Zobrazeno 1 - 10
of 355
pro vyhledávání: '"Heiles, Carl"'
Autor:
Park, Gyueun, Lee, Min-Young, Bialy, Shmuel, Burkhart, Blakesley, Dawson, J. R., Heiles, Carl, Li, Di, Murray, Claire, Nguyen, Hiep, Hafner, Anita, Rybarczyk, Daniel R., Stanimirović, Snežana
In this paper, we investigate the conditions for the HI-to-H$_{2}$ transition in the solar neighborhood by analyzing HI emission and absorption measurements toward 58 Galactic lines of sight (LOSs) along with $^{12}$CO(1$-$0) (CO) and dust data. Base
Externí odkaz:
http://arxiv.org/abs/2307.09513
Autor:
Petzler, Anita, Dawson, J. R., Nguyen, Hiep, Heiles, Carl, Wardle, M., Lee, M. -Y., Murray, Claire E., Thompson, K. L., Stanimirovic, Snezana
We present observations of the four 2 Pi 3/2 J = 3/2 ground-rotational state transitions of the hydroxyl molecule (OH) along 107 lines of sight both in and out of the Galactic plane: 92 sets of observations from the Arecibo telescope and 15 sets of o
Externí odkaz:
http://arxiv.org/abs/2302.11116
Autor:
Ching, Tao-Chung, Li, Di, Heiles, Carl, Li, Zhi-Yun, Qian, Lei, Yue, Youling, Tang, Jing, Jiao, Sihan
Magnetic fields play an important role in the evolution of interstellar medium and star formation. As the only direct probe of interstellar field strength, credible Zeeman measurements remain sparse due to the lack of suitable Zeeman probes, particul
Externí odkaz:
http://arxiv.org/abs/2112.12644
Autor:
Tang, Ningyu, Li, Di, Luo, Gan, Heiles, Carl, Qin, Sheng-Li, Wang, Junzhi, Xia, Jifeng, Chen, Longfei
We present high-sensitivity CH 9 cm ON/OFF observations toward 18 extra-galactic continuum sources that have been detected with OH 18 cm absorption in the Millennium survey with the Arecibo telescope. CH emission was detected toward six of eighteen s
Externí odkaz:
http://arxiv.org/abs/2109.07822
Autor:
Murray, Claire E., Stanimirović, Snežana, Heiles, Carl, Dickey, John M., McClure-Griffiths, N. M., Lee, M. -Y., Goss, W. M., Killerby-Smith, Nicholas
Tracing the transition between the diffuse atomic interstellar medium (ISM) and cold, dense gas is crucial for deciphering the star formation cycle in galaxies. Here we present MACH, a new survey of cold neutral hydrogen (HI) absorption at $21\rm\,cm
Externí odkaz:
http://arxiv.org/abs/2106.15614
Autor:
Liu, Mengting, Krčo, Marko, Li, Di, Hobbs, George, Dawson, J. R., Heiles, Carl, Jameson, Andrew, Stanimirović, Snežana, Johnston, Simon, Dickey, John M.
Publikováno v:
The Astrophysical Journal Letters, 2021, Volume 911, Issue 1, id.L13, 9 pp
Optical depth variations in the Galactic neutral interstellar medium (ISM) with spatial scales from hundreds to thousands of astronomical units have been observed through HI absorption against pulsars and continuum sources, while extremely small stru
Externí odkaz:
http://arxiv.org/abs/2104.07897
Autor:
Reach, William T., Heiles, Carl
The diffuse interstellar medium is dynamic, and its chemistry and evolution is determined by shock fronts as well as photodissociation. Shocks are implied by the supersonic motions and velocity dispersion often statistically called "turbulence". We c
Externí odkaz:
http://arxiv.org/abs/2101.02139
Autor:
Tang, Ningyu, Li, Di, Yue, Nannan, Zuo, Pei, Liu, Tie, Luo, Gan, Chen, Longfei, Qin, Sheng-Li, Wu, Yuefang, Heiles, Carl
We have conducted OH 18 cm survey toward 141 molecular clouds in various environments, including 33 optical dark clouds, 98 Planck Galactic cold clumps (PGCCs) and 10 Spitzer dark clouds with the Arecibo telescope. The deviations from local thermal e
Externí odkaz:
http://arxiv.org/abs/2010.09264
Autor:
Rybarczyk, Daniel R., Stanimirovic, Snezana, Zweibel, Ellen G., Murray, Claire E., Dickey, John M., Babler, Brian, Heiles, Carl
We have studied the small scale distribution of atomic hydrogen (HI) using 21-cm absorption spectra against multiple-component background radio continuum sources from the 21-SPONGE survey and the Millennium Arecibo Absorption Line Survey. We have fou
Externí odkaz:
http://arxiv.org/abs/2002.10471
Autor:
Nguyen, Hiep, Dawson, J. R., Lee, Min-Young, Murray, Claire E., Stanimirovic, Snezana, Heiles, Carl, Miville-Deschenes, M. -A., Petzler, Anita
We report Arecibo 21 cm absorption-emission observations to characterise the physical properties of neutral hydrogen (HI) in the proximity of five giant molecular clouds (GMCs): Taurus, California, Rosette, Mon OB1, and NGC 2264. Strong HI absorption
Externí odkaz:
http://arxiv.org/abs/1906.06846