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Variation of the molecular cloud lifecycle across the nearby galaxy population 分子云生命周期在邻近星系群中的变化
Proceedings of the International Astronomical Union Pub Date : 2021-08-01 DOI: 10.1017/S1743921322003738
Jaeyeon Kim, M. Chevance, J. M. Diederik Kruijssen, A. Leroy
{"title":"Variation of the molecular cloud lifecycle across the nearby galaxy population","authors":"Jaeyeon Kim, M. Chevance, J. M. Diederik Kruijssen, A. Leroy","doi":"10.1017/S1743921322003738","DOIUrl":"https://doi.org/10.1017/S1743921322003738","url":null,"abstract":"Abstract The processes of star formation and feedback take place on the scales of giant molecular clouds (GMCs; ~ 100 pc) within galaxies and play a major role in governing galaxy evolution. By applying a robust statistical method to PHANGS observations, we systematically measure the evolutionary timeline from molecular clouds to exposed young stellar regions, across an unprecedented sample of 54 galaxies. These timescales depend on galaxy environment, revealing the role of galactic-scale dynamical processes in the small-scale GMC evolution. Furthermore, in the 5 nearest galaxies of our sample, we have refined the GMC timeline further and established the duration of the heavily obscured phase, using 24 μm emission. These results represent a major first step towards a comprehensive picture of cloud assembly and feedback, which will be extended to 19 more galaxies with our ongoing JWST Large Program.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"1 1","pages":"299 - 305"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75532684","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 density structure of molecular cloud scales: A fitting for N-PDF with multi log-normal functions 分子云尺度的密度结构:N-PDF的多对数正态函数拟合
Proceedings of the International Astronomical Union Pub Date : 2021-08-01 DOI: 10.1017/S1743921322004379
T. Murase, T. Handa, Ren Matsusaka, Y. Shimajiri, Masato I. N. Kobayashi, M. Kohno, J. Nishi, N. Takeba, Yosuke Shibata
{"title":"The density structure of molecular cloud scales: A fitting for N-PDF with multi log-normal functions","authors":"T. Murase, T. Handa, Ren Matsusaka, Y. Shimajiri, Masato I. N. Kobayashi, M. Kohno, J. Nishi, N. Takeba, Yosuke Shibata","doi":"10.1017/S1743921322004379","DOIUrl":"https://doi.org/10.1017/S1743921322004379","url":null,"abstract":"Abstract We studied the probability distribution function of the column density (N-PDF) of molecular clouds based on a fit with a multi-log-normal function using the Nobeyama 45-m Cygnus X CO survey data. We identified 124 molecular clouds in 13CO data using the DENDROGRAM and SCIMES algorithms. The N-PDF was constructed for 11 extended (≥ 0.4 deg2) molecular clouds of these identified clouds. We found that every N-PDF is well-fitted with one or two log-normal (LN) distributions. We investigated the distributions of the column density, C18O dense cores, and radio continuum source in each cloud and found that the N-PDF was less correlated with the star-forming activity. The LN N-PDF parameters showed two impressive features. First, the LN distribution at the low-density part had the same mean column density (∼1021.5 cm−2 ) for almost all the molecular clouds. Second, the wider LN distribution tended to show the lower mean density of the structures.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"220 1","pages":"45 - 48"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75622281","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
IAU volume 17 issue 373 Cover and Back matter 国际天文学联合会第17卷第373期封面和封底
Proceedings of the International Astronomical Union Pub Date : 2021-08-01 DOI: 10.1017/s1743921323000431
Gómez Medina, H. Golshan
{"title":"IAU volume 17 issue 373 Cover and Back matter","authors":"Gómez Medina, H. Golshan","doi":"10.1017/s1743921323000431","DOIUrl":"https://doi.org/10.1017/s1743921323000431","url":null,"abstract":"","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"363 1","pages":"b1 - b4"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73476809","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
Parsec scale CO depletion in KAGONMA 71, or a star-forming filament in CMa OB1 在KAGONMA 71中秒差距尺度的CO耗尽，或者在CMa OB1中形成恒星的灯丝
Proceedings of the International Astronomical Union Pub Date : 2021-08-01 DOI: 10.1017/S1743921322004926
T. Handa, Y. Hirata, T. Murase, J. Nishi, Y. Shimajiri, T. Omodaká, M. Nakano, K. Sunada, T. Ito, J. Chibueze
{"title":"Parsec scale CO depletion in KAGONMA 71, or a star-forming filament in CMa OB1","authors":"T. Handa, Y. Hirata, T. Murase, J. Nishi, Y. Shimajiri, T. Omodaká, M. Nakano, K. Sunada, T. Ito, J. Chibueze","doi":"10.1017/S1743921322004926","DOIUrl":"https://doi.org/10.1017/S1743921322004926","url":null,"abstract":"Abstract The depletion of CO molecules is observed in infrared dark clouds. However, only few exsamples are found in pc-scale. An NH3 emission is one of good counter parts of C18O because of similar effective critical density. Our NH3 observations of a molecular filament associated with CMa OB1 or KAG 71, which is a target of Kagoshima Galactic Object survey with Nobeyama 45-m telescope by Mapping in Ammonia lines (KAGONMA) project. Although NH3 data shows similarity in morphology with infrared data suggesting no depletion, C18O in the clumps 4 and 6 are weaker than expected based on NH3 data. After examining the dissipation of the high-density gas, photodissociation, and depletion, we concluded that CO is depleted at least in the clump 4. It is a new example of depletion in pc-scale.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"55 1","pages":"31 - 34"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83919017","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
SWAG: The Maps SWAG:地图
Proceedings of the International Astronomical Union Pub Date : 2021-08-01 DOI: 10.1017/S1743921323000182
J. Ott, David S. Meier, T. Candelaria, D. Ward
{"title":"SWAG: The Maps","authors":"J. Ott, David S. Meier, T. Candelaria, D. Ward","doi":"10.1017/S1743921323000182","DOIUrl":"https://doi.org/10.1017/S1743921323000182","url":null,"abstract":"Abstract We present maps of the “Survey of Water and Ammonia toward the Galactic center” (SWAG). SWAG was observed over three years (∼550 h) with the Australia Telescope Compact Array (ATCA) and covers the entire Central Molecular Zone (CMZ) at about 26” or ∼1 pc resolution. The observed 21.2–25.6 GHz range contains tens of spectral lines and 4 GHz of continuum. Here, we present some final maps. These include multiple NH3 lines, radio recombination lines, shock tracers like HNCO and methanol (CH3OH), high resolution 22 GHz water masers, and a continuum map. The maps are the foundation for ongoing comprehensive temperature mapping of the CMZ, including the identification of heating mechanisms, the characterization of water maser sources as young stellar objects or AGB stars, as well as chemistry, dynamics, and star formation studies of the ISM in this unique environment.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"237 1","pages":"52 - 55"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72850476","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
Feedback models in galaxy simulations and probing their impact by cosmological hydrodynamic simulations 星系模拟中的反馈模型及其对宇宙流体力学模拟的影响
Proceedings of the International Astronomical Union Pub Date : 2021-08-01 DOI: 10.1017/S1743921323000133
K. Nagamine
{"title":"Feedback models in galaxy simulations and probing their impact by cosmological hydrodynamic simulations","authors":"K. Nagamine","doi":"10.1017/S1743921323000133","DOIUrl":"https://doi.org/10.1017/S1743921323000133","url":null,"abstract":"Abstract Feedback effects by supernovae (SNe) and active galactic nuclei (AGNs) are believed to be essential for galaxy evolution and shaping present-day galaxies, but their exact mechanisms on galactic scales and their impact on CGM/IGM are not well understood yet. In galaxy formation simulations, it is still challenging to resolve sub-parsec scales, and we need to implement subgrid models to account for the physics on small scales. In this article, we summarize some of the efforts to build more physically based feedback models, discuss about pushing the resolution to its limits in galaxy simulations, testing galaxy formation codes under the AGORA code comparison project, and how to probe the impact of feedback using cosmological hydrodynamic simulations via Lyα absorption and CGM/IGM tomography technique. We also discuss our future directions of research in this field and how we make progress by comparing our simulations with observations.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"511 1","pages":"283 - 292"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77008368","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
Milky Way: structure via live potentials 银河系:通过活电位的结构
Proceedings of the International Astronomical Union Pub Date : 2021-08-01 DOI: 10.1017/S1743921322004902
Eva Durán-Camacho, A. Duarte-Cabral
{"title":"Milky Way: structure via live potentials","authors":"Eva Durán-Camacho, A. Duarte-Cabral","doi":"10.1017/S1743921322004902","DOIUrl":"https://doi.org/10.1017/S1743921322004902","url":null,"abstract":"Abstract We use the AREPO numerical code to model the structure of a Milky Way like galaxy (MW) via a suite of simulations composed of a stellar disc and bulge, a dark matter halo, and a gaseous disc under isothermal conditions. For each model, we produce longitude velocity (l-v) maps of the gas surface densities to extract the skeletons of the main features (arms, bar), and the contours defining the terminal velocities of the gas. We compare these with observations via a number of diagnostic tools, and select the model that best reproduces the main observed features of the Milky Way.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"45 1","pages":"28 - 30"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85970404","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 Progressive Integral Step Method (PrISM) for Wide Field 3D Spectral Imaging of Nearby Galaxies: an Overview of the TYPHOON Survey 近星系宽视场三维光谱成像的渐进式积分阶跃法(PrISM):台风巡天综述
Proceedings of the International Astronomical Union Pub Date : 2021-08-01 DOI: 10.1017/S174392132200429X
K. Grasha
{"title":"The Progressive Integral Step Method (PrISM) for Wide Field 3D Spectral Imaging of Nearby Galaxies: an Overview of the TYPHOON Survey","authors":"K. Grasha","doi":"10.1017/S174392132200429X","DOIUrl":"https://doi.org/10.1017/S174392132200429X","url":null,"abstract":"Abstract The TYPHOON program is producing an atlas of spectroscopic data cubes of 44 large-angular-sized galaxies with complete spatial coverage from 3650–9000 Å. This survey provides an unparalleled opportunity to study variations in the interstellar medium (ISM) properties within individual H ii regions across the entire star-forming disks of nearby galaxies. This can provide key insights into the spatial distribution and resolved properties of the ISM to understand how efficiently metals are mixed and redistributed across spirals and dwarf galaxies. In this Proceeding, we present early science results from six nearby spiral galaxies as part of the TYPHOON program from Grasha et al. (2022). We use HIIPhot to identify the H ii regions within the galaxy based on the surface brightness of the Hα emisison line and measure variations of the H ii region oxygen abundance. In this initial work, we find that while the spiral pattern plays a role in organizing the ISM, it alone does not establish the relatively uniform azimuthal variations we observe across all the galaxies. Differences in the metal abundances are more likely driven by the strong correlations with the local physical conditions. We find a strong and positive correlation between the ionization parameter and the local abundances as measured by the relative metallicity offset Δ(O/H), indicating a tight relationship between local physical conditions and their localized enrichment of the ISM. These variations can be explained by a combination of localized, star formation-driven self-enrichment and large-scale mixing-driven dilution due to the passing of spiral density waves.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"52 1","pages":"234 - 241"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87638589","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
High [OIII] luminosities from star formation and shocks in z∼6 quasars z ~ 6类星体中恒星形成和激波的高[OIII]光度
Proceedings of the International Astronomical Union Pub Date : 2021-08-01 DOI: 10.1017/S1743921322003787
Bomee Lee, R. Chary
{"title":"High [OIII] luminosities from star formation and shocks in z∼6 quasars","authors":"Bomee Lee, R. Chary","doi":"10.1017/S1743921322003787","DOIUrl":"https://doi.org/10.1017/S1743921322003787","url":null,"abstract":"Abstract We use archival WISE and Spitzer photometry to derive optical emission line fluxes for a sample of distant quasars at z∼6. We find evidence for exceptionally high equivalent width [OIII] emission (rest-frame EW∼400Å) similar to that inferred for star-forming galaxies at similar redshifts. The median Hα and Hβ equivalent widths are derived to be ∼400Å and ∼100Å respectively, and are consistent with values seen among quasars in the local Universe, and at z ∼ 2. After accounting for the contribution of photoionization in the broad line regions of quasars, we suggest that the narrow [OIII] emission likely arises from feedback due to massive star-formation in the quasar host. Forthcoming mid-infrared spectroscopy with the James Webb Space Telescope will help constrain the physical conditions in quasar hosts further.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"22 1","pages":"256 - 259"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91182330","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
IAU volume 17 issue 370 Cover and Front matter 国际天文学联合会第17卷第370期封面和封面问题
Proceedings of the International Astronomical Union Pub Date : 2021-08-01 DOI: 10.1017/s1743921323001011
A. Vidotto, L. Fossati, J. Vink
{"title":"IAU volume 17 issue 370 Cover and Front matter","authors":"A. Vidotto, L. Fossati, J. Vink","doi":"10.1017/s1743921323001011","DOIUrl":"https://doi.org/10.1017/s1743921323001011","url":null,"abstract":"","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"52 1","pages":"f1 - f14"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81834957","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
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