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Identifying Type IIn supernova progenitors in our Galaxy: the circumstellar environment of the Galactic luminous blue variable candidate Gal 026.47+0.02
Paladini, R.; Umana, G.; Agliozzo, C. +7 more
New data from the Herschel Infrared Galactic Plane Survey (Hi-GAL) and the Expanded Very Large Array, together with ancillary multifrequency data from different archives, have provided a comprehensive picture of the circumstellar envelope (CSE) surrounding the Galactic luminous blue variable (LBV) candidate Gal 026.47+0.02. The high angular resolu…
Old Massive Globular Clusters and the Stellar Halo of the Dwarf Starburst Galaxy NGC 4449
Caldwell, Nelson; Strader, Jay; Seth, Anil C.
We use Hubble Space Telescope imaging to show that the nearby dwarf starburst galaxy NGC 4449 has an unusual abundance of luminous red star clusters. Joint constraints from integrated photometry, low-resolution spectroscopy, dynamical mass-to-light ratios, and resolved color-magnitude diagrams provide evidence that some of these clusters are old g…
Lambert albedo retrieval and analyses over Aram Chaos from OMEGA hyperspectral imaging data
Liu, Yang; Arvidson, Raymond E.; Wolff, Michael J. +4 more
The DISORT radiative transfer model was used to retrieve Lambert albedos from 0.4 to 4.0 µm over hydrated sulfate deposits in Aram Chaos for the Mars Express OMEGA instrument. Albedos were also retrieved for a relatively anhydrous area to the north to use as a control for comparison to the hydrated sulfate spectra. Atmospheric gases and aero…
A Nearby Analog of z ~ 2 Compact Quiescent Galaxies with a Rotating Disk
Franx, Marijn; van Dokkum, Pieter; Bezanson, Rachel +1 more
Recent studies have identified a population of compact quiescent galaxies at z ~ 2. These galaxies are very rare today and establishing the existence of a nearby analog could allow us to study its structure in greater detail than is possible at high redshift. Here we present such a local analog, NGC 5845, which has a dynamical mass of M dyn
On the problem of Plasma Sheet Boundary Layer identification from plasma moments in Earth's magnetotail
Sauvaud, J. -A.; Grigorenko, E. E.; Koleva, R.
The problem of identification of the interface region between the lobe and the Plasma Sheet (PS) - the Plasma Sheet Boundary Layer (PSBL) - using ion moments and magnetic field data often arises in works devoted to statistical studies of various PSBL phenomena. Our experience in the identification of this region based on the analysis of ion veloci…
Multifrequency Radio Observations of SNR J0536-6735 (N 59B) with Associated Pulsar
Bozzetto, L. M.; Stupar, M.; Crawford, E. J. +2 more
We present a study of new Australian Telescope Compact Array (ATCA) observations of supernova remnant, SNR J0536-6735. This remnant appears to follow a shell morphology with a diameter of D=36×29 pc (with 1 pc uncertainty in each direction). There is an embedded HII region on the northern limb of the remnant which made various analysis and measure…
VLT and Suzaku observations of the Fermi pulsar PSR J1028-5819
Marelli, M.; Razzano, M.; Esposito, P. +4 more
Context. The launch of the Fermi Gamma-ray Space Telescope in 2008 opened new perspectives in the multi-wavelength studies of neutron stars, with more than 100 γ-ray pulsars having since been detected. While most Fermi pulsars had previously been observed in the X-rays with Chandra and XMM-Newton, optical observations with 8 m-class telescopes exi…
Tidal interaction vs. ram pressure stripping effects as seen in X-rays. Hot gas in group and cluster galaxies
Bomans, D. J.; Braine, J.; Ehle, M. +4 more
Context. Cluster and group spiral galaxies are very often affected by their environment. The hot intracluster/intragroup medium (ICM/IGM) and a high galaxy density can lead to perturbations of the galactic interstellar medium (ISM) due to ram pressure and/or tidal interaction effects. In radio polarimetry observations, both phenomena may manifest …
Ionized Gas in the First 10 kpc of the Interstellar Galactic Halo: Metal Ion Fractions
Howk, J. Christopher; Consiglio, S. Michelle
We present direct measures of the ionization fractions of several sulfur ions in the Galactic warm ionized medium (WIM). We obtained high-resolution ultraviolet absorption-line spectroscopy of post-asymptotic giant branch stars in the globular clusters Messier 3 [(l, b) = (42fdg2, +78fdg7), d = 10.2 kpc, and z = 10.0 kpc] and Messier 5 [(l, b) = (…
Sunyaev-Zel'dovich signal of the maxBCG SDSS galaxy clusters in WMAP
Rozo, Eduardo; Hao, Jiangang; Dodelson, Scott +1 more
The Planck Collaboration measured the Sunyaev-Zel’dovich decrement of optically selected clusters from the Sloan Digital Sky Survey, finding that it falls significantly below expectations based on existing mass calibration of the maxBCG galaxy clusters. Resolving this tension requires either the data to go up, or the theoretical expectations to co…