Search Publications
New database for a sample of optically bright lensed quasars in the northern hemisphere
Gil-Merino, R.; Goicoechea, L. J.; Oscoz, A. +1 more
In the framework of the Gravitational LENses and DArk MAtter (GLENDAMA) project, we present a database of nine gravitationally lensed quasars (GLQs) that have two or four images brighter than r = 20 mag and are located in the northern hemisphere. This new database consists of a rich variety of follow-up observations included in the GLENDAMA global…
Ultraviolet stellar population of the old open cluster M67 (NGC 2682)
Subramaniam, Annapurni; Sindhu, N.; Radha, C. Anu
We present the results of ultraviolet (UV) photometry of the old open cluster M67 obtained using Galaxy Evolution Explorer in far-ultraviolet (FUV) and near-ultraviolet (NUV) bands. UV detections of 18 blue straggler stars (BSSs), 3 white dwarfs (WDs), 4 yellow straggler stars, 2 sub-subgiants, and 25 X-ray sources are presented (along with an onl…
Resolved Star Formation Efficiency in the Antennae Galaxies
Leroy, Adam K.; Whitmore, Bradley C.; Johnson, Kelsey E. +3 more
We use Atacama Large Millimeter Array CO(3-2) observations in conjunction with optical observations from the Hubble Space Telescope to determine the ratio of stellar to gas mass for regions in the Antennae Galaxies. We adopt the term “instantaneous mass ratio” {IMR}(t)={M}stars}/({M}gas}+{M}stars}), which is equiva…
A bright-lensed galaxy at z = 5.4 with strong Ly α emission
Fan, Xiaohui; Jiang, Linhua; McGreer, Ian D. +10 more
We present a detailed study of an unusually bright, lensed galaxy at z = 5.424 discovered within the CFHTLS imaging survey. With an observed flux of iAB = 23.0, J141446.82+544631.9 is one of the brightest galaxies known at z > 5. It is characterized by strong Ly α emission, reaching a peak in (observed) flux density of >10-16…
Performance of the helium dewar and the cryocoolers of the Hitomi soft x-ray spectrometer
Tsujimoto, Masahiro; Eckart, Megan E.; Hoshino, Akio +35 more
The soft x-ray spectrometer (SXS) was a cryogenic high-resolution x-ray spectrometer onboard the Hitomi (ASTRO-H) satellite that achieved energy resolution of 5 eV at 6 keV, by operating the detector array at 50 mK using an adiabatic demagnetization refrigerator (ADR). The cooling chain from room temperature to the ADR heat sink was composed of tw…
K2-140b - an eccentric 6.57 d transiting hot Jupiter in Virgo
Bouchy, F.; Cochran, W. D.; Blanco-Cuaresma, S. +25 more
We present the discovery of K2-140b, a P = 6.57 d Jupiter-mass (MP = 1.019 ± 0.070MJup) planet transiting a V = 12.5 (G5-spectral type) star in an eccentric orbit (e = 0.120^{+0.056}_{-0.046}) detected using a combination of K2 photometry and ground-based observations. With a radius of 1.095 ± 0.018 RJup, the plane…
Fine Vertical Structures at the Cloud Heights of Venus Revealed by Radio Holographic Analysis of Venus Express and Akatsuki Radio Occultation Data
Tellmann, Silvia; Pätzold, Martin; Imamura, Takeshi +10 more
Radio occultation (RO) is one of the most efficient techniques for studying fine vertical structures in planetary atmospheres. However, the geometrical optics (GO) method, which has been used for the analysis of RO data, suffers blurring by the finite width (Fresnel scale) of the radio ray and cannot decipher multipath propagation, which also prev…
Predicting the COSIE-C Signal from the Outer Corona up to 3 Solar Radii
Telloni, Daniele; Andretta, Vincenzo; Del Zanna, Giulio +2 more
We present estimates of the signal to be expected in quiescent solar conditions, as would be obtained with the COronal Spectrographic Imager in the EUV in its coronagraphic mode (COSIE-C). COSIE-C has been proposed to routinely observe the relatively unexplored outer corona, where we know that many fundamental processes affecting both the lower co…
Spectroscopic Orbits of Subsystems in Multiple Stars. III.
Tokovinin, Andrei
Spectroscopic orbits are computed for inner pairs in six nearby hierarchical multiple systems (HIP 35733, 95106/95110, 105441, 105585/105569, 105947, and 109951). Radial velocities and resolved measurements, when available, are used to derive combined sets of outer orbital elements for three systems. Each multiple system is discussed individually.…
Debris discs with multiple absorption features in metallic lines: circumstellar or interstellar origin?
Eiroa, C.; Montesinos, B.; Bayo, A. +8 more
Debris discs are second-generation dusty discs thought to be devoid of gas. However, this idea has been challenged in the last years by gas detections in some systems. We compiled a database of 301 debris discs and collected high-resolution optical spectra for ∼77 per cent of them. From the analysis of these data we identified a group of 23 debris…