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RCS2 J232727.6-020437: An Efficient Cosmic Telescope at z=0.6986
Sharon, K.; Schrabback, T.; Hoag, A. +13 more
We present a detailed gravitational lens model of the galaxy cluster RCS2 J232727.6-020437. Due to cosmological dimming of cluster members and intra-cluster light, its high redshift (z = 0.6986) makes it ideal for studying high-redshift background galaxies. Using new Advanced Camera for Surveys and WFC3/IR Hubble Space Telescope data, we identify …
Rethinking a Mysterious Molecular Cloud
Imara, N.
I present high-resolution column density maps of two molecular clouds (MCs) having strikingly different star formation rates. To better understand the unusual, massive G216-2.5, an MC with no massive star formation, the distribution of its molecular gas is compared to that of the Rosette MC. Far-infrared data from Herschel are used to derive N(H
Updated 24 µm Period-Luminosity Relation Derived from Galactic Cepheids
Ngeow, Chow-Choong; Kanbur, Shashi M.; Bhardwaj, Anupam +2 more
In this work, we updated the catalog of Galactic Cepheids with 24 µm photometry by cross-matching the positions of known Galactic Cepheids to the recently released MIPSGAL point source catalog. We have added 36 new sources featuring MIPSGAL photometry in our analysis, thus increasing the existing sample to 65. Six different sources of compil…
Doubts about the crucial role of the rising-tube mechanism in the formation of sunspot groups
Ishikawa, R.; Getling, A. V.; Buchnev, A. A.
Some preliminary processing results are presented for a dataset obtained with the Solar Optical Telescope on the Hinode satellite. The idea of the project is to record, nearly simultaneously, the full velocity and magnetic-field vectors in growing active regions and sunspot groups at a photospheric level. Our ultimate aim is to elaborate observati…
A study of the past dynamics of comet 67P/Churyumov-Gerasimenko with fast Lyapunov indicators
Guzzo, Massimiliano; Lega, Elena
Comet 67P/Churyumov-Gerasimenko is the target of the Rosetta mission. On the basis of backward numerical integrations of a large set of simulated comets whose initial conditions were obtained from small variations of the orbital parameters of comet 67P, and using the analysis of suitable chaos indicators, we detect the phase-space structure of the…
Stellar Populations and the Star Formation Histories of LSB Galaxies. V. WFC3 Color-Magnitude Diagrams
Schombert, James; McGaugh, Stacy
We present WFC3 observations of three low surface brightness (LSB) galaxies from the Schombert et al. LSB catalog that are within 11 Mpc of the Milky Way. Deep imaging at F336W, F555W, and F814W allow the construction of the V - I color-magnitude diagrams (CMD) to MI = -2. Overall 1869, 465, and 501 stellar sources are identified in the…
A Catalog of Point Sources Toward NGC 1333
Rebull, L. M.
I present a catalog of point-source objects toward NGC 1333, resolving a wide variety of confusion about source names (and occasionally positions) in the literature. I incorporate data from optical to radio wavelengths, but focus most of the effort on being complete and accurate from J (1.25 µm) to 24 µm. The catalog encompasses 52^\ci…
Spectral Imaging of Galaxy Clusters with Planck
Rasia, E.; Bourdin, H.; Mazzotta, P.
The Sunyaev-Zeldovich (SZ) effect is a promising tool for detecting the presence of hot gas out to the galaxy cluster peripheries. We developed a spectral imaging algorithm dedicated to the SZ observations of nearby galaxy clusters with Planck, with the aim of revealing gas density anisotropies related to the filamentary accretion of materials, or…
Sulphur-bearing species in molecular clouds
Bilalbegović, G.; Baranović, G.
We study several molecules that could help in the solution of the missing sulphur problem in dense clouds and circumstellar regions, as well as in the clarification of the sulphur chemistry in comets. These sulphur molecules are the trimer (CH2S)3 and the tetramer (CH2S)4 of thioformaldehyde, pentathian …
Ten years of Martian nitric oxide nightglow observations
Montmessin, Franck; Bertaux, Jean-Loup; Stiepen, Arnaud +2 more
We present 10 years of Martian NO nightglow Spectroscopy for Investigation of Characteristics of the Atmosphere of Mars observations in limb and stellar occultation modes. The NO nightglow is used as a tracer of the summer-to-winter hemispherical circulation in the upper atmosphere of Mars. Its distribution roughly follows the curve latitude = -80…