Zobrazeno 1 - 10
of 4 146
pro vyhledávání: '"Chen, H W"'
Autor:
Deka, P. P., Gupta, N., Chen, H. W., Johnson, S. D., Noterdaeme, P., Combes, F., Boettcher, E., Balashev, S. A., Emig, K. L., Józsa, G. I. G., Klöckner, H. -R., Krogager, J-. K., Momjian, E., Petitjean, P., Rudie, G. C., Wagenveld, J., Zahedy, F. S.
We report a new, rare detection of HI 21-cm absorption associated with a quasar (only six known at $1
Externí odkaz:
http://arxiv.org/abs/2311.00336
Autor:
Schady, P., Yates, R. M., Christensen, L., De Cia, A., Rossi, A., D'Elia, V., Heintz, K. E., Jakobsson, P., Laskar, T., Levan, A., Salvaterra, R., Starling, R. L. C., Tanvir, N. R, Thöne, C. C., Vergani, S., Wiersema, K., Arabsalmani, M ., Chen, H. -W., De Pasquale, M., Fruchter, A., Fynbo, J. P. U., García-Benito, R., Gompertz, B., Hartmann, D., Kouveliotou, C., Milvang-Jensen, B., Palazzi, E., Perley, D., Piranomonte, S., Pugliese, G., Savaglio, S., Sbarufatti, B., Schulze, S., Tagliaferri, G., Postigo, A. de Ugarte, Watson, D., Wiseman, P.
Much of what is known of the chemical composition of the universe is based on emission line spectra from star forming galaxies. Emission-based inferences are, nevertheless, model-dependent and they are dominated by light from luminous star forming re
Externí odkaz:
http://arxiv.org/abs/2310.15967
Autor:
Rupke, D. S. N., Wylezalek, D., Zakamska, N. L., Veilleux, S., Bertemes, C., Ishikawa, Y., Liu, W., Sankar, S., Vayner, A., Lim, H. X. G., McCrory, R., Murphree, G., Whitesell, L., Shen, L., Liu, G., Barrera-Ballesteros, J. K., Chen, H. -W., Diachenko, N., Goulding, A. D., Greene, J. E., Hainline, K. N., Hamann, F., Heckman, T., Johnson, S. D., Lutz, D., Lützgendorf, N., Mainieri, V., Nesvadba, N., Ogle, P., Sturm, E.
Publikováno v:
2023ApJ...953L..26R
The [OIII] 5007 A emission line is the most common tracer of warm, ionized outflows in active galactic nuclei across cosmic time. JWST newly allows us to use mid-infrared spectral features at both high spatial and spectral resolution to probe these s
Externí odkaz:
http://arxiv.org/abs/2306.12541
Autor:
Jones, J. Dorigo, Johnson, S. D., Muzahid, Sowgat, Charlton, J., Chen, H. -W., Narayanan, A., Sameer, Schaye, J., Wijers, N. A.
Blazars are some of the brightest UV and X-ray sources in the sky and are valuable probes of the elusive warm-hot intergalactic medium (WHIM; $T{\simeq} 10^5-10^7$ K). However, many of the brightest blazars$-$called BL Lac objects such as 1ES1553+113
Externí odkaz:
http://arxiv.org/abs/2111.06927
Autor:
Gupta, N., Shukla, G., Srianand, R., Krogager, J-. K., Noterdaeme, P., Baker, A. J., Combes, F., Fynbo, J. P. U., Momjian, E., Hilton, M., Hussain, T., Moodley, K., Petitjean, P., Chen, H. -W., Deka, P., Dutta, R., Jose, J., Jozsa, G. I. G., Kaski, C., Klockner, H. -R., Knowles, K., Sikhosana, S., Wagenveld, J.
We present results of an optical spectroscopic survey using SALT and NOT to build a WISE mid-infrared color-based, dust-unbiased sample of powerful radio-bright ($>$200 mJy at 1.4 GHz) AGN for the MeerKAT Absorption Line Survey (MALS). Our sample has
Externí odkaz:
http://arxiv.org/abs/2107.09705
Autor:
Combes, F., Gupta, N., Muller, S., Balashev, S., Jozsa, G. I. G., Srianand, R., Momjian, E., Noterdaeme, P., Kloeckner, H. -R., Baker, A. J., Boettcher, E., Bosma, A., Chen, H. -W., Dutta, R., Jagannathan, P., Jose, J., Knowles, K., Krogager, J-. K., Kulkarni, V. P., Moodley, K., Pandey, S., Petitjean, P., Sekhar, S.
Publikováno v:
A&A 648, A116 (2021)
The Large Survey Project (LSP) "MeerKAT Absorption Line Survey" (MALS) is a blind HI 21-cm and OH 18-cm absorption line survey in the L- and UHF-bands, with the primary goal to better determine the occurrence of atomic and molecular gas in the circum
Externí odkaz:
http://arxiv.org/abs/2101.00188
Autor:
Gupta, N., Jagannathan, P., Srianand, R., Bhatnagar, S., Noterdaeme, P., Combes, F., Petitjean, P., Jose, J., Pandey, S., Kaski, C., Baker, A. J., Balashev, S. A., Boettcher, E., Chen, H. -W., Cress, C., Dutta, R., Goedhart, S., Heald, G., Józsa, G. I. G., Kamau, E., Kamphuis, P., Kerp, J., Klöckner, H. -R., Knowles, K., Krishnan, V., Krogager, J-. K., Kulkarni, V. P., Momjian, E., Moodley, K., Passmoor, S., Schröeder, A., Sekhar, S., Sikhosana, S., Wagenveld, J., Wong, O. I.
We present details of the Automated Radio Telescope Imaging Pipeline (ARTIP) and results of a sensitive blind search for HI and OH absorbers at $z<0.4$ and $z<0.7$, respectively. ARTIP is written in Python 3.6, extensively uses the Common Astronomy S
Externí odkaz:
http://arxiv.org/abs/2007.04347
Akademický článek
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Autor:
Voit, G. M., Babul, A., Babyk, Iu., Bryan, G. L., Chen, H. -W., Donahue, M., Fielding, D., Gaspari, M., Li, Y., McDonald, M., O'Shea, B. W., Prasad, D., Sharma, P., Sun, M., Tremblay, G., Werk, J., Werner, N., Zahedy, F.
During the last decade, numerous and varied observations, along with increasingly sophisticated numerical simulations, have awakened astronomers to the central role the circumgalactic medium (CGM) plays in regulating galaxy evolution. It contains the
Externí odkaz:
http://arxiv.org/abs/1903.11212
Cosmic gas cycles in and out of galaxies, but outside of galaxies it is difficult to observe except for the absorption lines that circumgalactic clouds leave in the spectra of background quasars. Using photoionization modeling of those lines to deter
Externí odkaz:
http://arxiv.org/abs/1903.00084