Search Publications
Combining physical galaxy models with radio observations to constrain the SFRs of high-z dusty star-forming galaxies
Franceschini, A.; Efstathiou, A.; Silva, L. +2 more
We complement our previous analysis of a sample of z ∼ 1-2 luminous and ultraluminous infrared galaxies [(U)LIRGs], by adding deep Very Large Array radio observations at 1.4 GHz to a large data set from the far-UV to the submillimetre, including Spitzer and Herschel data. Given the relatively small number of (U)LIRGs in our sample with high signal…
Sub-arcsec mid-IR observations of NGC 1614: Nuclear star formation or an intrinsically X-ray weak AGN?
Colina, L.; García-Burillo, S.; Herrero-Illana, R. +10 more
We present new mid-infrared (mid-IR) N-band spectroscopy and Q-band photometry of the local luminous IR galaxy NGC 1614, one of the most extreme nearby starbursts. We analyse the mid-IR properties of the nucleus (central 150 pc) and four regions of the bright circumnuclear (diameter∼600 pc) star-forming (SF) ring of this object. The nucleus differ…
Subaru and Swift observations of V652 Herculis: resolving the photospheric pulsation
Starling, R. L. C.; Jeffery, C. S.; McCormac, J. +4 more
High-resolution spectroscopy with the Subaru High Dispersion Spectrograph, and Swift ultraviolet photometry are presented for the pulsating extreme helium star V652 Her. Swift provides the best relative ultraviolet photometry obtained to date, but shows no direct evidence for a shock at ultraviolet or X-ray wavelengths. Subaru has provided high sp…
Disentangling the outflow and protostars in HH 900 in the Carina Nebula
Anderson, Jay; Smith, Nathan; Bally, John +2 more
HH 900 is a peculiar protostellar outflow emerging from a small, tadpole-shaped globule in the Carina Nebula. Previous Hα imaging with Hubble Space Telescope (HST)/Advanced Camera for Surveys showed an ionized outflow with a wide opening angle that is distinct from the highly collimated structures typically seen in protostellar jets. We present ne…
Cold parsec-scale gas in a zabs ∼ 0.1 sub-damped Lyman α with disparate H2 and 21-cm absorption
Momjian, E.; Muzahid, S.; Srianand, R. +3 more
We present a detailed analysis of a H2-bearing metal-rich sub-damped Lyman α system at zabs = 0.10115 towards the radio-loud quasar J0441-4313, at a projected separation of ∼7.6 kpc from a star-forming galaxy. The H2, {C I}} and {Na I} absorption are much stronger in the redder of the two components seen in the Hub…
Long-term XMM-Newton investigation of two particle-accelerating colliding-wind binaries in NGC 6604: HD 168112 and HD 167971
De Becker, M.
The long-term (over more than one decade) X-ray emission from two massive stellar systems known to be particle accelerators is investigated using XMM-Newton. Their X-ray properties are interpreted taking into account recent information about their multiplicity and orbital parameters. The two targets, HD 168112 and HD 167971, appear to be overlumin…
Line-depth-ratio temperatures for the close binary ν Octantis: new evidence supporting the conjectured circumstellar retrograde planet
Ramm, D. J.
We explore the possibly that either star-spots or pulsations are the cause of a periodic radial velocity (RV) signal (P ∼ 400 d) from the K-giant binary ν Octantis (P ∼ 1050 d, e ∼ 0.25), alternatively conjectured to have a retrograde planet. Our study is based on temperatures derived from 22 line-depth ratios (LDRs) for ν Oct and 20 calibration s…
Corrugated velocity patterns in the spiral galaxies: NGC 278, NGC 1058, NGC 2500 & UGC 3574
Pérez, Enrique; Alfaro, Emilio J.; Sánchez-Gil, M. Carmen
We address the study of the H α vertical velocity field in a sample of four nearly face-on galaxies using long-slit spectroscopy taken with the Intermediate dispersion Spectrograph and Imaging System (ISIS), attached to the William Herschel Telescope (WHT) at the Roque de los Muchachos Observatory (Spain). The spatial structure of the velocity ver…
Modelling of the surface emission of the low magnetic field magnetar SGR 0418+5729
Rea, N.; Perna, R.; Guillot, S. +2 more
We perform a detailed modelling of the post-outburst surface emission of the low magnetic field magnetar SGR 0418+5729. The dipolar magnetic field of this source, B=6 {× 10^{12}}{ G} estimated from its spin-down rate, is in the observed range of magnetic fields for normal pulsars. The source is further characterized by a high pulse fraction and a …
The velocity distribution in the solar neighbourhood from the LAMOST pilot survey
Zhang, Yong; Xu, Yan; Mao, Shude +5 more
We use about 15 000 F/G nearby dwarf stars selected from the LAMOST pilot survey to map the U-V velocity distribution in the solar neighbourhood. An extreme deconvolution algorithm is applied to reconstruct an empirical multi-Gaussian model. In addition to the well-known substructures, e.g. Sirius, Coma Berenices, Hyades-Pleiades overdensities, se…