Search Results - "Filiz Ak, N."

Broad absorption line disappearance and emergence using multiple-epoch spectroscopy from the Sloan Digital Sky Survey by McGraw, S. M., Brandt, W. N., Grier, C. J., Filiz Ak, N., Hall, P. B., Schneider, D. P., Anderson, S. F., Green, P. J., Hutchinson, T. A., Macleod, C. L., Vivek, M.

“…Abstract We investigate broad absorption line (BAL) disappearance and emergence using a 470 BAL-quasar sample over ≤0.10–5.25 rest-frame years with at least…”
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Emergence and Variability of Broad Absorption Line Quasar Outflows by Rogerson, J. A., Hall, P. B., Ahmed, N. S., Hidalgo, P. Rodríguez, Brandt, W. N., Ak, N. Filiz

“…We isolate a set of quasars that exhibit emergent C iv broad absorption lines (BALs) in their spectra by comparing spectra in the Sloan Digital Sky Survey…”
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C IV BROAD ABSORPTION LINE ACCELERATION IN SLOAN DIGITAL SKY SURVEY QUASARS by Grier, C. J., Brandt, W. N., Hall, P. B., Trump, J. R., Filiz Ak, N., Anderson, S. F., Green, Paul J., Schneider, D. P., Sun, M., Vivek, M., Beatty, T. G., Brownstein, Joel R., Roman-Lopes, Alexandre

“…ABSTRACT We present results from the largest systematic investigation of broad absorption line (BAL) acceleration to date. We use spectra of 140 quasars from…”
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THE DEPENDENCE OF C IV BROAD ABSORPTION LINE PROPERTIES ON ACCOMPANYING Si IV AND Al III ABSORPTION: RELATING QUASAR-WIND IONIZATION LEVELS, KINEMATICS, AND COLUMN DENSITIES by Ak, N Filiz, Brandt, W N, Hall, P B, Schneider, D P, Trump, J R, Anderson, S F, Hamann, F, Myers, Adam D, Paris, I, Petitjean, P, Ross, Nicholas P, Shen, Yue, York, Don

“…We consider how the profile and multi-year variability properties of a large sample of C IV Broad Absorption Line (BAL) troughs change when BALs from Si IV…”
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X-ray and multi-epoch optical/UV investigations of BAL to non-BAL quasar transformations by Sameer, Brandt, W N, Anderson, S, Hall, P B, Vivek, M, Filiz Ak, N, Grier, C J, Ahmed, N S, Luo, B, Myers, A D, Rodríguez Hidalgo, P, Ruan, J, Schneider, D P

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Broad absorption line quasars with redshifted troughs: high-velocity infall or rotationally dominated outflows? by Hall, P. B., Brandt, W. N., Petitjean, P., Pâris, I., Filiz Ak, N., Shen, Yue, Gibson, R. R., Aubourg, É., Anderson, S. F., Schneider, D. P., Bizyaev, D., Brinkmann, J., Malanushenko, E., Malanushenko, V., Myers, A. D., Oravetz, D. J., Ross, N. P., Shelden, A., Simmons, A. E., Streblyanska, A., Weaver, B. A., York, D. G.

“…We report the discovery in the Sloan Digital Sky Survey (SDSS) and the SDSS-III Baryon Oscillation Spectroscopic Survey of 17 broad absorption line (BAL)…”
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BROAD ABSORPTION LINE VARIABILITY ON MULTI-YEAR TIMESCALES IN A LARGE QUASAR SAMPLE by Ak, N Filiz, Brandt, W N, Hall, P B, Schneider, D P, Anderson, S F, Hamann, F, Lundgren, B F, Myers, Adam D, Paris, I, Petitjean, P, Ross, Nicholas P, Shen, Yue, York, Don

“…We present a detailed investigation of the variability of 428 C IV and 235 Si IV broad absorption line (BAL) troughs identified in multi-epoch observations of…”
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A catalogue of chromospherically active binary stars (third edition) by Eker, Z., Ak, N. Filiz, Bilir, S., Doğru, D., Tüysüz, M., Soydugan, E., Bakış, H., Uğraş, B., Soydugan, F., Erdem, A., Demircan, O.

“…The catalogue of chromospherically active binaries (CABs) has been revised and updated. With 203 new identifications, the number of CAB stars is increased to…”
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Orbits of six late-type active-chromosphere binaries by Griffin, R. F., Filiz Ak, N.

“…We present spectroscopic orbits for the active stars HD 82159 (GS Leo), HD 89959, BD +39° 2587 (a visual companion to HD 112733), HD 138157 (OX Ser), HD…”
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X-Ray Insights into the Nature of Quasars with Redshifted Broad Absorption Lines by Zhang, Ning-Xiao, Brandt, W. N., Ahmed, N. S., Hall, P. B., Luo, B., Anderson, Scott F., Ak, N. Filiz, Petitjean, P., Schneider, D. P., Shen, Yue, Srianand, R.

“…We present Chandra observations of seven broad absorption line (BAL) quasars at with redshifted BAL troughs (RSBALs). Five of our seven targets were detected…”
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BROAD ABSORPTION LINE DISAPPEARANCE ON MULTI-YEAR TIMESCALES IN A LARGE QUASAR SAMPLE by Filiz Ak, N., Brandt, W. N., Hall, P. B., Schneider, D. P., Anderson, S. F., Gibson, R. R., Lundgren, B. F., Myers, A. D., Petitjean, P., Ross, Nicholas P., Shen, Yue, York, D. G., Bizyaev, D., Brinkmann, J., Malanushenko, E., Oravetz, D. J., Pan, K., Simmons, A. E., Weaver, B. A.

“…We present 21 examples of C IV broad absorption line (BAL) trough disappearance in 19 quasars selected from systematic multi-epoch observations of 582 bright…”
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New absolute magnitude calibrations for detached binaries by Bilir, S., Ak, T., Soydugan, E., Soydugan, F., Yaz, E., Filiz Ak, N., Eker, Z., Demircan, O., Helvacı, M.

“…Lutz‐Kelker bias corrected absolute magnitude calibrations for the detached binary systems with main‐sequence components are presented. The absolute magnitudes…”
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Variability of Low-ionization Broad Absorption Line Quasars Based on Multi-epoch Spectra from The Sloan Digital Sky Survey by Yi, Weimin, Brandt, W. N, Hall, P. B, Vivek, M, Grier, C. J, Ak, N. Filiz, Schneider, D. P, McGraw, S. M

“…We present absorption variability results for 134 bona fide \mgii\ broad absorption line (BAL) quasars at 0.46~$\lesssim z \lesssim$~2.3 covering days to…”
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THE SLOAN DIGITAL SKY SURVEY REVERBERATION MAPPING PROJECT: RAPID C iv BROAD ABSORPTION LINE VARIABILITY by Grier, C. J., Hall, P. B., Brandt, W. N., Trump, J. R., Shen, Yue, Vivek, M., Ak, N. Filiz, Chen, Yuguang, Dawson, K. S., Denney, K. D., Green, Paul J., Jiang, Linhua, Kochanek, C. S., McGreer, Ian D., Pâris, I., Peterson, B. M., Schneider, D. P., Tao, Charling, Wood-Vasey, W. M., Bizyaev, Dmitry, Ge, Jian, Kinemuchi, Karen, Oravetz, Daniel, Pan, Kaike, Simmons, Audrey

“…ABSTRACT We report the discovery of rapid variations of a high-velocity C iv broad absorption line trough in the quasar SDSS J141007.74+541203.3. This object…”
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C IV BAL disappearance in a large SDSS QSO sample by De Cicco, D, Brandt, W. N, Grier, C. J, Paolillo, M, Ak, N. Filiz, Schneider, D. P, Trump, J. R

“…A&A 616, A114 (2018) Broad absorption lines (BALs) in the spectra of quasi-stellar objects (QSOs) originate from outflowing winds along our line of sight;…”
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Broad absorption line disappearance/emergence in multiple ions in a weak emission-line quasar by Yi, Weimin, Vivek, M, Brandt, W. N, Wang, T, Timlin, J, Ak, N. Filiz, Schneider, D. P, Fynbo, J. P. U, Ni, Q, Vito, F, Indahl, B. L, Sameer

“…We report the discovery of disappearance of Mg ii, Al iii, C iv, and Si iv broad absorption lines (BALs) at the same velocity, accompanied by a new Civ BAL…”
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X-ray and multi-epoch optical/UV investigations of BAL to non-BAL quasar transformations by Sameer, Brandt, W. N, Anderson, S, Hall, P. B, Vivek, M, Ak, N. Filiz, Grier, C. J, Ahmed, N. S, Luo, B, Myers, A. D, Hidalgo, P. Rodríguez, Ruan, J, Schneider, D. P

“…We report on an X-ray and optical/UV study of eight Broad Absorption Line (BAL) to non-BAL transforming quasars at $z\,\approx\,$1.7-2.2 over 0.29-4.95…”
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Broad absorption line disappearance and emergence using multiple-epoch spectroscopy from the Sloan Digital Sky Survey by McGraw, S. M, Brandt, W. N, Grier, C. J, Ak, N. Filiz, Hall, P. B, Schneider, D. P, Anderson, S. F, Green, P. J, Hutchinson, T. A, Macleod, C. L, Vivek, M

“…We investigate broad absorption line (BAL) disappearance and emergence using a 470 BAL-quasar sample over < 0.10-5.25 rest-frame years with at least three…”
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X-ray Insights into the Nature of Quasars with Redshifted Broad Absorption Lines by Zhang, Ning-Xiao, Brandt, W. N, Ahmed, N. S, Hall, P. B, Luo, B, Anderson, Scott F, Ak, N. Filiz, Petitjean, P, Schneider, D. P, Shen, Yue, Srianand, R

“…We present $Chandra$ observations of seven broad absorption line (BAL) quasars at $z=0.863$-2.516 with redshifted BAL troughs (RSBALs). Five of our seven…”
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CIV Broad Absorption Line Acceleration in Sloan Digital Sky Survey Quasars by Grier, C. J, Brandt, W. N, Hall, P. B, Trump, J. R, Ak, N. Filiz, Anderson, S. F, Green, Paul J, Schneider, D. P, Sun, M, Vivek, M, Beatty, T. G, Brownstein, Joel R, Roman-Lopes, Alexandre

“…We present results from the largest systematic investigation of broad absorption line (BAL) acceleration to date. We use spectra of 140 quasars from three…”
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