Search Publications
Northern Galactic molecular cloud clumps in Hi-GAL: dense gas map and environmental trends
Rosolowsky, Erik; Zetterlund, Erika; Glenn, Jason
In the quest to understand high-mass star formation, it is necessary to understand that from which the high-mass stars will form - dense molecular gas clouds and clumps. The Herschel Infrared Galactic Plane Survey (Hi-GAL) is a comprehensive survey of thermal dust emission that can be used to characterize the properties and Galactic distribution o…
Is there really a debris disc around ζ2 Reticuli?
Hales, A.; Casassus, S.; Bayo, A. +10 more
The presence of a debris disc around the Gyr-old solar-type star ζ ^2 Reticuli was suggested by the Spitzer infrared excess detection. Follow-up observations with Herschel/PACS revealed a double-lobed feature that displayed asymmetries both in brightness and position. Therefore, the disc was thought to be edge-on and significantly eccentric. Here …
The First Glitch in a Central Compact Object Pulsar: 1E 1207.4-5209
Gotthelf, E. V.; Halpern, J. P.
Since its discovery as a pulsar in 2000, the central compact object (CCO) 1E 1207.4-5209 in the supernova remnant PKS 1209-51/52 had been a stable 0.424 s rotator with an extremely small spin-down rate and weak ({B}s≈ 9× {10}10 G) surface dipole magnetic field. In 2016 we observed a glitch from 1E 1207.4-5209 of at least {{Δ …
CCD Measurements of Double and Multiple Stars at ASV and NAO Rozhen in 2016: Four Linear Solutions
Cvetković, Zorica; Pavlović, Rade; Boeva, Svetlana
The results of classical CCD observations for 371 double or multiple stars (450 pairs) obtained at both, Serbian Astronomical Station on the mountain of Vidojevica (ASV) and Bulgarian National Astronomical Observatory at Rozhen (NAOR) are presented. At ASV the observations were performed with the 0.6 m telescope in the first half of 2016 during 11…
Temperature gradient in the solar photosphere. Test of a new spectroscopic method and study of its feasibility for ground-based telescopes
Chiavassa, A.; Faurobert, M.; Carbillet, M. +2 more
Context. The contribution of quiet-Sun regions to the solar irradiance variability is currently unclear. Some solar-cycle variations of the quiet-Sun physical structure, such as the temperature gradient, might affect the irradiance. The synoptic measurement of this quantity along the activity cycle would improve our understanding of long-term irra…
The first detection of neutral hydrogen in emission in a strong spiral lens
Heiles, Carl; Blandford, Roger; Chakrabarti, Sukanya +7 more
We report H I observations of eight spiral galaxies that are strongly lensing background sources. Our targets were selected from the Sloan WFC (Wide Field Camera) Edge-on Late-type Lens Survey (SWELLS) using the Arecibo, Karl G. Jansky Very Large Array, and Green Bank telescopes. We securely detect J1703+2451 at z = 0.063 with a signal-to-noise ra…
Searching Ultra-compact Pulsar Binaries with Abnormal Timing Behavior
Gong, B. P.; Li, Y. P.; Yuan, J. P. +8 more
Ultra-compact pulsar binaries are both ideal sources of gravitational radiation for gravitational wave detectors and laboratories for fundamental physics. However, the shortest orbital period of all radio pulsar binaries is currently 1.6 hr. The absence of pulsar binaries with a shorter orbital period is most likely due to technique limit. This pa…
SAFARI - I. A SPHERE discovery of a super metal-rich M-dwarf companion to the star HD 86006
Jones, M. I.; Girard, J. H.; Vigan, A. +3 more
We report the direct detection of a fully convective, early-to-mid M-dwarf companion orbiting the star HD 86006, using ESO-SPHERE during Science Verification as part of the SAFARI program. HARPS+CORALIE radial velocity measurements first indicated a possible companion. Such work highlights the synergies that are now possible between these two obse…
Current sheet bending as destabilizing factor in magnetotail dynamics
Korovinskiy, D. B.; Semenov, V. S.; Erkaev, N. V. +2 more
The problem of the magnetohydrodynamical stability of bent magnetotail current sheets is considered by means of 2.5-dimensional numerical simulations. This study is focused on the cross-tail transversal mode, modeling the magnetotail flapping motions, at the background of the Kan-like magnetoplasma equilibrium. It is found that in symmetrical curr…
Spectral analysis of IGR J01572-7259 during its 2016 outburst
Tiengo, A.; Mereghetti, S.; Sidoli, L. +3 more
We report on the results of the XMM-Newton observation of IGR J01572-7259 during its most recent outburst in 2016 May, the first since 2008. The source reached a flux f ∼ 10-10 erg cm-2 s-1, which allowed us to perform a detailed analysis of its timing and spectral properties. We obtained a pulse period Pspin<…