Search Publications
Stellar Populations and the Star Formation Histories of LSB Galaxies: IV Spitzer Surface Photometry of LSB Galaxies
McGaugh, Stacy; Schombert, James M.
Surface photometry at 3.6 µm is presented for 61 low surface brightness (LSB) galaxies (µ o <19 3.6 µm mag arcsecs-2). The sample covers a range of luminosity from -11 to -22 in M 3.6 and size from 1 to 25 kpc. The morphologies in the mid-IR are comparable to those in the optical with 3.6 &micr…
Mineralogy of young lunar mare basalts: Assessment of temporal and spatial heterogeneity using M3 data from Chandrayaan-1
Murty, Sripada V. S.; Srivastava, Neeraj; Varatharajan, Indhu
A comparative assessment of the mineralogy of young basalts (∼1.2 Ga to ∼2.8 Ga) from the western nearside, Moscoviense basin, and the Orientale basin of the Moon has been made using Level 2 Moon Mineralogy Mapper (M3) data from the Chandrayaan-1 mission. Spectral data characteristics of the individual units have been generated from fre…
GROND coverage of the main peak of gamma-ray burst 130925A
van Eerten, H.; Greiner, J.; Hurley, K. +23 more
Aims: Prompt or early optical emission in gamma-ray bursts (GRBs) is notoriously difficult to measure, and observations of the dozen cases show a large variety of properties. Yet, such early emission promises to help us achieve a better understanding of the GRB emission process(es).
Methods: We performed dedicated observations of the ult…
CoRoT 105906206: a short-period and totally eclipsing binary with a δ Scuti type pulsator
Gandolfi, D.; Hatzes, A. P.; Lehmann, H. +2 more
Aims: Eclipsing binary systems with pulsating components allow determination of several physical parameters of the stars, such as mass and radius, that can be used to constrain the modeling of stellar interiors and evolution when combined with the pulsation properties. We present the results of the study of CoRoT 105906206, an eclipsing binar…
Study of Extreme-ultraviolet Emission and Properties of a Coronal Streamer from PROBA2/SWAP, Hinode/EIS and Mauna Loa Mk4 Observations
Slemzin, V.; Goryaev, F.; Vainshtein, L. +1 more
Wide-field extreme-ultraviolet (EUV) telescopes imaging in spectral bands sensitive to 1 MK plasma on the Sun often observe extended, ray-like coronal structures stretching radially from active regions to distances of 1.5-2 R ⊙, which represent the EUV counterparts of white-light streamers. To explain this phenomenon, we investigated th…
The Peculiar Galactic Center Neutron Star X-Ray Binary XMM J174457-2850.3
Altamirano, D.; Degenaar, N.; Wijnands, R. +6 more
The recent discovery of a millisecond radio pulsar experiencing an accretion outburst similar to those seen in low mass X-ray binaries, has opened up a new opportunity to investigate the evolutionary link between these two different neutron star manifestations. The remarkable X-ray variability and hard X-ray spectrum of this object can potentially…
Thin current sheets with strong bell-shape guide field: Cluster observations and models with beams
Malova, H. V.; Petrukovich, A. A.; Artemyev, A. V. +1 more
We study the kinetic structure of intense ion-scale current sheets with strong electron currents and the guide field having a bell-shape profile. We consider four crossings of the Earth magnetotail current sheet by the Cluster mission in 2003. The thickness of these current sheets is about the ion inertial length and significantly smaller than the…
Power-law cosmology, SN Ia, and BAO
Halenka, Vitali; Dolgov, Aleksander; Tkachev, Igor
We revise observational constraints on the class of models of modified gravity which at low redshifts lead to a power-law cosmology. To this end we use available public data on Supernova Ia and on baryon acoustic oscillations. We show that the expansion regime a(t) ~ tβ with β close to 3/2 in a spatially flat universe is a good fit to t…
Automatic Classification of Time-variable X-Ray Sources
Gaensler, B. M.; Murphy, Tara; Lo, Kitty K. +1 more
To maximize the discovery potential of future synoptic surveys, especially in the field of transient science, it will be necessary to use automatic classification to identify some of the astronomical sources. The data mining technique of supervised classification is suitable for this problem. Here, we present a supervised learning method to automa…
Globular clusters of NGC 3115 in the near-infrared. Demonstrating the correctness of two opposing scenarios
Chies-Santos, Ana L.; Blakeslee, John P.; Kuntschner, Harald +4 more
We combined new near-infrared VLT/HAWK-I data of the globular clusters (GCs) in the isolated edge-on S0 galaxy