Correcting the Contamination of Second-order Spectra: Improving Hα Measurements in Reverberation Mapping Campaigns Article Swipe
Wen-Zhe Xi
,
Kai-Xing Lu
,
Hai-Cheng Feng
,
Shasha Li
,
Jin‐Ming Bai
,
Ruilei Zhou
,
H. T. Liu
,
Jian-Guo Wang
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1088/1674-4527/ad06f2
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1088/1674-4527/ad06f2
Long-term spectroscopic monitoring campaigns on active galactic nuclei (AGNs) provide a wealth of information about its interior structure and kinematics. However, a number of the observations suffer from the contamination of second-order spectra (SOS) which will introduce some undesirable uncertainties at the red side of the spectra. In this paper, we test the effect of SOS and propose a method to correct it in the time domain spectroscopic data using the simultaneously observed comparison stars. Based on the reverberation mapping (RM) data of NGC 5548 in 2019, one of the most intensively monitored AGNs by the Lijiang 2.4 m telescope, we find that the scientific object, comparison star, and spectrophotometric standard star can jointly introduce up to ∼30% SOS for Grism 14. This irregular but smooth SOS significantly affects the flux density and profile of the emission line, while having little effect on the light curve. After applying our method to each spectrum, we find that the SOS can be corrected effectively. The deviation between corrected and intrinsic spectra is ∼2%, and the impact of SOS on time lag is very minor. This method makes it possible to obtain the H α RM measurements from archival data provided that the spectral shape of the AGN under investigation does not have a large change.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1088/1674-4527/ad06f2
- OA Status
- hybrid
- References
- 38
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4387933090
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- OpenAlex ID
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https://openalex.org/W4387933090Canonical identifier for this work in OpenAlex
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https://doi.org/10.1088/1674-4527/ad06f2Digital Object Identifier
- Title
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Correcting the Contamination of Second-order Spectra: Improving Hα Measurements in Reverberation Mapping CampaignsWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2023Year of publication
- Publication date
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2023-10-25Full publication date if available
- Authors
-
Wen-Zhe Xi, Kai-Xing Lu, Hai-Cheng Feng, Shasha Li, Jin‐Ming Bai, Ruilei Zhou, H. T. Liu, Jian-Guo WangList of authors in order
- Landing page
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https://doi.org/10.1088/1674-4527/ad06f2Publisher landing page
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YesWhether a free full text is available
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hybridOpen access status per OpenAlex
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https://doi.org/10.1088/1674-4527/ad06f2Direct OA link when available
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Reverberation mapping, Active galactic nucleus, Physics, Spectral line, Astrophysics, Light curve, Line (geometry), Flux (metallurgy), Emission spectrum, Standard deviation, Galaxy, Astronomy, Geometry, Mathematics, Statistics, Chemistry, Organic chemistryTop concepts (fields/topics) attached by OpenAlex
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0Total citation count in OpenAlex
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38Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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