Outlying HII Regions in HI-Selected Galaxies (2009)
Werk, J. K., Putman, M. E., Meurer, G. R., Ryan-Weber, E. V., Kehrig, C., Thilker, D. A., ...
We present results from the first systematic search for outlying HII regions, as part of a sample of 96 emission-line point sources (referred to as ELdots - emission-line dots) derived from the NOAO...
A big γ-ray burst at a redshift of z ≈ 8.2 (2009)
Tanvir, N. R., Fox, D. B., Levan, A. J., Berger, E., Wiersema, K., Fynbo, J. P. U., ...
4 pages, 3 figures.-- ArXiv pre-print available at: http://arxiv.org/abs/0906.1577
A γ-ray burst at a redshift of z ≈ 8.2 (2009)
Tanvir, N. R., Fox , D. B., Levan, A. J., Berger, E., Wiersema, K., Fynbo, J. P. U., ...
Long-duration γ-ray bursts (GRBs) are thought to result from the explosions of certain massive stars, and some are bright enough that they should be observable out to redshifts of z > 20 using...
A glimpse of the end of the dark ages: the gamma-ray burst of 23 April 2009 at redshift 8.3 (2009)
Tanvir, N. R., Fox, D. B., Levan, A. J., Berger, E., Wiersema, K., Fynbo, J. P. U., ...
It is thought that the first generations of massive stars in the Universe were an important, and quite possibly dominant, source of the ultra-violet radiation that reionized the hydrogen gas in the...
Evidence for a Non-Uniform Initial Mass Function in the Local Universe (2009)
Meurer, Gerhardt R., Wong, O. I., Kim, J. H., Hanish, D. J., Heckman, T. M., Werk, J., ...
Many results in modern astrophysics rest on the notion that the Initial Mass Function (IMF) is universal. Our observations of HI selected galaxies in the light of H-alpha and the far-ultraviolet...
Evidence for a nonuniform initial mass function in the local universe (2009)
Meurer, G. R., Wong, O. I., Kim, J. H., Hanish, D. J., Heckman, T. M., Werk, J., ...
Many of the results in modern astrophysics rest on the notion that the initial mass function (IMF) is universal. Our observations of a sample of H I selected galaxies in the light of Hα and the...
[O iii] emitters in the field of the MRC 0316–257 protocluster (2008)
Maschietto, F., Hatch, N. A., Venemans, B. P., Röttgering, H. J. A., Miley, G. K., Overzier, R. A., ...
Venemans et al. found evidence for an overdensity of Lyα emission-line galaxies associated with the radio galaxy MRC 0316−257 at z= 3.13 indicating the presence of a massive protocluster. Here, we...
[OIII] emitters in the field of the MRC 0316-257 protocluster (2008)
Maschietto, F., Hatch, N. A., Venemans, B. P., Röttgering, H. J. A., Miley, G. K., Overzier, R. A., ...
Venemans et al. (2005) found evidence for an overdensity of Ly-alpha emission line galaxies associated with the radio galaxy MRC 0316-257 at z=3.13 indicating the presence of a massive protocluster....
[O III] emitters in the field of the MRC 0316–257 protocluster (2008)
Maschietto, F., Hatch, N. A., Venemans, B. P., Röttgering, H. J. A., Miley, G. K., Overzier, R. A., ...
[OIII] emitters in the field of the MRC0316-257 protocluster (2008)
Maschietto, F., Hatch, N. A., Venemans, B. P., Röttgering, H. J. A., Miley, G. K., Overzier, R. A., ...
Venemans et al. found evidence for an overdensity of Lyalpha emission-line galaxies associated with the radio galaxy MRC0316-257 at z = 3.13 indicating the presence of a massive protocluster. Here,...
PHOTOIONIZATION, SHOCKS OR STARBURSTS? (2007)
M. A. Dopita, L. J. Kewley, R. S. Sutherl
ópticos han sido utilizados para tratar de distinguir entre los varios modos de excitación en regiones nucleares de emisión en galaxias normales y activas. Recientemente se ha hecho gran progreso...
RevMexAA (Serie de Conferencias), 12, 77--81 (2002) (2007)
Calibrating Nebular Diagnostics, M. S. Oey, J. C. Shields, M. A. Dopita, R. C. Smith
We obtained nebular spectroscopy of LMC H II regions having classified stellar populations, thereby strongly constraining the ionization input parameters. Using photoionization models, we then...
Revmexaa Serie De, M. A. Dopita, G. V. Bicknell, R. S. Sutherl, C. J. Saxton, Nlr Zoology
We review recent progress by the RSAA team in elucidating the dynamical evolution of the various classes of narrow-line regions (NLR) in active galaxies.
SPECTRAL SIGNATURES OF JET-DRIVEN SHOCKS IN ACTIVE GALACTIC NUCLEI (2007)
Está ahora claro que las ondas de choque impulsadas por jets en galaxias activas son las responsables de una importante fracción de la emisión de las regiones extendidas de líneas angostas (en...
PHOTOIONIZATION, SHOCKS OR STARBURSTS? (2007)
M. A. Dopita, L. J. Kewley, R. S. Sutherl
opticos han sido utilizados para tratar de distinguir entre los varios modos de excitacion en regiones nucleares de emision en galaxias normales y activas. Recientemente se ha hecho gran progreso...
L. J. Kewley, M. A. Dopita, C. A. Heisler, R. S. Sutherl
Recalibramos la secuencia de abundancias de regiones H II extragalácticas y comparamos modelos de fotoionización y de choques para una muestra luminosa de galaxias australes con brotes de...
RevMexAA (Serie de Conferencias), 13, 177-182 (2002) (2007)
Spectral Signatures Of, M. A. Dopita
It is now clear that jet-driven shocks in active galaxies are responsible for an important fraction of the emission of the extended narrow-line regions (at all wavelengths). The remainder arises from...
RevMexAA (Serie de Conferencias), 12, 77-81 (2002) (2007)
Calibrating Nebular Diagnostics, M. S. Oey, J. C. Shields, M. A. Dopita, R. C. Smith
We obtained nebular spectroscopy of LMC H II regions having classi ed stellar populations, thereby strongly constraining the ionization input parameters. Using photoionization models, we then...
Revmexaa Serie De, M. A. Dopita, G. V. Bicknell, R. S. Sutherl, C. J. Saxton, Nlr Zoology
We review recent progress by the RSAA team in elucidating the dynamical evolution of the various classes of narrow-line regions (NLR) in active galaxies.
RevMexAA (Serie de Conferencias), 9, 163-165 (2000) (2007)
Photoionization And Shock, L. J. Kewley, M. A. Dopita, C. A. Heisler, R. S. Sutherl
We recalibrate the abundance sequence for extragalactic H II regions and compare photoionization and shock models for a luminous sub-sample of southern starburst galaxies. We nd H II regions are...
A New Population of High-Redshift Short-Duration Gamma-Ray Bursts (2007)
Berger, E., Fox, D. B., Price, P. A., Nakar, E., Gal-Yam, A., Holz, D. E., ...
The redshift distribution of the short-duration gamma-ray bursts (GRBs) is a crucial, but currently fragmentary, clue to the nature of their progenitors. Here we present optical observations of nine...
A Catalog of HI Clouds in the Large Magellanic Cloud (2007)
Kim, S., Rosolowsky, E., Lee, Y., Kim, Y., Jung, Y. C., Dopita, M. A., ...
A 21 cm neutral hydrogen interferometric survey of the Large Magellanic Cloud (LMC) combined with the Parkes multi-beam HI single-dish survey clearly shows that the HI gas is distributed in the form...
Oey, M. S., Meurer, G. R., Yelda, S., Furst, E. J., Caballero-Nieves, S. M., Hanish, D. J., ...
We use the first data release from the SINGG H alpha survey of H I-selected galaxies to study the quantitative behavior of the diffuse, warm ionized medium (WIM) across the range of properties...
Oey, M. S., Meurer, G. R., Yelda, S., Furst, E. J., Caballero-Nieves, S. M., Hanish, D. J., ...
We use the first data release from the SINGG H alpha survey of H I-selected galaxies to study the quantitative behavior of the diffuse, warm ionized medium (WIM) across the range of properties...
A New Population of High Redshift Short-Duration Gamma-Ray Bursts (2006)
Berger, E., Fox, D. B., Price, P. A., Nakar, E., Gal-Yam, A., Holz, D. E., ...
The redshift distribution of the short-duration GRBs is a crucial, but currently fragmentary, clue to the nature of their progenitors. Here we present optical observations of nine short GRBs obtained...
Spectral signatures of jet-driven shocks in active galactic nuclei (2006)
Spectral signatures of jet-driven shocks in active galactic nuclei
Photoionization, shocks or starbursts? (2006)
M. A. Dopita, R. S. Sutherland, L. J. Kewley
Photoionization, shocks or starbursts?
Calibrating nebular diagnostics of t* and abundance (2006)
M. A. Dopita, M. S. Oey, J. C. Shields, C. Smith
Calibrating nebular diagnostics of t* and abundance
M. A. Dopita, C. A. Heisler, R. S. Sutherland, B. Rocca Volmerange, L. J. Kewley, E. Moy
Photoionization and shock modelling of the h II region abundance sequence and of luminous infrared galaxies
NGC922 - A new drop-through ring galaxy (2006)
Wong, O. I., Meurer, G. R., Bekki, K., Hanish, D. J., Kennicutt, R. C., Bland-Hawthorn, J., ...
We have found the peculiar galaxy NGC922 to be a new drop-through ring galaxy using multi-wavelength (UV-radio) imaging and spectroscopic observations. Its `C'-shaped morphology and tidal plume...
Hanish, D. J., Meurer, G. R., Ferguson, H. C., Zwaan, M. A., Heckman, T. M., Staveley-Smith, L., ...
We derive observed Halpha and R band luminosity densities of an HI-selected sample of nearby galaxies using the SINGG sample to be l_Halpha' = (9.4 +/- 1.8)e38 h_70 erg s^-1 Mpc^-3 for Halpha and...
The Expansion Asymmetry and Age of the Cassiopeia A Supernova Remnant (2006)
Fesen, R. A., Hammell, M. C., Morse, J., Chevalier, R. A., Borkowski, K. J., Dopita, M. A., ...
HST ACS images of the young SN remnant Cas A are used to explore the expansion and spatial distribution of its highest velocity debris. Proper motions of over 1800 outlying ejecta knots are reported....
Appleton, P. N., Xu, K. C., Reach, W., Dopita, M. A., Gao, Y., Lu, N., ...
We present the discovery of strong mid-infrared emission lines of molecular hydrogen of apparently high velocity dispersion (~870 km/s) originating from a group-wide shock wave in Stephan's Quintet....
Dopita, M. A., Fischera, J., Sutherland, R. S., Kewley, L., Tuffs, R. J., Popescu, C. C., ...
We examine, froma theoretical viewpoint, how the physical parameters of H ii regions are controlled in both normal galaxies and in starburst environments. These parameters are the H ii region...
Dopita, M. A., Fischera, J., Sutherland, R. S., Kewley, L. J., Leitherer, C., Tuffs, R. J., ...
We build, as far as theory will permit, self-consistent model H II regions around central clusters of aging stars. These produce strong emission line diagnostics applicable to either individual H II...
Dopita, M. A., Fischera, J., Sutherland, R. S., Kewley, L., Tuffs, R. J., Popescu, C. C., ...
We examine, from a theoretical viewpoint, how the physical parameters of H II regions are controlled in both normal galaxies and in starburst environments. These parameters are the H II region...
NGC922 - a new drop-through ring galaxy (2006)
Wong, O. I., Meurer, G. R., Bekki, K., Hanish, D. J., Kennicutt Jr, R. C., Bland-Hawthorn, J., ...
We have found the peculiar galaxy NGC 922 to be a new drop-through ring galaxy using multiwavelength (ultraviolet-radio) imaging and spectroscopic observations. Its 'C'-shaped morphology and tidal...
NGC922 - a new drop-through ring galaxy (2006)
Wong, O. I., Meurer, G. R., Bekki, K., Hanish, D. J., Kennicutt Jr, R. C., Bland-Hawthorn, J., ...
We have found the peculiar galaxy NGC 922 to be a new drop-through ring galaxy using multiwavelength (ultraviolet-radio) imaging and spectroscopic observations. Its 'C'-shaped morphology and tidal...
Discovery of Outlying, High-Velocity Oxygen-Rich Ejecta in Cassiopeia A (2005)
Fesen, R. A., Hammell, M. C., Morse, J., Chevalier, R. A., Borkowski, K. J., Dopita, M. A., ...
Hubble Space Telescope images of the young Galactic supernova remnant Cassiopeia A reveal a far larger population of outlying, high-velocity knots of ejecta with a broader range of chemical...
Kim, S., Staveley-Smith, L., Dopita, M. A., Sault, R. J., Freeman, K. C., Lee, Y., ...
Using a Fourier-plane technique, we have merged HI ATCA and Parkes data sets providing an accurate set of images of the LMC sensitive to structure on scales of 15 pc (for an LMC distance of 55 kpc)...
Dopita, M. A., Groves, B. A., Fischera, J., Sutherland, R. S., Tuffs, R. J., Popescu, C. C., ...
In this paper, we combine the stellar spectral synthesis code STARBURST99, the nebular modeling code MAPPINGS IIIq, a one-dimensional dynamical evolution model of H II regions around massive clusters...
Appleton, P. N., Xu, K. C., Reach, W., Dopita, M. A., Gao, Y., Lu, N., ...
We present the discovery of strong mid-infrared emission lines of molecular hydrogen of apparently high-velocity dispersion ( ± 870 km s-1) originating from a group-wide shock wave in Stephan's...
Starburst galaxies in the far-infrared. Modelling the line, PAH and dust continuum emission (2005)
Dopita, M. A., Brent, A., Groves, B. A., Fischera, J., Sutherland, R. S., Tuffs, Richard J., ...
The Effect of the Bulge-to-disk Ratio on the Derived Opacities of Spiral Galaxies (2004)
Tuffs,R. J., Popescu,C. C., Völk,H. J., Kylafis,N. D., Dopita,M. A.
Tuffs,R.J., Popescu,C.C., Völk,H.J., Kylafis,N.D., Dopita,M.A.
We present new calculations of the attenuation of stellar light from spiral galaxies using geometries for stars and dust which can reproduce the entire spectral energy distribution from the...
Modelling the Pan-Spectral Energy Distributions of Starburst & Active Galaxies (2004)
We present results of a self-consistent model of the spectral energy distribution (SED) of starburst galaxies. Two parameters control the IR SED, the mean pressure in the ISM and the destruction...
The Effect of the Bulge-to-disk Ratio on the Derived Opacities of Spiral Galaxies (2004)
Tuffs,R. J., Popescu,C. C., Völk,H. J., Kylafis,N. D., Dopita,M. A.
Tuffs, R.J., Popescu, C.C., Völk, H.J., Kylafis, N.D., Dopita, M.A.
We present new calculations of the attenuation of stellar light from spiral galaxies using geometries for stars and dust which can reproduce the entire spectral energy distribution from the...
The Effect of the Bulge-to-disk Ratio on the Derived Opacities of Spiral Galaxies (2004)
Tuffs, R. J., Popescu, C. C., Völk, H. J., Kylafis, N. D., Dopita, M. A.
The Effect of the Bulge-to-disk Ratio on the Derived Opacities of Spiral Galaxies (2004)
Tuffs, R. J., Popescu, C. C., Völk, H. J., Kylafis, N. D., Dopita, M. A.
Modelling the pan-spectral energy distributions of Starburst and active galaxies (2004)
Dopita, M. A., Fischera, Jörg, Groves, B., Sutherland, R. S., Kewley, L. J., Tuffs, R. J., ...
The Dynamical Evolution of Narrow Line Regions (2002)
Dopita, M. A., Bicknell, G. V., Sutherland, R. S., Saxton, C. J.
We review recent progress by the RSAA team in elucidating the dynamical evolution of the various classes of Narrow Line Regions (NLR) in active galaxies.
Dopita, M. A., Groves, B. A., Sutherland, R. S., Kewley, L. J.
Star formation rates in galaxies are frequently estimated using the Balmer line fluxes. However, these can be systematically underestimated because dust competes for the absorption of Lyman continuum...
COLA II - Radio and Spectroscopic Diagnostics of Nuclear Activity in Galaxies (2002)
Corbett, E. A., Kewley, L. J., Appleton, P. N., Charmandaris, V., Dopita, M. A., Heisler, C. A., ...
We present optical spectroscopic observations of 93 galaxies taken from the infra-red selected COLA (Compact Objects in Low Power AGN) sample. The sample spans the range of far-IR luminosities from...
The H-alpha and Infrared Star Formation Rates for the Nearby Field Galaxy Survey (2002)
Kewley, L. J., Geller, M. J., Jansen, R. A., Dopita, M. A.
We investigate the H-alpha and infrared star formation rate (SFR) diagnostics for galaxies in the Nearby Field Galaxy Survey (NFGS). For the 81 galaxies in our sample, we derive H-alpha fluxes...
The Dynamical Interaction of AGN with their Galaxian Environments (2002)
Jet-driven shocks are responsible for an important fraction of the emission of the narrow-line regions (NLRs) in many classes of AGN. However, this cannot explain all observations. It is clear that...
Using Strong Lines to Estimate Abundances in Extragalactic HII Regions and Starburst Galaxies (2002)
We have used a combination of stellar population synthesis and photoionization models to develop a set of ionization parameter and abundance diagnostics based only on the use of the strong optical...
Are the Narrow Line Regions in Active Galaxies Dusty and Radiation Pressure Dominated? (2002)
Dopita, M. A., Groves, B. A., Sutherland, R. S., Binette, L., Cecil, G.
The remarkable similarity between emission spectra of narrow line regions (NLR) in Seyfert Galaxies has long presented a mystery. In photoionization models, this similarity implies that the...
Photoionization, shocks or starbursts? (2002)
Dopita , M. A., Kewley , L. J., Sutherland , R. S.
Since Baldwin, Phillips, & Terlevich and Osterbrock & Veilleux popularized their use, optical diagnostic plots have been used to attempt to distinguish between the various modes of excitation in...
Calibrating nebular diagnostics of t* and abundance (2002)
Dopita, M. A., Oey, M. S., Shields, J. C., Smith, C.
We obtained nebular spectroscopy of LMC H II regions having classi ed stellar populations, thereby strongly constraining the ionization input parameters. Using photoionization models, we then...
Corbett, E. A., Norris, R. P., Heisler, C. A., Dopita, M. A., Appleton, P., Struck, C., ...
We present the first results from the COLA (Compact Objects in Low-power AGN) project which aims to determine the relationship between one facet of AGN activity, the compact radio core, with star...
Theoretical Modeling of Starburst Galaxies (2001)
Kewley, L. J., Dopita, M. A., Sutherland, R. S., Heisler, C. A., Trevena, J.
We have modeled a large sample of infrared starburst galaxies using both the PEGASE v2.0 and STARBURST99 codes to generate the spectral energy distribution of the young star clusters. PEGASE utilizes...
Calibrating nebular diagnostics of T_* and abundance (2001)
Oey, M. S., Shields, J. C., Dopita, M. A., Smith, R. C.
We obtained nebular spectroscopy of LMC HII regions having classified stellar populations, thereby strongly constraining the ionization input parameters. Using photoionization models, we then...
Dopita , M. A., Heisler , C. A., Kewley , L. J., Moy , E., Rocca Volmerange, B., Sutherland , R. S.
We recalibrate the abundance sequence for extragalactic H II regions and compare photoionization and shock models for a luminous sub-sample of southern starburst galaxies. We nd H II regions are...
Calibration of Nebular Emission-Line Diagnostics: I. Stellar Effective Temperatures (1999)
Oey, M. S., Dopita, M. A., Shields, J. C., Smith, R. C.
We present a detailed comparison of optical H II region spectra to photoionization models based on modern stellar atmosphere models. We examine both spatially resolved and integrated emission-line...
The Nuclear Spectrum of M87 (1998)
Tsvetanov, Z. I., Hartig, G. F., Ford, H. C., Kriss, G. A., Dopita, M. A., Dressel, L. L., ...
The nuclear spectrum of M87 covering the Ly_a-H_a wavelength range was obtained with the HST Faint Object Spectrograph (FOS) trough a 0.21 arcsec aperture. Contrary to some previous claims, a single...
Ultraviolet Diagnostics for the Emission Line Gas in Active Galaxies (1998)
Allen, M. G., Dopita, M. A., Tsvetanov, Z. I.
Optical diagnostic diagrams are frequently ambiguous as a test of the photoionization or fast shock models of the narrow line regions of active galaxies. Here, we present a set of UV line ratio...
Induced Compton Scattering in Gigahertz Peak Spectrum Sources (1997)
Kuncic, Z., Bicknell, G. V., Dopita, M. A.
We revisit the shocked shell model for the class of Active Galactic Nuclei known as Gigahertz Peak Spectrum sources, incorporating new observational data on the radiation brightness temperatures. We...
Are Seyfert Narrow Line Regions Powered by Radio Jets? (1997)
Bicknell, G. V., Dopita, M. A., Tsvetanov, Z., Sutherland, R. S.
We argue that the narrow line regions of Seyfert galaxies are powered by the transport of energy and momentum by the radio-emitting jets and consequently that the ratio of the radio power to jet...
Discovery of another Am-Herculis Variable in the Period Gap. (1993)
Wickramasinghe, D.T., Ferrario, L., Bailey, J., Drissen, L., Dopita, M.A., Shara, M., ...
Original article can be found via: http://cdsads.u-strasbg.fr/ Copyright Royal Astronomical Society [Full text of this article is not available in the UHRA]