Results 101 to 110 of about 57,383 (218)

An extended XMM-Newton observation of the Seyfert galaxy NGC 4051. I. Evidence for a shocked outflow

, 2010
An extended XMM-Newton observation of the Seyfert 1 galaxy NGC 4051 has revealed a rich absorption line spectrum indicating the presence of a photoionized outflow with a wide range of velocities and ionization parameter.
Pounds, K. A., Vaughan, S.
core   +1 more source

Ultraviolet Properties of Multiphase Gas toward the Inner Galaxy

The Astrophysical Journal
We present a systematic study of the multiphase interstellar gas in the inner Galaxy using Hubble Space Telescope/STIS absorption spectroscopy of 16 massive stars located at spectroscopic distances between 1.3 and 10 kpc in the region −30° ≲  l  ≲ +30 ...
Frances H. Cashman, Andrew J. Fox, Debopam Som, Bart P. Wakker, Robert A. Benjamin, Dhanesh Krishnarao, David M. French, Rongmon Bordoloi, Felix J. Lockman   +8 more
doaj   +1 more source

Small scale H I structure and the soft X-ray background [PDF]

The observed anticorrelation between diffuse soft X-ray flux and H I column density has been explained as absorption of soft X-rays produced in a hot galactic halo, assuming that the neutral interstellar material is sufficiently clumped to reduce the ...
Jahoda, K., Lockman, F. J., Mccammon, D.
core   +1 more source

Observation of interstellar lithium in the low-metallicity Small Magellanic Cloud

, 2012
The primordial abundances of light elements produced in the standard theory of Big Bang nucleosynthesis (BBN) depend only on the cosmic ratio of baryons to photons, a quantity inferred from observations of the microwave background.
AJ Korn, BD Fields, Brian D. Fields, D Romano, DC Knauth, DE Welty, DE Welty, DE Welty, DL Lambert, F Iocco, G Steigman, G Steigman, Grant J. Mathews, H Dekker, J Dunkley, J Meléndez, J. Christopher Howk, JC Weingartner, K Jedamzik, L Sbordone, M Asplund, M Pospelov, M Spite, N Prantzos, Nicolas Lehner, NLJ Cox, RH Cyburt, S Kawanomoto, SIB Cartledge, T Prodanović, TK Suzuki   +30 more
core   +1 more source

Aperture and Resolution Effects on Ultraviolet Star-forming Properties: Insights from Local Galaxies and Implications for High-redshift Observations

The Astrophysical Journal
We present an analysis of the effects of spectral resolution and aperture scale on derived galaxy properties using far-ultraviolet (FUV) spectra of local star-forming galaxies from the International Ultraviolet Explorer ( R ∼ 250, field of view (FOV ...
Ilyse Clark, Danielle A. Berg, Claus Leitherer, Karla Z. Arellano-Córdova, Andreas A. C. Sander   +4 more
doaj   +1 more source

CO Line Emission and Absorption from the HL Tau Disk: Where is all the dust?

, 2005
We present high-resolution infrared spectra of HL Tau, a heavily embedded young star. The spectra exhibit broad emission lines of hot CO gas as well as narrow absorption lines of cold CO gas. The column density for this cooler material (7.5+/-0.2 x 10^18
Carr J. S., Craig Kulesa, Monin J. L., Sean D. Brittain, Terrence W. Rettig, Theodore Simon, Whittet D. C. B., Whittet D. C. B.   +7 more
core   +1 more source

Physical conditions in the ISM towards HD185418

, 2005
We have developed a complete model of the hydrogen molecule as part of the spectral simulation code Cloudy. Our goal is to apply this to spectra of high-redshift star-forming regions where H2 absorption is seen, but where few other details are known, to ...
Dubernet M. L., G. J. Ferland, Gargi Shaw, Giard M., Gredel R., Mathis J. S., N. P. Abel, Pequinot D., Petitjean P., Pottasch S. R., R. Srianand, Rachford B. L., Seaton M. J., Verner D. A.   +13 more
core   +1 more source

oMEGACat. VII. Tracing Interstellar and Intracluster Medium of ω Centauri Using Sodium Absorptions

The Astrophysical Journal
We investigate the foreground interstellar medium along the line of sight and intracluster medium of ω Centauri ( ω Cen) by measuring the equivalent width of Na I D absorptions from MUSE observations. The large line-of-sight velocity difference between ω
Z. Wang, A. C. Seth, M. Latour, J. Strader, M. Häberle, N. Neumayer, C. Clontz, S. Kamann, M. S. Nitschai, M. Alfaro-Cuello, A. Bellini, A. Feldmeier-Krause, M. Libralato, A. P. Milone, P. J. Smith, S. O. Souza, G. van de Ven   +16 more
doaj   +1 more source

Interstellar absorption lines in the spectrum of zeta Ophiuchi

The Astrophysical Journal, 1975
The far-UV spectrum of Zeta Pup is surveyed as obtained from scans by Copernicus satellite detectors. Equivalent widths are tabulated for 147 lines from 35 different ions or isotopes of 19 elements in the direction of Zeta Pup. In addition, 52 unidentified absorption lines are listed whose narrow widths indicate an interstellar origin.
openaire   +1 more source

Absorption and Self-absorption of [C ii] and [O i] Far Infrared Lines toward a Bright Bubble in the Nessie Infrared Dark Cloud

The Astrophysical Journal
Using the upGREAT instrument on board the Stratospheric Observatory for Infrared Astronomy, we imaged [C ii ] 157.74 and [O i ] 63.18 μ m line emission from a bright photodissociation region (PDR) associated with an ionized bubble located in the Nessie ...
James M. Jackson, J. Scott Whitaker, Edward Chambers, Robert Simon, Cristian Guevara, David Allingham, Philippa Patterson, Nicholas Killerby-Smith, Jacob Askew, Thomas Vandenberg, Howard A. Smith, Patricio Sanhueza, Ian W. Stephens, Lars Bonne, Fiorella L. Polles, Anika Schmiedeke, Netty Honigh, Matthias Justen   +17 more
doaj   +1 more source