triple detector hit events, we have obtained ex…
Optical depth of the Martian atmosphere and surface albedo from high-resolution orbiter images
Thomas, N.; Hoekzema, N. M.; Stenzel, O. J. +2 more
In this paper we describe and evaluate the so-called shadow method. This method can be used to estimate the optical depth of the Martian atmosphere from the differences in brightness between shadowed and sunlit regions observed from an orbiter. We present elaborate and simplified versions of the method and analyze the capabilities and the sources …
A search for z= 7.3 Lyα emitters behind gravitationally lensing clusters
Richard, Johan; Shibuya, Takatoshi; Egami, Eiichi +3 more
We searched for z= 7.3 Lyα emitters (LAEs) behind two gravitationally lensing clusters, Abell 2390 and CL 0024, using the Subaru Telescope Suprime-Cam and a narrow-band filter NB1006 (λc∼ 1005 nm and full width at half-maximum of about 21 nm). The combination of the fully depleted CCDs of the Suprime-Cam, sensitive to z∼ 7 Lyα emission …
Overlapping ion structures in the mid-altitude cusp under northward IMF: signature of dual lobe reconnection?
Berchem, J.; Escoubet, C. P.; Pitout, F. +2 more
On some rare occasions, data from the Cluster Ion Spectrometer (CIS) in the mid-altitude cusp reveal overlapping ion populations under northward interplanetary magnetic field (IMF). While the poleward part of the cusp exhibits the expected reverse dispersion due to lobe reconnection, its equatorward part shows a second ion population at higher-ene…
Stellar subsystems of different ages in spiral and irregular galaxies
Tikhonov, N. A.; Galazutdinova, O. A.
Based on archival Hubble Space Telescope images, we have performed stellar photometry for eight edge-on spiral and irregular galaxies. We have identified stars of three ages in the derived Hertzsprung-Russell diagrams and constructed their number density distribution perpendicularly to the plane of the galactic disk. The sizes of the stellar subsy…
Asymmetry of Hard X-Ray Emissions at Conjugate Footpoints in Solar Flares
Krucker, Säm; Cheng, C. Z.; Yang, Ya-Hui +2 more
The chromospheric double hard X-ray (HXR) sources generally appear at the conjugate footpoints of flaring loops with asymmetric flux distributions. The behavior of such HXR footpoint asymmetry should be affected by several effects simultaneously and cannot be attributed to a single effect easily. In this study, we attempt to address the properties…
Cool Dust in the Outer Ring of NGC 1291
Murphy, E. J.; Armus, L.; Walter, F. +18 more
We examine Herschel Space Observatory images of one nearby prototypical outer ring galaxy, NGC 1291, and show that the ring becomes more prominent at wavelengths longer than 160 µm. The mass of cool dust in the ring dominates the total dust mass of the galaxy, accounting for at least 70% of it. The temperature of the emitting dust in the rin…