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Magellan LDSS3 emission confirmation of galaxies hosting metal-rich Lyman α absorption systems
Bowen, David V.; York, Donald G.; Florian, Michael +5 more
Using the Low Dispersion Survey Spectrograph 3 at the Magellan II Clay Telescope, we target candidate absorption host galaxies detected in deep optical imaging (reaching limiting apparent magnitudes of 23.0-26.5 in g, r, I, and z filters) in the fields of three QSOs, each of which shows the presence of high metallicity, high N_{H I} absorption sys…
Revised calibration for near- and mid-infrared images from ∼4000 pointed observations with AKARI/IRC
Onaka, Takashi; Yamamura, Issei; Usui, Fumihiko +3 more
The Japanese infrared astronomical satellite AKARI performed ∼4000 pointed observations for 16 months until the end of August 2007, when the telescope and instruments were cooled by liquid helium. Observation targets include solar system objects, Galactic objects, local galaxies, and galaxies at cosmological distances. We describe recent updates o…
The interstellar medium in Andromeda's dwarf spheroidal galaxies - I. Content and origin of the interstellar dust
De Looze, Ilse; Baes, Maarten; Bendo, George J. +8 more
Dwarf spheroidal galaxies are among the most numerous galaxy population in the Universe, but their main formation and evolution channels are still not well understood. The three dwarf spheroidal satellites (NGC 147, NGC 185, and NGC 205) of the Andromeda galaxy are characterized by very different interstellar medium properties, which might suggest…
A statistical study of magnetospheric electron density using the Cluster spacecraft
Dandouras, I.; Sandhu, J. K.; Yeoman, T. K. +1 more
Observations from the WHISPER (Waves of High frequency and Sounder for Probing of Electron density by Relaxation) instrument on board Cluster, for the interval spanning 2001-2012, are utilized to determine an empirical model describing the total electron density along closed geomagnetic field lines. The model, representing field lines in the regio…
Study of magnetic field geometry and extinction in Bok globule CB130
Das, H. S.; Chakraborty, A.
We trace the peripheral magnetic field structure of Bok globule CB130 by estimating the linear polarization of its field stars in the R band. The magnetic field orientation sampled by these stars, aligned on average among themselves, and the polarization produced within the cloud has a different direction from that of Galactic plane with an offset…
A Perturbative Analysis of Synchrotron Spectral Index Variation over the Microwave Sky
Aluri, Pavan K.; Saha, Rajib
In this paper, we implement a perturbative approach, first proposed by Bouchet & Gispert, to estimate the variation of the spectral index of galactic polarized synchrotron emission, using a linear combination of simulated Stokes Q polarization maps of selected frequency bands from WMAP and Planck observations on a region of sky dominated by th…
Morphological classification of local luminous infrared galaxies
Le Floc'h, E.; Armus, L.; Charmandaris, V. +6 more
We present analysis of the morphological classification of 89 luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey (GOALS) sample, using non-parametric coefficients and compare their morphology as a function of wavelength. We rely on images that were obtained in the optical (B- and I-band) as well as in the infrared …
Isolating the Young Stellar Population in the Outer Disk of NGC 300
Dolphin, Andrew E.; Skillman, Evan D.; Williams, Benjamin F. +2 more
The recent star formation history (SFH) in the outer disk of NGC 300 is presented through the analysis of color-magnitude diagrams (CMDs). We analyze resolved stellar photometry by creating CMDs from four Hubble Space Telescope fields containing a combination of images from the Advanced Camera for Surveys and the UVIS imager aboard the Wide Field …
The particle carriers of field-aligned currents in the Earth's magnetotail during a substorm
Dandouras, I.; Kistler, L. M.; Dunlop, M. +4 more
Although the particle carriers of field-aligned currents (FACs) in the Earth's magnetotail play an important role in the transfer of momentum and energy between the solar wind, magnetosphere, and ionosphere, the characteristics of the FAC carriers have been poorly understood. Taking advantage of multiinstrument magnetic field and plasma data colle…
Weak, Quiet Magnetic Fields Seen in the Venus Atmosphere
Luhmann, J. G.; Russell, C. T.; Zhang, T. L. +2 more
The existence of a strong internal magnetic field allows probing of the interior through both long term changes of and short period fluctuations in that magnetic field. Venus, while Earth’s twin in many ways, lacks such a strong intrinsic magnetic field, but perhaps short period fluctuations can still be used to probe the electrical conductivity o…