Search Publications
Timeline analysis and wavelet multiscale analysis of the AKARI All-Sky Survey at 90µm
Goto, Tomotsugu; Nakagawa, Takao; Shirahata, Mai +17 more
We present a careful analysis of the point-source detection limit of the AKARI All-Sky Survey in the WIDE-S 90-µm band near the North Ecliptic Pole (NEP). Timeline analysis is used to detect IRAS (Infrared Astronomy Satellite) sources and then a conversion factor is derived to transform the peak timeline signal to the interpolated 90-µ…
Iterative inversion of global magnetospheric information from energy neutral atom (ENA) images recorded by the TC-2/NUADU instrument
Barabash, S.; Shen, Chao; Cao, JinBin +5 more
A method is presented for retrieving the magnetospheric ion distribution from Energetic Neutral Atom (ENA) measurements made by the NUADU instrument on the TC-2 spacecraft. Based on the already well-established method of constrained linear inversion, an iterance technique suitable for the low count ENA measurements has been developed which is tole…
Coordinated Cluster and Double Star observations of the dayside magnetosheath and magnetopause at different latitudes near noon
Escoubet, C. P.; Pitout, F.; Dandouras, I. +5 more
We present results of a favorable conjunction where the equatorial spacecraft (TC-1) of the Double Star mission exits the dayside magnetopause near the equator, while Cluster is inbound, near the southern cusp. This configuration makes it possible to compare observations of the magnetopause, around the same magnetic local time but at different lat…
Modeling of C IV pumped fluorescence of Fe II in symbiotic stars
Nilsson, H.; Long, K. S.; Eriksson, M. +1 more
Aims:We describe how the C IV λ1548.18 line pumps the 1548.20 and 1548.41 Å channels of Fe II in symbiotic stars through the process known as photo-ionization by accidental resonance (PAR). We describe where and why Fe II fluorescence arises in symbiotic stars and whether the Fe II λ1548.41 channel can only be activated when there is a white-dwarf…
Geometry of Broad Line Regions of Active Galactic Nuclei
Lü, Xiao-Rong
It has long remained an open question as to the geometry of the broad line region (BLR) in active galactic nuclei (AGNs). The reverberation mapping technique which measures the response of the broad emission lines to the ionizing continuum, when combined with multiwavelength continuum fitted by sophisticated accretion disks, provides a way of prob…
Toward an unbiased sample of X-ray selected normal galaxies outside the local Universe
Georgakakis, A.
This paper shows that our understanding of the statistical properties of X-ray selected normal galaxies (e.g. X-ray luminosity function) can be significantly improved by combining a wide-area XMM-Newton survey with the moderare resolution and high S/N optical spectroscopy of the SDSS. Such a combined dataset has the potential to minimise uncertain…
Investigation of CME dynamics in the LASCO field of view
Cho, K. -S.; Moon, Y. -J.; Shanmugaraju, A. +2 more
Context: The speed-distance profile of CMEs is important for understanding the propagation of CMEs.
Aims: Our main aim is to study the initial speed of CMEs in the LASCO field of view and its role in subsequent CME propagation using the acceleration-speed profile. The secondary aim is to obtain the speed growth rate.
Methods: We considered…
Deep surface photometry of edge-on spirals in Abell galaxy clusters. Constraining environmental effects
Santiago, B. X.; Vale, T. B.
Context: There is a clear scarcity of structural parameters for stellar thick discs, especially for spiral galaxies located in high-density regions, such as galaxy clusters and compact groups.
Aims: We have modelled the thin and thick discs of 4 edge-on spirals located in Abell clusters: NGC 705, ESO 243G49, ESO 187G19, LCSBS 0496P. Deep I ban…
Hubble Space Telescope Imaging of Bright Lyman Break Galaxy Candidates from the Sloan Digital Sky Survey: not Lbgs after all
Pogge, Richard W.; Bentz, Misty C.; Osmer, Patrick S.
We present deep Hubble Space Telescope ACS and NICMOS images of six bright Lyman break galaxy candidates that were previously discovered in the Sloan Digital Sky Survey. We find that five of the objects are consistent with unresolved point sources. Although somewhat atypical of the class, they are most likely LoBAL quasars, perhaps FeLoBALs. The s…
Diffracto-Astrometry with Hubble Space Telescope and Adaptive Optics Images
Sánchez, L. J.; Ruelas-Mayorga, A.; Allen, C. +1 more
Following the lead established by Allen et al. (1974, 2004) in the study of internal movements in Trapezium-type systems, we decided to investigate the possibility of performing precision astrometry on Hubble Space Telescope (HST) images and on images obtained with Adaptive Optics (AO) systems. A region widely observed by the HST is that of the Or…