LAMOST Medium-Resolution Spectral Survey of Galactic Nebulae (LAMOST-MRS-N): Subtraction of Geocoronal Halpha Emission
We introduce a method of subtracting geocoronal Halpha emissions from the spectra of LAMOST medium-resolution spectral survey of Galactic nebulae (LAMOST-MRS-N). The flux ratios of the Halpha sky line to the adjacent OH lambda6554 single line do not show a pattern or gradient distribution in a plate...
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| creator | Zhang, Wei Wu, Hong Wu, Chaojian Ren, Juanjuan Chen, Jianjun Chih-Hao Hsia Wu, Yuzhong Zhu, Hui Shi, Jianrong Bai, Zhongrui Qi, Zhaoxiang Zhao, Yongheng Hou, Yonghui |
| description | We introduce a method of subtracting geocoronal Halpha emissions from the spectra of LAMOST medium-resolution spectral survey of Galactic nebulae (LAMOST-MRS-N). The flux ratios of the Halpha sky line to the adjacent OH lambda6554 single line do not show a pattern or gradient distribution in a plate. More interestingly, the ratio is well correlated to solar altitude, which is the angle of the sun relative to the Earth's horizon. It is found that the ratio decreases from 0.8 to 0.2 with the decreasing solar altitude from -17 to -73 degree. Based on this relation, which is described by a linear function, we can construct the Halpha sky component and subtract it from the science spectrum. This method has been applied to the LAMOST-MRS-N data, and the contamination level of the Halpha sky to nebula is reduced from 40% to less than 10%. The new generated spectra will significantly improve the accuracy of the classifications and the measurements of physical parameters of Galactic nebulae. |
| doi_str_mv | 10.48550/arxiv.2108.08021 |
| format | Article |
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The flux ratios of the Halpha sky line to the adjacent OH lambda6554 single line do not show a pattern or gradient distribution in a plate. More interestingly, the ratio is well correlated to solar altitude, which is the angle of the sun relative to the Earth's horizon. It is found that the ratio decreases from 0.8 to 0.2 with the decreasing solar altitude from -17 to -73 degree. Based on this relation, which is described by a linear function, we can construct the Halpha sky component and subtract it from the science spectrum. This method has been applied to the LAMOST-MRS-N data, and the contamination level of the Halpha sky to nebula is reduced from 40% to less than 10%. The new generated spectra will significantly improve the accuracy of the classifications and the measurements of physical parameters of Galactic nebulae.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.2108.08021</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Altitude ; Linear functions ; Nebulae ; Physical properties ; Physics - Astrophysics of Galaxies ; Physics - Instrumentation and Methods for Astrophysics ; Physics - Solar and Stellar Astrophysics ; Sky surveys (astronomy) ; Spectra ; Subtraction</subject><ispartof>arXiv.org, 2021-08</ispartof><rights>2021. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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The flux ratios of the Halpha sky line to the adjacent OH lambda6554 single line do not show a pattern or gradient distribution in a plate. More interestingly, the ratio is well correlated to solar altitude, which is the angle of the sun relative to the Earth's horizon. It is found that the ratio decreases from 0.8 to 0.2 with the decreasing solar altitude from -17 to -73 degree. Based on this relation, which is described by a linear function, we can construct the Halpha sky component and subtract it from the science spectrum. This method has been applied to the LAMOST-MRS-N data, and the contamination level of the Halpha sky to nebula is reduced from 40% to less than 10%. The new generated spectra will significantly improve the accuracy of the classifications and the measurements of physical parameters of Galactic nebulae.</description><subject>Altitude</subject><subject>Linear functions</subject><subject>Nebulae</subject><subject>Physical properties</subject><subject>Physics - Astrophysics of Galaxies</subject><subject>Physics - Instrumentation and Methods for Astrophysics</subject><subject>Physics - Solar and Stellar Astrophysics</subject><subject>Sky surveys (astronomy)</subject><subject>Spectra</subject><subject>Subtraction</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GOX</sourceid><recordid>eNotkEtrwkAUhYdCoWL9AV11oJt2MXbeid2JWC34AOM-zMQbGolOOpNI_fcdtau7uN93OByEnhgdylQp-m78b3UackbTIU0pZ3eox4VgJJWcP6BBCHtKKdcJV0r00GkxXq6zLV7CruoOZAPB1V1buSPOGihab2qcdf4EZ-xKPDO1KdqqwCuwXW0Av95sstxkZPX2EVEbleLqX3hwhfPuGEPmpm6-DZ4eqhDi9xHdl6YOMPi_fbT9nG4nc7JYz74m4wUximsCpR4lSWmlSq22ksfeFiwbMVUa4GWhUgFFIpOd5CAUUwnQkbISKEt0ybgWffR8i72Okje-Ohh_zi_j5NdxIvFyIxrvfjoIbb53nY-NQ86V5loxqrT4A_1kZe0</recordid><startdate>20210818</startdate><enddate>20210818</enddate><creator>Zhang, Wei</creator><creator>Wu, Hong</creator><creator>Wu, Chaojian</creator><creator>Ren, Juanjuan</creator><creator>Chen, Jianjun</creator><creator>Chih-Hao Hsia</creator><creator>Wu, Yuzhong</creator><creator>Zhu, Hui</creator><creator>Shi, Jianrong</creator><creator>Bai, Zhongrui</creator><creator>Qi, Zhaoxiang</creator><creator>Zhao, Yongheng</creator><creator>Hou, Yonghui</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20210818</creationdate><title>LAMOST Medium-Resolution Spectral Survey of Galactic Nebulae (LAMOST-MRS-N): Subtraction of Geocoronal Halpha Emission</title><author>Zhang, Wei ; Wu, Hong ; Wu, Chaojian ; Ren, Juanjuan ; Chen, Jianjun ; Chih-Hao Hsia ; Wu, Yuzhong ; Zhu, Hui ; Shi, Jianrong ; Bai, Zhongrui ; Qi, Zhaoxiang ; Zhao, Yongheng ; Hou, Yonghui</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a526-ef6977fb458b6b42002beb1915fae2fc583ec747d42e35157e095b4e0176f1263</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Altitude</topic><topic>Linear functions</topic><topic>Nebulae</topic><topic>Physical properties</topic><topic>Physics - Astrophysics of Galaxies</topic><topic>Physics - Instrumentation and Methods for Astrophysics</topic><topic>Physics - Solar and Stellar Astrophysics</topic><topic>Sky surveys (astronomy)</topic><topic>Spectra</topic><topic>Subtraction</topic><toplevel>online_resources</toplevel><creatorcontrib>Zhang, Wei</creatorcontrib><creatorcontrib>Wu, Hong</creatorcontrib><creatorcontrib>Wu, Chaojian</creatorcontrib><creatorcontrib>Ren, Juanjuan</creatorcontrib><creatorcontrib>Chen, Jianjun</creatorcontrib><creatorcontrib>Chih-Hao Hsia</creatorcontrib><creatorcontrib>Wu, Yuzhong</creatorcontrib><creatorcontrib>Zhu, Hui</creatorcontrib><creatorcontrib>Shi, Jianrong</creatorcontrib><creatorcontrib>Bai, Zhongrui</creatorcontrib><creatorcontrib>Qi, Zhaoxiang</creatorcontrib><creatorcontrib>Zhao, Yongheng</creatorcontrib><creatorcontrib>Hou, Yonghui</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhang, Wei</au><au>Wu, Hong</au><au>Wu, Chaojian</au><au>Ren, Juanjuan</au><au>Chen, Jianjun</au><au>Chih-Hao Hsia</au><au>Wu, Yuzhong</au><au>Zhu, Hui</au><au>Shi, Jianrong</au><au>Bai, Zhongrui</au><au>Qi, Zhaoxiang</au><au>Zhao, Yongheng</au><au>Hou, Yonghui</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>LAMOST Medium-Resolution Spectral Survey of Galactic Nebulae (LAMOST-MRS-N): Subtraction of Geocoronal Halpha Emission</atitle><jtitle>arXiv.org</jtitle><date>2021-08-18</date><risdate>2021</risdate><eissn>2331-8422</eissn><abstract>We introduce a method of subtracting geocoronal Halpha emissions from the spectra of LAMOST medium-resolution spectral survey of Galactic nebulae (LAMOST-MRS-N). The flux ratios of the Halpha sky line to the adjacent OH lambda6554 single line do not show a pattern or gradient distribution in a plate. More interestingly, the ratio is well correlated to solar altitude, which is the angle of the sun relative to the Earth's horizon. It is found that the ratio decreases from 0.8 to 0.2 with the decreasing solar altitude from -17 to -73 degree. Based on this relation, which is described by a linear function, we can construct the Halpha sky component and subtract it from the science spectrum. This method has been applied to the LAMOST-MRS-N data, and the contamination level of the Halpha sky to nebula is reduced from 40% to less than 10%. The new generated spectra will significantly improve the accuracy of the classifications and the measurements of physical parameters of Galactic nebulae.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.2108.08021</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Altitude Linear functions Nebulae Physical properties Physics - Astrophysics of Galaxies Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics Sky surveys (astronomy) Spectra Subtraction |
| title | LAMOST Medium-Resolution Spectral Survey of Galactic Nebulae (LAMOST-MRS-N): Subtraction of Geocoronal Halpha Emission |
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