Search Publications
Structure and substructure analysis of DAFT/FADA galaxy clusters in the [0.4-0.9] redshift range
Ilbert, O.; Schirmer, M.; Allam, S. +29 more
Context. The DAFT/FADA survey is based on the study of ~90 rich (masses found in the literature >2 × 1014 M⊙) and moderately distant clusters (redshifts 0.4 < z < 0.9), all with HST imaging data available. This survey has two main objectives: to constrain dark energy (DE) using weak lensing tomography on galaxy clust…
A New Sigmoid Catalog from Hinode and the Solar Dynamics Observatory: Statistical Properties and Evolutionary Histories
DeLuca, E. E.; Savcheva, A. S.; McKillop, S. C. +2 more
We present a new sigmoid catalog covering the duration of the Hinode mission and the Solar Dynamics Observatory (SDO) until the end of 2012. The catalog consists of 72 mostly long-lasting sigmoids. We collect and make available all X-ray and EUV data from Hinode, SDO, and the Solar TErrestrial RElations Observatory (STEREO), and we determine the s…
First Detection of the White Dwarf Cooling Sequence of the Galactic Bulge
Salaris, M.; Anderson, J.; Pietrinferni, A. +13 more
We present Hubble Space Telescope data of the low-reddening Sagittarius window in the Galactic bulge. The Sagittarius Window Eclipsing Extrasolar Planet Search field (~3'× 3'), together with three more Advanced Camera for Surveys and eight Wide-Field Camera 3 fields, were observed in the F606W and F814W filters, approximately every two weeks for 2…
Delivery of Dust Grains from Comet C/2013 A1 (Siding Spring) to Mars
Samarasinha, Nalin H.; Bauer, James M.; Li, Jian-Yang +7 more
Comet C/2013 A1 (Siding Spring) will have a close encounter with Mars on 2014 October 19. We model the dynamical evolution of dust grains from the time of their ejection from the comet nucleus to the close encounter with Mars, and determine the flux at Mars. Constraints on the ejection velocity from Hubble Space Telescope observations indicate tha…
Warm molecular gas temperature distribution in six local infrared bright Seyfert galaxies
Spinoglio, Luigi; Pereira-Santaella, Miguel; van der Werf, Paul P. +1 more
We simultaneously analyze the spectral line energy distributions (SLEDs) of CO and H2 of six local luminous infrared (IR) Seyfert galaxies. For the CO SLEDs, we used new Herschel/SPIRE FTS data (from J = 4-3 to J = 13-12) and ground-based observations for the lower-J CO transitions. The H2 SLEDs were constructed using archiva…
Models of solar surface dynamics: impact on eigenfrequencies and radius
Morel, P.; Turck-Chièze, S.; Piau, L. +3 more
We study the effects of different descriptions of the solar surface convection on the eigenfrequencies of p modes. 1D evolution calculations of the whole Sun and 3D hydrodynamic and magnetohydrodynamic simulations of the current surface are performed. These calculations rely on realistic physics. Averaged stratifications of the 3D simulations are …
Molecular gas in the centre of nearby galaxies from VLT/SINFONI integral field spectroscopy - II. Kinematics
Saglia, R. P.; Nowak, N.; Thomas, J. +6 more
We present an analysis of the H2 emission-line gas kinematics in the inner ≲4 arcsec radius of six nearby spiral galaxies, based on adaptive optics-assisted integral-field observations obtained in the K band with SINFONI/VLT. Four of the six galaxies in our sample display ordered H2 velocity fields, consistent with gas moving…
The Size and Shape of the Oblong Dwarf Planet Haumea
Brown, Michael E.; Lockwood, Alexandra C.; Stansberry, John
We use thermal radiometry and visible photometry to constrain the size, shape, and albedo of the large Kuiper belt object Haumea. The correlation between the visible and thermal photometry demonstrates that Haumea's high amplitude and quickly varying optical light curve is indeed due to Haumea's extreme shape, rather than large scale albedo variat…
The Panchromatic Hubble Andromeda Treasury. VII. The Steep Mid-ultraviolet to Near-infrared Extinction Curve in the Central 200 pc of the M31 Bulge
Olsen, Knut; Fouesneau, Morgan; Lauer, Tod R. +8 more
We measure the extinction curve in the central 200 pc of M31 at mid-ultraviolet to near-infrared wavelengths (from 1928 Å to 1.5 µm), using Swift/UVOT and Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3)/Advanced Camera for Surveys (ACS) observations in 13 bands. Taking advantage of the high angular resolution of the HST/WFC3 and ACS …
Discovery of recombining plasma in the supernova remnant 3C 391
Takahashi, Tadayuki; Koyama, Katsuji; Nakashima, Shinya +2 more
Recent X-ray study of middle-aged supernova remnants (SNRs) reveals strong radiative recombination continua (RRCs) associated with overionized plasmas, which origin still remains uncertain. We report a discovery of an RRC in the middle-aged SNR 3C 391. If the X-ray spectrum is fitted with a two-temperature plasma model in collisional ionization eq…