Search Publications
Lyα luminosity functions at redshift z ≈ 4.5
Finkelstein, Steven L.; Tilvi, Vithal; Zheng, Zhen-Ya +7 more
We present a spectroscopically confirmed sample of Lyman α emitting galaxies (LAEs) at z ∼ 4.5 in the Extended Chandra Deep Field-South (ECDFS), which we combine with a sample of z ∼ 4.5 LAEs from previous narrow-band surveys from the Large Area Lyman Alpha (LALA) survey to build a unified Lyα luminosity function. We spectroscopically observed 64 …
X-ray and radio observations of the magnetar Swift J1834.9-0846 and its dust-scattering halo
Tiengo, A.; Götz, D.; Mereghetti, S. +13 more
We present a long-term study of the 2011 outburst of the magnetar Swift J1834.9-0846 carried out using new Chandra observations, as well as all the available Swift, RXTE and XMM-Newton data. The last observation was performed on 2011 November 12, about 100 d after the onset of the bursting activity that had led to the discovery of the source on 20…
Herschel limits on far-infrared emission from circumstellar dust around three nearby type Ia supernovae.
Amanullah, R.; Goobar, A.; Johansson, J.
We report upper limits on dust emission at far-infrared (IR) wavelengths from three nearby Type Ia supernovae: SNe 2011by, 2011fe and 2012cg. Observations were carried out at 70 and 160 µm with the Photodetector Array Camera and Spectrometer onboard the Herschel Space Observatory. None of the supernovae were detected in the far-IR, allowing …
Polycyclic aromatic hydrocarbons in spatially resolved extragalactic star-forming complexes
Wiebe, D. S.; Boley, P. A.; Khramtsova, M. S. +1 more
The abundance of polycyclic aromatic hydrocarbons (PAHs) in low- and high-metallicity galaxies has been widely discussed since the time when detailed infrared data for extragalactic objects were first obtained. On the scales of entire galaxies, a smaller PAH abundance in lower metallicity galaxies is often observed. We study this relationship for …
The ALHAMBRA survey: reliable morphological catalogue of 22 051 early- and late-type galaxies
Cepa, J.; Infante, L.; Molino, A. +29 more
Advanced Large Homogeneous Area Medium Band Redshift Astronomical (ALHAMBRA) is photometric survey designed to trace the cosmic evolution and cosmic variance. It covers a large area of ∼4 deg2 in eight fields, where seven fields overlap with other surveys, allowing us to have complementary data in other wavelengths. All observations wer…
A wind-shell interaction model for multipolar planetary nebulae
López, J. A.; Steffen, W.; Koning, N. +4 more
We explore the formation of multipolar structures in planetary and pre-planetary nebulae from the interaction of a fast post-asymptotic giant branch wind with a highly inhomogeneous and filamentary shell structure assumed to form during the final phase of the high-density wind. The simulations were performed with a new hydrodynamics code integrate…
Evolutionary paths among different red galaxy types at 0.3 < z < 1.5 and the late buildup of massive E-S0s through major mergers
Barro, Guillermo; Pérez-González, Pablo G.; Eliche-Moral, M. Carmen +11 more
Some recent observations seem to disagree with hierarchical theories of galaxy formation about the role played by major mergers in the late buildup of massive E-S0s. We re-address this question by analysing the morphology, structural distortion level and star formation enhancement of a sample of massive galaxies (M* > 5 × 1010
The NGC 5253 star cluster system - I. Standard modelling and infrared-excess sources
Östlin, Göran; de Grijs, Richard; Zackrisson, Erik +1 more
Using high-resolution Hubble Space Telescope data, we re-examine the fundamental properties (ages, masses and extinction values) of the rich star cluster population in the dwarf starburst galaxy NGC 5253. The gain in resolution compared to previous studies is of order a factor of 2 in both spatial dimensions, while our accessible wavelength range …
Very deep spectroscopy of the bright Saturn nebula NGC 7009 - II. Analysis of the rich optical recombination spectrum
Liu, X. -W.; Fang, X.
In Paper I, we presented a deep, long-slit spectrum of the bright Saturn nebula NGC 7009. Numerous permitted lines emitted by the C+, N+, O+ and Ne+ ions were detected. Gaussian profile fitting to the spectrum yielded more than 1000 lines, the majority of which are optical recombination lines (ORLs) of h…
Starburst and old stellar populations in the z ≃ 3.8 radio galaxies 4C 41.17 and TN J2007-1316
Seymour, N.; Nesvadba, N.; De Breuck, C. +6 more
Using the new evolutionary code PÉGASE.3, we undertook an evolutionary spectral synthesis of the optical-IR-submm spectral energy distribution of two distant (z = 3.8) radio galaxies, 4C 41.17 and TN J2007-1316. These two radio galaxies were selected from the HeRGÉ (Herschel Radio Galaxies Evolution) Project in particular for their faint active ga…