Investigating the Anticorrelation between Photon Index and Flux of the Crab Using RXTE and NuSTAR Article Swipe

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Debjit Chatterjee , Hsiang‐Kuang Chang , Dipak Debnath , Koothodil Abhijith Augustine , Tzu-Hsuan Lin ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.3847/1538-4357/ade9bd

We present a systematic study of the recently reported anticorrelation between X-ray flux and photon index (Γ) in the Crab Nebula, using archival Rossi X-Ray Timing Explorer (RXTE) Proportional Counter Array (3–50 keV), RXTE High Energy X-ray Timing Experiment (HEXTE; 20–100 keV), and Nuclear Spectroscopic Telescope Array (3–78 keV) observations. Spectra were extracted in soft (3–10 keV) and hard bands (10–50, 10–78, 20–100 keV) and fitted with an absorbed power-law model. Across all instruments and energy ranges, we confirm the existence of a persistent negative correlation–harder spectra at higher flux levels. The correlation is stronger in the hard bands compared to the soft bands. This is consistent with synchrotron emission modulated by magnetic-field variations in the pulsar wind nebula.

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Physics Crab Nebula Astrophysics Flux (metallurgy) Pulsar Photon Spectral line Telescope Nebula Crab Pulsar Proportional counter Synchrotron Astronomy Detector Stars Nuclear physics Optics Materials science Metallurgy

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Type: article
Language: en
Landing Page: https://doi.org/10.3847/1538-4357/ade9bd
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References: 44
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DOI: https://doi.org/10.3847/1538-4357/ade9bd

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Title: Investigating the Anticorrelation between Photon Index and Flux of the Crab Using RXTE and NuSTAR

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Language: en

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Publication year: 2025

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Publication date: 2025-07-17

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Authors: Debjit Chatterjee, Hsiang‐Kuang Chang, Dipak Debnath, Koothodil Abhijith Augustine, Tzu-Hsuan Lin

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Landing page: https://doi.org/10.3847/1538-4357/ade9bd

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Concepts: Physics, Crab Nebula, Astrophysics, Flux (metallurgy), Pulsar, Photon, Spectral line, Telescope, Nebula, Crab Pulsar, Proportional counter, Synchrotron, Astronomy, Detector, Stars, Nuclear physics, Optics, Materials science, Metallurgy

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abstract_inverted_index.fitted	66
abstract_inverted_index.higher	89
abstract_inverted_index.model.	71
abstract_inverted_index.photon	15
abstract_inverted_index.pulsar	117
abstract_inverted_index.(3–10	56
abstract_inverted_index.(3–50	32
abstract_inverted_index.(3–78	48
abstract_inverted_index.(HEXTE;	40
abstract_inverted_index.Counter	30
abstract_inverted_index.Nebula,	21
abstract_inverted_index.Nuclear	44
abstract_inverted_index.Spectra	51
abstract_inverted_index.between	11
abstract_inverted_index.confirm	79
abstract_inverted_index.levels.	91
abstract_inverted_index.nebula.	119
abstract_inverted_index.present	2
abstract_inverted_index.ranges,	77
abstract_inverted_index.spectra	87
abstract_inverted_index.10–78,	62
abstract_inverted_index.20–100	41, 63
abstract_inverted_index.Abstract	0
abstract_inverted_index.Explorer	27
abstract_inverted_index.absorbed	69
abstract_inverted_index.archival	23
abstract_inverted_index.compared	100
abstract_inverted_index.emission	110
abstract_inverted_index.negative	85
abstract_inverted_index.recently	8
abstract_inverted_index.reported	9
abstract_inverted_index.stronger	95
abstract_inverted_index.(10–50,	61
abstract_inverted_index.Telescope	46
abstract_inverted_index.existence	81
abstract_inverted_index.extracted	53
abstract_inverted_index.modulated	111
abstract_inverted_index.power-law	70
abstract_inverted_index.Experiment	39
abstract_inverted_index.consistent	107
abstract_inverted_index.persistent	84
abstract_inverted_index.systematic	4
abstract_inverted_index.variations	114
abstract_inverted_index.correlation	93
abstract_inverted_index.instruments	74
abstract_inverted_index.synchrotron	109
abstract_inverted_index.Proportional	29
abstract_inverted_index.Spectroscopic	45
abstract_inverted_index.observations.	50
abstract_inverted_index.magnetic-field	113
abstract_inverted_index.anticorrelation	10
abstract_inverted_index.correlation–harder	86
cited_by_percentile_year
countries_distinct_count	0
institutions_distinct_count	5
sustainable_development_goals[0].id	https://metadata.un.org/sdg/7
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