Search Publications
A Statistical Study of Coronal Active Events in the North Polar Region
Shimojo, Masumi; Watanabe, Tetsuya; Sako, Nobuharu +1 more
In order to study the relationship between characteristics of polar coronal active events and the magnetic environment in which such events take place, we analyze 526 X-ray jets and 1256 transient brightenings in the polar regions and in regions around the equatorial limbs. We calculate the occurrence rates of these polar coronal active events as …
Galaxy Halo Truncation and Giant Arc Surface Brightness Reconstruction in the Cluster MACSJ1206.2-0847
Donahue, Megan; Broadhurst, Tom; Zheng, Wei +32 more
In this work, we analyze the mass distribution of MACSJ1206.2-0847, particularly focusing on the halo properties of its cluster members. The cluster appears relaxed in its X-ray emission, but has a significant amount of intracluster light that is not centrally concentrated, suggesting that galaxy-scale interactions are still ongoing despite the ov…
Extreme densities in Titan's ionosphere during the T85 magnetosheath encounter
Dougherty, M. K.; Roussos, E.; Garnier, P. +10 more
We present Cassini Langmuir probe measurements of the highest electron number densities ever reported from the ionosphere of Titan. The measured density reached 4310 cm-3 during the T85 Titan flyby. This is at least 500 cm-3 higher than ever observed before and at least 50% above the average density for similar solar zenith a…
A study of the starless dark cloud LDN 1570: Distance, dust properties, and magnetic field geometry
Maheswar, G.; Bhatt, H. C.; Ramaprakash, A. N. +3 more
Aims: We aim to map the magnetic field geometry and to study the dust properties of the starless cloud, L1570, using multi-wavelength optical polarimetry and photometry of the stars projected on the cloud.
Methods: The direction of the magnetic field component parallel to the plane of the sky of a cloud can be obtained using polarimetry …
A Deep Search for Molecular Gas in Two Massive Lyman Break Galaxies at z = 3 and 4: Vanishing CO-emission Due to Low Metallicity?
Daddi, E.; Elbaz, D.; Morrison, G. +14 more
We present deep IRAM Plateau de Bure Interferometer observations, searching for CO-emission toward two massive, non-lensed Lyman break galaxies at z = 3.216 and 4.058. With one low significance CO detection (3.5σ) and one sensitive upper limit, we find that the CO lines are gsim3-4 times weaker than expected based on the relation between IR and CO…
Uncovering the Deeply Embedded Active Galactic Nucleus Activity in the Nuclear Regions of the Interacting Galaxy Arp 299
Alvarez, C.; Esquej, P.; Colina, L. +14 more
We present mid-infrared (MIR) 8-13 µm spectroscopy of the nuclear regions of the interacting galaxy Arp 299 (IC 694+NGC 3690) obtained with CanariCam (CC) on the 10.4 m Gran Telescopio Canarias (GTC). The high angular resolution (~0.''3-0.''6) of the data allows us to probe nuclear physical scales between 60 and 120 pc, which is a factor of …
X-ray emission from the luminous O-type subdwarf HD 49798 and its compact companion
Tiengo, A.; Mereghetti, S.; Stella, L. +4 more
The X-ray source RX J0648.0-4418 is the only confirmed binary system in which a compact object, most likely a massive white dwarf, accretes from a hot subdwarf companion, the bright sdO star HD 49798. The X-ray emission from this system is characterized by two periodic modulations caused by an eclipse, at the orbital period of 1.55 d, and by the r…
New Constraints on the Early Expansion History of the Universe
Hojjati, Alireza; Samsing, Johan; Linder, Eric V.
Cosmic microwave background measurements have pushed to higher resolution, lower noise, and more sky coverage. These data enable a unique test of the early Universe’s expansion rate and constituents such as effective number of relativistic degrees of freedom and dark energy. Using the most recent data from Planck and WMAP9, we constrain the expans…
Mineralogy of Mare Serenitatis on the near side of the Moon based on Chandrayaan-1 Moon Mineralogy Mapper (M3) observations
Bhattacharya, Satadru; Chauhan, Prakash; Kiran Kumar, A. S. +2 more
Spectral analysis of Mare Serenitatis has been carried out using Chandrayaan-1 Moon Mineralogy Mapper (M3) data in order to map the compositional diversity of the basaltic units that exist in the basin. Mare Serenitatis is characterized by multiple basaltic flows of different ages indicating a prolonged volcanism subsequent to the basin…
Far-infrared spectroscopy of a lensed starburst: a blind redshift from {\it herschel}.
Valtchanov, I.; Ivison, R. J.; Clements, D. L. +20 more
We report the redshift of HATLAS J132427.0+284452 (hereafter HATLAS J132427), a gravitationally lensed starburst galaxy, the first determined `blind' by the Herschel Space Observatory. This is achieved via the detection of [C II] consistent with z = 1.68 in a far-infrared spectrum taken with the SPIRE Fourier Transform Spectrometer (FTS). We demon…