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Faint X-Ray Binaries and their Optical Counterparts in M31
Barmby, P.; Vulic, N.; Gallagher, S. C.
X-ray binaries (XRBs) are probes of both star formation and stellar mass, but more importantly remain one of the only direct tracers of the compact object population. To investigate the XRB population in M31, we utilized all 121 publicly available observations of M31 totalling over 1 Ms from Chandra's ACIS instrument. We studied 83 star clusters i…
On vortex motion in chromospheric network boundaries
Tavabi, E.
A large percent of spicules shows a surge-like behavior on the solar limb, supporting a multi-component model with twisted threads. The counterpart of limb spicules foot-points is investigated on the disk, and this re-examination indicates that the interpretation of transverse motion of off-limb spicules could directly be related to rotational mot…
Effect of plasma torus density variations on the morphology and brightness of the Io footprint
Crary, F.; Payan, A. P.; Rajendar, A. +1 more
We develop a 2-D-layered model of the Io plasma torus to study the apparent "shutoff" of the Io footprint in 2007, when it disappeared beneath a region of diffuse emissions, roughly coincident with a massive eruption of Tvashtar Paterae. First, we investigate the effects of Io's location in the plasma torus and validate our model results against H…
Spacecraft Doppler tracking with possible violations of LLI and LPI: preliminary bounds on LLI from Mars Express
Xie, Yi; Huang, Yong; Zhang, Yu-Fei +2 more
Three-way spacecraft Doppler tracking is currently widely used and it plays an important role in the control and navigation of deep space missions. Using the theory of three-way Doppler tracking, including possible violations of the local Lorentz invariance (LLI) and the local position invariance (LPI), we analyze the post-fit residuals of three-w…
Analytical model of rotating two-cell convection at Saturn
Waite, J. H.; Burch, J. L.; Hill, T. W. +1 more
We use an analytical model of magnetosphere-ionosphere coupling to show that an asymmetric ring current (RC) pressure with an m=1 longitudinal dependence can initiate a rotating two-cell interchange potential. The model extends prior similar work by considering both cold plasma interchange and warm plasma pressure. This model predicts that within …
Nonadiabatic acceleration of plasma sheet ions related to ion cyclotron waves
Dandouras, I.; Rème, H.; Cao, J. B. +2 more
The story of Seyfert galaxy RE J2248-511: from intriguingly ultrasoft to unremarkably average
Page, M. J.; Done, C.; Wiersema, K. +7 more
RE J2248-511 is one of only 14 non-blazar active galactic nuclei (AGN) detected in the far-ultraviolet (FUV) by the ROSAT Wide Field Camera implying a large ultrasoft X-ray flux. This soft X-ray excess is strongly variable on year time-scales, a common property of narrow-line Seyfert 1s, yet its optical line widths classify this source as a broad-…
PACS photometer calibration block analysis
Balog, Z.; Marton, G.; Müller, T. G. +3 more
The absolute stability of the PACS bolometer response over the entire mission lifetime without applying any corrections is about 0.5 % (standard deviation) or about 8 % peak-to-peak. This fantastic stability allows us to calibrate all scientific measurements by a fixed and time-independent response file, without using any information from the PACS…
The star formation history of redshift z ~ 2 galaxies: the role of the infrared prior
Nonino, Mario; Lapi, Andrea; De Zotti, Gianfranco +3 more
We build a sample of 298 spectroscopically-confirmed galaxies at redshift z ~ 2, selected in the z850-band from the GOODS-MUSIC catalog. By utilizing the rest frame 8 µm luminosity as a proxy of the star formation rate (SFR), we check the accuracy of the standard SED-fitting technique, finding it is not accurate enough to provide …
Spectra of faint sources in crowded fields with FRODOSpec on the Liverpool Robotic Telescope
Goicoechea, L. J.; Shalyapin, V. N.
We check the performance of the FRODOSpec integral-field spectrograph for observations of faint sources in crowded fields. Although the standard processing pipeline L2 yields too noisy fibre spectra, we present a new processing software (L2LENS) that gives rise to accurate spectra for the two images of the gravitationally lensed quasar Q0957+561. …