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14 results on '"Martin-Carrillo A"'

3. Optical Spectropolarimetry Observations of the BL Lac-type object PKS 0537-441 after a period of quiescence

Author

Barnard, Joleen, primary, van Soelen, Brian, additional, Cooper, Justin, additional, Britto, Richard, additional, Marais, Johannes Petrus, additional, van der Westhuizen, Izak, additional, Buckley, David, additional, Schutte, Hester, additional, Böttcher, Markus, additional, Vaidya, Bhargav, additional, Achariya, Sriyasriti, additional, and Martin-Carrillo, Antonio, additional

Published
2021
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4. Transient emission of selected CRTS Cataclysmic Variables

Author

Pieter Meintjes, Johannes Petrus Marais, A. Odendaal, R. J. Britto, Brian van Soelen, David Murphy, Miriam M Nyamai, Mokhine Motsoaledi, Helene Szegedi, Andry Rajoelimanana, Antonio Martin-Carrillo, John R. Thorstensen, and Lorraine Hanlon

Subjects
Physics, Absorption spectroscopy, Accretion disc, Magnitude (astronomy), Emission spectrum, Astrophysics, Mass ratio, Light curve, Spectral line, Optical spectra
Abstract

We present optical photometric and spectroscopic observations of three SU UMa-type dwarf novae, i.e. AR Pic, QW Ser and V521 Peg, conducted in 2016 and 2017. These sources were selected from the Catalina Real-Time Transient Survey and observed during quiescence, outburst (AR Pic and QW Ser) and superoutburst (V521 Peg). For AR Pic, strong flickering in the light curves and an asymmetric double-peaked H$\beta$ emission line in the spectra, confirmed the presence of a very active hot spot. During outburst, detected on 18 February 2017, it exhibited a $\sim 3.3$ magnitude brightening. The projected velocity of the inner edge of the accretion disc is $\sim 2000 \rm~km~s^{-1}$. An outburst of QW Ser was detected on 8 August 2016. Absorption lines, characteristic of an optically thick disc during outburst, were detected and an outflow velocity of $\sim 1000 \rm ~km~s^{-1}$ was determined. Optical spectra during the superoutburst of V521 Peg were obtained for the first time, confirming the superoutburst nature of the outburst, as also observed in other SU UMa-type dwarf novae. The superoutburst was detected on 1 September 2017. Well-defined superhumps were observed, with an average superhump period of $P_{\rm sh} \sim 1.48$ hr. A mass ratio of $q \sim 0.14$ was determined from the period excess of $\varepsilon \sim 3 \%$.

Published
2018
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5. INTEGRAL Observations of Gravitational-Wave Counterparts & Future Perspectives: Searching for GBM Un-Triggered SGRB with PICsIT

Author

Rodi, James, primary, Bazzano, Angela, additional, Natalucci, Lorenzo, additional, Ubertini, Pietro, additional, Mereghetti, Sadro, additional, Bozzo, Enrico, additional, Ferrigno, Carlo, additional, Savchenko, Volodymyr, additional, Courvoisier, Thierry J.-L., additional, Kuulkers, Erik, additional, Brandt, S., additional, Chenevez, Jerome, additional, Diehl, Rod, additional, Kienlin, A. Von, additional, Hanlon, Lorraine, additional, Martin-Carrillo, Antonio, additional, Jourdain, E., additional, Roques, J.-P., additional, Laurent, Philippe, additional, Lebrun, Flebrun, additional, Lutovinov, A., additional, and Sunyaev, R., additional

Published
2018
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6. Transient emission of selected CRTS Cataclysmic Variables

Author

Szegedi, Helene, primary, Odendaal, Alida, additional, Meintjes, Pieter, additional, van Soelen, Brian, additional, Marais, Johannes Petrus, additional, Rajoelimanana, Andry, additional, Nyamai, Miriam M, additional, Britto, Richard, additional, Hanlon, Lorraine, additional, Murphy, David, additional, Martin-Carrillo, Antonio, additional, Motsoaledi, Mokhine, additional, and Thorstensen, John R, additional

Published
2018
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7. Temporal properties of Swift GRBs with known redshifts

Author

Lorraine Hanlon, B. McBreen, Roger Edwin O'Connor, Antonio Martin-Carrillo, Sheila McBreen, and Suzanne Foley

Subjects
Physics, Swift, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Redshift, Pulse (physics), Wavelet, Amplitude, Log-normal distribution, Frequency distribution, Gamma-ray burst, computer, computer.programming_language
Abstract

The Swift Gamma Ray Burst (GRB) mission has enabled the rapid detection of GRBs and the determination of the redshift of a greater proportion of source counterparts than previous missions. The mean redshift of the Swift GRBs is significantly higher than that of earlier missions. We present the results of a temporal analysis performed on 134 Swift long GRBs with known redshift. ‡ The GRBs were denoised using wavelets and subjected to an automatic pulse selection algorithm with the objective of identifying pulses. The rise times, fall times, full-width at half-maxima (FWHM), pulse amplitudes and pulse areas were measured and the frequency distributions of some of them are presented here. The results provide a comprehensive description of the pulse profiles in Swift GRBs with known redshift, determining that the temporal properties are consistent with lognormal distributions and that correcting for the known redshift of the source does not have a significant impact on the distributions. Lognormal distributions arise from random multiplicative processes and abound in a variety of natural phenomena.

Published
2011
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