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Observations of the near- to Mid-infrared Unidentified Emission Bands in the Interstellar Medium of the Large Magellanic Cloud
Onaka, Takashi; Sakon, Itsuki; Kaneda, Hidehiro +3 more
We present the results of near- to mid-infrared slit spectroscopic observations (2.55-13.4 µm) of the diffuse emission toward nine positions in the Large Magellanic Cloud with the infrared camera on board AKARI. The target positions are selected to cover a wide range of the intensity of the incident radiation field. The unidentified infrared…
Water Ice in the Kuiper Belt
Brown, M. E.; Schaller, E. L.; Fraser, W. C.
We examine a large collection of low-resolution near-infrared spectra of Kuiper Belt objects (KBOs) and centaurs in an attempt to understand the presence of water ice in the Kuiper Belt. We find that water ice on the surface of these objects occurs in three separate manners: (1) Haumea family members uniquely show surfaces of nearly pure water ice…
The CHESS survey of the L1157-B1 shock: the dissociative jet shock as revealed by Herschel-PACS
Codella, C.; Ceccarelli, C.; Benedettini, M. +9 more
Outflows generated by protostars heavily affect the kinematics and chemistry of the hosting molecular cloud through strong shocks that enhance the abundance of some molecules. L1157 is the prototype of chemically active outflows, and a strong shock, called B1, is taking place in its blue lobe between the precessing jet and the hosting cloud. We pr…
Supernova Remnant Progenitor Masses in M31
Dolphin, Andrew E.; Williams, Benjamin F.; Gilbert, Karoline M. +5 more
Using Hubble Space Telescope photometry, we age-date 59 supernova remnants (SNRs) in the spiral galaxy M31 and use these ages to estimate zero-age main-sequence masses (M ZAMS) for their progenitors. To accomplish this, we create color-magnitude diagrams (CMDs) and employ CMD fitting to measure the recent star formation history of the r…
COSMOS: Stochastic Bias from Measurements of Weak Lensing and Galaxy Clustering
Massey, Richard; Kneib, Jean-Paul; Rhodes, Jason +6 more
In the theory of structure formation, galaxies are biased tracers of the underlying matter density field. The statistical relation between galaxy and matter density field is commonly referred to as galaxy bias. In this paper, we test the linear bias model with weak-lensing and galaxy clustering measurements in the 2 deg2 COSMOS field. W…
Unveiling the nature of INTEGRAL objects through optical spectroscopy. IX. Twenty two more identifications, and a glance into the far hard X-ray Universe
Palazzi, E.; Minniti, D.; Masetti, N. +14 more
Since its launch in October 2002, the INTEGRAL satellite has revolutionized our knowledge of the hard X-ray sky thanks to its unprecedented imaging capabilities and source detection positional accuracy above 20 keV. Nevertheless, many of the newly-detected sources in the INTEGRAL sky surveys are of unknown nature. The combined use of available inf…
Properties of the Intracluster Medium of Abell 3667 Observed with Suzaku XIS
Nakazawa, Kazuhiro; Ohashi, Takaya; Kaastra, Jelle +4 more
We observed the northwest region of the cluster of galaxies Abell 3667 with the Suzaku XIS instrument. The temperature and surface brightness of the intracluster medium were measured up to the virial radius (r200 ∼ 2.3 Mpc). The radial temperature profile is flatter than the average profile for other clusters until the radius reaches th…
Photometry and Photometric Redshift Catalogs for the Lockman Hole Deep Field
Lutz, D.; Burwitz, V.; Salvato, M. +9 more
We present broadband photometry and photometric redshifts for 187,611 sources located in ~0.5 deg2 in the Lockman Hole area. The catalog includes 388 X-ray-detected sources identified with the very deep XMM-Newton observations available for an area of 0.2 deg2. The source detection was performed on the R c-, z'-, a…
It's Alive! The Supernova Impostor 1961V
Van Dyk, Schuyler D.; Matheson, Thomas
Reports of the death of the precursor of supernova (SN) 1961V in NGC 1058 are exaggerated. Consideration of the best astrometric data shows that the star, known as "Object 7," lies at the greatest proximity to SN 1961V and is the likely survivor of the "SN impostor" super-outburst. SN 1961V does not coincide with a neighboring radio source and is …
Oxygen and hydrogen ion abundance in the near-Earth magnetosphere: Statistical results on the response to the geomagnetic and solar wind activity conditions
Dandouras, I.; Daly, P. W.; Kistler, L. M. +4 more
The composition of ions plays a crucial role for the fundamental plasma properties in the terrestrial magnetosphere. We investigate the oxygen-to-hydrogen ratio in the near-Earth magnetosphere from -10 RE < XGSE < 10 RE. The results are based on seven years of ion flux measurements in the energy range ∼10 keV…