NinjaSat monitoring of Type-I X-ray bursts from the clocked burster SRGA J144459.2$-$604207
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| Format: | Preprint |
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2024
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| _version_ | 1866910984916959232 |
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| author | Takeda, Tomoshi Tamagawa, Toru Enoto, Teruaki Kitaguchi, Takao Kato, Yo Mihara, Tatehiro Iwakiri, Wataru Numazawa, Masaki Ota, Naoyuki Watanabe, Sota Jujo, Arata Aoyama, Amira Iwata, Satoko Takahashi, Takuya Yamasaki, Kaede Hu, Chin-Ping Takahashi, Hiromitsu Dohi, Akira Nishimura, Nobuya Hirai, Ryosuke Yoshida, Yuto Sato, Hiroki Hayashi, Syoki Zhou, Yuanhui Uchiyama, Keisuke Odaka, Hirokazu Tamba, Tsubasa Taniguchi, Kentaro |
| author_facet | Takeda, Tomoshi Tamagawa, Toru Enoto, Teruaki Kitaguchi, Takao Kato, Yo Mihara, Tatehiro Iwakiri, Wataru Numazawa, Masaki Ota, Naoyuki Watanabe, Sota Jujo, Arata Aoyama, Amira Iwata, Satoko Takahashi, Takuya Yamasaki, Kaede Hu, Chin-Ping Takahashi, Hiromitsu Dohi, Akira Nishimura, Nobuya Hirai, Ryosuke Yoshida, Yuto Sato, Hiroki Hayashi, Syoki Zhou, Yuanhui Uchiyama, Keisuke Odaka, Hirokazu Tamba, Tsubasa Taniguchi, Kentaro |
| contents | The CubeSat X-ray observatory NinjaSat was launched on 2023 November 11 and has provided opportunities for agile and flexible monitoring of bright X-ray sources. On 2024 February 23, the NinjaSat team started long-term observation of the new X-ray source SRGA J144459.2$-$604207 as the first scientific target, which was discovered on 2024 February 21 and recognized as the sixth clocked X-ray burster. Our 25-day observation covered almost the entire decay of this outburst from two days after the peak at $\sim$100 mCrab on February 23 until March 18 at a few mCrab level. The Gas Multiplier Counter onboard NinjaSat successfully detected 12 Type-I X-ray bursts with a typical burst duration of $\sim$20 s, shorter than other clocked burster systems. As the persistent X-ray emission declined by a factor of five, X-ray bursts showed a notable change in its morphology: the rise time became shorter from 4.4(7) s to 0.3(3) s (1$σ$ errors), and the peak amplitude increased by 44%. The burst recurrence time $Δt_{\rm rec}$ also became longer from 2 hr to 10 hr, following the relation of $Δt_{\rm rec} \propto F_{\rm per}^{-0.84}$, where $F_{\rm per}$ is the persistent X-ray flux, by applying a Markov chain Monte Carlo method. The short duration of bursts is explained by the He-enhanced composition of accretion matter and the relation between $Δt_{\textrm{rec}}$ and $F_{\rm per}$ by a massive neutron star. This study demonstrated that CubeSat pointing observations can provide valuable astronomical X-ray data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_10992 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | NinjaSat monitoring of Type-I X-ray bursts from the clocked burster SRGA J144459.2$-$604207 Takeda, Tomoshi Tamagawa, Toru Enoto, Teruaki Kitaguchi, Takao Kato, Yo Mihara, Tatehiro Iwakiri, Wataru Numazawa, Masaki Ota, Naoyuki Watanabe, Sota Jujo, Arata Aoyama, Amira Iwata, Satoko Takahashi, Takuya Yamasaki, Kaede Hu, Chin-Ping Takahashi, Hiromitsu Dohi, Akira Nishimura, Nobuya Hirai, Ryosuke Yoshida, Yuto Sato, Hiroki Hayashi, Syoki Zhou, Yuanhui Uchiyama, Keisuke Odaka, Hirokazu Tamba, Tsubasa Taniguchi, Kentaro High Energy Astrophysical Phenomena The CubeSat X-ray observatory NinjaSat was launched on 2023 November 11 and has provided opportunities for agile and flexible monitoring of bright X-ray sources. On 2024 February 23, the NinjaSat team started long-term observation of the new X-ray source SRGA J144459.2$-$604207 as the first scientific target, which was discovered on 2024 February 21 and recognized as the sixth clocked X-ray burster. Our 25-day observation covered almost the entire decay of this outburst from two days after the peak at $\sim$100 mCrab on February 23 until March 18 at a few mCrab level. The Gas Multiplier Counter onboard NinjaSat successfully detected 12 Type-I X-ray bursts with a typical burst duration of $\sim$20 s, shorter than other clocked burster systems. As the persistent X-ray emission declined by a factor of five, X-ray bursts showed a notable change in its morphology: the rise time became shorter from 4.4(7) s to 0.3(3) s (1$σ$ errors), and the peak amplitude increased by 44%. The burst recurrence time $Δt_{\rm rec}$ also became longer from 2 hr to 10 hr, following the relation of $Δt_{\rm rec} \propto F_{\rm per}^{-0.84}$, where $F_{\rm per}$ is the persistent X-ray flux, by applying a Markov chain Monte Carlo method. The short duration of bursts is explained by the He-enhanced composition of accretion matter and the relation between $Δt_{\textrm{rec}}$ and $F_{\rm per}$ by a massive neutron star. This study demonstrated that CubeSat pointing observations can provide valuable astronomical X-ray data. |
| title | NinjaSat monitoring of Type-I X-ray bursts from the clocked burster SRGA J144459.2$-$604207 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2411.10992 |