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The Taiwan ECDFS Near-Infrared Survey: Very Bright End of the Luminosity Function at z > 7
Tsai, Chao-Wei; Yan, Haojing; Ho, Paul T. P. +5 more
The primary goal of the Taiwan ECDFS Near-Infrared Survey (TENIS) is to find well-screened galaxy candidates at z > 7 (z' dropout) in the Extended Chandra Deep Field-South (ECDFS). To this end, TENIS provides relatively deep J and Ks data (~25.3 ABmag, 5σ) for an area of 0.5 × 0.5 deg. Leveraged with existing data at mid-infrared to …
Identification of red high proper-motion objects in Tycho-2 and 2MASS catalogues using Virtual Observatory tools
Caballero, J. A.; Solano, E.; Miles-Páez, P. A. +2 more
Aims: With available Virtual Observatory tools, we looked for new M dwarfs in the solar neighbourhood and M giants with high tangential velocities.
Methods: From an all-sky cross-match between the optical Tycho-2 and the near-infrared 2MASS catalogues, we selected objects with proper motions µ > 50 mas yr-1 and very r…
Electron scale structures of thin current sheets in magnetic reconnection
Malova, H. V.; Zelenyi, L. M.; Jain, N. +1 more
An electron-magnetohydrodynamic model is used to simulate the structure of an electron scale current sheet during early phase of collisionless magnetic reconnection. The current sheet develops structures, viz. bifurcated, filamented and triple-peak structures at different locations in the current sheet. The reversal of the net out-of-plane electri…
Nuclear X-Ray Properties of the Peculiar Radio-loud Hidden AGN 4C+29.30
Cheung, C. C.; Stawarz, Ł.; Migliori, G. +4 more
We present results from a study of nuclear emission from a nearby radio galaxy, 4C+29.30, over a broad 0.5-200 keV X-ray band. This study used new XMM-Newton (~17 ks) and Chandra (~300 ks) data, and archival Swift/BAT data from the 58 month catalog. The hard (>2 keV) X-ray spectrum of 4C+29.30 can be decomposed into an intrinsic hard power law …
Identifying Contaminated K-Band Globular Cluster RR Lyrae Photometry
Gieren, W.; Turner, D.; Majaess, D.
Acquiring near-infrared K-band (2.2 µm) photometry for RR Lyrae variables in globular clusters and nearby galaxies is advantageous, since the resulting distances are less impacted by reddening and metallicity. However, K-band photometry for RR Lyrae variables in M5, Reticulum, M92, ω Cen, and M15 display clustercentric trends. The Hubble Spa…
Spatial Distribution of Abundance Patterns in the Starburst Galaxy NGC 3079 Revealed with Chandra and Suzaku
Gandhi, Poshak; Matsushita, Kyoko; Tamagawa, Toru +1 more
We performed simultaneous spectral analyses of Chandra (26.6 ks) and Suzaku (102.3 ks) X-ray data of the starburst galaxy NGC 3079. The spectra were extracted from four regions: 0.'5 (2.25 kpc) circle, an inner 0.'5-1' (2.25-4.5 kpc) ring, and an outer 1'-2' (4.5-9 kpc) ring from Chandra, and 4' (18 kpc) circle from Suzaku, all centered on the nuc…
The characterization of the distant blazar GB6 J1239+0443 from flaring and low activity periods
Costa, E.; Mereghetti, S.; Barbiellini, G. +64 more
In 2008, AGILE and Fermi detected gamma-ray flaring activity from the unidentified EGRET source 3EG J1236+0457, recently associated with a flat spectrum radio quasar (GB6 J1239+0443) at z = 1.762. The optical counterpart of the gamma-ray source underwent a flux enhancement of a factor of 15-30 in six years, and of ∼10 in six months. We interpret t…
Cluster multipoint study of the acceleration potential pattern and electrodynamics of an auroral surge and its associated horn arc
Lucek, E.; Nilsson, H.; Karlsson, T. +10 more
Cluster results are presented from the acceleration region of an auroral surge and connected horn arc, observed during an extended time period of substorm activity. The Cluster spacecraft crossed different magnetic local time (MLT) sectors of the surge and horn, with lag times of 2-10 min. Acceleration potential patterns are derived for the horn a…
The wide skirt of the bashful ballerina: Hemispheric asymmetry of the heliospheric magnetic field in the inner and outer heliosphere
Mursula, K.; Virtanen, I. I.
We reanalyze the observations of the heliospheric magnetic field (HMF) made by the Pioneer 10 and 11 and Voyager 1 and 2 heliospheric probes since 1972, and calculate the HMF sector occurrence ratios and tangential component strengths in the different regions of the heliosphere. Observations at the distant probes and at 1 AU show a very consistent…
Exploring the effects of high-velocity flows in abundance determinations in H II regions: bidimensional spectroscopy of HH 204 in the Orion nebula
García-Rojas, J.; Mesa-Delgado, A.; Luridiana, V. +3 more
We present results from integral field optical spectroscopy with the Potsdam Multi-Aperture Spectrograph of the Herbig-Haro (HH) object HH 204, with a spatial sampling of 1 × 1 arcsec2. We have obtained maps of different emission lines, physical conditions and ionic abundances from collisionally excited lines. The ionization structure o…