Zobrazeno 1 - 10
of 782
pro vyhledávání: '"Shull J"'
Autor:
Postman, Marc, Lauer, Tod R., Parker, Joel W., Spencer, John R., Weaver, Harold A., Shull, J. Michael, Stern, S. Alan, Brandt, Pontus, Conard, Steven J., Gladstone, G. Randall, Lisse, Carey M., Porter, Simon D., Singer, Kelsi N., Verbiscer, Anne J.
We obtained New Horizons LORRI images to measure the cosmic optical background (COB) intensity integrated over $0.4\lesssim\lambda\lesssim0.9{~\rm\mu m}.$ The survey comprises 16 high Galactic-latitude fields selected to minimize scattered diffuse Ga
Externí odkaz:
http://arxiv.org/abs/2407.06273
Interstellar dust at high Galactic latitudes can influence astronomical foreground subtraction, produce diffuse scattered light, and soften the ultraviolet spectra of quasars. In a sample of 94 sight lines toward quasars at high latitude and low exti
Externí odkaz:
http://arxiv.org/abs/2310.12205
Autor:
Fesen, Robert A., Kimeswenger, Stefan, Shull, J. Michael, Drechsler, Marcel, Strottner, Xavier, Sainty, Yann, Falls, Bray, Vergnes, Christophe, Martino, Nicolas, Walker, Sean, Rupert, Justin
Drechsler et al. (2023) reported the unexpected discovery of a 1.5 degree long [O III] emission nebula 1.2 degrees southeast of the M31 nucleus. Here we present additional images of this large emission structure, called SDSO, along with radial veloci
Externí odkaz:
http://arxiv.org/abs/2307.06308
Autor:
Shull, J. Michael, Kulkarni, S. R.
Bow-shocks are produced in the local interstellar medium by the passage of fast stars from the Galactic thin-disk and thick-disk populations with velocities $V_* = $ 40-80 km/s. Stellar transits of local H I clouds occur every 3500-7000 yr on average
Externí odkaz:
http://arxiv.org/abs/2305.13449
Autor:
Kulkarni, S. R., Shull, J. Michael
The Galactic interstellar medium abounds in low-velocity shocks with velocities less than, say, about 70 km/s. Some are descendants of higher velocity shocks, while others start off at low velocity (e.g., stellar bow shocks, intermediate velocity clo
Externí odkaz:
http://arxiv.org/abs/2302.13963
Autor:
Ritchey, Adam M., Jenkins, Edward B., Shull, J. Michael, Savage, Blair D., Federman, S. R., Lambert, David L.
Publikováno v:
ApJ, 952:57 (26pp), 2023
In this investigation, we present an analysis of the metallicity distribution that pertains to neutral gas in the local Galactic interstellar medium (ISM). We derive relative ISM metallicities for a sample of 84 sight lines probing diffuse atomic and
Externí odkaz:
http://arxiv.org/abs/2301.09743
We revisit the reliability of metallicity estimates of high velocity clouds with the help of hydrodynamical simulations. We quantify the effect of accretion and viewing angle on metallicity estimates derived from absorption lines. Model parameters ar
Externí odkaz:
http://arxiv.org/abs/2111.00546
We report results from a FUSE survey of interstellar molecular hydrogen (H2) in the Galactic disk toward 139 O-type and early B-type stars at Galactic latitudes $|b| < 10^{\circ}$, with updated photometric and parallax distances. The H2 absorption is
Externí odkaz:
http://arxiv.org/abs/2102.11301
Autor:
Guillard, P., Appleton, P. N, Boulanger, F., Shull, J. M., Lehnert, M. D., Forets, G. Pineau des, Falgarone, E., Cluver, M. E., Xu, C. K., Gallagher, S. C., Duc, P. A.
We present Hubble Space Telescope Cosmic Origin Spectrograph (COS) UV line spectroscopy and integral-field unit (IFU) observations of the intra-group medium in Stephan's Quintet (SQ). SQ hosts a 30 kpc long shocked ridge triggered by a galaxy collisi
Externí odkaz:
http://arxiv.org/abs/2102.06843
For application to surveys of interstellar matter and Galactic structure, we compute new spectrophotometric distances to 139 OB stars frequently used as background targets for UV spectroscopy. Many of these stars have updated spectral types and digit
Externí odkaz:
http://arxiv.org/abs/1907.13148