Article
Astronomy & Astrophysics
Alexander J. Richings, Claude-Andre Faucher-Giguere, Alexander B. Gurvich, Joop Schaye, Christopher C. Hayward
Summary: Investigating the importance of interstellar chemistry in galaxy formation, exploring the effects of local stellar radiation and metal depletion, and comparing simulation results with different modeling approaches to verify the accuracy of the models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
L. Vallini, A. Ferrara, A. Pallottini, S. Carniani, S. Gallerani
Summary: The study revealed that the observed [OIII]88μm/[CII]158μm surface brightness ratios in nine galaxies at z≈6-9 are primarily dependent on the 'burstiness' parameter, identifying starburst galaxies with short gas depletion times, with a secondary dependence on density, and weakly depending on gas metallicity. The galaxies are significantly enriched and dense, providing further support to the starburst scenario with rapid enrichment of the interstellar medium.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
I Beslic, A. T. Barnes, F. Bigiel, J. Puschnig, J. Pety, C. Herrera Contreras, A. K. Leroy, A. Usero, E. Schinnerer, S. E. Meidt, E. Emsellem, A. Hughes, C. Faesi, K. Kreckel, F. M. C. Belfiore, M. Chevance, J. S. den Brok, C. Eibensteiner, S. C. O. Glover, K. Grasha, M. J. Jimenez-Donaire, R. S. Klessen, J. M. D. Kruijssen, D. Liu, I Pessa, M. Querejeta, E. Rosolowsky, T. Saito, F. Santoro, A. Schruba, M. C. Sormani, T. G. Williams
Summary: This study presents new observations of high critical density molecular tracers towards the nearby strongly barred galaxy NGC 3627, revealing variations in the distribution of dense molecular gas across different galactic environments and a close relationship between dense gas dynamics and local enhancements in star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Roland Szakacs, Celine Peroux, Martin A. Zwaan, Dylan Nelson, Eva Schinnerer, Natalia Lahen, Simon Weng, Alejandra Y. Fresco
Summary: Observations and simulations show that there is a significant increase in the molecular gas mass density towards z≈2-3, indicating a change in the global distribution of molecular hydrogen column densities. The simulations broadly reproduce the observations, and an analytically modelled distribution based on exponential gas discs matches well with the simulations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ryan J. Farber, Max Gronke
Summary: Recent observations suggest that galaxies may have a molecular component in their circumgalactic medium. However, the structure and dynamics of the molecular circumgalactic medium are still poorly understood. This study uses simulations to explore the process of fragmentation and shattering of molecular clouds, finding that larger clouds can shatter into tiny droplets, and cold clouds can undergo a process of splintering. These findings have implications for understanding the molecular phase of the circumgalactic medium in observations and cosmological simulations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ryan J. Farber, Max Gronke
Summary: Recent progress has been made in understanding gas phases in the circumgalactic medium and galactic wind, particularly in relation to the origin and survival of the cold molecular phase, as well as the role of dust in the acceleration process.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Viviana Casasola, Simone Bianchi, Laura Magrini, Aleksandr Mosenkov, Francesco Salvestrini, Maarten Baes, Francesco Calura, Letizia P. Cassara, Christopher J. R. Clark, Edvige Corbelli, Jacopo Fritz, Frederic Galliano, Elisabetta Liuzzo, Suzanne Madden, Angelos Nersesian, Francesca Pozzi, Sambit Roychowdhury, Ivano Baronchelli, Matteo Bonato, Carlotta Gruppioni, Lara Pantoni
Summary: This study performs a homogeneous analysis of scaling relations between various components of galaxies, such as dust, gas, and gas-phase metallicity, as well as other properties like stellar mass and star-formation rate. The results show that these relations are influenced by local processes and galaxy peculiarities. The study also finds that the dust-total gas ratio shows a strong correlation at all scales, while the dust-H2 and dust-HI ratios have strong correlations at subkiloparsec/kiloparsec and total scales respectively.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Kaiyi Du, Yong Shi, Zhi-Yu Zhang, Qiusheng Gu, Tao Wang, Junzhi Wang, Xin Li, Sai Zhai
Summary: The study investigated the extended-Schmidt law in volume densities, finding smaller slopes and rms fluctuations compared to the volumetric Kennicutt-Schmidt law, and confirming the validity of the volumetric ES law in ultra-diffuse galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
R. Canameras, N. P. H. Nesvadba, R. Kneissl, S. Koenig, C. Yang, A. Beelen, R. Hill, E. Le Floc'h, D. Scott
Summary: The observations of high-density tracer molecules in three lensed dusty star-forming galaxies reveal comparable distributions of dense and diffuse gas reservoirs, ruling out major effects from differential lensing. The dense-gas excitation is characterized by high-density phases, with dense-gas mass fractions falling near the upper envelope of local ULIRGs. Despite higher gas fractions at high redshift, the dense-gas budget of rapidly star-forming galaxies seems to have evolved little between z similar to 3 and z similar to 0.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Shu Liu, Junzhi Wang, Fei Li, Jingwen Wu, Zhi-Yu Zhang, Di Li, Ningyu Tang, Pei Zuo
Summary: Spatial variations of optical depths have been detected in Galactic massive star-forming regions. In this study, we mapped 51 Galactic massive star-forming regions using the SMT telescope and obtained reliable measurements of spatially resolved optical depths for 30 regions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Lichen Liang, Robert Feldmann, Christopher C. Hayward, Desika Narayanan, Onur Catmabacak, Dusan Keres, Claude-Andre Faucher-Giguere, Philip F. Hopkins
Summary: The study explores the relationship between infrared excess and UV spectral slope in galaxies, finding that the galaxies in high-resolution cosmological simulations show a similar relation to observed nearby galaxies. It is suggested that variations in the intrinsic UV spectral slope are the primary driver of the scatter in the relationship.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
E. Bellocchi, M. Pereira-Santaella, L. Colina, A. Labiano, M. Sanchez-Garcia, A. Alonso-Herrero, S. Arribas, S. Garcia-Burillo, M. Villar-Martin, D. Rigopoulou, F. Valentino, A. Puglisi, T. Diaz-Santos, S. Cazzoli, A. Usero
Summary: This study presents new observations of CO(2-1) emissions in local luminous infrared galaxies (LIRGs) using ALMA. The results show that the molecular gas distribution in LIRGs is extremely compact, similar to early-type galaxies and smaller than local spiral galaxies. In contrast, high-redshift galaxies have larger molecular and stellar sizes.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Jordan N. Runco, Alice E. Shapley, Ryan L. Sanders, Mariska Kriek, Naveen A. Reddy, Alison L. Coil, Bahram Mobasher, Brian Siana, Michael W. Topping, William R. Freeman, Irene Shivaei, Mojegan Azadi, Sedona H. Price, Gene C. K. Leung, Tara Fetherolf, Laura de Groot, Tom Zick, Francesca M. Fornasini, Guillermo Barro
Summary: This study analyzes the completeness of the MOSDEF survey and compares a high signal-to-noise subsample with the full sample of star-forming galaxies. The results show similar emission-line properties and demonstrate that the MOSDEF survey is representative of the parent catalog.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Michael W. Topping, Alice E. Shapley, Ryan L. Sanders, Mariska Kriek, Naveen A. Reddy, Alison L. Coil, Bahram Mobasher, Brian Siana, William R. Freeman, Irene Shivaei, Mojegan Azadi, Sedona H. Price, Gene C. K. Leung, Tara Fetherolf, Laura de Groot, Tom Zick, Francesca M. Fornasini, Guillermo Barro, Jordan N. Runco
Summary: Analyzing galaxies at redshift z similar to 1.5, we found that the mass-metallicity relation (MZR) evolves differently depending on the calibration method used (N2 or O3N2), with a secondary dependence on star formation rate (SFR). The galaxies exhibit a correlation between metallicity and specific star formation rate (sSFR) offsets, suggesting the presence of a M-*-SFR-Z relation. This study also highlights the importance of accurate calibrations for understanding metallicity evolution with redshift.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Brittany N. Vanderhoof, A. L. Faisst, L. Shen, B. C. Lemaux, M. Bethermin, P. L. Capak, P. Cassata, O. Le Fevre, D. Schaerer, J. Silverman, L. Yan, M. Boquien, R. Gal, J. Kartaltepe, L. M. Lubin, M. Dessauges-Zavadsky, Y. Fudamoto, M. Ginolfi, N. P. Hathi, G. C. Jones, A. M. Koekemoer, D. Narayanan, M. Romano, M. Talia, D. Vergani, G. Zamorani
Summary: This article presents a study on 10 main-sequence ALPINE galaxies at a redshift of approximately 4.5. It analyzes the relationship between [O II] and star formation rate and interstellar medium properties. The results suggest a deviation from standard local descriptions and support a metal-dependent relation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Heidi A. White, Deanne B. Fisher, Roberto G. Abraham, Karl Glazebrook, Danail Obreschkow
Summary: This study presents a case study of stellar clumps in the G04-1 galaxy at z=0.13 using adaptive optics-enabled K-band imaging. The study identifies various stellar clumps with different masses, and these masses decrease by half after applying a light correction for the underlying stellar disk. The majority of the clumps have associated components in H alpha maps and show radial trends in their properties. The study also finds enhanced star formation in all regions of the galaxy. The observed clumps are not consistent with strong radiative feedback in this galaxy.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Jennifer A. Hardwick, Luca Cortese, Danail Obreschkow, Barbara Catinella, Robin H. W. Cook
Summary: We present a detailed study of the stellar mass versus specific angular momentum relation for a sample of 564 nearby galaxies. Our results show that the slope and scatter of the Fall relation vary when considering galaxy type and sample selection. The gas fraction is the most correlated parameter for low stellar masses, while the bulge-to-total ratio becomes more dominant at higher masses. Interestingly, when only the disc components of galaxies are considered, the gas fraction remains the most correlated parameter with the scatter of the relation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Shilpa Ranchod, Roger Deane, Danail Obreschkow, Tariq Blecher, Ian Heywood
Summary: This study explores the neutral hydrogen content of galaxies in three galaxy clusters and performs spectral-line stacking using MeerKAT observations. The results show no evidence of highly magnified H I emission within the intermediate redshift range. These pilot observations highlight the enormous potential of MeerKAT for future observations in dense environments and the intermediate-redshift Universe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
T. N. Reynolds, B. Catinella, L. Cortese, T. Westmeier, G. R. Meurer, L. Shao, D. Obreschkow, J. Roman, L. Verdes-Montenegro, N. Deg, H. Denes, B-Q For, D. Kleiner, B. S. Koribalski, K. Lee-Waddell, C. Murugeshan, S-H Oh, J. Rhee, K. Spekkens, L. Staveley-Smith, A. R. H. Stevens, J. M. van der Hulst, J. Wang, O. Wong, B. W. Holwerda, A. Bosma, J. P. Madrid, K. Bekki
Summary: In this study, the Hydra I cluster was observed and analyzed using WALLABY data, revealing the impact of galaxy environment on the removal of H I gas and the quenching of star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
William McDonald, Danail Obreschkow, Lilian Garratt-Smithson
Summary: This paper introduces a new dissociation index to compare the relationship between cold dark matter and gas in cosmic large-scale structures. The study finds that 90% of galaxy clusters have dark matter more elongated than gas, consistent with observations. Through simulations of colliding gaseous dark matter haloes, the details of dissociation process are further explored.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Bronwyn Reichardt Chu, Deanne B. Fisher, Alberto D. Bolatto, John Chisholm, Drummond Fielding, Danielle Berg, Alex J. Cameron, Karl Glazebrook, Rodrigo Herrera-Camus, Glenn G. Kacprzak, Laura Lenkic, Miao Li, Daniel K. McPherson, Nikole M. Nielsen, Danail Obreschkow, Ryan J. Rickards Vaught, Karin Sandstrom
Summary: We compared resolved observations of ionized and molecular gas on a scale of 500 pc for the starbursting disk galaxy IRAS08339+6517 at a redshift of z similar to 0.02, using measurements from KCWI and NOEMA. We investigated the relationship between star-formation-driven ionized gas outflows and colocated galaxy properties. Our findings suggest a linear relationship between the outflow mass flux and star formation rate surface density, as well as a strong correlation between the outflow mass flux and the gas depletion time. We also identified these outflows as breakout outflows based on the relationship between the gas fraction and disk kinematics.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Matthew J. Wilkinson, Aaron D. Ludlow, Claudia del P. Lagos, S. Michael Fall, Joop Schaye, Danail Obreschkow
Summary: Using idealized N-body simulations, we have investigated the impact of spurious heating of star particles by dark matter on the kinematics and morphology of galactic discs. We find that collisional heating leads to an increase in the velocity dispersion and a decrease in the mean velocities of stellar particles. The rate of heating is primarily determined by the number of dark matter particles and the radial gradients in the local density, regardless of the stellar particle mass. Galaxies with fewer than approximately 10^6 dark matter particles are particularly susceptible to spurious morphological evolution, leading to a transformation from flattened structures to rounder spheroidal systems with reduced rotational support.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Helene M. Courtois, Khaled Said, Jeremy Mould, T. H. Jarrett, Daniel Pomarede, Tobias Westmeier, Lister Staveley-Smith, Alexandra Dupuy, Tao Hong, Daniel Guinet, Cullan Howlett, Nathan Deg, Bi-Qing For, Dane Kleiner, Baerbel Koribalski, Karen Lee-Waddell, Jonghwan Rhee, Kristine Spekkens, Jing Wang, O. I. Wong, Frank Bigiel, Albert Bosma, Matthew Colless, Tamara Davis, Benne Holwerda, Igor Karachentsev, Renee C. Kraan-Korteweg, Kristen B. W. McQuinn, Gerhardt Meurer, Danail Obreschkow, Edward Taylor
Summary: The WALLABY pilot survey used ASKAP to form integrated 21-cm Hi line spectra in a different manner than traditional single-dish spectra Tully-Fisher measurements. It is crucial to quantify and understand slight differences in order to maximize the use of upcoming large-scale data. The pilot data consists of 614 galaxy spectra, with 472 of high enough quality for potential distance derivation using the Tully-Fisher relation. The resulting Tully-Fisher distances for the Eridanus, Hydra, Norma, and NGC4636 clusters are 21.5, 53.5, 69.4, and 23.0Mpc, respectively, with uncertainties of 5-10 percent.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Laura Lenkic, Alberto. D. D. Bolatto, Deanne. B. B. Fisher, Roberto Abraham, Karl Glazebrook, Rodrigo Herrera-Camus, Rebecca. C. C. Levy, Danail Obreschkow, Carolyn. G. G. Volpert
Summary: Using ALMA observations, the line ratios of CO(3-2) and CO(4-3) were characterized in local analogues of main-sequence galaxies at z similar to 1-2. The study found that the CO(4-3)/CO(3-2) line ratio of these galaxies is higher than previous estimates and consistent with their resemblance to main-sequence galaxies at z similar to 1-2. The relation between star formation rate surface density and CO line ratios was investigated, showing deviations from model predictions at lower star formation rate surface densities.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Ajay Dev, Simon P. Driver, Martin Meyer, Sambit Roychowdhury, Jonghwan Rhee, Adam R. H. Stevens, Claudia del P. Lagos, Joss Bland-Hawthorn, Barbara Catinella, A. M. Hopkins, Jonathan Loveday, Danail Obreschkow, Steven Phillipps, Aaron S. G. Robotham
Summary: In this study, we determine the relation between atomic hydrogen (HI) and halo mass using data from the Arecibo Legacy Fast ALFA survey at the location of optically selected groups from the Galaxy And Mass Assembly (GAMA) survey. We find that the HI mass of the groups generally increases with halo mass, ranging from 1.3% at 10^11.6 solar masses to 0.4% at 10^13.7 solar masses. Our results are consistent with previous studies and mock observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
W. H. Morgan, J. Khoo, A. Vukmirovic, A. Abdul-Rahman, D. An, A. Mehnert, D. Obreschkow, E. Chowdhury, D. Y. Yu
Summary: Spaceflight associated neuro-ocular syndrome (SANS) is common in astronauts on long duration space missions and is associated with elevated cerebrospinal fluid (CSF) pressure. A retinal photoplethysmographic technique has been developed to non-invasively measure CSF pressure. Testing the system on healthy volunteers showed a significant relationship between pulsation amplitude change and estimated CSF pressure change, indicating the potential use of this technique for monitoring CSF pressure during long-term space voyages.
Article
Biology
Anmar Abdul-Rahman, William Morgan, Aleksandar Vukmirovic, Andrew Mehnert, Danail Obreschow, Dao-Yi Yu
Summary: Using high-speed modified photoplethysmography, this study measured the retinal venous pulse wave velocity. A harmonic regression model was fitted to each pixel in the time series of the optic nerve video, allowing quantification of the retinal vascular pulse wave parameters. The observation of retinal venous pulsation showed complex dynamic wall motion, with contraction beginning at a point at the center of the optic disc and progressing centrifugally. The estimated retinal venous pulse wave velocity at this segment was approximately 22.24694 mm/s, providing a reference for future studies.
BMC RESEARCH NOTES
(2023)
Article
Astronomy & Astrophysics
M. Arabsalmani, L. Garratt-Smithson, N. Wijers, J. Schaye, A. Burkert, C. D. P. Lagos, E. Le Floc'h, D. Obreschkow, C. Peroux, B. Schneider
Summary: We investigate the relationship between the metallicities of ionized and atomic gas in star-forming galaxies using the EAGLE cosmological simulations. We find that the metallicities of ionized gas are generally higher than those of atomic gas, and the difference increases with decreasing metallicity. The positions of the sight lines with respect to the galaxy centers play a significant role, as the difference between the metallicities decreases towards the center and saturates to a minimum value. The mixing of the two gas phases is most efficient in the central regions of galaxies.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Annagrazia Puglisi, Ugne Dudzeviciute, Mark Swinbank, Steven Gillman, Alfred L. Tiley, Richard G. Bower, Michele Cirasuolo, Luca Cortese, Karl Glazebrook, Chris Harrison, Edo Ibar, Juan Molina, Danail Obreschkow, Kyle A. Oman, Matthieu Schaller, Francesco Shankar, Ray M. Sharples
Summary: We present the first results from the KMOS Ultra-deep Rotation Velocity Survey (KURVS), which examines the outer rotation curves and dark matter content of 22 star-forming galaxies at z similar to 1.5. Using Hα emission, we analyze individual rotation curves to a radius of 4 times the effective radius, finding that most curves are flat or rising between three and six disc scale radii. Our measurements suggest a declining dark matter fraction with increasing stellar mass and stellar mass surface density. The tension with high stellar mass surface density observations indicates a need to reassess baryonic processes in the most massive galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Aaron D. Ludlow, S. Michael Fall, Matthew J. Wilkinson, Joop Schaye, Danail Obreschkow
Summary: This study uses cosmological simulations to investigate the impact of spurious heating of stellar motions within simulated galaxies by dark matter particles. The results show that spurious heating affects the distribution and kinematics of stellar and DM particles, but has little effect on galaxy properties such as mass and star formation histories.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)