Monthly Notices of the Royal Astronomical Society: Letters最新文献_第10页

Lowest accreting protoplanetary discs consistent with X-ray photoevaporation driving their final dispersal 最低吸积的原行星盘与x射线光蒸发驱动它们最终扩散一致

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-24 DOI: 10.1093/mnrasl/slad123

B. Ercolano, G. Picogna, Kristina Monsch

引用次数: 0

What absorbs the early TeV photons of GRB 221009A? 是什么吸收了 GRB 221009A 的早期 TeV 光子？

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-21 DOI: 10.1093/mnrasl/slad188

Jun Shen, Y. Zou, A. Chen, Duan Gao

引用次数: 0

A radio bridge connecting the minihalo and phoenix in the Abell 85 cluster 在Abell 85星团中连接迷你光环和凤凰的无线电桥

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-17 DOI: 10.1093/mnrasl/slad117

R. Raja, M. Rahaman, A. Datta, O. Smirnov

{"title":"A radio bridge connecting the minihalo and phoenix in the Abell 85 cluster","authors":"R. Raja, M. Rahaman, A. Datta, O. Smirnov","doi":"10.1093/mnrasl/slad117","DOIUrl":"https://doi.org/10.1093/mnrasl/slad117","url":null,"abstract":"\u0000 Galaxy clusters are located at the nodes of cosmic filaments and therefore host a lot of hydrodynamical activity. However, cool core clusters are considered to be relatively relaxed systems without much merging activity. The Abell 85 cluster is a unique example where the cluster hosts both a cool core and multiple ongoing merging processes. In this work, we used 700 MHz uGMRT as well as MeerKAT L-band observations, carried out as part of the MGCLS, of the Abell 85. We reconfirm the presence of a minihalo in the cluster centre at 700MHz that was recently discovered in MGCLS. Furthermore, we discovered a radio bridge connecting the central minihalo and the peripheral radio phoenix. The mean surface brightness, size and flux density of the bridge at 700 MHz is found to be ∼0.14 μJy/arcsec2, ∼220 kpc and ∼4.88 mJy, respectively, with a spectral index of $alpha _{700}^{1.28} = -0.92$. Although the origin of the seed relativistic electrons is still unknown, turbulent re-acceleration caused by both the spiralling sloshing gas in the intracluster medium (ICM) and the post-shock turbulence from the outgoing merging shock associated with the phoenix formation may be responsible for the bridge.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75678954","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

Searching for magnetic fields in pulsating A-type stars: the discovery of a strong field in the probable δ Sct star HD 340577 and a null result for the γ Dor star HR 8799 在脉动a型恒星中寻找磁场:在可能的δ Sct恒星HD 340577中发现了一个强磁场，而在γ Dor恒星HR 8799中发现了一个无效结果

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-16 DOI: 10.1093/mnrasl/slad116

S. Hubrig, S. Jarvinen, J. Alvarado‐Gómez, I. Ilyin, M. Scholler

{"title":"Searching for magnetic fields in pulsating A-type stars: the discovery of a strong field in the probable δ Sct star HD 340577 and a null result for the γ Dor star HR 8799","authors":"S. Hubrig, S. Jarvinen, J. Alvarado‐Gómez, I. Ilyin, M. Scholler","doi":"10.1093/mnrasl/slad116","DOIUrl":"https://doi.org/10.1093/mnrasl/slad116","url":null,"abstract":"\u0000 Numerous δ Sct and γ Dor pulsators are identified in the region of the Hertzsprung-Russell diagram that is occupied by chemically peculiar magnetic Ap stars. The connection between δ Sct and γ Dor pulsations and the magnetic field in Ap stars is however not clear: theory suggests for magnetic Ap stars some critical field strengths for pulsation mode suppression by computing the magnetic damping effect for selected p and g modes. To test these theoretical considerations, we obtained PEPSI spectropolarimetric snapshots of the typical Ap star HD 340577, for which δ Sct-like pulsations were recently detected in TESS data, and the γ Dor pulsator HR 8799, which is a remarkable system with multiple planets and two debris disks. Our measurements reveal the presence of a magnetic field with a strength of several hundred Gauss in HD 340577. The measured mean longitudinal field would be the strongest field measured so far in a δ Sct star if the pulsational character of HD 340577 is confirmed spectroscopically. No magnetic field is detected in HR 8799.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73329231","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 first mm detection of a neutron star high-mass X-ray binary 首次探测到中子星高质量x射线双星

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-09 DOI: 10.1093/mnrasl/slad130

J van den Eijnden, L Sidoli, M Díaz Trigo, N Degenaar, I El Mellah, F Fürst, V Grinberg, P Kretschmar, S Martínez-Núñez, J C A Miller-Jones, K Postnov, T D Russell

{"title":"The first mm detection of a neutron star high-mass X-ray binary","authors":"J van den Eijnden, L Sidoli, M Díaz Trigo, N Degenaar, I El Mellah, F Fürst, V Grinberg, P Kretschmar, S Martínez-Núñez, J C A Miller-Jones, K Postnov, T D Russell","doi":"10.1093/mnrasl/slad130","DOIUrl":"https://doi.org/10.1093/mnrasl/slad130","url":null,"abstract":"ABSTRACT Neutron stars accreting from OB supergiants are often divided between persistently and transiently accreting systems, called supergiant X-ray binaries (SgXBs) and supergiant fast X-ray transients (SFXTs). This dichotomy in accretion behaviour is typically attributed to systematic differences in the massive stellar wind, binary orbit, or magnetic field configuration, but direct observational evidence for these hypotheses remains sparse. To investigate their stellar winds, we present the results of pilot 100-GHz observations of one SFXT and one SgXB with the Northern Extended Millimetre Array. The SFXT, IGR J18410-0535, is detected as a point source at 63.4 ± 9.6 μJy, while the SgXB, IGR J18410-0535 remains undetected. Radio observations of IGR J18410-0535 imply a flat or inverted low-frequency spectrum, arguing for wind emission and against non-thermal flaring. Due to the uncertain SFXT distance, however, the observations do not necessarily imply a difference between the wind properties of the SFXT and SgXB. We compare the mm constraints with other HMXBs and isolated OB supergiants, before considering how future mm campaigns can constrain HMXB wind properties by including X-ray measurements. Specifically, we discuss caveats and future steps to successfully measure wind mass-loss rates and velocities in HMXBs with coordinated mm, radio, and X-ray campaigns.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135745286","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 creation of a massive UCD by tidal threshing from NGC 936 ngc936的潮汐脱粒形成了一个巨大的UCD

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-09 DOI: 10.1093/mnrasl/slad126

Sanjaya Paudel, Pierre-Alain Duc, Sungsoon Lim, Mélina Poulain, Francine R Marleau, Oliver Müller, Rubén Sánchez-Janssen, Rebecca Habas, Patrick R Durrell, Nick Heesters, Daya Nidhi Chhatkuli, Suk-Jin Yoon

{"title":"The creation of a massive UCD by tidal threshing from NGC 936","authors":"Sanjaya Paudel, Pierre-Alain Duc, Sungsoon Lim, Mélina Poulain, Francine R Marleau, Oliver Müller, Rubén Sánchez-Janssen, Rebecca Habas, Patrick R Durrell, Nick Heesters, Daya Nidhi Chhatkuli, Suk-Jin Yoon","doi":"10.1093/mnrasl/slad126","DOIUrl":"https://doi.org/10.1093/mnrasl/slad126","url":null,"abstract":"We study a compact nucleus embedded in an early-type dwarf galaxy, MATLAS-167, which is in the process of disruption by the tidal force of the neighboring giant S0 galaxy, NGC 936, in a group environment. Using the imaging data of the MATLAS survey, we analyze the stellar tidal tail of MATLAS-167 and its central compact nucleus, designated as NGC 936_UCD. We find that NGC 936_UCD has a luminosity of M$_{g}$ = $-$11.43$pm$0.01 mag and a size of 66.5$pm$17 pc, sharing the global properties of Ultra Compact Dwarf galaxies (UCDs) but significantly larger and brighter compared to the typical UCD populations observed in the Virgo cluster. By integrating the total luminosity of both the tidal stream and MATLAS-167, we estimate that the disrupted dwarf progenitor possesses a luminosity of M$_{g}$ = $-$15.92$pm$0.06 mag, a typical bright dE luminosity. With the help of the optical spectrum observed by the SDSS survey, we derive the simple stellar population properties of NGC 936_UCD: a light-weighted age of 5.6$pm$0.7 Gyr and metallicity of [Z/H] = $-$0.83$pm$0.3 dex. Our findings suggest that tidal threshing is a possible formation mechanism of bright UCD populations in close proximity to giant galaxies.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135745290","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

Tellurium emission line in kilonova AT 2017gfo 千新星at2017gfo中的碲发射谱线

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-09 DOI: 10.1093/mnrasl/slad128

Kenta Hotokezaka, Masaomi Tanaka, Daiji Kato, Gediminas Gaigalas

引用次数: 2

Correction to: Massive black hole binary systems and the NANOGrav 12.5 yr results 修正:大质量黑洞双星系统和nanogravity 12.5年的结果

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-09 DOI: 10.1093/mnrasl/slad087

H Middleton, A Sesana, S Chen, A Vecchio, W Del Pozzo, P A Rosado

引用次数: 0

A transient ultraviolet outflow in the short-period X-ray binary UW CrB 短周期x射线双星UW CrB中的瞬态紫外线流出

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-09 DOI: 10.1093/mnrasl/slad125

S Fijma, N Castro Segura, N Degenaar, C Knigge, N Higginbottom, J V Hernández Santisteban, T J Maccarone

{"title":"A transient ultraviolet outflow in the short-period X-ray binary UW CrB","authors":"S Fijma, N Castro Segura, N Degenaar, C Knigge, N Higginbottom, J V Hernández Santisteban, T J Maccarone","doi":"10.1093/mnrasl/slad125","DOIUrl":"https://doi.org/10.1093/mnrasl/slad125","url":null,"abstract":"ABSTRACT Accreting low-mass X-ray binaries (LMXBs) are capable of launching powerful outflows such as accretion disc winds. In disc winds, vast amounts of material can be carried away, potentially greatly impacting the binary and its environment. Previous studies have uncovered signatures of disc winds in the X-ray, optical, near-infrared, and recently even the ultraviolet (UV) band, predominantly in LMXBs with large discs (Porb ≥ 20 h). Here, we present the discovery of transient UV outflow features in UW CrB, a high-inclination (i ≥ 77°) neutron star LMXB (NS-LMXB) with an orbital period of only Porb ≈ 111 min. We present P-Cygni profiles identified for Si iv 1400 Å and tentatively for N v 1240 Å in one 15 min exposure, which is the only exposure covering orbital phase ϕ ≈ 0.7–0.8, with a velocity of ≈1500 km s−1. We show that due to the presence of blackbody emission from the neutron star surface and/or boundary layer, a thermal disc wind can be driven despite the short Porb, but explore alternative scenarios as well. The discovery that thermal disc winds may occur in NS-LMXBs with Porb as small as ≈111 min, and can potentially be transient on time-scales as short as ≈15 min, warrants further observational and theoretical work.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135745791","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

Ruling out strongly interacting Dark Matter–Dark Radiation models from joint observations of Cosmic Microwave Background and Quasar absorption spectra 从宇宙微波背景和类星体吸收光谱的联合观测中排除强相互作用的暗物质-暗辐射模型

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-07 DOI: 10.1093/mnrasl/slad193

Atrideb Chatterjee, Sourav Mitra, Amrita Banerjee

引用次数: 0