Results 31 to 40 of about 210,358 (255)

Diagnosing the interstellar medium of galaxies with far-infrared emission lines [PDF]

Astronomy & Astrophysics, 2021
Context. Atomic fine structure lines have been detected in the local Universe and at high redshifts over the past decades. The [C II] emission line at 158 μm is an important observable as it provides constraints on the interstellar medium (ISM) cooling processes. Aims.
A. F. Ramos Padilla, L. Wang, S. Ploeckinger, F. F. S. van der Tak, S. C. Trager   +4 more
openaire   +3 more sources

The [CII] 158 micron line emission in high-redshift galaxies [PDF]

, 2017
The [CII] fine structure transition at 158 microns is the dominant cooling line of cool interstellar gas, and is the brightest of emission lines from star forming galaxies from FIR through meter wavelengths.
G. Lagache, M. Cousin, M. Chatzikos
semanticscholar   +1 more source

SÍGAME Simulations of the , , and Line Emission from Star-forming Galaxies at [PDF]

, 2017
Of the almost 40 star-forming galaxies at (not counting quasi-stellar objects) observed in to date, nearly half are either very faint in or not detected at all, and fall well below expectations based on locally derived relations between star formation ...
K. Olsen, T. Greve, D. Narayanan, R. Thompson, R. Davé, Luis Niebla Rios, S. Stawinski   +6 more
semanticscholar   +1 more source

Laboratory Measurement of Millimeter-wave Transitions of 13CH2DOH for Astronomical Use

The Astrophysical Journal, 2022
Methanol (CH _3 OH) is an abundant interstellar species and is known to be an important precursor of various interstellar complex organic molecules. Among the methanol isotopologues, CH _2 DOH is one of the most abundant isotopologues and it is often ...
Yuki Ohno, Takahiro Oyama, Akemi Tamanai, Shaoshan Zeng, Yoshimasa Watanabe, Riouhei Nakatani, Takeshi Sakai, Nami Sakai   +7 more
doaj   +1 more source

Discovery of Pulsed OH Maser Emission Stimulated by a Pulsar [PDF]

, 2005
Stimulated emission of radiation has not been directly observed in astrophysical situations up to this time. Here we demonstrate that photons from pulsar B1641-45 stimulate pulses of excess 1720 MHz line emission in an interstellar OH cloud.
Johnston, Simon, Koribalski, Baerbel, Stanimirovic, Snezana, Weisberg, Joel M.   +3 more
core   +4 more sources

Hitomi Observation of Radio Galaxy NGC 1275: The First X-ray Microcalorimeter Spectroscopy of Fe-K{\alpha} Line Emission from an Active Galactic Nucleus [PDF]

, 2017
The origin of the narrow Fe-K alpha fluorescence line at 6.4 keV from active galactic nuclei has long been under debate; some of the possible sites are the outer accretion disk, the broad line region, a molecular torus, or interstellar/intracluster media.
H. C. F. Aharonian, H. Akamatsu, F. Akimoto, S. Allen, L. Angelini, M. Audard, H. Awaki, M. Axelsson, A. Bamba, M. Bautz, R. Blandford, L. Brenneman, G. Brown, E. Bulbul, E. Cackett, M. Chernyakova, M. Chiao, P. Coppi, E. Costantini, J. Plaa, C. Vries, J. Herder, C. Done, T. Dotani, K. Ebisawa, M. Eckart, T. Enoto, Y. Ezoe, A. Fabian, C. Ferrigno, A. Foster, R. Fujimoto, Y. Fukazawa, A. Furuzawa, M. Galeazzi, L. Gallo, P. Gandhi, M. Giustini, A. Goldwurm, L. Gu, M. Guainazzi, Y. Haba, K. Hagino, K. Hamaguchi, I. Harrus, I. Hatsukade, K. Hayashi, T. Hayashi, K. Hayashida, J. Hiraga, A. Hornschemeier, A. Hoshino, J. Hughes, Y. Ichinohe, R. Iizuka, H. Inoue, Y. Inoue, M. Ishida, K. Ishikawa, Y. Ishisaki, M. Iwai, J. Kaastra, T. Kallman, T. Kamae, J. Kataoka, S. Katsuda, N. Kawai, R. Kelley, C. Kilbourne, T. Kitaguchi, S. Kitamoto, T. Kitayama, T. Kohmura, M. Kokubun, K. Koyama, S. Koyama, P. Kretschmar, H. Krimm, A. Kubota, H. Kunieda, P. Laurent, Shiu-Hang Lee, M. Leutenegger, O. Limousin, M. Loewenstein, K. Long, D. Lumb, G. Madejski, Y. Maeda, D. Maier, K. Makishima, M. Markevitch, H. Matsumoto, K. Matsushita, D. McCammon, B. McNamara, M. Mehdipour, E. Miller, Jonathan M. Miller, S. Mineshige, K. Mitsuda, I. Mitsuishi, T. Miyazawa, T. Mizuno, H. Mori, K. Mori, K. Mukai, H. Murakami, R. Mushotzky, T. Nakagawa, H. Nakajima, T. Nakamori, S. Nakashima, K. Nakazawa, K. Nobukawa, M. Nobukawa, H. Noda, H. Odaka, T. Ohashi, M. Ohno, T. Okajima, N. Ota, M. Ozaki, F. Paerels, S. Paltani, R. Petre, C. Pinto, F. Porter, K. Pottschmidt, C. Reynolds, S. Safi-Harb, S. Saito, K. Sakai, T. Sasaki, G. Sato, Kosuke Sato, R. Sato, M. Sawada, N. Schartel, P. Serlemitsos, H. Seta, M. Shidatsu, A. Simionescu, Randall K. Smith, Y. Soong, L. Stawarz, Y. Sugawara, S. Sugita, A. Szymkowiak, H. Tajima, H. Takahashi, Tadayuki Takahashi, S. Takeda, Y. Takei, T. Tamagawa, T. Tamura, Takaaki Tanaka, Yasuo Tanaka, Yasuyuki T. Tanaka, M. Tashiro, Y. Tawara, Y. Terada, Y. Terashima, F. Tombesi, H. Tomida, Y. Tsuboi, M. Tsujimoto, H. Tsunemi, T. Tsuru, H. Uchida, H. Uchiyama, Y. Uchiyama, S. Ueda, Y. Ueda, S. Uno, C. M. Urry, E. Ursino, S. Watanabe, N. Werner, D. Wilkins, B. Williams, S. Yamada, H. Yamaguchi, K. Yamaoka, N. Yamasaki, M. Yamauchi, S. Yamauchi, T. Yaqoob, Y. Yatsu, D. Yonetoku, I. Zhuravleva, A. Zoghbi, T. Kawamuro   +192 more
semanticscholar   +1 more source

Measurement of Interstellar Extinction in Emission Line Stars [PDF]

Symposium - International Astronomical Union, 1970
Usually selective interstellar extinction is derived by comparing the spectrum of a reddened star with an unreddened nearby star, preferably of the same spectral type. But in many cases this comparison is not possible, so that new methods have to be used.A direct measure of this quantity is possible when a spectrum shows a number of emission lines as ...
openaire   +1 more source

JADES: Probing interstellar medium conditions at z~5.5-9.5 with ultra-deep JWST/NIRSpec spectroscopy [PDF]

Astronomy & Astrophysics, 2023
We present emission line ratios from a sample of 26 Lyman break galaxies from $z\sim5.5-9.5$ with $-17.010. Our high signal-to-noise spectra reveal more than an order of magnitude of scatter in line ratios such as [OII]/H$\beta$ and [OIII]/[OII ...
A. Cameron, A. Saxena, A. Bunker, F. D’Eugenio, S. Carniani, R. Maiolino, E. Curtis-Lake, P. Ferruit, P. Jakobsen, S. Arribas, N. Bonaventura, S. Charlot, J. Chevallard, M. Curti, T. Looser, M. Maseda, T. Rawle, B. R. D. Pino, R. Smit, H. Ubler, C. Willott, J. Witstok, E. Egami, D. Eisenstein, Benjamin D. Johnson, K. Hainline, M. Rieke, B. Robertson, D. Stark, S. Tacchella, C. Williams, C. Willmer, R. Bhatawdekar, R. Bowler, K. Boyett, C. Circosta, J. Helton, G. Jones, Nimisha Kumari, Z. Ji, E. Nelson, E. Parlanti, L. Sandles, J. Scholtz, F. Sun   +44 more
semanticscholar   +1 more source

Backscattering and Line Broadening in Orion

The Astronomical Journal, 2022
Examination of emission lines in high-velocity-resolution optical spectra of the Orion Nebula confirms that the velocity component on the red wing of the main ionization front emission line is due to backscattering in the Photon Dominated Region.
C. R. O’Dell, G. J. Ferland, J. E. Méndez-Delgado   +2 more
doaj   +1 more source

Discovery of Extensive Optical Emission Associated with the X-ray Bright, Radio Faint Galactic SNR G156.2+5.7 [PDF]

, 2006
We present wide-field Halpha images of the Galactic supernova remnant G156.2+5.7 which reveal the presence of considerable faint Halpha line emission coincident with the remnant's X-ray emission. The outermost Halpha emission consists largely of long and
Fesen, Robert A., Gerardy, Christopher L.   +1 more
core   +4 more sources