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The Photometric Study of a Neglected Near Contact Binary: BS Vulpeculae
Zejda, M.; Liška, J.; Qian, S. -B. +3 more
We present a detailed study of the close eclipsing binary BS Vulpeculae. Although it is relatively bright (V: 10.9-11.6 mag) and belongs to short-periodic variable stars (P = 0.48 days), it is rather neglected. To perform a thorough period analysis, we collected all available photometric observations that span the time interval of 1898-2010. Obser…
Spin-down Measurement of PSR J1813-1749: The Energetic Pulsar Powering HESS J1813-178
Camilo, F.; Gotthelf, E. V.; Halpern, J. P.
Two new X-ray timing observations of the 44.7 ms pulsar in G12.82-0.02/HESS J1813-178 were obtained with Chandra and XMM-Newton to determine its precise spin-down rate. With a period derivative of \dot{P} = 1.265\times 10^{-13}, PSR J1813-1749 is the third most energetic pulsar in the Galaxy, having spin-down luminosity \dot{E} = 5.6\times 10^{37}…
H2O line mapping at high spatial and spectral resolution. Herschel observations of the VLA 1623 outflow
Liseau, R.; Benedettini, M.; van Dishoeck, E. F. +12 more
Context. Apart from being an important coolant, water is known to be a tracer of high-velocity molecular gas. Recent models predict relatively high abundances behind interstellar shockwaves. The dynamical and physical conditions of the water emitting gas, however, are not fully understood yet. Using the Herschel Space Observatory, it is now possib…
A simple empirically motivated template for the thermal Sunyaev-Zel'dovich effect
Efstathiou, George; Migliaccio, Marina
We develop a model for the power spectrum of unresolved clusters of galaxies arising from the thermal Sunyaev-Zel'dovich (tSZ) effect. The model is based on a 'universal' gas pressure profile constrained by X-ray observations and includes a parameter to describe departures from self-similar evolution. The model is consistent with recent Planck obs…
Herschel PACS Observations and Modeling of Debris Disks in the Tucana-Horologium Association
Ménard, F.; Dent, W. R. F.; Krivov, A. V. +9 more
We present Herschel PACS photometry of 17 B- to M-type stars in the 30 Myr old Tucana-Horologium Association. This work is part of the Herschel Open Time Key Programme "Gas in Protoplanetary Systems". 6 of the 17 targets were found to have infrared excesses significantly greater than the expected stellar IR fluxes, including a previously unknown d…
A decrease of the gas exchanges between galaxies and the intergalactic medium, from 12 to 6 billion years ago
Flores, H.; Hammer, F.; Puech, M. +2 more
Using a representative sample of 65 intermediate-mass galaxies at z∼ 0.6, we have investigated the interplay between the main ingredients of chemical evolution: metal abundance, gas mass, stellar mass and star formation rate (SFR). All quantities have been estimated using deep spectroscopy and photometry from ultraviolet to infrared and assuming a…
Herschel far-IR observations of the Chamaeleon molecular cloud complex . Chamaeleon I: A first view of young stellar objects in the cloud
Prusti, T.; Pilbratt, G. L.; André, Ph. +12 more
Context. The Herschel Gould Belt survey of nearby star forming regions is providing great insights into the early stages of the formation and the evolution of stars and their circumstellar disks. The Chamaeleon I dark cloud is an elongated region of dense dust and gas where star formation is ongoing in two centres, a northern region centred on Ced…
A Refined QSO Selection Method Using Diagnostics Tests: 663 QSO Candidates in the Large Magellanic Cloud
Trichas, Markos; Alcock, Charles; Rowan-Robinson, Michael +4 more
We present 663 QSO candidates in the Large Magellanic Cloud (LMC) selected using multiple diagnostics. We started with a set of 2566 QSO candidates selected using the methodology presented in our previous work based on time variability of the MACHO LMC light curves. We then obtained additional information for the candidates by crossmatching them w…
The Nature of the UV/Optical Emission of the Ultraluminous X-Ray Source in Holmberg II
Tao, Lian; Feng, Hua; Grisé, Fabien +1 more
We report on UV and X-ray spectroscopy and broadband optical observations of the ultraluminous X-ray source in Holmberg II. Fitting various stellar spectral models to the combined, non-simultaneous data set, we find that normal metallicity stellar spectra are ruled out by the data, while low-metallicity, Z = 0.1 Z ⊙, late O-star spectra…
The HST/ACS Coma Cluster Survey. VIII. Barred Disk Galaxies in the Core of the Coma Cluster
Ferguson, Henry C.; Mobasher, Bahram; Balcells, Marc +16 more
We use high-resolution (~0farcs1) F814W Advanced Camera for Surveys (ACS) images from the Hubble Space Telescope ACS Treasury survey of the Coma cluster at z ~ 0.02 to study bars in massive disk galaxies (S0s), as well as low-mass dwarf galaxies in the core of the Coma cluster, the densest environment in the nearby universe. Our study helps to con…