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            <front>

                <journal-meta>
                                                                <journal-id>tjaa</journal-id>
            <journal-title-group>
                                                                                    <journal-title>Turkish Journal of Astronomy and Astrophysics</journal-title>
            </journal-title-group>
                                        <issn pub-type="epub">2757-7295</issn>
                                                                                            <publisher>
                    <publisher-name>Türk Astronomi Derneği</publisher-name>
                </publisher>
                    </journal-meta>
                <article-meta>
                                        <article-id pub-id-type="doi">10.55064/tjaa.1598141</article-id>
                                                                <article-categories>
                                            <subj-group  xml:lang="en">
                                                            <subject>Cosmology and Extragalactic Astronomy</subject>
                                                            <subject>High Energy Astrophysics and Galactic Cosmic Rays</subject>
                                                            <subject>Astronomical Sciences (Other)</subject>
                                                    </subj-group>
                                            <subj-group  xml:lang="tr">
                                                            <subject>Kozmoloji ve Samanyolu Ötesi Astronomi</subject>
                                                            <subject>Yüksek Enerji Astrofiziği ve Kozmik Işınlar</subject>
                                                            <subject>Astronomik Bilimler (Diğer)</subject>
                                                    </subj-group>
                                    </article-categories>
                                                                                                                                                        <title-group>
                                                                                                                        <article-title>NGC 5907&#039;deki Aşırı Parlak X-Işın Kaynağı APX1’in Tayfsal Analizi</article-title>
                                                                                                                                                                                                <trans-title-group xml:lang="en">
                                    <trans-title>Spectral Analysis of the Ultraluminous X-Ray Source ULX1 in NGC 5907</trans-title>
                                </trans-title-group>
                                                                                                    </title-group>
            
                                                    <contrib-group content-type="authors">
                                                                        <contrib contrib-type="author">
                                                                    <contrib-id contrib-id-type="orcid">
                                        https://orcid.org/0009-0003-8556-8251</contrib-id>
                                                                <name>
                                    <surname>Dilekçi</surname>
                                    <given-names>Ceyda</given-names>
                                </name>
                                                                    <aff>BOĞAZİÇİ ÜNİVERSİTESİ</aff>
                                                            </contrib>
                                                    <contrib contrib-type="author">
                                                                    <contrib-id contrib-id-type="orcid">
                                        https://orcid.org/0009-0005-3884-2785</contrib-id>
                                                                <name>
                                    <surname>Alkan</surname>
                                    <given-names>Bedirhan</given-names>
                                </name>
                                                                    <aff>BOĞAZİÇİ ÜNİVERSİTESİ</aff>
                                                            </contrib>
                                                    <contrib contrib-type="author">
                                                                    <contrib-id contrib-id-type="orcid">
                                        https://orcid.org/0000-0001-7991-1605</contrib-id>
                                                                <name>
                                    <surname>Kara</surname>
                                    <given-names>Sinancan</given-names>
                                </name>
                                                                    <aff>BOĞAZİÇİ ÜNİVERSİTESİ</aff>
                                                            </contrib>
                                                    <contrib contrib-type="author">
                                                                    <contrib-id contrib-id-type="orcid">
                                        https://orcid.org/0000-0003-1054-264X</contrib-id>
                                                                <name>
                                    <surname>Erkut</surname>
                                    <given-names>Mehmet Hakan</given-names>
                                </name>
                                                                    <aff>BOĞAZİÇİ ÜNİVERSİTESİ</aff>
                                                            </contrib>
                                                    <contrib contrib-type="author">
                                                                    <contrib-id contrib-id-type="orcid">
                                        https://orcid.org/0000-0003-0639-7048</contrib-id>
                                                                <name>
                                    <surname>Ercan</surname>
                                    <given-names>Enise Nihal</given-names>
                                </name>
                                                                    <aff>BOĞAZİÇİ ÜNİVERSİTESİ</aff>
                                                            </contrib>
                                                                                </contrib-group>
                        
                                        <pub-date pub-type="pub" iso-8601-date="20250701">
                    <day>07</day>
                    <month>01</month>
                    <year>2025</year>
                </pub-date>
                                        <volume>6</volume>
                                        <issue>Special Issue: UAK2024 Proc.</issue>
                                        <fpage>48</fpage>
                                        <lpage>53</lpage>
                        
                        <history>
                                    <date date-type="received" iso-8601-date="20241208">
                        <day>12</day>
                        <month>08</month>
                        <year>2024</year>
                    </date>
                                                    <date date-type="accepted" iso-8601-date="20250223">
                        <day>02</day>
                        <month>23</month>
                        <year>2025</year>
                    </date>
                            </history>
                                        <permissions>
                    <copyright-statement>Copyright © 2020, Turkish Journal of Astronomy and Astrophysics</copyright-statement>
                    <copyright-year>2020</copyright-year>
                    <copyright-holder>Turkish Journal of Astronomy and Astrophysics</copyright-holder>
                </permissions>
            
                                                                                                <abstract><p>NGC 5907 APX1, pulsasyon yapan aşırı parlak X-ışını kaynakları (APX) arasında uç X-ışını özellikleriyle tanınan bir X-ışını pulsarıdır ve zaman içinde parlaklıkta 100 kat kadar periyodik değişimler sergiler. Parlaklıkta gözlenen değişiklikler ve pulsarın dönüş evrimi, standart yığılma modelleriyle açıklanamamaktadır, bu da NGC 5907 APX1’i özellikle ilgi çekici kılmaktadır. Bu çalışmanın amacı, NGC 5907 APX1’in farklı X-ışını parlaklık fazlarındaki XMM-Newton X-ışını tayf verilerini analiz ederek, çeşitli fiziksel parametrelerin kaynağın parlaklığına bağlı olarak nasıl değiştiğini araştırmaktır. Bu çalışma ile NGC 5907 APX1’in XMM-Newton gözlem verilerinin tayfsal analizinden elde edilen fiziksel veriler sayesinde ilgili parametrelerin karşılıklı ilişkileri ortaya çıkarılmaktadır. Tayfsal analiz, bu APX’in tayfına yeterli uyum gösteren tek bileşenli tayf modellerinden diskpbb modeli çerçevesinde iç disk sıcaklığı ve hidrojen kolon yoğunluğunun değişimleri üzerine yoğunlaşmaktadır.</p></abstract>
                                                                                                                                    <trans-abstract xml:lang="en">
                            <p>NGC 5907 ULX1 is an X-ray pulsar well known due to its extreme X-ray characteristics among pulsating ultraluminous X-ray sources (ULX), exhibiting periodic brightness variations of up to a factor of 100 over time. The observed variations in brightness and the rotational evolution of the pulsar cannot be explained by standard accretion models, making NGC 5907 ULX1 particularly intriguing. The aim of this study is to investigate how various physical parameters change with the source luminosity, by analyzing the X-ray spectral data of NGC 5907 ULX1 obtained with XMM-Newton across different X-ray brightness phases. This study reveals the correlations of these parameters thanks to the physical data obtained through the spectral analysis of the XMM-Newton observational data of NGC 5907 ULX1. The spectral analysis focuses on the variations of inner disk temperature and hydrogen column density within the framework of one of the single-component spectral models, the diskpbb model, which adequately fits the spectrum of this ULX.</p></trans-abstract>
                                                            
            
                                                            <kwd-group>
                                                    <kwd>accretion</kwd>
                                                    <kwd>  X-ray binaries</kwd>
                                                    <kwd>  neutron star</kwd>
                                                    <kwd>  ultraluminous X-ray pulsar</kwd>
                                            </kwd-group>
                                                        
                                                                            <kwd-group xml:lang="en">
                                                    <kwd>accretion</kwd>
                                                    <kwd>  X-ray binaries</kwd>
                                                    <kwd>  neutron star</kwd>
                                                    <kwd>  ultraluminous X-ray pulsar</kwd>
                                            </kwd-group>
                                                                                                        <funding-group specific-use="FundRef">
                    <award-group>
                                                    <funding-source>
                                <named-content content-type="funder_name">Bu çalışma BÜ Bilimsel Araştırma Projeleri tarafından 19951 kodu ile desteklenmiştir.</named-content>
                            </funding-source>
                                                                    </award-group>
                </funding-group>
                                </article-meta>
    </front>
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