Publication Information

{'id': 'https://openalex.org/W2094119619', 'doi': 'https://doi.org/10.1086/169540', 'title': 'Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. I - an 8 month campaign of monitoring NGC 5548 with IUE', 'display_name': 'Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 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[147], 'Korista,': [150], 'Laor,': [154], 'Lasota,': [157], '-P.': [159], 'Leibowitz,': [161], 'Maoz,': [164], 'Martin,': [167], 'Mazeh,': [171], 'Meurs,': [174], 'Nair,': [179], "O'Brien,": [183], 'Pelat,': [186], 'Perez,': [189], 'Perola,': [192], 'Ptak,': [196], 'Rodriguez-Pascual,': [200], 'Rosenblatt,': [203], 'Sadun,': [207], 'Santos-Lleo,': [211], 'Shaw,': [214], '7': [218], 'more': [219], 'We': [221], 'present': [222], 'emission-line': [223, 413], 'ultraviolet': [225, 289], 'continuum': [226, 290, 320, 326, 424, 444], 'observations': [227], 'a': [229, 262, 430, 455], 'type': [230, 276], 'I': [231, 277], 'Seyfert': [232, 278, 568], 'galaxy': [233], 'which': [235], 'time': [237], 'resolution': [238], 'is': [239, 427, 445, 530, 538], 'adequate': [240], 'for': [241, 261, 275, 318, 429, 447], 'describing': [242], 'character': [244], 'variability.': [246], 'Using': [247], 'satellite,': [250], 'nucleus': [252], 'was': [256, 282, 315, 327, 332], 'observed': [257], 'every': [258], '4': [259], 'days': [260], 'period': [263], 'months.': [266], 'Its': [267], 'mean': [268], 'properties-continuum': [269], 'shape,': [270], 'line': [271, 295, 457, 511], 'ratios-are': [272], 'not': [273, 539], 'unusual': [274], 'galaxies,': [279], 'but': [280], 'it': [281, 331], 'found': [283], 'to': [284, 312, 436, 459], 'be': [285], 'strongly': [286], 'variable.': [287], 'The': [288, 308, 334, 396, 452, 469, 498, 548], 'flux': [291, 314, 353], 'broad': [293, 531], 'emission': [294, 337, 450], 'fluxes': [296], 'varied': [297], 'significantly,': [298], 'going': [299], 'through': [300], 'three': [301, 305], 'large': [302], 'maxima': [303], 'deep': [306], 'minima.': [307], 'ratio': [309], 'maximum': [311], 'minimum': [313], '~': [316, 379, 394, 483, 544], '4.5': [317], 'at': [321], '1350': [322, 422], 'A,': [323], 'significantly': [328, 513], 'bluer': [329], 'when': [330], 'brighter.': [333], 'high': [335, 356], 'ionization': [336, 387, 465], 'lines': [338, 494], 'showed': [339], 'strongest': [341], 'variations,': [342], 'N': [344, 474], 'V': [345, 475], 'λ1240': [346, 476], 'He': [348, 470], 'II': [349, 383, 410, 471, 526], 'λ1640': [350, 472], 'exhibiting': [351], 'maximum-to-minimum': [352], 'ratios': [354], 'as': [355, 357], 'those': [358, 419], 'continuum.': [361], 'Intermediate-ionization': [362], 'lines,': [363], 'including': [364], 'Lyα': [365, 488], 'λ1216,': [366], 'C': [367, 371, 491, 508], 'IV': [368, 492, 500], 'λ1549,': [369], 'II]': [372], 'λ1909,': [373], 'had': [374], 'maximum-': [375], 'to-minimum': [376], 'amplitudes': [377], '2,': [380], 'Mg': [382, 409, 525], 'λ2798,': [384, 411, 527], 'lowest': [386], 'line,': [388], 'exhibited': [389], 'smallest': [391], 'amplitude': [392], 'fluctuations,': [393], '1.3.': [395], 'great': [397], 'majority': [398], 'all': [400], 'variations': [401, 414], 'were': [402], 'well': [403, 417], 'resolved': [404], 'time.': [406], 'Apart': [407], 'from': [408], 'correlate': [415], 'extremely': [416], 'A': [423], 'if': [425], 'allowance': [426], 'made': [428], 'systematic': [431], 'delay,': [432], 'lending': [433], 'qualitative': [434], 'support': [435], 'that': [439, 535], 'photoionization': [440], 'by': [441], 'nuclear': [443], 'responsible': [446], 'driving': [448], 'lines.': [451], 'delay': [453, 537], 'given': [456], 'seems': [458], 'depend': [460], 'on': [461], 'degree': [463], 'its': [467], 'species.': [468], 'features': [477], 'exhibit': [478, 512], 'shortest': [480], 'delay.': [481], '{DELTA}t': [482, 543], '4-10': [484], 'days,': [485], 'while': [486], 'λ1216': [489], 'λ1549': [493], 'yield': [495], '8-16': [496], 'days.': [497, 520, 546], 'Si': [499], '+': [501], 'O': [502], 'IV]': [503], 'λ1402': [504], 'feature': [505], 'III]': [509], 'λ1909': [510], 'larger': [514], 'delays,': [515], 'between': [516], '12': [517], '34': [519], 'In': [521], 'case': [523], 'cross-correlation': [529], 'shallow,': [533], 'so': [534], 'only': [540], 'loosely': [541], 'constrained.': [542], '34-72': [545], 'Publication:': [547], 'Astrophysical': [549], 'Journal': [550], 'Pub': [551], 'Date:': [552], 'January': [553], '1991': [554], 'DOI:': [555], '10.1086/169540': [556], 'Bibcode:': [557], '1991ApJ...366...64C': [558], 'Keywords:': [559], 'Nuclei;': [562], 'Astronomical': [563], 'Spectroscopy;': [564], 'Structure;': [566], 'Iue;': [567], 'Galaxies;': [569], 'Emission': [570], 'Spectra;': [571, 576], 'Time': [572], 'Series': [573], 'Analysis;': [574], 'Ultraviolet': [575], 'Variability;': [577], 'Astrophysics;': [578], 'GALAXIES:': [579, 585, 587], 'INDIVIDUAL': [580], 'NUMBER:': [582], '5548;': [584], 'NUCLEI;': [586], 'SEYFERT;': [588], 'ULTRAVIOLET:': [589], 'SPECTRA': [590], 'full': [591], 'text': [592], 'sources': [593], 'ADS': [594], '|': [595], 'data': [596], 'products': [597], 'SIMBAD': [598], '(1)': [599, 601, 603, 605], 'NED': [600], 'MAST': [602], 'INES': [604], 'Related': [606], 'Materials': [607], '(14)': [608], 'Part': [609, 612, 615, 618, 621, 624, 627, 630, 633, 636, 639, 642, 645, 648], '2:': [610], '1991ApJ...368..119P': [611], '3:': [613], '1992ApJ...392..470P': [614], '4:': [616], '1993ApJ...408..416D': [617], '5:': [619], '1994ApJ...425..582R': [620], '6:': [622], '1994ApJ...425..609S': [623], '7:': [625], '1994ApJ...425..622P': [626], '8:': [628], '1995ApJS...97..285K': [629], '9:': [631], '1997ApJS..110....9R': [632], '10:': [634], '1997ApJS..112..271S': [635], '11:': [637], '1997ApJS..113...69W': [638], '12:': [640], '1998ApJS..115..185D': [641], '13:': [643], '1998ApJ...509..163O': [644], '14:': [646], '1998ApJ...500..162C': [647], '15:': [649], '1999ApJ...510..659P': [650]}, 'abstract_inverted_index_v3': None, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2094119619', 'counts_by_year': [{'year': 2024, 'cited_by_count': 7}, {'year': 2023, 'cited_by_count': 9}, {'year': 2022, 'cited_by_count': 10}, {'year': 2021, 'cited_by_count': 7}, {'year': 2020, 'cited_by_count': 14}, {'year': 2019, 'cited_by_count': 9}, {'year': 2018, 'cited_by_count': 13}, {'year': 2017, 'cited_by_count': 9}, {'year': 2016, 'cited_by_count': 12}, {'year': 2015, 'cited_by_count': 9}, {'year': 2014, 'cited_by_count': 5}, {'year': 2013, 'cited_by_count': 16}, {'year': 2012, 'cited_by_count': 13}], 'updated_date': '2025-01-18T20:24:50.240810', 'created_date': '2016-06-24'}