Search Publications
Kinematics of powerful jets from intermediate-mass protostars in the Carina nebula
Smith, Nathan; Reiter, Megan
We present measurements of proper motions and radial velocities of four powerful Herbig-Haro (HH) jets in the Carina nebula: HH 666, HH 901, HH 902, and HH 1066. Two epochs of Hubble Space Telescope imaging separated by a time baseline of ∼4.4 yr provide proper motions that allow us to measure the transverse velocities of the jets, while ground-ba…
A panchromatic survey of post-starburst mergers: searching for feedback
De Propris, Roberto; Melnick, Jorge
We consider the morphology, stellar populations, structure and AGN activity of 10 post-starburst (K+A) galaxies with Hubble Space Telescope (HST) observations, full spectral coverage in the optical, spectral energy distributions from 0.2 to 160 µm, X-ray and radio data. Our results show that the post-starburst galaxy (PSG) phenomenon is rela…
On the presence of ultrafast outflows in the WAX sample of Seyfert galaxies.
Cappi, M.; Tombesi, F.
The study of winds in active galactic nuclei (AGNs) is of utmost importance as they may provide the long sought-after link between the central black hole and the host galaxy, establishing the AGN feedback. Recently, Laha et al. reported the X-ray analysis of a sample of 26 Seyferts observed with XMM-Newton, which are part of the so-called warm abs…
Discovery of SXP 265, a Be/X-ray binary pulsar in the Wing of the Small Magellanic Cloud
Haberl, F.; Greiner, J.; Udalski, A. +5 more
We identify a new candidate for a Be/X-ray binary in the XMM-Newton slew survey and archival Swift observations that is located in the transition region of the Wing of the Small Magellanic Cloud and the Magellanic Bridge. We investigated and classified this source with follow-up XMM-Newton and optical observations. We model the X-ray spectra and s…
Constraints to the magnetospheric properties of T Tauri stars - I. The C II], Fe II] and Si II] ultraviolet features
López-Martínez, Fatima; Gómez de Castro, Ana Inés
The C II] feature at ∼2325 Å is very prominent in the spectra of T Tauri stars (TTSs). This feature is a quintuplet of semiforbidden transitions excited at electron temperatures around 10 000 K that, together with the nearby Si II] and Fe II] features, provides a reliable optically thin tracer for accurate measurement of the plasma properties in t…
The role of major mergers in the size growth of intermediate-mass spheroids
Ryan, R. E.; O'Connell, R. W.; Koekemoer, A. M. +11 more
We study of the role of `major' mergers (mass ratios >1: 4) in driving size growth in high-redshift (1 < z < 2) spheroidal galaxies (SGs) with stellar masses between 109.5 and 1010.7 M⊙. This is a largely unexplored mass range at this epoch, containing the progenitors of more massive SGs on which the bulk …
Emission mechanism of GeV-quiet soft gamma-ray pulsars: a case for peculiar geometry?
Leung, Gene C. K.; Cheng, K. S.; Takata, J. +2 more
There is a growing new class of young spin-down powered pulsars called GeV-quiet soft gamma-ray pulsar; (1) spectral turnover appears around 10 MeV, (2) the X-ray spectra of below 20 keV can be described by power law with a photon index of around 1.2 and (3) the light curve in X-ray/soft gamma-ray bands shows single broad pulse. Their emission pro…
Non-Gaussianity of the cosmic infrared background anisotropies - II. Predictions of the bispectrum and constraints forecast
Aghanim, N.; Lacasa, F.; Pénin, A.
Using a full analytical computation of the bispectrum based on the halo model together with the halo occupation number, we derive the bispectrum of the cosmic infrared background (CIB) anisotropies that trace the clustering of dusty-star-forming galaxies. We focus our analysis on wavelengths in the far-infrared and the sub-millimeter typical of th…
Molecular gas properties of UV-bright star-forming galaxies at low redshift
Basu-Zych, Antara; Overzier, Roderik A.; Martin, D. Christopher +2 more
Lyman break analogues (LBAs) are a population of star-forming galaxies at low redshift (z ∼ 0.2) selected in the ultraviolet (UV). These objects present higher star formation rates and lower dust extinction than other galaxies with similar masses and luminosities in the local universe. In this work, we present results from a survey with the Combin…
The Herschel view of circumstellar discs: a multiwavelength study of Chamaeleon-I
Ray, Tom; Scholz, Alexander; Rodgers-Lee, Donna +1 more
We present the results of a multiwavelength study of circumstellar discs around 44 young stellar objects in the 3 myr old nearby Chamaeleon-I star-forming region. In particular, we explore the far-infrared/submm regime using Herschel fluxes. We show that Herschel fluxes at 160-500 µm can be used to derive robust estimates of the disc mass. T…