Electron density in giant H II regions
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Caicedo Ortiz, H. E., & Castañeda-Fernández, H. O. . (2021). Electron density in giant H II regions. Revista De La Academia Colombiana De Ciencias Exactas, Físicas Y Naturales, 45(177), 989–1010. https://doi.org/10.18257/raccefyn.1464

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Abstract

The electron density on a global and point-to-point scale of Hubble V and Hubble X giant H II regions, located in the galaxy NGC 6822, was studied using long-slit spectroscopy in the visible spectrum. The results obtained present for the first time a measure of the spatial variation of the electron density of these two giant h II regions, showing that they have an inhomogeneous behavior in their density at the local level as well as a low-density regime at the global level, and verifying that the electronic temperature has a low incidence in its determination.

https://doi.org/10.18257/raccefyn.1464

Keywords

Electron density | Giant HII Regions | NGC 6822 | Hubble V | Hubble X
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References

Aller, L. H. (1984). Physics of thermal gaseous nebulae (Vol. 112). Springer; 1 edición.

Bianchi, L., Scuderi, S., Massey, P., y Romaniello, M. (2001). The Massive Star Content of NGC 6822: Ground-Based, Hubble Space Telescope Photometry. AJ, 121, 2020-2031. doi: 10.1086/319969

Brandenburg, H. J., y Skillman, E. D. (1998). The Neutral Hydrogen in NGC 6822. En American astronomical society meeting abstracts (Vol. 30, p. 1354).

Caicedo-Ortiz, H. E., Santiago-Cortes, E., López-Bonilla, J., y Castañeda, H. O. (2015). Fractal dimension and turbulence in Giant HII Regions. Journal of Physics Conference Series, 582, 012049. doi: 10.1088/1742-6596/582/1/012049

Caicedo-Ortiz, H. E. (2011). Estudio de Regiones HII Gigantes (Tesis de Master no publicada). Instituto Politécnico Nacional (IPN), México.

Caicedo-Ortiz, H. E., Castañeda, H. O., y Santiago-Cortés, E. (2017). Fractalidad en regiones de Formación Estelar. Revista Brasileira de Ensino de Física, 39 3, e3308-1- e3308-8. doi: 10.1590/1806-9126-rbef-2017-0006

Caicedo-Ortiz, H. E., y Castañeda Fernández, H. O. (2019). Relationship Between the Ionization Energy and the Radial Velocity of the Ionized Gas in Gaseous Nebulae. Astrophysics, 62 (1), 57-68. doi: 10.1007/s10511-019-09564-9

Campbell-White, J., Ali, A. A., Froebrich, D., y Kume, A. (2020). Shape analysis of h ii regions–ii. synthetic observations. MNRAS, 496 4, 4311–4329.

Cannon, J. M., Walter, F., Armus, L., Bendo, G. J., Calzetti, D., Draine, B. T., . . . Thornley, M. D. (2006). The Nature of Infrared Emission in the Local Group Dwarf Galaxy NGC 6822 as Revealed by Spitzer. ApJ, 652, 1170-1187. doi: 10.1086/508341

Cantó, J., Elliott, K. H., Meaburn, J., y Theokas, A. C. (1980, 12). On the derivation of electron density and temperature from [S II] and [O II] line intensity ratios. MNRAS, 193 4, 911-919. doi: 10.1093/mnras/193.4.911

Castañeda, H. O., Vilchez, J. M., y Copetti, M. V. F. (1992). Density studies on giant extragalactic H II regions. A&A, 260, 370-380.

Clementini, G., Held, E. V., Baldacci, L., y Rizzi, L. (2003). RR Lyrae, Short-Period Variable Stars in the Dwarf Irregular Galaxy NGC 6822. ApJ, 588, L85-L88. doi: 10.1086/375633

Collier, J., y Hodge, P. (1994). The H II regions of NGC 6822. 3: A photometric atlas. ApJS, 92, 119-123. doi: 10.1086/191961

Copetti, M. V. F., Mallmann, J. A. H., Schmidt, A. A., y Castañeda, H. O. (2000). Internal variation of electron density in galactic HII regions. A&A, 357, 621-636.

Currie, M. J., Berry, D. S., Jenness, T., Gibb, A. G., Bell, G. S., y Draper, P. W. (2014, mayo). Starlink Software in 2013. En N. Manset y P. Forshay (Eds.), Astronomical data analysis software and systems xxiii (Vol. 485, p. 391).

de Blok, W. J. G., y Walter, F. (2000). Evidence for Tidal Interaction, a Supergiant H I Shell in the Local Group Dwarf Galaxy NGC 6822. ApJ, 537, L95-L98. doi: 10.1086/312777

De Robertis, M. M., Dufour, R. J., y Hunt, R. W. (1987). A five-level program for ions of astrophysical interest. JRASC, 81, 195-220.

de Vaucouleurs, G., de Vaucouleurs, A., Corwin, H. G., Jr., Buta, R. J., Paturel, G., y Fouque, P. (1991). Third Reference Catalogue of Bright Galaxies (G. de Vaucouleurs, A. de Vaucouleurs, H. G. Corwin Jr., R. J. Buta, G. Paturel, y P. Fouque, Eds.).

De Grijs, R. (2011). An introduction to distance measurement in astronomy. John Wiley & Sons. Diaz, A. I., Terlevich, E., Vilchez, J. M., Pagel, B. E. J., y Edmunds, M. G. (1991). Abundance analysis of giant H II regions in M51. MNRAS, 253, 245-255.

Eskridge, P. B., y White, R. E., III. (1997). The nature of the X-ray point source in the bar of NGC 6822. AJ, 114, 988-996. doi:10.1086/118529

Esteban, C., Bresolin, F., Peimbert, M., García-Rojas, J., Peimbert, A., y Mesa-Delgado, A. (2009). Keck HIRES Spectroscopy of Extragalactic H II Regions: C and O Abundances from Recombination Lines. ApJ, 700, 654-678. doi: 10.1088/0004-637X/700/1/654

Evans, I. N., y Dopita, M. A. (1985). Theoretical models for H II regions. I - Diagnostic diagrams. ApJS, 58, 125-142. doi: 10.1086/191032

Fleming, L. (2021). Synthetic observations of line emission from simulated hii regions (Tesis de Master no publicada).

Gallagher, J. S., III, Hunter, D. A., Gillett, F. C., y Rice, W. L. (1991). Far-infrared properties of NGC 6822. ApJ, 371, 142-147. doi:10.1086/169878

Gallart, C., Aparicio, A., Bertelli, G., y Chiosi, C. (1996a). The Local Group Dwarf Irregular Galaxy NGC 6822.III. The Recent Star Formation History. AJ, 112, 2596. doi: 10.1086/118205

Gallart, C., Aparicio, A., Bertelli, G., y Chiosi, C. (1996b). The Local Group Dwarf Irregular Galaxy NGC 6822.II.The Old, Intermediate -Age Star Formation History. AJ, 112, 1950. doi: 10.1086/118154

Geen, S., Soler, J. D., y Hennebelle, P. (2017). Interpreting the star formation efficiency of nearby molecular clouds with ionizing radiation. MNRAS, 471 4, 4844–4855.

Gottesman, S. T., y Weliachew, L. (1977). An interferometer study of the neutral hydrogen associated with the optical core of the irregular galaxy NGC 6822. A&A, 61, 523-530.

Gratier, P., Braine, J., Rodriguez-Fernandez, N. J., Israel, F. P., Schuster, K. F., Brouillet, N., y Gardan, E. (2010). The molecular interstellar medium of the Local Group dwarf NGC 6822. The molecular ISM of NGC 6822. A&A, 512, A68. doi:10.1051/0004-6361/200911722

Haworth, T. J., Glover, S. C., Koepferl, C. M., Bisbas, T. G., y Dale, J. E. (2018). Synthetic observations of star formation and the interstellar medium. New Astronomy Reviews, 82, 1–58.

Hidalgo-Gámez, A. M., Olofsson, K., y Masegosa, J. (2001). The chemical abundances in a sample of dwarf irregular galaxies. I. Small scale variations within NGC 6822? A&A, 367, 388-404. doi: 10.1051/0004-6361:20010063

Hidalgo-Gámez, A. M., y Peimbert, A. (2007). Diffuse Ionized Gas inside the Dwarf Irregular Galaxy NGC 6822. AJ, 133, 1874-1882. doi: 10.1086/511267

Hodge, P., Lee, M. G., y Kennicutt, R. C., Jr. (1988). The H II regions of NGC 6822. I - an atlas of 157 H II regions. PASP, 100, 917-934. doi:10.1086/132254

Hodge, P., Lee, M. G., y Kennicutt, R. C., Jr. (1989). The H II regions of NGC 6822. II - The luminosity function, size distribution. PASP, 101, 32-39. doi: 10.1086/132401

Hubble, E. (1925). Ngc 6822: A remote stellar system (no 304).

Hubble, E. P. (1925). NGC 6822, a remote stellar system. ApJ, 62, 409-433. doi:10.1086/142943

Hutchings, J. B., Cavanagh, B., y Bianchi, L. (1999). The Resolved Outer Population of NGC 6822 with WFPC2. PASP, 111, 559-565. doi:10.1086/316366

Israel, F. P. (1997). Dust, molecules in the Local Group galaxy NGC 6822. II. CO, molecular hydrogen. A&A, 317, 65-72.

Israel, F. P., Baas, F., Rudy, R. J., Skillman, E. D., y Woodward, C. E. (2003). Dust, molecules in the Local Group galaxy NGC 6822. III. The first-ranked HII region complex Hubble V. A&A, 397, 87-97. doi: 10.1051/0004-6361:20021464

Karachentsev, I. D., Karachentseva, V. E., Huchtmeier, W. K., y Makarov, D. I. (2004). A Catalog of Neighboring Galaxies. AJ, 127, 2031-2068. doi: 10.1086/382905

Keenan, F. P., Aller, L. H., Bell, K. L., Hyung, S., McKenna, F. C., y Ramsbottom, C. A. (1996). Auroral and nebular emission lines of [SII] in the optical spectra of planetary nebulae. MNRAS, 281, 1073-1080.

Kennicutt, R. C., Jr. (1979). H II Regions as Extragalactic Distance Indicators. III. Application of H II Region Fluxes, Galaxy Diameters. ApJ, 228, 704-711. doi:10.1086/156895

Lagrois, D., y Joncas, G. (2009). A Multi-ionic Kinematic Investigation of NGC 595, a Giant Extragalactic H II Region in M33. ApJ, 700, 1847-1877. doi: 10.1088/0004-637X/700/2/1847

Lee, H., Skillman, E. D., y Venn, K. A. (2006). The Spatial Homogeneity of Nebular, Stellar Oxygen Abundances in the Local Group Dwarf Irregular Galaxy NGC 6822. ApJ, 642, 813-833. doi: 10.1086/500568

Lequeux, J., Peimbert, M., Rayo, J. F., Serrano, A., y Torres-Peimbert, S. (1979). Chemical composition, evolution of irregular, blue compact galaxies. A&A, 80, 155-166.

Letarte, B., Demers, S., Battinelli, P., y Kunkel, W. E. (2002). The Extent of NGC 6822 Revealed by Its C Star Population. AJ, 123, 832-839. doi: 10.1086/338319

Longo, G., y Ceriello, M., A.and Capaccioli. (1991). The UV properties of normal galaxies. I - The IUE data. A&AS, 90, 375-386.

López Sánchez, A. (2006). Formación de estrellas masivas en galaxias Wolf-Rayet enanas (Tesis Doctoral no publicada). Departamento de Astrofísica, Universidad de la Laguna.

Maíz-Apellániz, J., Pérez, E., y Mas-Hesse, J. M. (2004a). NGC 604, the Scaled OB Association (SOBA) Prototype. I. Spatial Distribution of the Different Gas Phases and Attenuation by Dust. AJ, 128, 1196-1218. doi: 10.1086/422925

Maíz-Apellániz, J., Pérez, E., y Mas-Hesse, J. M. (2004b). NGC 604, the Scaled OB Association (SOBA) Prototype. I. Spatial Distribution of the Different Gas Phases, Attenuation by Dust. AJ, 128, 1196-1218. doi: 10.1086/422925

Mateo, M. L. (1998). Dwarf Galaxies of the Local Group. ARA&A, 36, 435-506. doi:10.1146/annurev.astro.36.1.435

McCall, M. L. (1984). Emission coefficients for gaseous nebulae - Three-level atom approximations. MNRAS, 208, 253-259.

O’Dell, C. R., Hodge, P. W., y Kennicutt, R. C., Jr. (1999). A Hubble Space Telescope Study of Two HII Regions in NGC 6822. PASP, 111, 1382-1391. doi:10.1086/316452

Oliveira, V. A. (2009). A spectrophotometric study of HII regions in chemically young galaxies (Tesis Doctoral no publicada). Universidade Federal de Santa maria., Santa Maria, RS, Brasil,.

Osterbrock, D. E., y Ferland, G. J. (2006). Astrophysics of Gaseous Nebulae, Active Galactic Nuclei. University Science Books; 2 edición.

Pagel, B. E. J., Edmunds, M. G., y Smith, G. (1980). On the composition of H II regions in southern galaxies. II - NGC 6822, 1313. MNRAS, 193, 219-230.

Peimbert, A., Peimbert, M., y Ruiz, M. T. (2005). Chemical Composition of Two H II Regions in NGC 6822 based on VLT Spectroscopy. ApJ, 634, 1056-1066. doi:10.1086/444557

Peimbert, M., y Spinrad, H. (1970). On the Chemical Abundance of NGC 6822. A&A, 7, 311.

Pellegrini, E. W., Rahner, D., Reissl, S., Glover, S. C., Klessen, R. S., Rousseau-Nepton, L., y Herrera-Camus, R. (2020). warpfield-emp: The self-consistent prediction of emission lines from evolving h ii regions in dense molecular clouds. MNRAS, 496 1, 339–363.

Pérez Oregón, J., Caicedo-Ortiz, H. E., Castañeda Fernández, H. O., y Hidalgo-Gámez, A. M. (2014). La estructura interna de regiones HII gigantes. Jou. Cie. Ing., 6 (1), 16–20. doi: 10.46571/JCI.2014.1.4

Phillips, J. P. (1998). Electron densities in planetary nebulae, and the unusual characteristics of the [s ii] emission zone. A&A, 340, 527-542.

Pietrzy´ nski, G., Gieren, W., Udalski, A., Bresolin, F., Kudritzki, R.-P., . . . Kubiak, M. (2004). The Araucaria Project: The Distance to the Local Group Galaxy NGC 6822 from Cepheid Variables Discovered in a Wide-Field Imaging Survey. AJ, 128, 2815-2825. doi:10.1086/425531

Rayo, J. F., Peimbert, M., y Torres-Peimbert, S. (1982). Gradients in the physical conditions of M101, the pregalactic helium abundance. ApJ, 255, 1-10. doi:10.1086/159796

Relaño, M., Monreal-Ibero, A., Vílchez, J. M., y Kennicutt, R. C. (2010). Spatially resolved study of the physical properties of the ionized gas in NGC 595. MNRAS, 402, 1635-1648. doi: 10.1111/j.1365-2966.2009.16036.x

Relano, M., Beckman, J., Zurita, A., Rozas, M., y Giammanco, C. (2005). The internal dynamical equilibrium of h ii regions: A statistical study. Astronomy & Astrophysics, 431 1, 235–251.

Rosa, M., y Solf, J. (1984). The internal kinematics of the giant extragalactic H II complex NGC 604. A&A, 130, 29-38.

Roy, J. R., y Arsenault, R. (1986). The H-alpha velocity widths of giant H II regions as distance indicators. ApJ, 302, 579-584. doi:10.1086/164016

Rubin, R. H. (1968). The Structure, Properties of H II Regions. ApJ, 153, 761. doi:10.1086/149704

Seaton, M. J., y Osterbrock, D. E. (1957). Relative [OII] Intensities in Gaseous Nebulae. ApJ, 125, 66. doi: 10.1086/146282

Shaw, R. A., y Dufour, R. J. (1995). Software for the Analysis of Emission Line Nebulae. PASP, 107, 896. doi: 10.1086/133637

Shields, G. A. (1990). Extragalactic H II regions. ARA&A, 28, 525-560. doi: 10.1146/annurev.aa.28.090190.002521

Skillman, E. D., Terlevich, R., y Melnick, J. (1989). Abundances in southern Local Group dwarf irregular galaxies. MNRAS, 240, 563-572.

Smith, H. E. (1975). Spectrophotometric observations of ionized hydrogen regions in nearby spiral, irregular galaxies. ApJ, 199, 591-610. doi: 10.1086/153727

Stanghellini, L., y Kaler, J. B. (1989). Electron densities in planetary nebulae. ApJ, 343, 811-827. doi: 10.1086/167751

Stasi´ nska, G. (1980). Some comments on the analysis of extragalactic H II regions spectra. A&A, 84, 320-328.

Strömgren, B. (1939). The Physical State of Interstellar Hydrogen. ApJ, 89, 526. doi:10.1086/144074

Struve, O., y Elvey, C. T. (1934, mayo). The Intensities of Stellar Absorption Lines. ApJ, 79, 409. doi: 10.1086/143551

Tennant, A. F. (2006). Chandra Observation of NGC 6822. AJ, 132, 1372-1383. doi:10.1086/506511

Tolstoy, E., Irwin, M. J., Cole, A. A., Pasquini, L., Gilmozzi, R., y Gallagher, J. S. (2001). Using the CaII triplet to trace abundance variations in individual red giant branch stars in three nearby galaxies. MNRAS, 327, 918-938. doi: 10.1046/j.1365-8711.2001.04785.x

Tomita, A., Ohta, K., y Saito, M. (1993). H-alpha velocity fields of giant H II regions in four nearby dwarf irregular galaxies. PASJ, 45, 693-705.

Venn, K. A., Lennon, D. J., Kaufer, A., McCarthy, J. K., Przybilla, N., Kudritzki, R. P., . . . Smartt, S. J. (2001). First Stellar Abundances in NGC 6822 from VLT-UVES, Keck-HIRES Spectroscopy. ApJ, 547, 765-776. doi: 10.1086/318424

Vílchez, J. M., Pagel, B. E. J., Diaz, A. I., Terlevich, E., y Edmunds, M. G. (1988). The chemical composition gradient across M 33. MNRAS, 235, 633-653.

Weldrake, D. T. F., de Blok, W. J. G., y Walter, F. (2003). A high-resolution rotation curve of NGC 6822: a test-case for cold dark matter. MNRAS, 340, 12-28. doi:10.1046/j.1365-8711.2003.06170.x

White, N. J. (1981). The dynamics and structure of the ionized and neutral gas in the 30 Doradus nebula. Ap&SS, 78, 443-461. doi:10.1007/BF00648950

Wilson, C. D. (1992). The stellar populations of NGC 6822. AJ, 104, 1374-1394. doi:10.1086/116327

Wyder, T. K. (2001). The Star Formation History of NGC 6822. AJ, 122, 2490-2523. doi:10.1086/323706

Zheng, W. (1988). The critical densities for some emission lines. Astrophysical Letters Communications, 27, 275-279.

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