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Synthetic stellar populations: single stellar populations, stellar interior models and primordial protogalaxies
Jimenez, Raul; Dunlop, James S.; Peacock, John A. +2 more
We present a new set of stellar interior and synthesis models for predicting the integrated emission from stellar populations in star clusters and galaxies of arbitrary age and metallicity. This work differs from existing spectral synthesis codes in a number of important ways, namely (1) the incorporation of new stellar evolutionary tracks, with s…
Sensitivity of Acoustic Wave Travel Times to Sound-Speed Perturbations in the Solar Interior
Kosovichev, A. G.; Birch, A. C.; Duvall, T. L., Jr.
For time-distance helioseismology, it is important to establish the relationship between the travel times of acoustic waves propagating between different points on the solar surface through the solar interior and local perturbations to the sound speed in the propagation region. We use the Born approximation to derive a general expression for the l…
Chain Galaxies in the Tadpole Advanced Camera for Surveys Field
Elmegreen, Bruce G.; Elmegreen, Debra Meloy; Sheets, Clara M.
Colors and magnitudes were determined for 69 chain galaxies, 58 other linear structures, 32 normal edge-on galaxies, and all of their large star formation clumps in the Hubble Space Telescope Advanced Camera for Surveys field of the Tadpole galaxy. Redshifts of 0.5-2 are inferred from comparisons with published color-evolution models. The linear g…
Deep SAURON spectral imaging of the diffuse Lyman α halo LAB1 in SSA 22
Sullivan, M.; Chapman, S.; Bower, R. G. +6 more
We have used the SAURON panoramic integral field spectrograph to study the structure of the Lyα emission-line halo, LAB1, surrounding the submillimetre galaxy SMM J221726+0013. This emission-line halo was discovered during a narrow-band imaging survey of the z= 3.1 large-scale structure in the SSA 22 region. Our observations trace the emission hal…
The Environment of the Optically Brightest Herbig Ae Star, HD 104237
Apai, D.; Stecklum, B.; Wang, Hongchi +16 more
We investigate the environment of the nearest Herbig Ae star, HD 104237, with a multiwavelength combination of optical coronagraphic, near-IR, and mid-IR imaging supported by optical, UV, and far-ultraviolet spectroscopy. We confirm the presence of T Tauri stars associated with the Herbig Ae star HD 104237, noted by Feigelson et al. We find that t…
Measurements of accretion disc corona size in LMXB: consequences for Comptonization and LMXB models
Church, M. J.; Bałucińska-Church, M.
We present results of measurements of the radial extent of the accretion disc corona in low-mass X-ray binaries (LMXB), i.e. of the radial extent of the thin, hot ADC above the accretion disc. These results prove conclusively the extended nature of the ADC, with radial extent varying from 20 000 km in the faintest sources to 700 000 km in the brig…
The (un)resolved X-ray background in the Lockman Hole
Barcons, X.; Fabian, A. C.; Hasinger, G. +3 more
Most of the soft and a growing fraction of the harder X-ray background has been resolved into emission from point sources, yet the resolved fraction above 7 keV has only been poorly constrained. We use ~700 ks of XMM-Newton observations of the Lockman Hole and a photometric approach to estimate the total flux attributable to resolved sources in a …
Complex Structure of Galaxy Cluster A1689: Evidence for a Merger from X-Ray Data?
Madejski, G. M.; Andersson, K. E.
A1689 is a galaxy cluster at z=0.183 for which previous measurements of its mass by using various techniques gave discrepant results. We present a new detailed measurement of the mass with the data based on X-ray observations with the European Photon Imaging Camera aboard the XMM-Newton Observatory, determined by using an unparameterized deproject…
The Ionized Gas in Local Starburst Galaxies: Global and Small-Scale Feedback from Star Formation
Conselice, Christopher J.; Calzetti, Daniela; Gallagher, John S., III +4 more
The small- and intermediate-scale structure and the fraction of the interstellar medium (ISM) ionized by nonradiative processes are investigated in a small sample of four local starburst galaxies, imaged with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2. The sample comprises three dwarf galaxies, NGC 3077, 4214, and 5253, and one…
The young stellar population in the Serpens Cloud Core: An ISOCAM survey
Prusti, T.; Perault, M.; Olofsson, G. +18 more
We present results from an ISOCAM survey in the two broad band filters LW2 (5-8.5 µm) and LW3 (12-18 µm) of a 0.13 square degree coverage of the Serpens Main Cloud Core. A total of 392 sources were detected in the 6.7 µm band and 139 in the 14.3 µm band to a limiting sensitivity of ∼2 mJy. We identified 53 Young Stellar Obj…