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A high-resolution H I study towards the supernova remnant Puppis A and its environments
Reynoso, E. M.; Cichowolski, S.; Walsh, A. J.
We observed the supernova remnant Puppis A in the 21 cm line with the Australia Telescope Compact Array with the aim of determining the systemic velocity and, hence, the corresponding kinematic distance. For the compact, background sources in the field, we obtain absorption spectra by applying two methods: (a) subtracting profiles on- and off-sour…
Small Jupiter Trojans Survey with the Subaru/Hyper Suprime-Cam
Terai, Tsuyoshi; Yoshida, Fumi
We observed the L4 Jupiter Trojans (JTs) swarm using the Hyper Suprime-Cam attached to the 8.2 m Subaru Telescope on 2015 March 30 (UT). The survey covered ∼26 deg2 of sky area near the opposition and around the ecliptic plane with a 240 s exposure time in the r-band filter through the entire survey. We detected 631 L4 JTs in the survey…
The detection of variable radio emission from the fast rotating magnetic hot B-star HR\xA07355 and evidence for its X-ray aurorae
Umana, G.; Leone, F.; Ignace, R. +6 more
In this paper, we investigate the multiwavelength properties of the magnetic early B-type star HR 7355. We present its radio light curves at several frequencies, taken with the Jansky Very Large Array, and X-ray spectra, taken with the XMM-Newton X-ray telescope. Modelling of the radio light curves for the Stokes I and V provides a quantitative an…
Photospheric activity of the Sun with VIRGO and GOLF. Comparison with standard activity proxies
García, R. A.; Pallé, P. L.; Bertello, L. +3 more
We study the variability of solar activity using new photospheric proxies originally developed for the analysis of stellar magnetism with the CoRoT and Kepler photometric observations. These proxies were obtained by tracking the temporal modulations in the observations associated with the spots and magnetic features as the Sun rotates. We analyzed…
Gaia Data Release 1. Cross-match with external catalogues. Algorithm and results
Marinoni, S.; Marrese, P. M.; Fabrizio, M. +1 more
Context. Although the Gaia catalogue on its own will be a very powerful tool, it is the combination of this highly accurate archive with other archives that will truly open up amazing possibilities for astronomical research. The advanced interoperation of archives is based on cross-matching, leaving the user with the feeling of working with one si…
Determining the torus covering factors for a sample of type 1 AGN in the local Universe
Done, Chris; Gandhi, Poshak; Dewangan, Gulab C. +4 more
In the unified scheme of active galactic nuclei, a dusty torus absorbs and then reprocesses a fraction of the intrinsic luminosity which is emitted at longer wavelengths. Thus, subject to radiative transfer corrections, the fraction of the sky covered by the torus as seen from the central source (known as the covering factor fc) can be …
Galactoseismology and the local density of dark matter
Widrow, Lawrence M.; Banik, Nilanjan; Dodelson, Scott
We model vertical breathing mode perturbations in the Milky Way's stellar disc and study their effects on estimates of the local dark matter density, surface density, and vertical force. Evidence for these perturbations, which involve compression and expansion of the Galactic disc perpendicular to the mid-plane, comes from three different surveys …
Polarization due to rotational distortion in the bright star Regulus
Bailey, Jeremy; Cotton, Daniel V.; Howarth, Ian D. +4 more
Polarization in stars was first predicted by Chandrasekhar1, who calculated a substantial linear polarization at the stellar limb for a pure electron-scattering atmosphere. This polarization will average to zero when integrated over a spherical star but could be detected if the symmetry was broken, for example, by the eclipse of a binar…
X-ray constraints on the fraction of obscured active galactic nuclei at high accretion luminosities
Georgakakis, A.; Salvato, M.; Liu, Z. +9 more
The wide-area XMM-XXL X-ray survey is used to explore the fraction of obscured active galactic nuclei (AGNs) at high accretion luminosities, LX(2-10 keV) ≳ 1044 erg s - 1, and out to redshift z ≈ 1.5. The sample covers an area of about 14 deg2 and provides constraints on the space density of powerful AGN…
Red but not dead: unveiling the star-forming far-infrared spectral energy distribution of SpARCS brightest cluster galaxies at 0 < z < 1.8
Lidman, C.; Surace, J.; Muzzin, A. +8 more
We present the results of a Spitzer/Herschel infrared photometric analysis of the largest (716) and the highest-redshift (z = 1.8) sample of brightest cluster galaxies (BCGs), those from the Spitzer Adaptation of the Red-Sequence Cluster Survey Given the tension that exists between model predictions and recent observations of BCGs at z < 2, we …