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Cold, dense clouds of gas have been proposed as baryonic candidates for the dark matter in Galactic haloes, and have also been invoked in the Galactic disc as an explanation for the excess faint sub-mm sources detected by SCUBA. Even if…

天体物理学 · 物理学 2009-11-07 E. Kerins , J. Binney , J. Silk

It is assumed that heavy dark matter $\phi$ with O(TeV) mass captured by the Earth may decay to relativistic light milli-charged particles (MCPs). These MCPs could be measured by the IceCube neutrino telescope. The massless hidden photon…

高能天体物理现象 · 物理学 2024-05-02 Ye Xu

Cold interstellar gas clouds provide an exciting new method to discover dark matter. Their immense size makes them uniquely sensitive to interactions from the heaviest, most rarefied dark matter models. Using gas cloud observations, we…

高能物理 - 唯象学 · 物理学 2021-07-07 Amit Bhoonah , Joseph Bramante , Sarah Schon , Ningqiang Song

We investigate the possibility of determining whether microlensing objects towards the Large Magellanic Cloud (LMC) are in a Galactic thick disc, or are in a Galactic halo, by using parallax measurements with an Earth-radius scale baseline.…

天体物理学 · 物理学 2009-11-07 T. Sumi , Y. Kan-ya

Clouds form in the atmospheres of planets where they can determine the observable spectra, the albedo and phase curves. Cloud properties are determined by the local thermodynamical and chemical conditions of an atmospheric gas. A retrieval…

地球与行星天体物理 · 物理学 2017-09-20 G. Mahapatra , Ch. Helling , Y. Miguel

The James Webb Space Telescope (JWST) will provide an opportunity to investigate the atmospheres of potentially habitable planets. Aerosols, significantly mute molecular features in transit spectra because they prevent light from probing…

地球与行星天体物理 · 物理学 2022-07-28 Dhvani Doshi , Nicolas B. Cowan , Yi Huang

Observation of clustering of ultra-high energy cosmic rays (UHECR) suggests that they are emitted by compact sources. Assuming small deflection of UHECR during the propagation, the statistical analysis of clustering allows to estimate the…

天体物理学 · 物理学 2010-12-03 S. L. Dubovsky , P. G. Tinyakov , I. I. Tkachev

In this work we explore the possibility that the formation of Quark Gluon Plasma (QGP) during the first interactions of Ultra High Energy Cosmic Rays (UHECRs) may result in observable signatures in ground profile and shower particle…

高能天体物理现象 · 物理学 2018-11-14 Danielle LaHurd , Corbin E. Covault

The clustering of ultra high energy (above 10^20 eV) cosmic rays (UHECR) suggests that they might be emitted by compact sources. Statistical analysis of Dubovsky et al. (Phys. Rev. Lett. 85 (2000) 1154) estimated the source density. We…

高能物理 - 唯象学 · 物理学 2009-12-31 Z. Fodor , S. D. Katz

Nine HII regions of the LMC were mapped in 13CO(1--0) and three in 12CO(1--0) to study the physical properties of the interstellar medium in the Magellanic Clouds. For N113 the molecular core is found to have a peak position which differs…

天体物理学 · 物理学 2007-05-23 Y. -N. Chin , C. Henkel , J. B. Whiteoak , T. J. Millar , M. R. Hunt , C. Lemme

Different types of core-collapse supernovae (SNe) have been considered as candidate sources of high-energy cosmic neutrinos. Stripped-envelope SNe, including energetic events like hypernovae and super-luminous SNe, are of particular…

高能物理 - 唯象学 · 物理学 2018-12-11 Arman Esmaili , Kohta Murase

Using data from the Southern Galactic Plane Survey (SGPS) we analyze an HI self-absorption cloud centered on l = 318.0 deg, b = -0.5 deg, and velocity, v = -1.1 km/s. The cloud was observed with the Australia Telescope Compact Array (ATCA)…

天体物理学 · 物理学 2009-11-10 D. W. Kavars , J. M. Dickey , N. M. McClure-Griffiths , B. M. Gaensler , A. J. Green

Measurements by dust detectors on interplanetary spacecraft appear to indicate a substantial flux of interstellar particles with masses exceeding 10^{-12}gram. The reported abundance of these massive grains cannot be typical of interstellar…

天体物理学 · 物理学 2009-11-13 B. T. Draine

We report new observations of the fundamental $J=1-0$ transition of HCl (at 625.918GHz) toward a sample of 25 galactic star-forming regions, molecular clouds, and evolved stars, carried out using the Caltech Submillimeter Observatory.…

The geographic South Pole provides unique opportunities to study cosmic particles in the Southern Hemisphere. It represents an optimal location to deploy large-scale neutrino telescopes in the deep Antarctic ice, such as AMANDA or IceCube.…

高能天体物理现象 · 物理学 2024-05-21 D. Soldin , P. A. Evenson , H. Kolanoski , A. A. Watson

Modern observatories of ultra-high energy cosmic rays (UHECR) have collected over 10^4 events with energies above 10 EeV, whose arrival directions appear to be nearly isotropically distributed. On the other hand, the distribution of matter…

高能天体物理现象 · 物理学 2019-01-07 Armando di Matteo , Peter Tinyakov

Many models of globular cluster formation assume the presence of cold dense clouds in early universe. Here we re-examine the Fall & Rees (1985) model for formation of proto-globular cluster clouds (PGCCs) via thermal instabilities in a…

天体物理学 · 物理学 2007-05-23 Hyesung Kang , George Lake , Dongsu Ryu

Complex CME/ICME structures in the solar wind often arising in the heliosphere as a result of interaction between two or more CMEs are very important due to their enhanced geoefficiency, but their modeling is difficult due to lack of…

太阳与恒星天体物理 · 物理学 2025-01-14 Denis Rodkin , Vladislav Lukmanov , Vladimir Slemzin , Igor Chashei

We present the results of targeted observations and a survey of 1612-, 1665-, and 1667-MHz circumstellar OH maser emission from asymptotic giant branch (AGB) stars and red supergiants (RSGs) in the Small Magellanic Cloud (SMC), using the…

Cosmic rays pervade the Galaxy and are thought to be accelerated in supernova shocks. The interaction of cosmic rays with dense interstellar matter has two important effects: 1) high energy (>1 GeV) protons produce {\gamma}-rays by…

星系天体物理 · 物理学 2015-05-30 C. Ceccarelli , P. Hily-Blant , T. Montmerle , G. Dubus , Y. Gallant , A. Fiasson