Multiwavelength Observations of a New Redback Millisecond Pulsar 4FGL J1910.7-5320

被引：13

作者：

Au, Ka-Yui ^{[1
]}

Strader, Jay ^{[2
]}

Swihart, Samuel J. J. ^{[3
,4
]}

Lin, Lupin C. C. ^{[1
]}

Kong, Albert K. H. ^{[5
]}

Takata, Jumpei ^{[6
]}

Hui, Chung-Yue ^{[7
]}

Panurach, Teresa ^{[2
]}

Molina, Isabella ^{[2
]}

Aydi, Elias ^{[2
]}

Sokolovsky, Kirill ^{[2
]}

Li, Kwan-Lok ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Phys, 1 Univ Rd, Tainan 70101, Taiwan

[2] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[3] Natl Acad Sci, Washington, DC 20001 USA

[4] Naval Res Lab, Washington, DC 20375 USA

[5] Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan

[6] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China

[7] Chungnam Natl Univ, Dept Astron & Space Sci, Daejeon 34134, South Korea

来源：

ASTROPHYSICAL JOURNAL | 2023年 / 943卷 / 02期

基金：

新加坡国家研究基金会; 美国国家科学基金会; 美国国家航空航天局; 瑞典研究理事会;

关键词：

LARGE-AREA TELESCOPE; BINARY; COMPANION; CATALOG;

D O I：

10.3847/1538-4357/acae8a

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the study of multiwavelength observations of an unidentified Fermi Large Area Telescope (LAT) source, 4FGL J1910.7-5320, a new candidate redback millisecond pulsar binary. In the 4FGL 95% error region of 4FGL J1910.7-5320, we find a possible binary with a 8.36 hr orbital period from the Catalina Real-Time Transient Survey, confirmed by optical spectroscopy using the SOAR telescope. This optical source was recently independently discovered as a redback pulsar by the TRAPUM project, confirming our prediction. We fit the optical spectral energy distributions of 4FGL J1910.7-5320 with a blackbody model, inferring a maximum distance of 4.1 kpc by assuming that the companion fills its Roche lobe with a radius of R = 0.7 R-circle dot. Using a 12.6 ks Chandra X-ray observation, we identified an X-ray counterpart for 4FGL J1910.7-5320, with a spectrum that can be described by an absorbed power law with a photon index of 1.0 +/- 0.4. The spectrally hard X-ray emission shows tentative evidence for orbital variability. Using more than 12 yr of Fermi-LAT data, we refined the position of the gamma-ray source, and the optical candidate still lies within the 68% positional error circle. In addition to 4FGL J1910.7-5320, we find a variable optical source with a periodic signal of 4.28 hr inside the 4FGL catalog 95% error region of another unidentified Fermi source, 4FGL J2029.5-4237. However, the gamma-ray source does not have a significant X-ray counterpart in an 11.7 ks Chandra observation, with a 3 sigma flux upper limit of 2.4 x 10(-14) erg cm(-2) s(-1) (0.3-7 keV). Moreover, the optical source is outside our updated Fermi-LAT 95% error circle. These observational facts all suggest that this new redback millisecond pulsar powers the gamma-ray source 4FGL J1910.7-5320 while 4FGL J2029.5-4237 is unlikely the gamma-ray counterpart to the 4.28 hr variable.

引用

页数：8

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