Article
Astronomy & Astrophysics
F. Mannucci, F. Belfiore, M. Curti, G. Cresci, R. Maiolino, A. Marasco, A. Marconi, M. Mingozzi, G. Tozzi, A. Amiri
Summary: The diffuse ionized gas has an impact on the nebular emission of galaxies, but the effect may be lower than previously assumed, and aperture effects play a significant role in observed differences. Correction may be needed in observed data to recover the genuine contribution from H II regions, and this has implications for measuring metallicity using strong-line methods.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
A. S. Gusev, A. Dodin
Summary: Spectroscopic observations of Hii regions were conducted in galaxies NGC 3963 and NGC 7292, revealing peculiarities in chemical abundance distributions potentially explained by external gas accretion and major merging processes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
A. Amayo, G. Delgado-Inglada, G. Stasinska
Summary: New ionization correction factors (ICFs) for carbon, nitrogen, neon, sulfur, chlorine, and argon in giant Hii regions were provided in this study. The ICFs were computed using representative photoionization models from a large initial grid, and were used to calculate abundances of nitrogen, neon, sulfur, and argon in samples. Oxygen depletion into dust grains at a rate increasing with metallicity was found, and the discussion on possible depletion of sulfur and argon requires consideration of recent Type Ia Supernova yields, which are uncertain.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Estrella Florido, Almudena Zurita, Enrique Perez-Montero
Summary: This study uses a sample of 536 H ii regions in nearby spiral galaxies to obtain new empirical calibrations of several strong-line indices to estimate nitrogen-to-oxygen abundance ratio. The study shows strong correlations between all indices and log (N/O) based on T-e, even stronger than with 12 + log (O/H). N2O2 is the most strongly correlated index, and a second-order polynomial provides the best fit to the log (N/O)-N2O2 relation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
P. Vermot, B. Barna, S. Ehlerova, M. R. Morris, J. Palous, R. Wunsch
Summary: By observing and comparing three regions of NGC 1068, researchers found that they have similar characteristics and belong to the same class of objects. They also determined that these regions are where the jet from the active galactic nucleus impacts massive molecular clouds.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
D. Haasler, V. M. Rivilla, S. Martin, J. Holdship, S. Viti, N. Harada, J. Mangum, K. Sakamoto, S. Muller, K. Tanaka, Y. Yoshimura, K. Nakanishi, L. Colzi, L. Hunt, K. L. Emig, R. Aladro, P. Humire, C. Henkel, P. van der Werf
Summary: The study detected phosphorus nitride (PN) outside the Milky Way for the first time towards two giant molecular clouds of NGC 253, with abundance ratios and excitation temperatures calculated through LTE and non-LTE analyses. The findings suggest a possible shock-driven chemistry and cosmic-ray-driven photochemistry explanation for the presence of PN in NGC 253.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Mabel Valerdi, Antonio Peimbert, Manuel Peimbert
Summary: The study conducted a long-slit spectrophotometry analysis of chemical abundances in metal-poor HII regions of three galaxies, deriving physical conditions and abundances of various elements. The analysis also involved using the t(2) formalism and He recombination line intensity ratios to estimate the abundance of Helium. Additionally, the study estimated the primordial helium abundance by mass and found it to align with values from Big Bang Nucleosynthesis and recent determinations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. Zamora, Angeles Diaz, Elena Terlevich, Vital Fernandez
Summary: This article presents a method to calculate extinction corrections based on weaker lines of He I and applies it to the study of the 30 Doradus nebula. The comparison between helium and hydrogen determinations of c(H beta) yields compatible results within the errors, and using both sets of lines simultaneously significantly reduces the error in the derivation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. E. Mendez-Delgado, C. Esteban, J. Garcia-Rojas, K. Z. Arellano-Cordova, K. Kreckel, V Gomez-Llanos, O. Egorov, M. Peimbert, M. Orte-Garcia
Summary: We have conducted a study based on the DEep Spectra of Ionized REgions Data base (DESIRED). This database comprises 190 high signal-to-noise ratio optical spectra of H II regions and other photoionized nebulae, in which about 29,380 emission lines are found. Our analysis reveals that the electron density (-n(e)-) of the objects is underestimated when only [S II]λ 6731/λ 6716 and/or [O II]λ 3726/λ 3729 are used as density indicators due to the non-linear density dependence. This underestimation has implications for the analysis of infrared fine structure lines and the resulting ionic abundances.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Benjamin Metha, Michele Trenti, Tingjin Chu, Andrew Battisti
Summary: This study introduces the geostatistical technique of universal kriging to reconstruct the complete 2D metallicity distribution of a galaxy from metallicities measured at H ii regions. High-fidelity metallicity maps of the local spiral galaxy NGC 5236 are constructed and significant correlation in the metallicity of H ii regions is found. The predictions of this method outperform interpolation based on metallicity gradients. The kriging method is also applied to predict metallicities in regions dominated by diffuse ionized gas emission, and comparisons with novel ionization corrections show a systematic offset and scatter.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Y. D. Mayya, J. A. Alzate, L. Lomeli-Nuez, J. Zaragoza-Cardiel, V. M. A. Gomez-Gonzalez, S. Silich, D. Fernandez-Arenas, O. Vega, P. A. Ovando, L. H. Rodriguez, D. Rosa-Gonzalez, A. Luna, M. Zamora-Aviles, F. Rosales-Ortega
Summary: In this study, we investigate the properties of a kiloparsec-size superbubble in the late-type spiral galaxy NGC 628. This superbubble, located in the interarm region, is the largest among several holes observed with JWST/MIRI filters. The expanding shell of the superbubble contains a significant amount of gas in molecular form and has a population of excess blue, bright stars formed over the last 50 Myr.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Valerdi, J. K. Barrera-Ballesteros, S. F. Sanchez, C. Espinosa-Ponce, L. Carigi, A. Mejia-Narvaez
Summary: By calibrating the emission line flux ratio, the study investigates the abundance of helium and explores its variations in different galaxies through a large sample of H II regions. The observed trends suggest a consistency between the change in helium abundance with respect to oxygen abundance and the chemical enrichment with mass/oxygen abundance.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
C. Eibensteiner, A. T. Barnes, F. Bigiel, E. Schinnerer, D. Liu, D. S. Meier, A. Usero, A. K. Leroy, E. Rosolowsky, J. Puschnig, I Lazar, J. Pety, L. A. Lopez, E. Emsellem, I Beslic, M. Querejeta, E. J. Murphy, J. den Brok, A. Schruba, M. Chevance, S. C. O. Glover, Y. Gao, K. Grasha, H. Hassani, J. D. Henshaw, M. J. Jimenez-Donaire, R. S. Klessen, J. M. D. Kruijssen, H-A Pan, T. Saito, M. C. Sormani, Y-H Teng, T. G. Williams
Summary: This study presents new observations of molecular line emission in the central region of the double-barred spiral galaxy NGC 6946. The results show that HCO+ is highly correlated with the star formation rate surface density, but the behaviors of the dense gas fraction and star formation efficiency of the dense gas differ from expectations based on large-scale disc observations. Line ratio diagnostics reveal differences between different regions. Additionally, the study suggests that using the HCN/HNC ratio to probe kinetic temperatures is not suitable on kiloparsec and sub-kiloparsec scales, and the HCO+/HCN ratio might not be a unique indicator of AGN activity in galaxies.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Anastasiya D. Yarovova, Oleg Egorov, Alexei Moiseev, Olga Maryeva
Summary: We discovered an unusual emission-line stellar-like object in the low-metallicity dwarf galaxy NGC 4068, characterized by high velocity dispersion, the presence of He II lambda 4686 angstrom line, and peculiarly low [S II]/[N II] fluxes ratio. Our observations suggest that this object is a single star with high bolometric luminosity surrounded by an expanding nebula. The peculiar nitrogen overabundance in the nebula indicates interaction between the star's ejecta and the interstellar medium, possibly a massive blue supergiant or Wolf-Rayet star.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Bethan Easeman, Patricia Schady, Stijn Wuyts, Robert M. Yates
Summary: Radial metallicity trends provide important indicators of certain physical processes within a galaxy. This paper investigates the central dips in metallicity observed in galaxies and explores whether these are genuine decreases or artifacts of the diagnostic used. The study finds no clear evidence that the dips are caused by changing values of the ionization parameter within galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. Mehner, K. Davidson, R. M. Humphreys, F. M. Walter, D. Baade, W. J. de Wit, J. Martin, K. Ishibashi, T. Rivinius, C. Martayan, M. T. Ruiz, K. Weis
ASTRONOMY & ASTROPHYSICS
(2015)
Article
Multidisciplinary Sciences
B. Macintosh, J. R. Graham, T. Barman, R. J. De Rosa, Q. Konopacky, M. S. Marley, C. Marois, E. L. Nielsen, L. Pueyo, A. Rajan, J. Rameau, D. Saumon, J. J. Wang, J. Patience, M. Ammons, P. Arriaga, E. Artigau, S. Beckwith, J. Brewster, S. Bruzzone, J. Bulger, B. Burningham, A. S. Burrows, C. Chen, E. Chiang, J. K. Chilcote, R. I. Dawson, R. Dong, R. Doyon, Z. H. Draper, G. Duchene, T. M. Esposito, D. Fabrycky, M. P. Fitzgerald, K. B. Follette, J. J. Fortney, B. Gerard, S. Goodsell, A. Z. Greenbaum, P. Hibon, S. Hinkley, T. H. Cotten, L-W. Hung, P. Ingraham, M. Johnson-Groh, P. Kalas, D. Lafreniere, J. E. Larkin, J. Lee, M. Line, D. Long, J. Maire, F. Marchis, B. C. Matthews, C. E. Max, S. Metchev, M. A. Millar-Blanchaer, T. Mittal, C. V. Morley, K. M. Morzinski, R. Murray-Clay, R. Oppenheimer, D. W. Palmer, R. Patel, M. D. Perrin, L. A. Poyneer, R. R. Rafikov, F. T. Rantakyroe, E. L. Rice, P. Rojo, A. R. Rudy, J-B. Ruffio, M. T. Ruiz, N. Sadakuni, L. Saddlemyer, M. Salama, D. Savransky, A. C. Schneider, A. Sivaramakrishnan, I. Song, R. Soummer, S. Thomas, G. Vasisht, J. K. Wallace, K. Ward-Duong, S. J. Wiktorowicz, S. G. Wolff, B. Zuckerman
Article
Astronomy & Astrophysics
A. Mehner, K. Davidson, R. M. Humphreys, F. M. Walter, D. Baade, W. J. de Wit, J. Martin, K. Ishibashi, T. Rivinius, C. Martayan, M. T. Ruiz, K. Weis
ASTRONOMY & ASTROPHYSICS
(2015)
Article
Astronomy & Astrophysics
Sonia Duffau, A. Katherina Vivas, Robert Zinn, Rene A. Mendez, Maria T. Ruiz
ASTRONOMY & ASTROPHYSICS
(2014)
Article
Astronomy & Astrophysics
A. Brucalassi, L. Pasquini, R. Saglia, M. T. Ruiz, P. Bonifacio, L. R. Bedin, K. Biazzo, C. Melo, C. Lovis, S. Randich
ASTRONOMY & ASTROPHYSICS
(2014)
Article
Astronomy & Astrophysics
A. Perez Garrido, N. Lodieu, V. J. S. Bejar, M. T. Ruiz, B. Gauza, R. Rebolo, M. R. Zapatero Osorio
ASTRONOMY & ASTROPHYSICS
(2014)
Article
Astronomy & Astrophysics
S. N. Flores-Duran, M. Pena, L. Hernandez-Martinez, J. Garcia-Rojas, M. T. Ruiz
ASTRONOMY & ASTROPHYSICS
(2014)
Article
Astronomy & Astrophysics
N. Lodieu, A. Perez-Garrido, V. J. S. Bejar, B. Gauza, M. T. Ruiz, R. Rebolo, D. J. Pinfield, E. L. Martin
ASTRONOMY & ASTROPHYSICS
(2014)
Article
Astronomy & Astrophysics
A. C. Day-Jones, F. Marocco, D. J. Pinfield, Z. H. Zhang, B. Burningham, N. Deacon, M. T. Ruiz, J. Gallardo, H. R. A. Jones, P. W. L. Lucas, J. S. Jenkins, J. Gomes, S. L. Folkes, J. R. A. Clarke
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2013)
Article
Astronomy & Astrophysics
D. J. Pinfield, J. Gomes, A. C. Day-Jones, S. K. Leggett, M. Gromadzki, B. Burningham, M. T. Ruiz, R. Kurtev, T. Cattermole, C. Cardoso, N. Lodieu, J. Faherty, S. Littlefair, R. Smart, M. Irwin, J. R. A. Clarke, L. Smith, P. W. Lucas, M. C. Galvez-Ortiz, J. S. Jenkins, H. R. A. Jones, R. Rebolo, V. J. S. Bejar, B. Gauza
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2014)
Article
Astronomy & Astrophysics
D. J. Pinfield, M. Gromadzki, S. K. Leggett, J. Gomes, N. Lodieu, R. Kurtev, A. C. Day-Jones, M. T. Ruiz, N. J. Cook, C. V. Morley, M. S. Marley, F. Marocco, R. L. Smart, H. R. A. Jones, P. W. Lucas, Y. Beletsky, V. D. Ivanov, B. Burningham, J. S. Jenkins, C. Cardoso, J. Frith, J. R. A. Clarke, M. C. Galvez-Ortiz, Z. Zhang
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2014)
Article
Astronomy & Astrophysics
G. Altavilla, S. Marinoni, E. Pancino, S. Galleti, M. Bellazzini, N. Sanna, M. Rainer, G. Tessicini, J. M. Carrasco, A. Bragaglia, W. J. Schuster, G. Cocozza, M. Gebran, H. Voss, L. Federici, E. Masana, C. Jordi, M. Monguio, A. Castro, M. A. Pena-Guerrero, A. Perez-Villegas
Summary: This study presents BVRI photometry of candidate spectrophotometric standard stars for the external flux calibration of Gaia data. The data were used to calibrate the first two Gaia releases, with an overall agreement of about 1% accuracy across various samples and techniques. The Gaia photometric precision is currently at the order of 0.1%, prompting discussions on improving photometric calibration accuracy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Proceedings Paper
Engineering, Aerospace
Charles D. Keyes, Tracy L. Beck, Maria Pena-Guerrero, Catarina Alves de Oliveira, Pierre Ferruit, Peter Jakobsen, Giovanna Giardino, Marco Sirianni, Torsten Boeker, Stephan Birkmann, Charles Proffitt
OBSERVATORY OPERATIONS: STRATEGIES, PROCESSES, AND SYSTEMS VII
(2018)
Article
Astronomy & Astrophysics
Maria A. Pena-Guerrero, Claus Leitherer, Selma de Mink, Aida Wofford, Lisa Kewley
ASTROPHYSICAL JOURNAL
(2017)
Article
Astronomy & Astrophysics
J. R. Rigby, M. B. Bayliss, M. D. Gladders, K. Sharon, E. Wuyts, H. Dahle, T. Johnson, M. Pena-Guerrero
ASTROPHYSICAL JOURNAL LETTERS
(2015)