Results 101 to 110 of about 63,480 (217)

Analytic formulas for frequency and size dependence of absorption and scattering efficiencies of astronomical polycyclic aromatic hydrocarbons

, 2012
In a series of two recent papers, the frequency and size distribution dependence of extinction spectra for astronomical silicate and graphite grains was analyzed by us in the context of MRN type interstellar dust models.
Ashim K. Roy, Cardelli, Cecchi-Pestellini, Donn, Draine, Draine, Draine, Fitzpatrick, Klacka, Li, Li, Li, Mathis, Pendorf, Platt, Pritesh Ranadive, Ranjan Gupta, Roy, Roy, Subodh K. Sharma, Weingartner   +20 more
core   +1 more source

Correlations between Dust Extinction Features across All Wavelength Scales: From Diffuse Interstellar Bands to R(V)

The Astrophysical Journal
Understanding variations in the dust extinction curve is imperative for using dust as a tracer of local structure in the interstellar medium, understanding dust chemistry, and performing extinction corrections.
Andrew K. Saydjari, Gregory M. Green
doaj   +1 more source

Interstellar absorptions and shocked clouds towards supernova remnant RX J0852.0-4622

, 2012
We present results of survey of interstellar absorptions towards supernova remnant (SNR) RX J0852.0-4622. The distribution of KI absorbers along the distance of the background stars is indicative of a local region (d100km/s towards three stars and ...
A. F. Iyudin, Aschenbach, Bertin, Bocchino, Borkowski, Braun, Cha, Cha, Cox, Crawford, Crawford, Danks, Draine, Famaey, Friedman, Gredel, Iyudin, Iyudin, Jenkins, Jenkins, Jura, Klein, Kritsuk, Kupka, McKee, N. N. Chugai, Patnaude, Rots, Routly, Savage, Shull, Stanimirović, Sutherland, Tielens, Tsymbal, Wallerstein, Welty, Welty, Welty, Welty, Woermann, Wolfire, Wolfire, Yu. V. Pakhomov   +43 more
core   +1 more source

Attenuation of LHAASO PeVatrons by the Interstellar Radiation Field and Cosmic Microwave Background Radiation

The Astrophysical Journal
“PeVatrons” refer to astrophysical sources capable of accelerating particles to energies around 10 ^15 electron volts and higher, potentially contributing to the cosmic-ray spectrum in the knee region.
Jianli Zhang, YiQing Guo
doaj   +1 more source

Interstellar grain mantles [PDF]

Interstellar molecular grain mantles are an important component of the interstellar dust inside dense molecular clouds as evidenced by the detection of absorption bands at 2.97, 3.08, 4.61, 6.0 and 6.8 microns.
Allamandola, Louis J., Bregman, J., Tielens, Alexander G. G. M., Witteborn, F. C.   +3 more
core   +1 more source

The D/H Ratio in Interstellar Gas Towards G191-B2B

, 1999
We reinvestigate the question of spatial variation of the local D/H abundance, using both archival GHRS spectra, and new echelle spectra of G191-B2B obtained with the Space Telescope Imaging Spectrograph (STIS) aboard HST.
C. A. Bowers, D. Lindler, F. C. Bruhweiler, I. Hubeny, J. B. Holberg, K. Feggans, Lallement R., M. A. Barstow, M. S. Sahu, T. R. Gull, Vauclair G., Vidal-Madjar A., W. Landsman   +12 more
core   +1 more source

A Neutral Hydrogen Absorption Study of Cold Gas in the Outskirts of the Magellanic Clouds Using the GASKAP-H i Survey

The Astronomical Journal
Cold neutral hydrogen (H i ) is a crucial precursor for molecular gas formation and can be studied via H i absorption. This study investigates H i absorption in low column density regions of the Small and Large Magellanic Clouds (SMC and LMC) using the ...
Hongxing Chen, Snežana Stanimirović, Nickolas M. Pingel, James Dempsey, Frances Buckland-Willis, Susan E. Clark, Helga Dénes, John M. Dickey, Steven Gibson, Katherine Jameson, Ian Kemp, Denis Leahy, Min-Young Lee, Callum Lynn, Yik Ki Ma, N. M. McClure-Griffiths, Claire E. Murray, Hiep Nguyen, Lucero Uscanga, Jacco Th. van Loon, Enrique Vázquez-Semadeni   +20 more
doaj   +1 more source

High ions towards white dwarfs: circumstellar line shifts and stellar temperature

, 2011
Based on a compilation of OVI, CIV, SiIV and NV data from IUE, FUSE, GHRS, STIS, and COS, we derive an anti- correlation between the stellar temperature and the high ion velocity shift w.r.t. to the photosphere, with positive (resp.
B. Y. Welsh, Ballet, Bannister, Barstow, Barstow, Barstow, Barstow, Borkowski, Bruhweiler, Christian, Cox, Dalton, Dupree, Dupuis, Farihi, Farihi, Farihi, Finley, Gnat, Holberg, Holberg, Holberg, Kilic, Knauth, Koester, Koutroumpa, Lallement, Landsman, Lehner, M. A. Barstow, Marsh, Melis, Oegerle, Peek, R. Lallement, Redfield, S. L. Casewell, Saffer, Savage, Slavin, Slavin, Vennes, Vennes, Vennes, Vergely, Welsh, Welsh, Welsh, Welsh, Werner, Zuckerman   +50 more
core   +2 more sources

Sloan Digital Sky Survey IV MaStar: Quantification and Abatement of Interstellar Absorption in the Largest Empirical Stellar Spectral Library

The Astrophysical Journal
We assess the impact of Ca ii λ λ 3934, 3969 and Na i λ λ 5891, 5897 absorption arising in the interstellar medium (ISM) on the Sloan Digital Sky Survey-IV MaNGA Stellar Library (MaStar) and produce corrected spectroscopy for 80% of the 24,162-star ...
Kate H. R. Rubin, Kyle B. Westfall, Claudia Maraston, Daniel Thomas, Renbin Yan, J. Christopher Howk, Erick Aguirre, Kaelee S. Parker, David R. Law   +8 more
doaj   +1 more source

The Ammount of Interstellar Carbon Locked in Solid Hydrogenated Amorphous Carbon

, 1999
We review the literature and present new experimental data to determine the amount of carbon likely to be locked in form of solid hydrogenated amorphous carbon (HAC) grains. We conclude on the basis of a thorough analysis of the intrinsic strength of the
Adamson A. J., Adolf N. Witt, Borghesi A., Bussoletti E., Colangeli L., Douglas G. Furton, Duley W. W., d’Hendecourt L. B., Jaeger C., Jenniskens P., John W. Laiho, Jones A. P., Ledoux G., Li A., McFadzean A. D., McKenzie D. R., Silva S. R. P.   +16 more
core   +1 more source