Monthly Notices of the Royal Astronomical Society: Letters最新文献_第7页

First constraints on the strength of the extragalactic magnetic field from γ-ray observations of GRB 221009A GRB 221009A γ射线观测对河外磁场强度的首次约束

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-03 DOI: 10.1093/mnrasl/slad142

Timur A Dzhatdoev, Egor I Podlesnyi, Grigory I Rubtsov

引用次数: 0

Growing Local arm inferred by the breathing motion 通过呼吸运动推断当地手臂的增长情况

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-03 DOI: 10.1093/mnrasl/slad190

T. Asano, Daisuke Kawata, Michiko S. Fujii, Junichi Baba

{"title":"Growing Local arm inferred by the breathing motion","authors":"T. Asano, Daisuke Kawata, Michiko S. Fujii, Junichi Baba","doi":"10.1093/mnrasl/slad190","DOIUrl":"https://doi.org/10.1093/mnrasl/slad190","url":null,"abstract":"Theoretical models of spiral arms suggest that the spiral arms provoke a vertical bulk motion in disc stars. By analysing the breathing motion, a coherent asymmetric vertical motion around the mid-plane of the Milky Way disc, with Gaia DR3, we found that a compressing breathing motion presents along the Local arm. On the other hand, with an N-body simulation of an isolated Milky Way-like disc galaxy, we found that the transient and dynamic spiral arms induce compressing breathing motions when the arms are in the growth phase, while the expanding breathing motion appears in the disruption phase. The observed clear alignment of the compressing breathing motion with the Local arm is similar to what is seen in the growth phase of the simulated spiral arms. Hence, we suggest that the Local arm’s compressing breathing motion can be explained by the Local arm being in the growth phase of a transient and dynamic spiral arm. We also identified the tentative signatures of the expanding breathing motion associated with the Perseus arm and also the Outer arm coinciding with the compressing breathing motion. This may infer that the Perseus and Outer arms are in the disruption and growth phases, respectively.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139324001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new, purely photometric method for determination of resonance locations in spiral galaxies 确定螺旋星系共振位置的一种新的纯光度法

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-01 DOI: 10.1093/mnrasl/slad141

Alexander A Marchuk, Aleksandr V Mosenkov, Ilia V Chugunov, Valeria S Kostiuk, Maria N Skryabina, Vladimir P Reshetnikov

{"title":"A new, purely photometric method for determination of resonance locations in spiral galaxies","authors":"Alexander A Marchuk, Aleksandr V Mosenkov, Ilia V Chugunov, Valeria S Kostiuk, Maria N Skryabina, Vladimir P Reshetnikov","doi":"10.1093/mnrasl/slad141","DOIUrl":"https://doi.org/10.1093/mnrasl/slad141","url":null,"abstract":"ABSTRACT The knowledge of the positions of the corotation resonance in spiral arms is a key way to estimate their pattern speed, which is a fundamental parameter determining the galaxy dynamics. Various methods for its estimation have been developed, but they all demonstrate certain limitations and a lack of agreement with each other. Here, we present a new method for estimating the corotation radius. This method takes into account the shape of the profile across the arm and its width and, thus, only photometric data is needed. The significance of the method is that it can potentially be used for the farthest galaxies with measurable spiral arms. We apply it to a sample of local galaxies from Savchenko et al.(2020) and compare the obtained corotation radii with those previously measured in the literature by other methods. Our results are in good agreement with the literature. We also apply the new method to distant galaxies from the COSMOS field. For the first time, corotation locations for galaxies with photometric redshifts up to z ∼ 0.9 are measured.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135458435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new tidal scenario for double bar formation 双棒形成的新潮汐情景

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-29 DOI: 10.1093/mnrasl/slad175

M. Semczuk, E. Łokas, A. de Lorenzo-Cáceres, E. Athanassoula

引用次数: 0

Return of harrison-zeldovich spectrum in light of recent cosmological tensions 根据最近宇宙学的紧张局势，哈里森-泽尔多维奇光谱的回归

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-27 DOI: 10.1093/mnrasl/slad137

Jun-Qian Jiang, Gen Ye, Yun-Song Piao

引用次数: 7

Palomar discovery and initial characterization of naked-eye long period comet C/2022 E3 (ZTF) 长周期彗星C/2022 E3 (ZTF)的帕洛马发现与初步表征

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-27 DOI: 10.1093/mnrasl/slad139

B T Bolin, F J Masci, D A Duev, J W Milburn, J D Neill, J N Purdum, C Avdellidou, Y-C Cheng, M Delbo, C Fremling, M Ghosal, Z-Y Lin, C M Lisse, A Mahabal, M Saki

{"title":"Palomar discovery and initial characterization of naked-eye long period comet C/2022 E3 (ZTF)","authors":"B T Bolin, F J Masci, D A Duev, J W Milburn, J D Neill, J N Purdum, C Avdellidou, Y-C Cheng, M Delbo, C Fremling, M Ghosal, Z-Y Lin, C M Lisse, A Mahabal, M Saki","doi":"10.1093/mnrasl/slad139","DOIUrl":"https://doi.org/10.1093/mnrasl/slad139","url":null,"abstract":"ABSTRACT Long-period comets are planetesimal remnants constraining the environment and volatiles of the protoplanetary disc. We report the discovery of hyperbolic long-period comet C/2022 E3 Zwicky Transient Facility (ZTF), which has a perihelion ∼1.11 au, an eccentricity ≳1 and an inclination ∼109°, from images taken with the Palomar 48-inch telescope during morning twilight on 2022 March 2. Additionally, we report the characterization of C/2022 E3 (ZTF) from observations taken with the Palomar 200-inch, the Palomar 60-inch, and the NASA Infrared Telescope Facility in early 2023 February to 2023 March when the comet passed within ∼0.28 au of the Earth and reached a visible magnitude of ∼5. We measure g–r = 0.70 ± 0.01, r–i = 0.20 ± 0.01, i–z = 0.06 ± 0.01, z–J = 0.90 ± 0.01, J–H = 0.38 ± 0.01, and H–K = 0.15 ± 0.01 colours for the comet from observations. We measure the A(0°)fρ (0.8 μm) in a 6500 km radius from the nucleus of 1483 ± 40 cm, and CN, C3, and C2 production of 5.43 ± 0.11 × 1025, 2.01 ± 0.04 × 1024, and 3.08 ± 0.5 × 1025 mol s−1, similar to other long-period comets. We additionally observe the appearance of jet-like structures at a scale of ∼4000 km in wide-field g-band images, which may be caused by the presence of CN gas in the near-nucleus coma.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"2010 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135579807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neutrino flares of radio blazars observed from TeV to PeV 从TeV到PeV观测到的射电耀变体的中微子耀斑

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-26 DOI: 10.1093/mnrasl/slad136

Alisa Suray, Sergey Troitsky

引用次数: 1

Dark matter-induced stellar oscillations 暗物质引起的恒星振荡

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-22 DOI: 10.1093/mnrasl/slad133

Jeremy Sakstein, Ippocratis D Saltas

引用次数: 0

The Role of Groups in Galaxy Evolution: compelling evidence of pre-processing out to the turnaround radius of clusters 星团在星系演化中的角色:对星团旋转半径进行预处理的有力证据

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-22 DOI: 10.1093/mnrasl/slad134

Lopes, P. A. A., Ribeiro, A. L. B., Brambila, D.

{"title":"The Role of Groups in Galaxy Evolution: compelling evidence of pre-processing out to the turnaround radius of clusters","authors":"Lopes, P. A. A., Ribeiro, A. L. B., Brambila, D.","doi":"10.1093/mnrasl/slad134","DOIUrl":"https://doi.org/10.1093/mnrasl/slad134","url":null,"abstract":"ABSTRACT We present clear and direct evidence of the pre-processing effect of group galaxies falling into clusters in the local Universe (z ≲ 0.1). We start with a sample of 238 clusters, from which we select 153 with N200 ≥ 20. We considered 1641 groups within the turnaround radius (∼5 × R200) of these 153 clusters. There are 6654 individual cluster galaxies and 4133 group galaxies within this radius. We considered two control samples of galaxies, in isolated groups and in the field. The former comprises 2601 galaxies within 1606 isolated groups, and the latter has 4273 field objects. The fraction of star-forming galaxies in infalling groups has a distinct clustercentric behaviour in comparison to the remaining cluster galaxies. Even at 5 × R200 the group galaxies already show a reduced fraction of star-forming objects. At this radius, the results for the individual cluster galaxies are actually compatible with the field. That is strong evidence that the group environment is effective to quench the star formation prior to the cluster arrival. The group star-forming fraction remains roughly constant inwards, decreasing significantly only within the cluster R200 radius. We have also found that the pre-processing effect depends on the group mass (indicated by the number of members). The effect is larger for more massive groups. However, it is significant even for pairs and triplets. Finally, we find evidence that the time-scale required for morphological transformation is larger than the one for quenching.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136061911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The stellar occultation by (319) Leona on 13 September 2023 in preparation for the occultation of Betelgeuse 2023 年 9 月 13 日 (319) 木卫二掩星，为遮住参宿四做准备

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-21 DOI: 10.1093/mnrasl/slad179

J. L. Ortiz, M. Kretlow, C. Schnabel, N. Morales, J. Flores-Mart'in, M. S. Gonz'alez, F. Casarramona, A. Selva, C. Perell'o, A. Rom'an-Reche, S. Alonso, J. Rizos, R. Gonccalves, A. Castillo, J. Madiedo, P. M. S'anchez, J. M. F. and'ujar, J. L. Maestre, E. Smith, M. Gil, V. Pelenjow, S. M. Soriano, J. Mart'i, P. Luque-Escamilla, R. Casas, J. D. Casal, J. Rovira, F. Aceituno, V. Dekert, V. D. O. Guimer'a, J. Estepa, Y. Kilic, Rodrigo Leiva, P. Santos-Sanz, R. Duffard, E. Fern'andez-Valenzuela, M. Vara-Lubiano, A. Alvarez-Candal, F. Rommel

{"title":"The stellar occultation by (319) Leona on 13 September 2023 in preparation for the occultation of Betelgeuse","authors":"J. L. Ortiz, M. Kretlow, C. Schnabel, N. Morales, J. Flores-Mart'in, M. S. Gonz'alez, F. Casarramona, A. Selva, C. Perell'o, A. Rom'an-Reche, S. Alonso, J. Rizos, R. Gonccalves, A. Castillo, J. Madiedo, P. M. S'anchez, J. M. F. and'ujar, J. L. Maestre, E. Smith, M. Gil, V. Pelenjow, S. M. Soriano, J. Mart'i, P. Luque-Escamilla, R. Casas, J. D. Casal, J. Rovira, F. Aceituno, V. Dekert, V. D. O. Guimer'a, J. Estepa, Y. Kilic, Rodrigo Leiva, P. Santos-Sanz, R. Duffard, E. Fern'andez-Valenzuela, M. Vara-Lubiano, A. Alvarez-Candal, F. Rommel","doi":"10.1093/mnrasl/slad179","DOIUrl":"https://doi.org/10.1093/mnrasl/slad179","url":null,"abstract":"On 12 December 2023, the star α Orionis will be occulted by asteroid (319) Leona. This represents an extraordinary and unique opportunity to analyze the brightness distribution of Betelgeuse’s photosphere with extreme angular resolution by studying lightcurves from different points on Earth and at different wavelengths. Here we present observations of another occultation by asteroid Leona, on 13 September 2023, whose goal was to determine Leona’s projected shape and size in preparation for the December 12th event and its interpretation. The occultation campaign was highly successful with 25 positive detections from 17 different sites and a near miss. The effective diameter in projected area derived from the positive detections was 66 ± 2 km using an elliptical fit to the instantaneous limb. The body is highly elongated, with dimensions of 79.6 ± 2.2 km x 54.8 ± 1.3 km in its long and short axis, respectively, at occultation time. This result, in combination with dense time series photometry of Leona that we recently obtained, together with archival sparse photometry, allowed us to predict the angular size of the asteroid for the Betelgeuse event and to simulate the expected brightness change. Also, an accurate position coming from the occultation is provided, to improve the orbit of Leona.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139338045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0