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The Plasma Environment in Comets over a Wide Range of Heliocentric Distances: Application to Comet C/2006 P1 (McNaught)
Rubin, M.; Shou, Y.; Toth, G. +3 more
On 2007 January 12, comet C/2006 P1 (McNaught) passed its perihelion at 0.17 AU. Abundant remote observations offer plenty of information on the neutral composition and neutral velocities within 1 million kilometers of the comet nucleus. In early February, the Ulysses spacecraft made an in situ measurement of the ion composition, plasma velocity, …
Faint Luminescent Ring over Saturn’s Polar Hexagon
Filacchione, Gianrico; Adriani, Alberto; Oliva, Fabrizio +2 more
Springtime insolation is presently advancing across Saturn's north polar region. Early solar radiation scattered through the gaseous giant's atmosphere gives a unique opportunity to sound the atmospheric structure at its upper troposphere/lower stratosphere at high latitudes. Here, we report the detection of a tenuous bright structure in Saturn's …
Witnessing Gas Mixing in the Metal Distribution of the Hickson Compact Group HCG 31
Mendes de Oliveira, C.; de Mello, D. F.; Amram, P. +3 more
We present for the first time direct evidence that in a merger of disk galaxies, the pre-existing central metallicities will mix as a result of gas being transported in the merger interface region along the line that joins the two coalescing nuclei. This is shown using detailed two-dimensional kinematics as well as metallicity measurements for the…
Broad Balmer Wings in BA Hyper/Supergiants Distorted by Diffuse Interstellar Bands: Five Examples in the 30 Doradus Region from the VLT-FLAMES Tarantula Survey
Walborn, Nolan R.; Sana, Hugues; Ulaczyk, Krzysztof +11 more
Extremely broad emission wings at Hβ and Hα have been found in VLT-FLAMES Tarantula Survey data for five very luminous BA supergiants in or near 30 Doradus in the Large Magellanic Cloud. The profiles of both lines are extremely asymmetrical, which we have found to be caused by very broad diffuse interstellar bands (DIBs) in the longward wing of Hβ…
Unbiased Correction Relations for Galaxy Cluster Properties Derived from Chandra and XMM-Newton
Zhao, Hai-Hui; Jia, Shu-Mei; Chen, Yong +2 more
We use a sample of 62 clusters of galaxies to investigate the discrepancies between the gas temperature and total mass within r 500 from XMM-Newton and Chandra data. Comparisons of the properties show that (1) both the de-projected and projected temperatures determined by Chandra are higher than those of XMM-Newton and there is a good l…
Searching for Overionized Plasma in the Gamma-ray-emitting Supernova Remnant G349.7+0.2
Ercan, E. N.; Majumdar, P.; Saha, L. +3 more
G349.7+0.2 is a supernova remnant (SNR) expanding in a dense medium of molecular clouds and interacting with clumps of molecular material emitting gamma-rays. We analyzed the gamma-ray data of the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope and detected G349.7+0.2 in the energy range of 0.2-300 GeV with a significance of ∼13σ…
Detection of Flux Emergence, Splitting, Merging, and Cancellation of Network Fields. II. Apparent Unipolar Flux Change and Cancellation
Hagenaar, H. J.; Iida, Y.; Yokoyama, T.
In this second paper in the series, we investigate occurrence frequencies of apparent unipolar processes, cancellation, and emergence of patch structures in quiet regions. Apparent unipolar events are considerably more frequent than cancellation and emergence, per our definition, which is consistent with Lamb et al. Furthermore, we investigate the…
Recent Stellar Mass Assembly of Low-mass Star-forming Galaxies at Redshifts 0.3 < z < 0.9
Barro, Guillermo; Tresse, Laurence; Charlot, Stéphane +5 more
The epoch when low-mass star-forming galaxies (LMSFGs) form the bulk of their stellar mass is uncertain. While some models predict an early formation, others favor a delayed scenario until later ages of the universe. We present constraints on the star formation histories (SFHs) of a sample of LMSFGs obtained through the analysis of their spectral …
The Kinematic and Chemical Properties of a Potential Core-forming Clump: Perseus B1-E
André, Ph.; Henning, Th.; Di Francesco, J. +4 more
We present 13CO and {{C}18}O (1-0), (2-1), and (3-2) maps toward the core-forming Perseus B1-E clump using observations from the James Clerk Maxwell Telescope, the Submillimeter Telescope of the Arizona Radio Observatory, and the IRAM 30 m telescope. We find that the 13CO and {{C}18}O line emission both …
Exploring the Bridge between A3556 and A3558 in the Shapley Supercluster
Kelley, R. L.; Gupta, A.; Mitsuishi, I. +4 more
Looking at the region connecting two clusters is a promising way to identify and study the Warm-Hot Intergalactic Medium. Observations show that the spectrum of the bridge between A3556 and A3558 has a stronger soft X-ray emission than the nearby region. Suzaku observations could not discriminate the origin of the extra emission. In this work we a…