Monthly Notices of the Royal Astronomical Society: Letters最新文献_第9页

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

Past the outer rim, into the unknown: Structures beyond the Kuiper Cliff 越过外缘，进入未知:柯伊伯悬崖外的结构

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-21 DOI: 10.1093/mnrasl/slad132

Marcos, C. de la Fuente, Marcos, R. de la Fuente

引用次数: 0

Temperature dependent convective parameters for RRc 1D-models RRc 1d模型的温度相关对流参数

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-18 DOI: 10.1093/mnrasl/slad131

Kovács, Gábor B., Nuspl, János, Szabó, Róbert

{"title":"Temperature dependent convective parameters for RRc 1D-models","authors":"Kovács, Gábor B., Nuspl, János, Szabó, Róbert","doi":"10.1093/mnrasl/slad131","DOIUrl":"https://doi.org/10.1093/mnrasl/slad131","url":null,"abstract":"Nonlinear pulsation modeling of classical variable stars is among the first topics which were developed at the beginning of the computational era. Various developments were made, and many questions were answered in the past 60 years, and the models became more complex, describing the genuinely 3D convection in a single dimension. Despite its successes, the recent public availability of the MESA Radial Stellar Pulsations (MESA RSP) module and the emerging results from multidimensional codes made clear that the 8 free convective parameters, unique to these models, together with the underlying physical models need calibration. This could be done by comparing them against multi-dimensional codes, but before that, it is important to scrutinize the free parameters of the 1D codes using observations. This is a follow-up work of our previous calibration on the convective parameters of the Budapest-Florida and MESA RSP pulsation codes for RRab stars. In this paper, we extend the previous calibration to the RRc stars and the RR Lyrae stars in general. We found that correlations of some of the parameters are present in RRc stars as well but have a different nature, while high-temperature RRc stars' pulsation properties are very sensitive to the chosen parameter sets.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135109777","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

Doppler confirmation of TESS planet candidate TOI1408.01: grazing transit and likely eccentric orbit TESS候选行星TOI1408.01的多普勒确认:掠食过境和可能的偏心轨道

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-05 DOI: 10.1093/mnrasl/slad127

G. Galazutdinov, R. Baluev, G. Valyavin, V. Aitov, D. Gadelshin, A. Valeev, E. Sendzikas, E. Sokov, G. Mitiani, T. Burlakova, I. Yakunin, K. Antonyuk, V. Vlasyuk, I. Romanyuk, A. Rzaev, M. Yushkin, A. Ivanova, A. Tavrov, O. Korablev

{"title":"Doppler confirmation of TESS planet candidate TOI1408.01: grazing transit and likely eccentric orbit","authors":"G. Galazutdinov, R. Baluev, G. Valyavin, V. Aitov, D. Gadelshin, A. Valeev, E. Sendzikas, E. Sokov, G. Mitiani, T. Burlakova, I. Yakunin, K. Antonyuk, V. Vlasyuk, I. Romanyuk, A. Rzaev, M. Yushkin, A. Ivanova, A. Tavrov, O. Korablev","doi":"10.1093/mnrasl/slad127","DOIUrl":"https://doi.org/10.1093/mnrasl/slad127","url":null,"abstract":"\u0000 We report an independent Doppler confirmation of the TESS planet candidate orbiting an F-type main sequence star TOI-1408 located 140 pc away. We present a set of radial velocities obtained with a high-resolution fiber-optic spectrograph FFOREST mounted at the SAO RAS 6-m telescope (BTA-6). Our self- consistent analysis of these Doppler data and TESS photometry suggests a grazing transit such that the planet obscures its host star by only a portion of the visible disc. Because of this degeneracy, the radius of TOI-1408.01 appears ill-determined with lower limit about ∼1 RJup, significantly larger than in the current TESS solution. We also derive the planet mass of 1.69 ± 0.20 MJup and the orbital period ∼4.425 days, thus making this object a typical hot Jupiter, but with a significant orbital eccentricity of 0.259 ± 0.026. Our solution may suggest the planet is likely to experience a high tidal eccentricity migration at the stage of intense orbital rounding, or may indicate possible presence of other unseen companions in the system, yet to be detected.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"90 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85651635","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: 1

Precessing binary black holes as better dark sirens 把双黑洞当作更好的黑暗警报器

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-04 DOI: 10.1093/mnrasl/slad119

Qianyun Yun, Wen-Biao Han, Qian Hu, Haiguang Xu

引用次数: 0

Two large-scale sloshing cold fronts in the outskirts of the galaxy cluster Abell 3558 星系团Abell 3558外围的两个大尺度晃动冷锋

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-30 DOI: 10.1093/mnrasl/slad129

M. Mirakhor, S. Walker, M. Sundquist, D. Chandra

引用次数: 0

The Multiwavelength Picture of GRB 221009A’s Afterglow GRB 221009A 余辉的多波长图像

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-26 DOI: 10.1093/mnrasl/slad185

M. Klinger, A. M. Taylor, T. Parsotan, A. Beardmore, S. Heinz, Sylvia J Zhu

引用次数: 0