Publications of the Astronomical Society of Japan最新文献_第6页

Survey of public attitudes toward astronomy in Japan 日本公众对天文学态度的调查

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2024-01-20 DOI: 10.1093/pasj/psad084

Naohiro Takanashi, Masaaki Hiramatsu, Shio Kawagoe, Nobuhiko Kusakabe, Koki Sawada, Harufumi Tamazawa

引用次数: 0

X-ray iron absorption line in Swift J1858.6−0814 Swift J1858.6-0814 中的 X 射线铁吸收线

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2024-01-12 DOI: 10.1093/pasj/psad082

Kazumi Asai, Tatehiro Mihara, Kento Sakai, Aya Kubota

引用次数: 0

The variability of the broad line profiles of SDSS J1430+2303 SDSS J1430+2303 宽线剖面的变异性

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2024-01-12 DOI: 10.1093/pasj/psad083

Atsushi Hoshi, Toru Yamada, Kouji Ohta

{"title":"The variability of the broad line profiles of SDSS J1430+2303","authors":"Atsushi Hoshi, Toru Yamada, Kouji Ohta","doi":"10.1093/pasj/psad083","DOIUrl":"https://doi.org/10.1093/pasj/psad083","url":null,"abstract":"It has been argued that SDSS J1430+2303 possesses a supermassive black hole binary that has been predicted to merge within a few months or three years from 2022 January. We have conducted follow-up optical spectroscopic observations of SDSS J1430+2303 with the KOOLS-IFU on the Seimei Telescope in 2022 May, June, and July, and 2023 April. The observed spectrum around Hα shows a central broad component ∼103 km s−1 blueshifted from the narrow Hα line, as well as a broader double-peaked component with a separation of ∼± 5 × 103 km s−1, similar to the spectrum reported in 2022 January. We investigate the variability of the complex broad Hα emission line relative to the continuum over the observation period. The continuum-normalized relative flux of the central broad component shows an increasing trend from 2022 May to July, which is interpreted to be caused by the decrease of the continuum; this is also supported by damping of the X-ray, UV, and optical light curves observed for the same period. From 2022 July to 2023 April, however, the central broad component decreased significantly. For the relative flux of the broader double-peaked component, no significant change appears at any epoch. These results suggest that the complicated broad line profile of SDSS J1430+2303 is generated from at least two distinct regions. While the central broad component originates from a broad-line region, the broader double-peaked component arises in the vicinity of the continuum source.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":"26 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139458620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The history of the Milky Way: The evolution of star formation, cosmic rays, metallicity, and stellar dynamics over cosmic time 银河系的历史恒星形成、宇宙射线、金属性和恒星动力学随宇宙时间的演变

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2024-01-12 DOI: 10.1093/pasj/psad081

Jiro Shimoda, Shu-ichiro Inutsuka, Masahiro Nagashima

{"title":"The history of the Milky Way: The evolution of star formation, cosmic rays, metallicity, and stellar dynamics over cosmic time","authors":"Jiro Shimoda, Shu-ichiro Inutsuka, Masahiro Nagashima","doi":"10.1093/pasj/psad081","DOIUrl":"https://doi.org/10.1093/pasj/psad081","url":null,"abstract":"We study the long-term evolution of the Milky Way (MW) over cosmic time by modeling the star formation, cosmic rays, metallicity, stellar dynamics, outflows, and inflows of the galactic system to obtain various insights into the galactic evolution. The mass accretion is modeled by the results of cosmological N-body simulations for the cold dark matter. We find that the star formation rate is about half the mass accretion rate of the disk, given the consistency between observed Galactic diffuse X-ray emissions (GDXEs) and possible conditions driving the Galactic wind.Our model simultaneously reproduces the quantities of star formation rate, cosmic rays, metals, and the rotation curve of the current MW. The most important predictions of the model are that there is an unidentified accretion flow with a possible number density of ∼10−2 cm−3 and that part of the GDXEs originates from a hot, diffuse plasma which is formed by consuming about $10%$ of supernova explosion energy. The latter is the science case for future X-ray missions: XRISM, Athena, and so on. We also discuss further implications of our results for the planet formation and observations of external galaxies in terms of multi-messenger astronomy.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":"32 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139458793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tentative detection of cyanoformamide NCCONH2 in space 在太空中初步探测到氰甲酰胺 NCCONH2

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-12-18 DOI: 10.1093/pasj/psad079

Juan Li, Donghui Quan, Junzhi Wang, Xia Zhang, Xing Lu, Qian Gou, Feng Gao, Yajun Wu, Edwin Bergin, Shanghuo Li, Zhiqiang Shen, Fujun Du, Meng Li, Siqi Zheng, Xingwu Zheng

引用次数: 0

KAgoshima Galactic Object survey with Nobeyama 45 m telescope by Mapping in Ammonia lines (KAGONMA): Discovery of parsec-scale CO depletion in the Canis Major star-forming region 利用野边山 45 米望远镜通过氨线测绘（KAGONMA）进行鹿儿岛星系天体巡天：发现大犬座恒星形成区的等秒尺度CO耗竭

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-12-07 DOI: 10.1093/pasj/psad080

Yushi Hirata, Takeru Murase, Junya Nishi, Yoshito Shimajiri, Toshihiro Omodaka, Makoto Nakano, Kazuyoshi Sunada, Takumi Ito, Toshihiro Handa

{"title":"KAgoshima Galactic Object survey with Nobeyama 45 m telescope by Mapping in Ammonia lines (KAGONMA): Discovery of parsec-scale CO depletion in the Canis Major star-forming region","authors":"Yushi Hirata, Takeru Murase, Junya Nishi, Yoshito Shimajiri, Toshihiro Omodaka, Makoto Nakano, Kazuyoshi Sunada, Takumi Ito, Toshihiro Handa","doi":"10.1093/pasj/psad080","DOIUrl":"https://doi.org/10.1093/pasj/psad080","url":null,"abstract":"In observational studies of infrared dark clouds, the number of detections of CO freeze-out on to dust grains (CO depletion) at the pc scale is extremely limited, and the conditions for its occurrence are, therefore, still unknown. We report a new object where pc-scale CO depletion is expected. As part of the Kagoshima Galactic Object survey with Nobeyama 45 m telescope by Mapping in Ammonia lines (KAGONMA), we have made mapping observations of NH3 inversion transition lines towards the star-forming region associated with Canis Major OB1, including IRAS 07077−1026, IRAS 07081−1028, and PGCC G224.28−0.82. By comparing the spatial distributions of NH3 (1,1) and C18O (J = 1–0), an intensity anti-correlation was found in IRAS 07077−1026 and IRAS 07081−1028 on the ∼1 pc scale. Furthermore, we obtained a lower abundance of C18O at least in IRAS 07077−1026 than in the other parts of the star-forming region. After examining high-density gas dissipation, photodissociation, and CO depletion, we concluded that the intensity anti-correlation in IRAS 07077−1026 is due to CO depletion. On the other hand, in the vicinity of the center of PGCC G224.28−0.82, the emission line intensities of both NH3 (1,1) and C18O (J = 1–0) were strongly detected, although the gas temperature and density were similar to IRAS 07077−1026. This indicates that there are situations where C18O (J = 1–0) cannot trace dense gas on the pc scale and implies that the conditional differences in which C18O (J = 1–0) can and cannot trace dense gas are unclear.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":"226 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138556306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic activity variability of nearby bright Sun-like stars by 4 yr intensive Hα line monitoring 用4年密集的α谱线监测邻近明亮类太阳恒星的磁活动变化

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-12-04 DOI: 10.1093/pasj/psad077

Sanghee Lee, Yuta Notsu, Bun’ei Sato

{"title":"Magnetic activity variability of nearby bright Sun-like stars by 4 yr intensive Hα line monitoring","authors":"Sanghee Lee, Yuta Notsu, Bun’ei Sato","doi":"10.1093/pasj/psad077","DOIUrl":"https://doi.org/10.1093/pasj/psad077","url":null,"abstract":"We report intensive monitoring of the activity variability in the Hα line for 10 Sun-like stars using the 1.88 m reflector at Okayama Branch Office, Subaru Telescope, during the last four years (2019–2022). Our aim was to investigate features of the stellar magnetic activity behavior. We correlated the Hα line variability of each star with the stellar activity levels derived from the Ca ii H&K line, suggesting its efficiency as a magnetic activity indicator. In analyzing the Hα line variation, we observed that some stars exhibited linear or quadratic trends during the observation period. Among several G- and K-type stars expected to have co-existing activity cycles, we confirmed the 2.9 yr short cycle of ϵ Eri (K2V) from the Hα observations. Additionally, we established upper limits on the Hα variability of β Com (G0V) and κ1 Cet (G5V) concerning their expected shorter cycles. We also detected the possibility of short-term activity cycles in two F-type stars, β Vir (F9V; ∼530 d) and α CMi (F5IV-V; ∼130 d). The cycle in α CMi was observed in only one season of our 4 yr observations, suggesting the temporal absence of the cycle period. However, for stars with planets, we did not observe significant magnetic activity variability likely associated with the planetary orbital period. It is speculated that the impact of Hα variability on radial velocity (RV) measurements may vary with spectral type.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":"14 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138507863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sulfur isotopes toward the extended envelope of Sagittarius B2 in the Galactic Center 银河系中心人马座B2扩展包层的硫同位素

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-12-04 DOI: 10.1093/pasj/psad078

Qingxu Li, Juan Li, Siqi Zheng, Junzhi Wang, Feng Gao, Yajun Wu

引用次数: 0

HINOTORI I: The nature of rejuvenation galaxies HINOTORI:星系复兴的本质

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-11-28 DOI: 10.1093/pasj/psad076

Takumi S Tanaka, Kazuhiro Shimasaku, Sandro Tacchella, Makoto Ando, Kei Ito, Hassen M Yesuf, Suin Matsui

{"title":"HINOTORI I: The nature of rejuvenation galaxies","authors":"Takumi S Tanaka, Kazuhiro Shimasaku, Sandro Tacchella, Makoto Ando, Kei Ito, Hassen M Yesuf, Suin Matsui","doi":"10.1093/pasj/psad076","DOIUrl":"https://doi.org/10.1093/pasj/psad076","url":null,"abstract":"We present the HINOTORI (Star Formation History Investigation To Find Rejuvenation) project to reveal the nature of rejuvenation galaxies (RGs), which are galaxies that restarted their star formation after being quiescent. As the first step of HINOTORI, we construct the largest RG sample with 1071 sources. We select these RGs from 8857 MaNGA (Mapping Nearby Galaxies at APO) survey galaxies by reconstructing their star formation histories with the Prospector spectral energy distribution fitting code. Both optical spectral data and UV to IR photometric data are used for the fitting. Using mock data, we confirm that our method can detect weak rejuvenation events that form only about $0.1$% of the total stellar mass with high completeness. The RGs account for ${sim}10$% of the whole sample, and rejuvenation events contribute on average only about $0.1$% of the total stellar mass in those galaxies but $17$% of the cosmic star formation rate density today. Our RGs have a similar mass distribution to quiescent galaxies (QGs). However, the morphology of the RGs is more disk-like than QGs, suggesting that rejuvenation may occur selectively in disk-like QGs. Our results also suggest the possibility of multiple-time rejuvenation events in a single galaxy. Further spatially resolved analyses of integral field unit data and radio observations and comparisons to simulations are needed to identify the mechanism and the role of rejuvenation in galaxy evolution.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":"17 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138507877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

12CO and 13CO observation of the low-metallicity dwarf galaxy DDO 154 低金属丰度矮星系DDO 154的12CO和13CO观测

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-11-17 DOI: 10.1093/pasj/psad074

Shinya Komugi, Miku Inaba, Tetsuo Shindou

引用次数: 0