Search Publications
Relationship Between the Magnetic Flux of Solar Eruptions and the Ap Index of Geomagnetic Storms
Grechnev, V. V.; Chertok, I. M.; Belov, A. V. +2 more
Solar coronal mass ejections (CMEs) are the main drivers of the most powerful non-recurrent geomagnetic storms. In the extreme-ultraviolet range, CMEs are accompanied by bright post-eruption arcades and dark dimmings. The analysis of events of Solar Cycle 23 (Chertok et al. in Solar Phys.282, 175, 2013) revealed that the summarized unsigned magnet…
Constraints on Ωm and σ8 from the potential-based cluster temperature function
Bartelmann, Matthias; Angrick, Christian; Pace, Francesco +1 more
The abundance of galaxy clusters is in principle a powerful tool to constrain cosmological parameters, especially Ωm and σ8, due to the exponential dependence in the high-mass regime. While the best observables are the X-ray temperature and luminosity, the abundance of galaxy clusters, however, is conventionally predicted as …
Suzaku observation of supernova remnant G332.5-5.6
Zhu, H.; Tian, W. W.; Wu, D.
We analyse the Suzaku X-ray Imaging Spectrometer data of the central region of supernova remnant G332.5-5.6. The X-ray data are well described by a single non-equilibrium ionization thermal model, <monospace>vnei</monospace>, with an absorbing hydrogen column density of 1.4^{+0.4}_{-0.1} × 1021 cm-2. The plasma is…
Case study of small scale polytropic index in the central plasma sheet
Cao, JinBin; Wang, Jing; Yang, JunYing +8 more
This paper studies the effective polytropic index in the central plasma sheet (CPS) by using the method of Kartalev et al. (2006), which adopts the denoising technique of Haar wavelet to identify the homogeneous MHD Bernoulli integral (MBI) and has been frequently used to study the polytropic relation in the solar wind. We chose the quiet CPS cros…
Bayesian evidence of nonstandard inflation: Isocurvature perturbations and running spectral index
Komatsu, Eiichiro; Giannantonio, Tommaso
Bayesian model comparison penalizes models with more free parameters that are allowed to vary over a wide range, and thus offers the most robust method to decide whether some given data require new parameters. In this paper, we ask a simple question: do current cosmological data require extensions of the simplest single-field inflation models? Spe…
Influence of Planck foreground masks in the large angular scale quadrant CMB asymmetry
Cabella, P.; Santos, L.; Villela, T. +1 more
Context. The measured cosmic microwave background (CMB) angular distribution shows high consistency with the ΛCDM model, which predicts cosmological isotropy as one of its fundamental characteristics. However, isotropy violations were reported in CMB temperature maps of the Wilkinson Microwave Anisotropy Probe (WMAP) and confirmed by Planck satell…
Evolutionary status of the active star PZ Mon
Semenko, E. A.; Bondar', N. I.; Gorynya, N. A. +2 more
We use original spectra and available photometric data to recover the parameters of the stellar atmosphere of PZ Mon, formerly referred to as an active red dwarf. The derived effective temperature Teff = 4700 K and gravity log g = 2.8 suggest that PZ Mon is a K2III giant. Stellar atmosphere parameters (Teff and log g), along …
RCS2 J232727.6-020437: An Efficient Cosmic Telescope at z=0.6986
Sharon, K.; Schrabback, T.; Hoag, A. +13 more
We present a detailed gravitational lens model of the galaxy cluster RCS2 J232727.6-020437. Due to cosmological dimming of cluster members and intra-cluster light, its high redshift (z = 0.6986) makes it ideal for studying high-redshift background galaxies. Using new Advanced Camera for Surveys and WFC3/IR Hubble Space Telescope data, we identify …
Rethinking a Mysterious Molecular Cloud
Imara, N.
I present high-resolution column density maps of two molecular clouds (MCs) having strikingly different star formation rates. To better understand the unusual, massive G216-2.5, an MC with no massive star formation, the distribution of its molecular gas is compared to that of the Rosette MC. Far-infrared data from Herschel are used to derive N(H
Updated 24 µm Period-Luminosity Relation Derived from Galactic Cepheids
Ngeow, Chow-Choong; Kanbur, Shashi M.; Bhardwaj, Anupam +2 more
In this work, we updated the catalog of Galactic Cepheids with 24 µm photometry by cross-matching the positions of known Galactic Cepheids to the recently released MIPSGAL point source catalog. We have added 36 new sources featuring MIPSGAL photometry in our analysis, thus increasing the existing sample to 65. Six different sources of compil…