Search Publications
Baade-Wesselink distances to Galactic and Magellanic Cloud Cepheids and the effect of metallicity
Groenewegen, M. A. T.
Context. The metallicity dependence of the Cepheid period-luminosity (PL) relation is of importance in establishing the extragalactic distance scale.
Aims: The aim of this paper is to investigate the metallicity dependence of the PL relation in V and K, based on a sample of 128 Galactic, 36 Large Magellanic Cloud (LMC), and 6 Small Magellanic…
The Anatomy of an Extreme Starburst within 1.3 Gyr of the Big Bang Revealed by ALMA
Maiolino, R.; Walter, F.; Riechers, D. +5 more
We present further analysis of the [C II] 158 µm fine structure line and thermal dust continuum emission from the archetype extreme starburst/active galactic nucleus (AGN) group of galaxies in the early universe, BRI 1202-0725 at z = 4.7, using the Atacama Large Millimeter Array. The group has long been noted for having a closely separated (…
Velocity width measurements of the coolest X-ray emitting material in the cores of clusters, groups and elliptical galaxies
Fabian, A. C.; Sanders, J. S.
We examine the velocity width of cool X-ray emitting material using XMM-Newton Reflection Grating Spectrometer (RGS) spectra of a sample of clusters and group of galaxies and elliptical galaxies. Improving on our previous analyses, we apply a spectral model which accounts for broadening due to the spatial extent of the source. With both convention…
Peripheral downflows in sunspot penumbrae
Solanki, S. K.; Lagg, A.; van Noort, M. +1 more
Context. Sunspot penumbrae show high-velocity patches along the periphery.
Aims: The high-velocity downflow patches are believed to be the return channels of the Evershed flow. We aim to investigate their structure in detail using Hinode SOT/SP observations.
Methods: We employ Fourier interpolation in combination with spatially coupled h…
An improved model for the infrared emission from the zodiacal dust cloud: cometary, asteroidal and interstellar dust
Rowan-Robinson, M.; May, B.
We model the infrared emission from zodiacal dust detected by the IRAS and COBE missions, with the aim of estimating the relative contributions of asteroidal, cometary and interstellar dust to the zodiacal cloud. Our most important result is the detection of an isotropic component of foreground radiation due to the interstellar dust.
The dust…No anticorrelation between cyclotron line energy and X-ray flux in 4U 0115+634
Klochkov, D.; Wolff, M. T.; Wilms, J. +18 more
We report on an outburst of the high mass X-ray binary 4U 0115+634 with a pulse period of 3.6 s in 2008 March/April as observed with RXTE and INTEGRAL. During the outburst the neutron star's luminosity varied by a factor of 10 in the 3-50 keV band. In agreement with earlier work we find evidence of five cyclotron resonance scattering features at ~…
On the two high-metallicity DLAs at z = 2.412 and 2.583 towards Q 0918+1636
Vestergaard, M.; Fynbo, J. P. U.; Krühler, T. +9 more
The quasar Q0918+1636 (z = 3.07) has two intervening high-metallicity Damped Lyman α Absorbers (DLAs) along the line of sight, at redshifts of z = 2.412 and 2.583. The z = 2.583 DLA is located at a large impact parameter of 16.2 kpc, and despite this large impact parameter it has a very high metallicity (consistent with solar), a substantial fract…
The Bivariate Size-Luminosity Relations for Lyman Break Galaxies at z ~ 4-5
Ferguson, Henry C.; Ravindranath, Swara; Huang, Kuang-Han +1 more
We study the bivariate size-luminosity distribution of Lyman break galaxies (LBGs) selected at redshifts around 4 and 5 in GOODS and the HUDF fields. We model the size-luminosity distribution as a combination of log-normal distribution (in size) and Schechter function (in luminosity), therefore it enables a more detailed study of the selection eff…
The Herschel Virgo Cluster Survey - XII. FIR properties of optically selected Virgo cluster galaxies
Ciesla, L.; Bomans, D. J.; Boquien, M. +24 more
The Herschel Virgo Cluster Survey (HeViCS) is the deepest, confusion-limited survey of the Virgo Cluster at far-infrared (FIR) wavelengths. The entire survey at full depth covers ∼55 deg2 in five bands (100-500 µm), encompassing the areas around the central dominant elliptical galaxies (M87, M86 and M49) and extends as far as the …
On the association between core-collapse supernovae and H ii regions
Crowther, Paul A.
Previous studies of the location of core-collapse supernovae (ccSNe) in their host galaxies have variously claimed an association with H ii regions; no association or an association only with hydrogen-deficient ccSNe. Here, we examine the immediate environments of 39 ccSNe whose positions are well known in nearby (≤15 Mpc), low-inclination (≤65°) …