Search Results - "Curran, S. J."

The mid-infrared properties and gas content of active galaxies over large lookback times by Curran, S J, Duchesne, S W

“…Abstract Upon an expansion of all of the searches for redshifted H i 21-cm absorption (0.002 1 ≤ z ≤ 5.19), we update recent results regarding the detection of…”
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A correlation between the H i 21-cm absorption strength and impact parameter in external galaxies by Curran, S. J., Reeves, S. N., Allison, J. R., Sadler, E. M.

“…By combining the data from surveys for H i 21-cm absorption at various impact parameters in near-by galaxies, we report an anti-correlation between the 21-cm…”
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H I 21 cm Absorption and Unified Schemes of Active Galactic Nuclei by Curran, S. J, Whiting, M. T

“…In a recent study of z >= 0.1 active galactic nuclei (AGNs), we found that 21 cm absorption has never been detected in objects in which the ultraviolet…”
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FAST Discovery of a Fast Neutral Hydrogen Outflow by Su, Renzhi, Gu, Minfeng, Curran, S. J., Mahony, Elizabeth K., Tang, Ningyu, Allison, James R., Li, Di, Zhu, Ming, Aditya, J. N. H. S., Yoon, Hyein, Zheng, Zheng, Wu, Zhongzu

“…Abstract In this letter, we report the discovery of a fast neutral hydrogen outflow in SDSS J145239.38+062738.0, a merging radio galaxy containing an optical…”
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COMPLETE IONIZATION OF THE NEUTRAL GAS: WHY THERE ARE SO FEW DETECTIONS OF 21 cm HYDROGEN IN HIGH-REDSHIFT RADIO GALAXIES AND QUASARS by CURRAN, S. J, WHITING, M. T

“…From the first published z [gap] 3 survey of 21 cm absorption within the hosts of radio galaxies and quasars, Curran et al. found an apparent dearth of cool…”
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A search for 21cm Hi absorption in AT20G compact radio galaxies by Allison, J. R, Curran, S. J, Emonts, B. H. C, Geréb, K, Mahony, E. K, Reeves, S, Sadler, E. M, Tanna, A, Whiting, M. T, Zwaan, M. A

“…We present results from a search for 21cm associated Hi absorption in a sample of 29 radio sources selected from the Australia Telescope 20GHz survey…”
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QSO photometric redshifts from SDSS, WISE, and GALEX colours by Curran, S J

“…ABSTRACT Machine learning techniques, specifically the k-nearest neighbour algorithm applied to optical band colours, have had some success in predicting…”
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The relationship between the turnover frequency and photo-ionization in radio sources by Curran, S J

“…ABSTRACT We investigate the connection between the turnover frequency in the radio spectrum, νTO, and the rate of ionizing ultraviolet photons, $Q_{\rm…”
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Quasar photometric redshifts from incomplete data using deep learning by Curran, S J

“…ABSTRACT Forthcoming astronomical surveys are expected to detect new sources in such large numbers that measuring their spectroscopic redshift measurements…”
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Intervening or associated? Machine learning classification of redshifted H  i 21-cm absorption by Curran, S J

“…ABSTRACT In a previous paper, we presented the results of applying machine learning to classify whether an H i 21-cm absorption spectrum arises in a source…”
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A survey for redshifted molecular and atomic absorption lines – II. Associated H i, OH and millimetre lines in the z≳ 3 Parkes quarter-Jansky flat-spectrum sample by Curran, S. J., Whiting, M. T., Wiklind, T., Webb, J. K., Murphy, M. T., Purcell, C. R.

“…We present the results of a z≥ 2.9 survey for H i 21-cm and molecular absorption in the hosts of radio quasars using the Giant Metrewave Radio Telescope and…”
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On the scarcity of redshifted OH and millimetre-band molecular absorption by Curran, S J

“…ABSTRACT Despite much searching, redshifted decimetre- and millimetre-band absorption by molecular gas remains very rare, limited to just six systems at zabs ≳…”
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The evolution of cold neutral gas and the star formation history by Curran, S J

“…ABSTRACT There is a well-known disparity between the evolution of the star formation rate density, ψ*, and the abundance of neutral hydrogen (H i), the raw…”
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The large-scale atomic and molecular gas in the Circinus galaxy by Curran, S. J., Koribalski, B. S., Bains, I.

“…We have used the Australia Telescope Compact Array (ATCA) and the Swedish–ESO Submillimetre Telescope (SEST) to map the large-scale atomic and molecular gas in…”
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Limits on variations in fundamental constants from 21-cm and ultraviolet quasar absorption lines by TZANAVARIS, P, WEBB, J. K, MURPHY, M. T, FLAMBAUM, V. V, CURRAN, S. J

“…Quasar absorption spectra at 21-cm and UV rest wavelengths are used to estimate the time variation of x [triple-bond] alpha(2)g(p)mu, where alpha is the fine…”
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A survey for redshifted molecular and atomic absorption lines – I. The Parkes half-Jansky flat-spectrum red quasar sample by Curran, S. J., Whiting, M. T., Murphy, M. T., Webb, J. K., Longmore, S. N., Pihlström, Y. M., Athreya, R., Blake, C.

“…We are currently undertaking a large survey for redshifted atomic and molecular absorption lines at radio frequencies. In this paper, we present the results…”
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New searches for H i 21 cm in damped Lyman α absorption systems by Curran, S. J., Tzanavaris, P., Darling, J. K., Whiting, M. T., Webb, J. K., Bignell, C., Athreya, R., Murphy, M. T.

“…We present the results of three separate searches for H i 21-cm absorption in a total of 12 damped Lyman α absorption systems (DLAs) and sub-DLAs over the…”
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On the absence of molecular absorption in high-redshift millimetre-band searches by Curran, S. J., Whiting, M. T., Combes, F., Kuno, N., Francis, P., Nakai, N., Webb, J. K., Murphy, M. T., Wiklind, T.

“…We have undertaken a search for millimetre-waveband absorption (through the CO and HCO+ rotational transitions) in the host galaxies of reddened radio sources…”
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A search for propylene oxide and glycine in Sagittarius B2 (LMH) and Orion by Cunningham, M. R., Jones, P. A., Godfrey, P. D., Cragg, D. M., Bains, I., Burton, M. G., Calisse, P., Crighton, N. H. M., Curran, S. J., Davis, T. M., Dempsey, J. T., Fulton, B., Hidas, M. G., Hill, T., Kedziora-Chudczer, L., Minier, V., Pracy, M. B., Purcell, C., Shobbrook, J., Travouillon, T.

“…We have used the Mopra Telescope to search for glycine and the simple chiral molecule propylene oxide in the Sgr B2 (LMH) and Orion KL, in the 3-mm band. We…”
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QSO photometric redshifts using machine learning and neural networks by Curran, S J, Moss, J P, Perrott, Y C

“…ABSTRACT The scientific value of the next generation of large continuum surveys would be greatly increased if the redshifts of the newly detected sources could…”
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