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The heliosphere serves as a probe of interstellar material (ISM) close to the Sun. Measurements of ISM inside and outside of the heliosphere show that we reside in typical warm partially ionized ISM that can be successfully modeled using…

Astrophysics · Physics 2007-05-23 P. C. Frisch

We present deep polarimetric observations at 154 MHz with the Murchison Widefield Array (MWA), covering 625 deg^2 centered on RA=0 h, Dec=-27 deg. The sensitivity available in our deep observations allows an in-band, frequency-dependent…

We study the clustering of matter in the intergalactic medium from the Lyman-alpha forests seen in the spectra of pairs or groups of z ~ 2 quasars observed with FORS2 and UVES at the VLT-UT2 Kueyen ESO telescope. The sample consists of five…

Astrophysics · Physics 2009-11-07 E. Rollinde , P. Petitjean , C. Pichon , S. Colombi , B. Aracil , V. D'Odorico , M. G. Haehnelt

HESS J1825-137 is a pulsar wind nebula (PWN) whose TeV emission extends across ~1 deg. Its large asymmetric shape indicates that its progenitor supernova interacted with a molecular cloud located in the north of the PWN as detected by…

High Energy Astrophysical Phenomena · Physics 2016-04-04 F. Voisin , G. Rowell , M. G. Burton , A. Walsh , Y. Fukui , F. Aharonian

We report new analyses of spectra of the $3.2-3.3~\mu$m absorption feature observed in the diffuse interstellar medium toward three Milky Way sources: 2MASS $J17470898-2829561$ (2M1747) and the Quintuplet Cluster, both located in the…

Astrophysics of Galaxies · Physics 2024-02-19 L. S. Bernstein , T. R. Geballe

We present an empirical dynamical model of the local interstellar medium based on 270 radial-velocity measurements for 157 sight lines toward nearby stars. Physical-parameter measurements (i.e., temperature, turbulent velocity, depletions)…

Astrophysics · Physics 2007-09-28 Seth Redfield , Jeffrey L. Linsky

We present FUSE observations of the interstellar gas toward 30 white dwarf and 1 subdwarf (SdO) stars. These sightlines probe the Local Bubble (LB) and the local interstellar medium (LISM) near the LB. Our survey detected only diffuse H_2…

Astrophysics · Physics 2008-11-26 N. Lehner , E. B. Jenkins , C. Gry , H. W. Moos , P. Chayer , S. Lacour

It is generally recognized that the interstellar medium has a vast range of densities and temperatures. While these two properties are usually anticorrelated with each other, there are nevertheless variations in their product, i.e., the…

Astrophysics · Physics 2007-05-23 Edward B. Jenkins , Todd M. Tripp

We have analyzed HCN(1-0) and CS(2-1) line profiles obtained with high signal-to-noise ratios toward distinct positions in three selected objects in order to search for small-scale structure in molecular cloud cores associated with regions…

Astrophysics of Galaxies · Physics 2011-08-31 L. E. Pirogov , I. I. Zinchenko

We present for the first time predictions for UV line emission of intergalactic and circumgalactic gas from Adaptive Mesh Resolution (AMR) Large Scale Structure (LSS) simulations at redshifts 0.3<z<1.2, with specific emphasis on…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 S. Frank , Y. Rasera , D. Vibert , B. Milliard , A. Popping , J. Blaizot , S. Courty , J. M. Deharveng , C. Peroux , R. Teyssier , C. D. Martin

The structure function of opacity fluctuations is a useful statistical tool to study tiny scale structures of neutral hydrogen. Here we present high resolution observation of HI absorption towards 3C 138, and estimate the structure function…

Astrophysics of Galaxies · Physics 2013-02-20 Nirupam Roy , Anthony H. Minter , W. M. Goss , Crystal L. Brogan , T. J. W. Lazio

(Abridged) With the SMA we have made high angular-resolution (~1" = 160 AU) observations of the protobinary system IRAS 16293-2422 in the J = 4-3 lines of HCN and HC^15N, and in the continuum at 354.5 GHz. The HCN (4-3) line was also…

Galaxy and occupies perhaps a quarter of the volume of the Galactic disk. Decoding the spectrum of the Galactic diffuse ionizing field is of fundamental interest. This can be done via direct measurements of ionization fractions of various…

Astrophysics of Galaxies · Physics 2023-03-07 S. R. Kulkarni , Charles Beichman , Michael E. Ressler

(Abridged) The physical structure of deeply-embedded low-mass protostars (Class 0) on scales of less than 300 AU is still poorly constrained. Determining this is crucial for understanding the physical and chemical evolution from cores to…

Solar and Stellar Astrophysics · Physics 2016-05-04 M. V. Persson , D. Harsono , J. J. Tobin , E. F. van Dishoeck , J. K. Jørgensen , N. Murillo , S. -P. Lai

(Abridged) We discuss the nonlinear development of the isobaric mode of thermal instability (TI) in the context of the atomic interstellar medium (ISM), in order to assess the ability of TI to establish a well-segregated multi-phase…

Astrophysics · Physics 2009-11-07 F. J. Sanchez-Salcedo , E. Vazquez-Semadeni , A. Gazol

The cooling transition temperature gas in the interstellar medium (ISM), traced by the high ions, Si IV, C IV, N V, and O VI, helps to constrain the flow of energy from the hot ISM with T >10^6 K to the warm ISM with T< 2x10^4 K. We…

Astrophysics of Galaxies · Physics 2015-05-20 N. Lehner , W. F. Zech , J. C. Howk , B. D. Savage

Incommensurate modulated structure (IMS) in Bi2Sr1.6La0.4CuO6+{\delta} (BSLCO) has been studied by aberration corrected transmission electron microscopy in combination with high-dimensional (HD) space description. Two images in the negative…

Materials Science · Physics 2015-09-02 Binghui Ge , Yumei Wang , Fanghua Li , Huiqian Luo , Haihu Wen , Rong Yu , Zhiying Cheng , Jing Zhu

Analyses of cosmological hydrodynamic simulations of galaxy clusters suggest that X-ray masses can be underestimated by 10% to 30%. The largest bias originates by both violation of hydrostatic equilibrium and an additional temperature bias…

In this paper, we report our investigation of pulsar scintillation phenomena by monitoring PSR B0355$+$54 at 2.25 GHz for three successive months using \emph{Kunming 40-m radio telescope}. We have measured the dynamic spectrum, the…

We present an analysis of the molecular and atomic gas emission in the rest-frame far-infrared and sub-millimetre, from the lensed z=2.3 sub-millimetre galaxy SMM J2135-0102. We obtain very high signal-to-noise detections of 11 transitions…