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On the accretion process in a high-mass star forming region. A multitransitional THz Herschel-HIFI study of ammonia toward G34.26+0.15
Menten, K. M.; Persson, C. M.; Olberg, M. +8 more
Aims: Our aim is to explore the gas dynamics and the accretion process in the early phase of high-mass star formation.
Methods: The inward motion of molecular gas in the massive star forming region G34.26+0.15 is investigated by using high-resolution profiles of seven transitions of ammonia at THz frequencies observed with Herschel-HIFI.…
The Fate of a Red Nugget: In Situ Star Formation of Satellites around a Massive Compact Galaxy
Morishita, Takahiro; Ichikawa, Takashi
To study the accretion phase for local massive galaxies, we search accreting satellites around a massive compact galaxy ({M}*∼ 3.9× {10}10{M}⊙ ), spectroscopically confirmed ({z}{{spec}}=1.9213) in the eXtreme Deep Field, which has been originally reported in Szomoru et al. We detect 1369 satellite candi…
Coronal Magnetic Fields Derived from Simultaneous Microwave and EUV Observations and Comparison with the Potential Field Model
Shibasaki, Kiyoto; Shiota, Daikou; Nozawa, Satoshi +2 more
We estimated the accuracy of coronal magnetic fields derived from radio observations by comparing them to potential field calculations and the differential emission measure measurements using EUV observations. We derived line-of-sight components of the coronal magnetic field from polarization observations of the thermal bremsstrahlung in the NOAA …
A New Challenge to Solar Dynamo Models from Helioseismic Observations: The Latitudinal Dependence of the Progression of the Solar Cycle
Hill, F.; Jain, K.; Tripathy, S. C. +1 more
The onset of the solar cycle at mid-latitudes, the slowdown in the drift of sunspots toward the equator, the tail-like attachment, and the overlap of successive cycles at the time of minimum activity are delicate issues in models of the αΩ dynamo wave and the flux transport dynamo. Very different parameter values produce similar results, making it…
The 2015 outburst of the accreting millisecond pulsar IGR J17511-3057 as seen by INTEGRAL, Swift, and XMM-Newton
Torres, D. F.; Romano, P.; Ferrigno, C. +5 more
We report on INTEGRAL, Swift, and XMM-Newton observations of IGR J17511-3057 performed during the outburst that occurred between March 23 and April 25, 2015. The source reached a peak flux of 0.7(2) × 10-9 erg cm-2 s-1 and decayed to quiescence in approximately a month. The X-ray spectrum was dominated by a power l…
Asteroid (21) Lutetia: Disk-resolved photometric analysis of Baetica region
Sierks, H.; Barucci, M. A.; Fornasier, S. +4 more
(21) Lutetia has been visited by Rosetta mission on July 2010 and observed with a phase angle ranging from 0.15° to 156.8°. The Baetica region, located at the north pole has been extensively observed by OSIRIS cameras system. Baetica encompass a region called North Pole Crater Cluster (NPCC), shows a cluster of superposed craters which presents si…
Planck's Dusty GEMS. II. Extended [CII] emission and absorption in the Garnet at z = 3.4 seen with ALMA
Kneissl, R.; Le Floc'h, E.; Falgarone, E. +9 more
We present spatially resolved ALMA [CII] observations of the bright (flux density S350 = 400 mJy at 350 µm), gravitationally lensed, starburst galaxy PLCK G045.1+61.1 at z = 3.427, the "Garnet". This source is part of our set of "Planck's Dusty GEMS", discovered with the Planck's all-sky survey. Two emission-line clouds with a rel…
X-ray and optical spectroscopy of the massive young open cluster IC 1805
Nazé, Y.; Rauw, G.
Context. Very young open clusters are ideal places to study the X-ray properties of a homogeneous population of early-type stars. In this respect, the IC 1805 open cluster is very interesting as it hosts the O4 If+ star HD 15570 thought to be in an evolutionary stage intermediate between a normal O-star and a Wolf-Rayet star.
Aims:…
Triangulum galaxy viewed by Planck
Chemin, L.; Nucita, A. A.; De Paolis, F. +9 more
We used Planck data to study the M 33 galaxy and find a substantial temperature asymmetry with respect to its minor axis projected onto the sky plane. This temperature asymmetry correlates well with the HI velocity field at 21 cm, at least within a galactocentric distance of 0.5°, and it is found to extend up to about 3° from the galaxy center. We…
Prediction of shock arrival times from CME and flare data
Nieves-Chinchilla, Teresa; Pulkkinen, Antti; Núñez, Marlon
This paper presents the Shock Arrival Model (SARM) for predicting shock arrival times for distances from 0.72 AU to 8.7 AU by using coronal mass ejections (CME) and flare data. SARM is an aerodynamic drag model described by a differential equation that has been calibrated with a data set of 120 shocks observed from 1997 to 2010 by minimizing the m…