65 results on '"Emission nebula"'
Search Results
2. Narrowband Processing
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Keller, Warren A. and Keller, Warren A.
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- 2016
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3. Public Outreach Applications
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Chung, Jim, Watson, John, Series editor, and Chung, Jim
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- 2015
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4. Emission Nebula
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Irvine, William M., Gargaud, Muriel, editor, Irvine, William M., editor, Amils, Ricardo, editor, Cleaves, Henderson James (Jim), II, editor, Pinti, Daniele L., editor, Quintanilla, José Cernicharo, editor, Rouan, Daniel, editor, Spohn, Tilman, editor, Tirard, Stéphane, editor, and Viso, Michel, editor
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- 2015
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5. YY Hya and its interstellar environment
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Robert A. Fesen, K. E. Weil, Norbert Przybilla, Justin D. Rupert, Stefan Kimeswenger, Marcel Drechsler, Thomas Steindl, Xavier Strottner, John R. Thorstensen, and Maicon Germiniani
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Physics ,Dwarf star ,Nebula ,Astrophysics::High Energy Astrophysical Phenomena ,White dwarf ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Orbital period ,Light curve ,Astrophysics - Astrophysics of Galaxies ,Common envelope ,Emission nebula ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,Astrophysics::Solar and Stellar Astrophysics ,Emission spectrum ,Astrophysics::Earth and Planetary Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics - Abstract
During a search for previously unknown Galactic emission nebulae, we discovered a faint 36' diameter Halpha emission nebula centered around the periodic variable YY Hya. Although this star has been classified as RR-Lyr variable, such a classification is inconsistent Gaia distance of ~450 pc. GALEX image data also shows YY Hya to have a strong UV excess, suggesting the existence of a hot, compact binary companion. In addition to our discovery image data, we obtained image of the region with CHILESCOPE time-series spectroscopy at MDM observatory. Also, we used data from various space missions to derive an exact orbital period and a SED. We find that YY Hya is a compact binary system containing a K dwarf star which is strongly irradiated by a hot WD companion. The spectral characteristics of the emission lines, visible only during maximum light of the perfectly sinusoidal optical}light curve shows signatures much like members of the BE UMa variable family. These are post common envelope pre-cataclysmic variables. However the companion star here is more massive than found in other group members and the progenitor of the white dwarf must have been a 3 to 4 Mo star. The nebula seems to be an ejected common envelope shell with a mass in the order of one Mo and an age of 500000 years. This makes it to be the biggest hitherto known such shell. Alignment of neighboring nebulosities some 45' to the northeast and southwest of YY Hya suggests that the system had strong bipolar outflows. We briefly speculate it might be related to the 1065 BP "guest-star" reported in ancient Chinese records as well., 18 pages, 17 figures accepted for publication in A&A
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- 2021
6. A new numerical code for hydrodynamical 3D simulations of supernova remnants
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P. Kostić
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Physics ,Finite volume method ,lcsh:Astronomy ,Turbulence ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy and Astrophysics ,Astrophysics ,Riemann solver ,methods: numerical ,lcsh:QB1-991 ,Interstellar medium ,symbols.namesake ,Supernova ,Emission nebula ,ism: supernova remnants ,symbols ,Supernova remnant ,Astrophysics::Galaxy Astrophysics ,Blast wave - Abstract
We develop a 3D hydrodynamical code written in C programming language to study the expansion of supernova remnants (SNRs) in the surrounding medium. It is based on the MUSCL-Hancock finite volume scheme with the HLLC Riemann solver. The code initiates the supernova remnant already in the Sedov phase and simulates hydrodynamics of the subsequent remnant expansion. The simulation is optimized for studies of large scale interaction of a supernova remnant with the interstellar medium (ISM). After a detailed description of the code, and three tests of hydrodynamics, we present the results for a single remnant expanding into a uniform and fractally structured ISM, as the first application of the code. The simulation of SNR expanding in a uniform medium is compared with the Sedov law of expansion and Sedov self-similar solution to density, velocity and pressure profiles. The results indicate that the simulation presented here reproduces well the hydrodynamics of the supernova remnant expansion and is very practical due to its simplicity and speed. The SNR evolution in fractal ISM shows that clumps disturb the blast wave and produce interference of bow shocks, resulting in turbulent motions and inhomogenities inside the remnant. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 176005: Emission nebulae: structure and evolution]
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- 2019
7. Estimating dust attenuation from galactic spectra. II. Stellar and gas attenuation in star-forming and diffuse ionized gas regions in MaNGA
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Rogério Riffel, Médéric Boquien, Cheng Li, Michael J. Greener, Niu Li, Houjun Mo, Niv Drory, José G. Fernández-Trincado, Fu-Heng Liang, and Shuang Zhou
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Metallicity ,Star (game theory) ,FOS: Physical sciences ,Astrophysics ,Poeira cosmica ,Gas ionizado ,Hot ionized medium ,Spectral line ,Warm ionized medium ,symbols.namesake ,Populacoes estelares ,Star forming regions ,Emission nebula ,Stellar populations ,Formacao de estrelas ,Galaxy spestroscopy ,Interstellar extinction ,Emission nebulae ,Cosmic dust ,Physics ,Star formation ,Interstellar dust extinction ,Balmer series ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,symbols ,Interstellar dust - Abstract
We investigate the dust attenuation in both stellar populations and ionized gas in kpc-scale regions in nearby galaxies, using integral field spectroscopy data from MaNGA MPL-9. We identify star-forming (HII) and diffuse ionized gas (DIG) regions from MaNGA datacubes. From the stacked spectrum of each region, we measure the stellar attenuation, $E(B-V)_{\rm star}$, using the technique developed by Li et al.(2020), as well as the gas attenuation, $E(B-V)_{\rm gas}$, from the Balmer decrement. We then examine the correlation of $E(B-V)_{\rm star}$, $E(B-V)_{\rm gas}$, $E(B-V)_{\rm gas}-E(B-V)_{\rm star}$ and $E(B-V)_{\rm star}/E(B-V)_{\rm gas}$ with 16 regional/global properties, and for regions with different $\rm H{\alpha}$ surface brightnesses ($\Sigma_{\rm H\alpha}$). We find a stronger correlation between $E(B-V)_{\rm star}$ and $E(B-V)_{\rm gas}$ in regions of higher $\Sigma_{\rm H\alpha}$. Luminosity-weighted age ($t_L$) is found to be the property that is the most strongly correlated with $E(B-V)_{\rm star}$, and consequently with $E(B-V)_{\rm gas}-E(B-V)_{\rm star}$ and $E(B-V)_{\rm star}/E(B-V)_{\rm gas}$. At fixed $\Sigma_{\rm H\alpha}$, $\log_{10}t_L$ is linearly and negatively correlated with $E(B-V)_{\rm star}/E(B-V)_{\rm gas}$ at all ages. Gas-phase metallicity and ionization level are important for the attenuation in the gas. Our results indicate that the ionizing source for DIG regions is likely distributed in the outer-skirt of galaxies, while for HII regions our results can be well explained by the two-component dust model of Charlot & Fall (2000)., Comment: accepted by ApJ
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- 2021
8. Keck Cosmic Web Imager Observations of He II Emission in I Zw 18
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Leslie K. Hunt, Ryan J. Rickards Vaught, and Karin Sandstrom
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Physics ,010504 meteorology & atmospheric sciences ,Metallicity ,X-ray binary ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics - Astrophysics of Galaxies ,01 natural sciences ,Galaxy ,Stars ,Emission nebula ,Cosmic web ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,010303 astronomy & astrophysics ,0105 earth and related environmental sciences - Abstract
With a metallicity of 12 + Log(O/H) $\approx$ 7.1-7.2, I Zw 18 is a canonical low-metallicity blue compact dwarf (BCD) galaxy. A growing number of BCDs, including I Zw 18, have been found to host strong, narrow-lined, nebular He II ($\lambda$4686) emission with enhanced intensities compared to H$\beta$ (e.g., He II($\lambda$4686)/H$\beta$ > 1%). We present new observations of I Zw 18 using the Keck Cosmic Web Imager. These observations reveal two nebular He II emission regions (or He III regions) northwest and southeast of the He III region in the galaxy's main body investigated in previous studies. All regions exhibit He II($\lambda4686$)/Hbeta greater than 2%. The two newly resolved He III regions lie along an axis that intercepts the position of I Zw 18's ultraluminous X-ray (ULX) source. We explore whether the ULX could power the two He III regions via shock activity and/or beamed X-ray emission. We find no evidence of shocks from the gas kinematics. If the ULX powers the two regions, the X-ray emission would need to be beamed. Another potential explanation is that a class of early-type nitrogen-rich Wolf-Rayet stars with low winds could power the two He III regions, in which case the alignment with the ULX would be coincidental., Comment: 9 pages, 4 figures, accepted for publication in ApJL
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- 2021
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9. A Machine-learning Approach to Integral Field Unit Spectroscopy Observations. I. H ii Region Kinematics
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Carter Rhea, N. V. Asari, Laurence Perreault-Levasseur, Laurie Rousseau-Nepton, Julie Hlavacek-Larrondo, M. Prasow-Émond, Kathryn Grasha, Simon Prunet, Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Canada-France-Hawaii Telescope Corporation (CFHT), National Research Council of Canada (NRC)-Centre National de la Recherche Scientifique (CNRS)-University of Hawai'i [Honolulu] (UH), Institut d'Astrophysique de Paris (IAP), and Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
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Physics ,H II region ,Artificial neural network ,Field (physics) ,[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] ,Interstellar cloud ,Astronomy and Astrophysics ,01 natural sciences ,Astrophysics - Astrophysics of Galaxies ,010305 fluids & plasmas ,Computational physics ,[SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] ,Emission nebula ,Space and Planetary Science ,0103 physical sciences ,Spectroscopy ,Astrophysics - Instrumentation and Methods for Astrophysics ,010303 astronomy & astrophysics ,Unit (ring theory) ,Line (formation) - Abstract
SITELLE is a novel integral field unit spectroscopy instrument that has an impressive spatial (11 by 11 arcmin), spectral coverage, and spectral resolution (R=1-20000). SIGNALS is anticipated to obtain deep observations (down to 3.6x10-17ergs s-1cm-2) of 40 galaxies, each needing complex and substantial time to extract spectral information. We present a method that uses Convolution Neural Networks (CNN) for estimating emission line parameters in optical spectra obtained with SITELLE as part of the SIGNALS large program. Our algorithm is trained and tested on synthetic data representing typical emission spectra for HII regions based on Mexican Million Models database(3MdB) BOND simulations. The network's activation map demonstrates its ability to extract the dynamical (broadening and velocity) parameters from a set of 5 emission lines (e.g. H{\alpha}, N[II] doublet, and S[II] doublet) in the SN3 (651-685 nm) filter of SITELLE. Once trained, the algorithm was tested on real SITELLE observations in the SIGNALS program of one of the South West fields of M33. The CNN recovers the dynamical parameters with an accuracy better than 5 km s-1 in regions with a signal-to-noise ratio greater than 15 over the H{\alpha}line. More importantly, our CNN method reduces calculation time by over an order of magnitude on the spectral cube with native spatial resolution when compared with standard fitting procedures. These results clearly illustrate the power of machine learning algorithms for the use in future IFU-based missions. Subsequent work will explore the applicability of the methodology to other spectral parameters such as the flux of key emission lines., Comment: 14 pages, 11 figures Accepted in ApJ
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- 2020
10. The Nature of the Young Supernova Remnant S8 in the Dwarf Galaxy IC 1613
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Kathryn E. Weil and Robert A. Fesen
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010504 meteorology & atmospheric sciences ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Spectral line ,Emission nebula ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Emission spectrum ,Continuum (set theory) ,Supernova remnant ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,0105 earth and related environmental sciences ,Line (formation) ,Physics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Nebula ,Astronomy and Astrophysics ,Interstellar medium ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
We present sub-arcsecond optical images and low- to moderate-resolution spectra of the compact, X-ray and optically bright supernova remnant known as S8 in the nearby dwarf galaxy IC 1613. Deep H$\alpha$ images of the remnant show a sharply defined crescent shaped nebula, while narrow passband images reveal a coincident and unexpectedly bright continuum nebulosity exhibiting a size and morphology like that seen for the remnant's line emissions. Low-dispersion spectra covering 3600 - 9000 A show numerous low-ionization line emissions such as [O I] and [Fe II], along with higher-ionization emission lines including He II and optical coronal lines [Fe VII], [Fe X], [Fe XI], and [Fe XIV]. This suggests the presence of a wide range of shock velocities from $\sim$ 50 to over 350 km s$^{-1}$, corresponding to preshock densities of $\sim1 - 30$ cm$^{-3}$. Higher resolution spectra indicate an expansion velocity around 180 km s$^{-1}$ with a $\sim45$ km s$^{-1}$ wide central cavity. H$\alpha$ emission spans rest frame velocities of $+120$ to $-240$ km s$^{-1}$ and we estimate a total nebula mass of $119 \pm 34$ M$_{\odot}$. We conclude S8 is a relatively young supernova remnant ($\simeq2700 - 4400$ yr) exhibiting properties remarkably like those seen in the young LMC remnant N49, including age, physical size, shock velocities, filament densities, optical line strengths, X-ray and optical luminosities, and coronal line and continuum emissions., Comment: 19 pages, 6 figures, and 5 tables. Accepted for publication in ApJ
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- 2020
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11. The Lyman Continuum Escape Survey: Connecting Time-Dependent [OIII] and [OII] Line Emission with Lyman Continuum Escape Fraction in Simulations of Galaxy Formation
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Kirk S. S. Barrow, A. Saxena, Kimihiko Nakajima, Mengtao Tang, Brant Robertson, Richard S. Ellis, and Daniel P. Stark
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Physics ,010308 nuclear & particles physics ,Continuum (design consultancy) ,Doubly ionized oxygen ,FOS: Physical sciences ,Astronomy and Astrophysics ,Fraction (chemistry) ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Astrophysics - Astrophysics of Galaxies ,High time-resolution astrophysics ,Emission nebula ,13. Climate action ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,Galaxy formation and evolution ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Line (formation) - Abstract
Escaping Lyman continuum photons from galaxies likely reionized the intergalactic medium at redshifts $z\gtrsim6$. However, the Lyman continuum is not directly observable at these redshifts and secondary indicators of Lyman continuum escape must be used to estimate the budget of ionizing photons. Observationally, at redshifts $z\sim2-3$ where the Lyman continuum is observationally accessible, surveys have established that many objects that show appreciable Lyman continuum escape fractions $f_{esc}$ also show enhanced [OIII]/[OII] (O$_{32}$) emission line ratios. Here, we use radiative transfer analyses of cosmological zoom-in simulations of galaxy formation to study the physical connection between $f_{esc}$ and O$_{32}$. Like the observations, we find that the largest $f_{esc}$ values occur at elevated O$_{32}\sim3-10$ and that the combination of high $f_{esc}$ and low O$_{32}$ is extremely rare. While high $f_{esc}$ and O$_{32}$ often are observable concurrently, the timescales of the physical origin for the processes are very different. Large O$_{32}$ values fluctuate on short ($\sim$1 Myr) timescales during the Wolf-Rayet-powered phase after the formation of star clusters, while channels of low absorption are established over tens of megayears by collections of supernovae. We find that while there is no direct causal relation between $f_{esc}$ and O$_{32}$, high $f_{esc}$ most often occurs after continuous input from star formation-related feedback events that have corresponding excursions to large O$_{32}$ emission. These calculations are in agreement with interpretations of observations that large $f_{esc}$ tends to occur when O$_{32}$ is large, but large O$_{32}$ does not necessarily imply efficient Lyman continuum escape., Comment: 12 pages, 5 figures, submitted to ApJL on September 15, 2020
- Published
- 2020
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12. The post-common-envelope binary central star of the planetary nebula ETHOS 1
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Miguel Santander-García, Pablo Rodríguez-Gil, David Jones, M. M. Rubio-Díez, Henri M. J. Boffin, Brent Miszalski, Romano L. M. Corradi, Jorge García-Rojas, J. Munday, Paulina Sowicka, Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737, National Science Centre, Poland (NCN), Agencia Estatal de Investigación (AEI), Munday, J. [0000-0002-1872-5398], Jones, D. [0000-0003-3947-5946], García Rojas, J. [0000-0002-6138-1869], Boffin, H. [0000-0002-9486-4840], Miszalski, B. [0000-0003-2561-6306], Swicka, P. [0000-0002-6605-0268], European Regional Development Fund (ERDF), Ministerio de Ciencia e Innovación (MICINN), and Polish National Center for Science (NCN)
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FOS: Physical sciences ,Astrophysics ,Star (graph theory) ,01 natural sciences ,Common envelope ,Emission nebula ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Binary system ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,individual: PN PN G068.1+11.0 [Planetary nebulae] ,Physics ,Nebula ,010308 nuclear & particles physics ,White dwarf ,Astronomy ,White dwarfs ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Planetary nebula ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,AGB and post AGB [Stars] ,Astrophysics::Earth and Planetary Astrophysics ,close [Binaries] ,Main sequence - Abstract
We present a detailed study of the binary central star of the planetary nebula ETHOS 1 (PN G068.1+11.0). Simultaneous modelling of light and radial velocity curves reveals the binary to comprise a hot and massive pre-white dwarf with an M-type main-sequence companion. A good fit to the observations was found with a companion that follows expected mass–temperature–radius relationships for low-mass stars, indicating that despite being highly irradiated, it is consistent with not being significantly hotter or larger than a typical star of the same mass. Previous modelling indicated that ETHOS 1 may comprise the first case where the orbital plane of the central binary does not lie perpendicular to the nebular symmetry axis, at odds with the expectation that the common envelope is ejected in the orbital plane. We find no evidence for such a discrepancy, deriving a binary inclination in agreement with that of the nebula as determined by spatio-kinematic modelling. This makes ETHOS 1 the ninth post-common-envelope planetary nebula in which the binary orbital and nebular symmetry axes have been shown to be aligned, with as yet no known counter-examples. The probability of finding such a correlation by chance is now less than 0.000 02 per cent., With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737)
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- 2020
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13. Particle acceleration in interstellar shocks
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Dejan Urošević, Bojan Arbutina, and D. Onić
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High Energy Astrophysical Phenomena (astro-ph.HE) ,Shock wave ,Physics ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astronomy and Astrophysics ,Fermi acceleration ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Astrophysics - Astrophysics of Galaxies ,01 natural sciences ,Particle acceleration ,Interstellar medium ,Acceleration ,Supernova ,Emission nebula ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,Astrophysics - High Energy Astrophysical Phenomena ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Fermi Gamma-ray Space Telescope - Abstract
This review presents the fundamentals of the particle acceleration processes active in interstellar medium (ISM), which are essentially based on the so-called Fermi mechanism theory. More specifically, the review presents here in more details the first order Fermi acceleration process -- also known as diffusive shock acceleration (DSA) mechanism. In this case, acceleration is induced by the interstellar (IS) shock waves. These IS shocks are mainly associated with emission nebulae (HII regions, planetary nebulae and supernova remnants). Among all types of emission nebulae, the strongest shocks are associated with supernova remnants (SNRs). Due to this fact they also provide the most efficient manner to accelerate ISM particles to become {high energy particles}, i.e.~cosmic-rays (CRs). The review therefore focuses on the particle acceleration at the strong shock waves of supernova remnants., Comment: Accepted for publication in Astrophysics and Space Science
- Published
- 2019
14. Distance to the Pulsar B1642–03 and the Influence of the H II Region S27 on Its Dispersion Measure and Scattering Parameters
- Author
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A. V. Pynzar
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Physics ,H II region ,Nebula ,010308 nuclear & particles physics ,Scattering ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,01 natural sciences ,Measure (mathematics) ,Emission nebula ,Pulsar ,Space and Planetary Science ,0103 physical sciences ,Dispersion (optics) ,Scattering parameters ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
Based on data on the dispersion measure and the interstellar-scattering parameters of the pulsar B1642–03, which is observed in the direction of the emission nebula S27 around the early-type star ζ Oph, it is concluded that this nebula makes a relatively small contribution to its dispersion measure (∼9−23%) and scattering angle (∼9−16%). It is shown that the distance to B1642–03 is 2.2–2.6 kpc.
- Published
- 2018
15. LUCI: A Python Package for SITELLE Spectral Analysis
- Author
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Carter Rhea, Benjamin Vigneron, Louis-Simon Guité, Laurie Rousseau-Nepton, and Julie Hlavacek-Larrondo
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Physics ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Velocity dispersion ,Astrophysics::Cosmology and Extragalactic Astrophysics ,General Medicine ,Astrophysics ,Python (programming language) ,Astrophysics - Astrophysics of Galaxies ,Planetary nebula ,Galaxy ,Data cube ,Supernova ,Emission nebula ,Astrophysics of Galaxies (astro-ph.GA) ,Astrophysics - Instrumentation and Methods for Astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,computer ,Astrophysics::Galaxy Astrophysics ,Galaxy cluster ,computer.programming_language - Abstract
High-resolution optical integral field units (IFUs) are rapidly expanding our knowledge of extragalactic emission nebulae in galaxies and galaxy clusters. By studying the spectra of these objects -- which include classic HII regions, supernova remnants, planetary nebulae, and cluster filaments -- we are able to constrain their kinematics (velocity and velocity dispersion). In conjunction with additional tools, such as the BPT diagram, we can further classify emission regions based on strong emission-line flux ratios. LUCI is a simple-to-use python module intended to facilitate the rapid analysis of IFU spectra. LUCI does this by integrating well-developed pre-existing python tools such as astropy and scipy with new machine learning tools for spectral analysis (Rhea et al. 2020). Furthermore, LUCI provides several easy-to-use tools to access and fit SITELLE data cubes., Submitted to RNAAS Extensive documentation can be found at https://crhea93.github.io/LUCI/index.html
- Published
- 2021
16. Neutron-capture element abundances in the planetary nebula NGC 5315 from deep optical and near-infrared spectrophotometry★†
- Author
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Ian U. Roederer, A. L. Mashburn, S. Madonna, Nicholas C. Sterling, Jorge García-Rojas, Adal Mesa-Delgado, Gloria Delgado-Inglada, and V. Luridiana
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Physics ,Very Large Telescope ,Solar mass ,010308 nuclear & particles physics ,FOS: Physical sciences ,Astronomy ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies ,01 natural sciences ,Planetary nebula ,Protoplanetary nebula ,Radial velocity ,Emission nebula ,Astrophysics - Solar and Stellar Astrophysics ,13. Climate action ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,Emission spectrum ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Line (formation) - Abstract
We analyze the chemical composition of the planetary nebula (PN) NGC 5315, through high-resolution (R = 40000) optical spectroscopy with UVES at the Very Large Telescope, and medium-resolution (R = 4800) near-infrared spectroscopy with FIRE at Magellan Baade Telescope, covering a wide spectral range from 0.31 to 2.50 micron. The main aim of this work is to investigate neutron (n)-capture element abundances to study the operation of the slow n-capture ("s-process") in the AGB progenitor of NGC 5315. We detect more than 700 emission lines, including ions of the n-capture elements Se, Kr, Xe, and possibly Br. We compute physical conditions from a large number of diagnostic line ratios, and derive ionic abundances for species with available atomic data. The total abundances are computed using recent ionization correction factors (ICFs) or by summing ionic abundances. Total abundances of common elements are in good agreement with previous work on this object. Based on our abundance analysis of NGC 5315, including the lack of s-process enrichment, we speculate that the most probable scenario is that the progenitor star is in a binary system as hinted at by radial velocity studies, and interactions with its companion truncated the AGB before s-process enrichment could occur. However there are other two possible scenarios for its evolution, that cannot be ruled out: i) the progenitor is a low-mass single star that did not undergo third dredge-up; ii) the progenitor star of NGC 5315 had an initial mass of 4--6 solar masses, and any s-process enhancements were heavily diluted by the massive envelope during the AGB phase., 31 pages, 6 figures, 15 tables. Accepted for publication in MNRAS
- Published
- 2017
17. Three-dimensional Monte Carlo dust radiative transfer study of the H-poor planetary nebula IRAS 18333–2357 located in M22
- Author
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C. Muthumariappan
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Physics ,010308 nuclear & particles physics ,Monte Carlo method ,Astronomy ,Astronomy and Astrophysics ,Astrophysics ,01 natural sciences ,Planetary nebula ,Protoplanetary nebula ,Emission nebula ,Space and Planetary Science ,Extinction (optical mineralogy) ,0103 physical sciences ,Radiative transfer ,010303 astronomy & astrophysics - Published
- 2017
18. One-Dimensional Model of NGC6369 Planetary Nebula
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Sakine Rezaie Kehkhayee
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Physics ,Nebula ,Multidisciplinary ,Stellar mass ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,White dwarf ,Astrophysics::Cosmology and Extragalactic Astrophysics ,02 engineering and technology ,Astrophysics ,Planetary nebula ,Protoplanetary nebula ,030507 speech-language pathology & audiology ,03 medical and health sciences ,Stars ,Emission nebula ,Stellar mass loss ,0202 electrical engineering, electronic engineering, information engineering ,Astrophysics::Solar and Stellar Astrophysics ,020201 artificial intelligence & image processing ,Astrophysics::Earth and Planetary Astrophysics ,0305 other medical science ,Astrophysics::Galaxy Astrophysics - Abstract
Background/Objective: Planetary nebulas are glowing shell of gases that are ejected from the central star. The main objective of this paper is to present a model for NGC6369 planetary nebula. Methods: The central star is an old star (type O) with magnitudes between -3 and +5. These stars are quickly evolving into white dwarfs. In this paper, dynamic and ionized structure of NGC 6369 planetary nebula based on the interaction model of two stellar winds is discussed. Results: This high velocity wind will collide with a super stellar wind after a while, and creates a dense area, where this area is the same nebula under study. The stellar wind begins to blow at a mass loss rate of 1 x 10 -5 Msun/yr and a speed of 10 km/ s. After a while, the wind ends, and a high velocity wind starts blowing. Conclusion: If the problem assigned a typical velocity of 2000 km/ s, it has achieved a mass loss rate of 4.5 x 10 -9 Msun/yr.
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- 2017
19. Learning about the magnetar Swift J1834.9−0846 from its wind nebula
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Matthew G. Baring, Chryssa Kouveliotou, George Younes, Alice K. Harding, R. Gill, Jonathan Granot, and Josef Gelfand
- Subjects
High Energy Astrophysical Phenomena (astro-ph.HE) ,Physics ,Nebula ,Astrophysics::High Energy Astrophysical Phenomena ,Center (category theory) ,FOS: Physical sciences ,Astronomy ,Astronomy and Astrophysics ,Astrophysics ,Radius ,Magnetar ,01 natural sciences ,Emission nebula ,Space and Planetary Science ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Magnetohydrodynamics ,Astrophysics - High Energy Astrophysical Phenomena ,010306 general physics ,Supernova remnant ,Energy source ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
The first wind nebula around a magnetar was recently discovered in X-rays around Swift~J1834.9$-$0846. We study this magnetar's global energetics and the properties of its particle wind or outflows. At a distance of $\sim4\;$kpc, Swift~J1834.9$-$0846 is located at the center of the supernova remnant (SNR) W41 whose radius is $\sim 19\;$pc, an order of magnitude larger than that of the X-ray nebula ($\sim2\;$pc). The association with SNR W41 suggests a common age of $\sim5-100\;$kyr, while its spin-down age is $4.9$~kyr. A small natal kick velocity may partly explain why a wind nebula was detected around this magnetar but not around other magnetars, most of which appear to have larger kick velocities and may have exited their birth SNR. We find that the GeV and TeV source detected by Fermi/LAT and H.E.S.S., respectively, of radius $\sim11\;$pc is most likely of hadronic origin. The dynamics and internal structure of the nebula are examined analytically to explain the nebula's current properties. Its size may naturally correspond to the diffusion-dominated cooling length of the X-ray emitting $e^+e^-$ pairs. This may also account for the spectral softening of the X-ray emission from the nebula's inner to outer parts. Analysis of the X-ray synchrotron nebula implies that (i) the nebular magnetic field is $\gtrsim 11\;\mu$G (and likely $\lesssim30\;\mu$G), and (ii) the nebula is not powered predominantly by the magnetar's quiescent spin-down-powered MHD wind, but by other outflows that contribute most of its energy. The latter are most likely associated with the magnetar's bursting activity, and possibly dominated by outflows associated with its past giant flares. The energy source for the required outflows cannot be the decay of the magnetar's dipole field alone, and is most likely the decay of its much stronger internal magnetic field., Comment: 33 pages, 15 figures. Accepted for publication in MNRAS
- Published
- 2016
20. Discovery of an old nova remnant in the Galactic globular cluster M 22
- Author
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Tim-Oliver Husser, Jarle Brinchmann, Martin Roth, Peter M. Weilbacher, Sebastian Kamann, Ana Monreal-Ibero, Martin Wendt, Stefan Dreizler, Benjamin Giesers, Fabian Göttgens, Lutz Wisotzki, Kasper B. Schmidt, Roland Bacon, Wolfram Kollatschny, Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Nova remnant ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Emission nebula ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Emission spectrum ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics ,novae ,Physics ,cataclysmic variables ,Nebula ,[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] ,010308 nuclear & particles physics ,Institut für Physik und Astronomie ,White dwarf ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Radial velocity ,Astrophysics - Solar and Stellar Astrophysics ,techniques: imaging spectroscopy ,[SDU]Sciences of the Universe [physics] ,Space and Planetary Science ,Globular cluster ,Astrophysics of Galaxies (astro-ph.GA) ,ddc:520 ,Astrophysics::Earth and Planetary Astrophysics ,globular clusters: individual: NGC 6656 - Abstract
A nova is a cataclysmic event on the surface of a white dwarf in a binary system that increases the overall brightness by several orders of magnitude. Although binary systems with a white dwarf are expected to be overabundant in globular clusters (GCs) compared to the Galaxy, only two novae from Galactic globular clusters have been observed. We present the discovery of an emission nebula in the Galactic globular cluster M 22 (NGC 6656) in observations made with the integral-field spectrograph MUSE. We extract the spectrum of the nebula and use the radial velocity determined from the emission lines to confirm that the nebula is part of NGC 6656. Emission-line ratios are used to determine the electron temperature and density. It is estimated to have a mass of 1 to $17 \times 10^{-5}$ solar masses. This mass and the emission-line ratios indicate that the nebula is a nova remnant. Its position coincides with the reported location of a 'guest star', an ancient Chinese term for transients, observed in May 48 BCE. With this discovery, this nova may be one of the oldest confirmed extrasolar events recorded in human history., 7 pages, 3 figures; accepted for publication in Astronomy & Astrophysics
- Published
- 2019
21. Ablation and wind mass-loading in the born-again planetary nebula A 30
- Author
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Martín A. Guerrero, Lidia M. Oskinova, Detlef Schönberner, You-Hua Chu, Robert A. Gruendl, Matthias Steffen, Helge Todt, W.-R. Hamann, William P. Blair, and Nieves Ruiz
- Subjects
Physics ,medicine.medical_treatment ,Bubble ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Ablation ,Mass loading ,Planetary nebula ,Protoplanetary nebula ,Luminosity ,Emission nebula ,Space and Planetary Science ,medicine ,Astrophysics::Solar and Stellar Astrophysics ,ddc:520 ,Astrophysics::Earth and Planetary Astrophysics ,Mathematisch-Naturwissenschaftliche Fakultät ,Thermal pulse ,Astrophysics::Galaxy Astrophysics - Abstract
We present XMM-Newton and Chandra observations of the born-again planetary nebula A 30. These X-ray observations reveal a bright unresolved source at the position of the central star whose X-ray luminosity exceeds by far the model expectations for photospheric emission and for shocks within the stellar wind. We suggest that a “born-again hot bubble” may be responsible for this X-ray emission. Diffuse X-ray emission associated with the petal-like features and one of the H-poor knots seen in the optical is also found. The weakened emission of carbon lines in the spectrum of the diffuse emission can be interpreted as the dilution of stellar wind by mass-loading or as the detection of material ejected during a very late thermal pulse., Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 563
- Published
- 2019
22. Optical observations of the nearby galaxy NGC 2366 through narrowband H$��$ and SII filters. Supernova remnants status
- Author
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M. M. Vučetić, A. Ćiprijanović, N. Petrov, D. Onić, and Marko Pavlović
- Subjects
HII regions ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,lcsh:Astronomy ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,law.invention ,Telescope ,lcsh:QB1-991 ,Emission nebula ,Narrowband ,Observatory ,law ,0103 physical sciences ,Galaxies: individual: NGC2366 ,Supernova remnant ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,ISM: supernova remnants ,Physics ,010308 nuclear & particles physics ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Supernova ,Astrophysics of Galaxies (astro-ph.GA) ,Irregular galaxy ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present detection of 67 HII regions and two optical supernova remnant (SNR) candidates in the nearby irregular galaxy NGC 2366. The SNR candidates were detected by applying [SII]/H$\alpha$ ratio criterion to observations made with the 2-m RCC telescope at Rozhen National Astronomical Observatory in Bulgaria. In this paper we report coordinates, diameters, H$\alpha$ and [SII] fluxes for detected objects across the two fields of view in NGC 2366 galaxy. Using archival XMM-Newton observations we suggest possible X-ray counterparts of two optical SNR candidates. Also, we discard classification of two previous radio SNR candidates in this galaxy, since they appear to be background galaxies., Comment: 12 pages, 6 figures, accepted for publication in Serbian Astronomical Journal
- Published
- 2019
- Full Text
- View/download PDF
23. H-alpha spectra of the emission nebulae: NGC1499
- Author
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Erdinç Bolat and Muhittin Şahan
- Subjects
Physics ,Radial velocity ,Emission nebula ,Spectrometer ,Sky ,media_common.quotation_subject ,H-alpha ,Astrophysics ,Spectral line ,media_common ,Intensity (physics) ,Line (formation) - Abstract
Hα line spectra from the NGC1499 emission nebula have been investigated using DEFPOS spectrometer within this contribution. Some important physical properties from these spectra such as the mean line widths, radial velocities, the intensities and the mean emissions were obtained. The mean line width and radial velocity were found to be -10.77 km/sec 35.10 km/sec, respectively. The mean intensity and the emission measure values were found to be 530.53 R and mean 1039.41 cm−6pc, respectively. The mean LSR velocities and line widths were compared with some previous works from the literature. The intensity data were also compared with the data obtained from the maps created by using APER and SKY codes. We found that our results give similar variations with the VTSS (mean 430.91 R) map. We believe that these new results present a significant contribution to the literature.
- Published
- 2019
24. QSO MUSEUM I: a sample of 61 extended Ly α-emission nebulae surrounding z ̃ 3 quasars
- Author
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Elisabeta Lusso, J. Xavier Prochaska, Fabrizio Arrigoni Battaia, Sebastiano Cantalupo, Emanuele Paolo Farina, Joseph F. Hennawi, Jose Oñorbe, Battaia, F, Hennawi, J, Xavier Prochaska, J, Onorbe, J, Farina, E, Cantalupo, S, and Lusso, E
- Subjects
Astrophysics::High Energy Astrophysical Phenomena ,Dark matter ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Cosmology: observation ,Gravitation ,Emission nebula ,0103 physical sciences ,Surface brightness ,Galaxies: haloe ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Intergalactic medium ,Physics ,010308 nuclear & particles physics ,Galaxies: high-redshift ,Quasars: emission line ,Astronomy and Astrophysics ,Quasar ,Redshift ,Quasars: general ,Amplitude ,13. Climate action ,Space and Planetary Science ,Magnitude (astronomy) - Abstract
Motivated by the discovery of rare enormous Lyman α nebulae (ELAN) around z ̃ 2 quasars, we initiated a long-term campaign with the MUSE/VLT instrument to directly uncover the astrophysics of the gas around quasars. We present here the first 61 targets under the acronym QSO MUSEUM. These quasars are characterized by a median redshift z = 3.17, absolute i magnitude in the range -29.67 ≤ Mi(z = 2) ≤ -27.03, and different levels of radio-loudness. This sample unveils diverse specimens of Ly α nebulosities extending for tens of kpc around these quasars (average maximum projected distance of 80 kpc) above a surface brightness SB > 8.8 × 10-19 erg s-1 cm-2 arcsec-2(2σ). The bulk of the Ly α emission is within R < 50 kpc, and is characterized by relatively quiescent kinematics, with average velocity dispersions Ly α> < 400 km s-1. Therefore, the motions within all these Ly α nebulosities have amplitudes consistent with gravitational motions expected in dark matter haloes hosting quasars at these redshifts, possibly reflecting the complexity in propagating a fast wind on large scales. Our current data suggest a combination of photoionization and resonant scattering as powering mechanisms of the Ly α emission. We discover the first z ̃ 3 ELAN, confirming a very low probability ({̃ }1{{ per cent}}) of occurrence of such systems at these redshifts. Finally, we discuss the redshift evolution currently seen in extended Ly α emission around radio-quiet quasars from z ̃ 3 to z ̃ 2, concluding that it is possibly linked to a decrease of cool gas mass within the circumgalactic medium of quasars from z ̃ 3 to z ̃ 2, and thus to the balance of cool versus hot media. Overall, QSO MUSEUM opens the path to statistical surveys targeting the gas phases in quasars' haloes along cosmic times.
- Published
- 2019
25. Revealing the nature of central emission nebulae in the dwarf galaxy NGC 185
- Author
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D. Onić, Thomas G. Pannuti, Alexei Moiseev, N. Petrov, Dejan Urošević, Dragana Ilic, Bojan Arbutina, Oleg V. Egorov, and M. M. Vučetić
- Subjects
Physics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Andromeda Galaxy ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Planetary nebula ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Interstellar medium ,Supernova ,Emission nebula ,Space and Planetary Science ,Observatory ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Dwarf galaxy ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
In this paper we present new optical observations of the galaxy NGC 185 intended to reveal the status of supernova remnants (SNRs) in this dwarf companion of the Andromeda galaxy. Previously, it was reported that this galaxy hosts one SNR. Our deep photometric study with the 2m telescope at Rozhen National Astronomical Observatory using narrow-band H$\alpha$ and [SII] filters revealed complex structure of the interstellar medium in the center of the galaxy. To confirm the classification and to study the kinematics of the detected nebulae, we carried out spectroscopic observations using the SCORPIO multi-mode spectrograph at the 6m telescope at the Special Astrophysical Observatory of the Russian Academy of Science, both in low- and high-resolution modes. We also searched the archival X-ray and radio data for counterparts of the candidate SNRs identified by our optical observations. Our observations imply the presence of one more SNR, one possible HII region previously cataloged as part of an SNR, and the presence of an additional source of shock ionization in one low-brightness PN. We detected enhanced [SII]/H_alpha and [NII]/H_alpha line ratios, as well as relatively high (up to 90 km s$^{-1}$) expansion velocities of the two observed nebulae, motivating their classification as SNRs (with diameters of 45 pc and 50 pc), confirmed by both photometric and spectral observations. The estimated electron density of emission nebulae is 30 - 200 cm$^{-3}$. Archival XMM-Newton observations indicate the presence of an extended, low-brightness, soft source in projection of one of the optical SNRs, whereas the archival VLA radio image shows weak, unresolved emission in the center of NGC 185., Comment: 15 pages, 14 figures, accepted for publication in A&A
- Published
- 2019
- Full Text
- View/download PDF
26. The Interstellar Medium Family
- Author
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Steven J. Dick
- Subjects
Physics ,Interstellar medium ,Emission nebula ,Hydrogen ,chemistry ,Component (thermodynamics) ,Molecular cloud ,Ionization ,chemistry.chemical_element ,Molecule ,Physics::Atomic Physics ,Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
With this class of objects, we enter the Family of the interstellar medium. The interstellar medium consists of about 99% gas and 1% dust, and the gas component consists of three main classes of objects: cool atomic clouds composed mainly of neutral hydrogen (H I); hot ionized clouds also composed mainly of hydrogen, known as H II regions (S 24) and observed as emission nebulae; and cold molecular clouds (S 25) composed largely of hydrogen (H2) with a sprinkling of other molecules.
- Published
- 2019
27. A burst in a wind bubble and the impact on baryonic ejecta: high-energy gamma-ray flashes and afterglows from fast radio bursts and pulsar-driven supernova remnants
- Author
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Kazumi Kashiyama, Kohta Murase, and Peter Mészáros
- Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Magnetar ,01 natural sciences ,Radio telescope ,Emission nebula ,Pulsar ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Physics ,Nebula ,010308 nuclear & particles physics ,Fast radio burst ,Astronomy ,Astronomy and Astrophysics ,Supernova ,Neutron star ,Space and Planetary Science ,Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Tenuous wind bubbles, which are formed by the spin-down activity of central compact remnants, are relevant in some models of fast radio bursts (FRBs) and super-luminous supernovae. We study their high-energy signatures, focusing on the role of pair-enriched bubbles produced by young magnetars, rapidly-rotating neutron stars, and magnetized white dwarfs. (i) First, we study the nebular properties and the conditions allowing for escape of high-energy gamma-rays and radio waves, showing that their escape is possible for nebulae with ages of >10-100 yr. In the rapidly-rotating neutron star scenario, we find that radio emission from the quasi-steady nebula itself may be bright enough to be detected especially at sub-mm frequencies, which is relevant as a possible counterpart of pulsar-driven SNe and FRBs. (ii) Second, we consider the fate of bursting emission in the nebulae. We suggest that an impulsive burst may lead to a highly relativistic flow, which would interact with the nebula. If the shocked nebula is still relativistic, pre-existing non-thermal particles in the nebula can be significantly boosted by the forward shock, leading to short-duration (maybe millisecond or longer) high-energy gamma-ray flashes. Possible dissipation at the reverse shock may also lead to gamma-ray emission. (iii) After such flares, interactions with the baryonic ejecta may lead to afterglow emission with a duration of days to weeks. In the magnetar scenario, this burst-in-bubble model leads to the expectation that nearby (, 15 pages, 6+1 figures, 1 table, published in MNRAS (arXiv on 03/28/2016), free-free absorption recalculated with more realistic parameters (conclusions unchanged), arXiv version with comments on FRB 121102
- Published
- 2016
28. Two Interesting Southern Objects
- Author
-
A. L. Gyulbudaghian
- Subjects
Physics ,010308 nuclear & particles physics ,Star formation ,Astronomy ,Astronomy and Astrophysics ,Bipolar nebula ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Star (graph theory) ,01 natural sciences ,Planetary nebula ,Protoplanetary nebula ,Stars ,Emission nebula ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
Two southern objects are studied. The first, the planetary nebula PK 349-01.1, is of interest because it has a chain of jets ejected from the central star. 12C(1-0) observations of the vicinity of this object reveal red- and blue-shifted molecular outflows. The second object is a star formation region consisting of two groups of IR stars. These groups have a trapezium-like configuration. Two stars in one of these groups are associated with a ring-shaped nebulae. This star formation region is associated with a new radial system of dark globules.
- Published
- 2016
29. X-ray emission from the Wolf–Rayet bubble NGC 6888 – II.XMM–NewtonEPIC observations
- Author
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Daniel Tafoya, S. J. Arthur, Martín A. Guerrero, You-Hua Chu, Jesús A. Toalá, and Robert A. Gruendl
- Subjects
Physics ,Range (particle radiation) ,Electron density ,Nebula ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,Bubble ,FOS: Physical sciences ,Astronomy ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Plasma ,Astrophysics ,01 natural sciences ,Luminosity ,Wolf–Rayet star ,Emission nebula ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics - Abstract
We present deep XMM-Newton EPIC observations of the Wolf-Rayet (WR) bubble NGC6888 around the star WR136. The complete X-ray mapping of the nebula confirms the distribution of the hot gas in three maxima spatially associated with the caps and northwest blowout hinted at by previous Chandra observations. The global X-ray emission is well described by a two-temperature optically thin plasma model $T_1$=1.4$\times$10$^{6}$ K, $T_{2}$=8.2$\times$10$^{6}$ K) with a luminosity of $L_{\mathrm{X}}$=7.8$\times$10$^{33}$ erg s$^{-1}$ in the 0.3--1.5 keV energy range. The rms electron density of the X-ray-emitting gas is estimated to be $n_\mathrm{e}$=0.4 cm$^{-3}$. The high-quality observations presented here reveal spectral variations within different regions in NGC6888, which allowed us for the first time to detect temperature and/or nitrogen abundance inhomogeneities in the hot gas inside a WR nebula. One possible explanation for such spectral variations is that the mixing of material from the outer nebula into the hot bubble is less efficient around the caps than in other nebular regions., 10 pages, 4 figures, 2 tables; Accepted to MNRAS
- Published
- 2016
30. Dust processing in the Carina nebula region
- Author
-
Yoko Okada, Takashi Onaka, and Tamami I. Mori
- Subjects
Physics ,Nebula ,COSMIC cancer database ,Infrared ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Galaxy ,Emission nebula ,Space and Planetary Science ,Ionization ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Spectroscopy ,Astrophysics::Galaxy Astrophysics ,Line (formation) - Abstract
Dust processing in the Carina nebula is investigated based on mid- to far-infrared spectroscopy with Infrared Space Observatory (ISO). Mapping observations over a central 40 ′ × 20 ′ area of the nebula with PHT-S, SWS, and LWS onboard ISO not only reveal spectroscopically that the mid-infrared unidentified infrared (UIR) bands at 6.2, 7.7, 8.6, and 11.3 μm are absent in the ionized region, but also indicate that the 11.3 μm may behave differently from the other three UIR bands near the edge of the ionized region, suggesting a variation either in the size distribution or in the ionization fraction of the band carriers. The correlation of [NII]122 μm and [SiII]35 μm line emissions observed with SWS and LWS is reinvestigated based on the recent atomic data as well as the latest cosmic abundance, suggesting that a large fraction ( > 70 %), if not all, of silicon returns to the gas phase in the Carina nebula, suggesting that silicates cannot survive under harsh conditions, such as massive star-forming regions. The present observations clearly show dust processing taking place in active regions in the Galaxy.
- Published
- 2015
31. Detection of the Red Supergiant Wind from the Progenitor of Cassiopeia A
- Author
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John C. Raymond, Robert A. Fesen, Dan Milisavljevic, Kathryn E. Weil, Daniel J. Patnaude, Roger A. Chevalier, and Christopher L. Gerardy
- Subjects
H II region ,010504 meteorology & atmospheric sciences ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,01 natural sciences ,Emission nebula ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Red supergiant ,Ejecta ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics ,0105 earth and related environmental sciences ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Physics ,Astronomy and Astrophysics ,Cassiopeia A ,Supernova ,Astrophysics - Solar and Stellar Astrophysics ,13. Climate action ,Space and Planetary Science ,Supergiant ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
Cassiopeia A (Cas A) is one of the best studied young Galactic supernova remnants. While providing a rare opportunity to study in detail the remnant of a Type IIb supernova, questions remain regarding the nature of its progenitor, its mass-loss history, and its pre-SN evolution. Here we present an optical investigation of the circumstellar environment around Cas A and find clumpy and filamentary Halpha emission nebulosities concentrated 10-15 pc (10-15 arcminutes) to the north and east. First reported by Minkowski as a faint H II region, these nebulosities exhibit distinct morphological and spectroscopic properties relative to the surrounding diffuse emissions. Compared to neighboring H II regions, these nebulae show stronger [N II] 6548, 6583 A and [S II] 6716, 6731 A emissions relative to Halpha. We show that Cas A's highest-velocity ejecta knots are interacting with some of the closest projected emission nebulae, thus providing strong evidence that these nebulae lie at the same distance as the remnant. We interpret these surrounding nebulosities to be the remains of the progenitor's red supergiant wind which accumulated against the southern edge of a large extended H II region located north of Cas A. Our findings are consistent with the view that Cas A's progenitor underwent considerable mass-loss, first from a fast main-sequence wind, then from a slower, clumpy red supergiant wind, and finally from a brief high-velocity wind, like that from a yellow supergiant., Comment: 19 pages, 9 figures, accepted to ApJ
- Published
- 2020
32. Galactic Hα emission line studies using DEFPOS at the TÜBİTAK National Observatory
- Author
-
Muhittin Sahan
- Subjects
Physics ,Emission nebula ,Observatory ,General Physics and Astronomy ,Astronomy ,H-alpha ,Emission spectrum ,Planetary nebula ,Open cluster - Published
- 2018
33. MMT Spectroscopy of Supernova Remnant Candidates in M33
- Author
-
John C. Raymond, William P. Blair, Dan Milisavljevic, Knox S. Long, and P. Frank Winkler
- Subjects
Physics ,010308 nuclear & particles physics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,01 natural sciences ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Supernova ,Emission nebula ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,Emission spectrum ,Surface brightness ,Supernova remnant ,Spectroscopy ,010303 astronomy & astrophysics ,Line (formation) - Abstract
To date, over 220 emission nebulae in M33 have been identified as supernova remnants (SNRs) or SNR candidates, principally through [SII]:Halpha line ratios that are elevated compared to those in H II regions. In many cases, the determination of a high [SII]:Halpha line ratio was made using narrow-band interference filter images and has not been confirmed spectroscopically. Here we present MMT 6.5 m optical spectra that we use to measure [SII]:Halpha and other line ratios in an attempt to determine the nature of these suggested candidates. Of the 197 objects in our sample, 120 have no previously published spectroscopic observations. We confirm that the majority of candidate SNRs have emission line ratios characteristic of SNRs. While no candidates show Doppler-broadened lines expected from young, ejecta-dominated SNRs (> 1000 km/s), a substantial number do exhibit lines that are broader than H II regions. We argue that the majority of the objects with high [SII]:Halpha line ratios (>0.4) are indeed SNRs, but at low surface brightness the distinction between H II regions and SNRs becomes less obvious, and additional criteria, such as X-ray detection, are needed. We discuss the properties of the sample as a whole and compare it with similar samples in other nearby galaxies., 43 pages, including 2 tables and 14 figures. Accepted for publication in ApJ
- Published
- 2018
- Full Text
- View/download PDF
34. An ALMA 3mm continuum census of Westerlund 1
- Author
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Danielle Fenech, Ignacio Negueruela, R. K. Prinja, J. S. Clark, Sean M. Dougherty, Francisco Najarro, B. W. Ritchie, A. Richards, H. Andrews, Universidad de Alicante. Departamento de Física Aplicada, and Astrofísica Estelar (AE)
- Subjects
open clusters and associations: individual: Westerlund 1 ,Hypergiant ,Astrophysics::High Energy Astrophysical Phenomena ,Population ,evolution [Stars] ,FOS: Physical sciences ,stars [Submillimeter] ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Stellar classification ,01 natural sciences ,Emission nebula ,Galaxy groups and clusters ,0103 physical sciences ,individual: Westerlund 1 [Open clusters and associations] ,Astrophysics::Solar and Stellar Astrophysics ,stars: evolution ,010306 general physics ,education ,010303 astronomy & astrophysics ,Stellar evolution ,Astrophysics::Galaxy Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astronomía y Astrofísica ,Physics ,education.field_of_study ,Astronomy and Astrophysics ,submillimeter: stars ,Stars ,Astrophysics - Solar and Stellar Astrophysics ,13. Climate action ,Space and Planetary Science ,Astrophysics::Earth and Planetary Astrophysics ,Supergiant - Abstract
Massive stars play an important role in both cluster and galactic evolution and the rate at which they lose mass is a key driver of both their own evolution and their interaction with the environment up to and including their SNe explosions. Young massive clusters provide an ideal opportunity to study a co-eval population of massive stars. We performed 3mm continuum observations with the Atacama Large Millimetre/submillimetre Array of the Galactic cluster Westerlund 1, to study the constituent massive stars and determine mass-loss rates for the diverse post-main sequence population. We detected emission from 50 stars in Westerlund 1, comprising all 21 Wolf-Rayets within the field of view, eight cool and 21 OB super-/hypergiants. Emission nebulae were associated with a number of the cool hypergiants while, unexpectedly, a number of hot stars also appear spatially resolved. We measured the mass-loss rates for a unique population of massive post-main sequence stars at every stage of evolution, confirming a significant increase as stars transition from OB supergiant to WR states. The range of spectral types exhibited provides a critical test of radiatively driven wind theory and the reality of the bi-stability jump. The extreme mass-loss rate inferred for the interacting binary Wd1-9 in comparison to other cluster members confirmed the key role binarity plays in massive stellar evolution. The presence of compact nebulae around a number of OB and WR stars is unexpected; by analogy to the cool super-/hypergiants we attribute this to confinement and sculpting of the stellar wind via interaction with the intra-cluster medium/wind. Given the morphology of core collapse SNe depend on the nature of the pre-explosion circumstellar environment, if this hypothesis is correct then the properties of the explosion depend not just on the progenitor, but also the environment in which it is located., Comment: 35 pages, 20 figures, accepted for publication in A&A
- Published
- 2018
- Full Text
- View/download PDF
35. An optical investigation of the Dumbbell planetary nebula (M27, NGC 6583)
- Author
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Laurent Drissen, Dominic Lagrois, Thomas Martin, Laurie Rousseau-Nepton, Alexandre Alarie, and Gilles Joncas
- Subjects
Physics ,Emission nebula ,Space and Planetary Science ,Astronomy ,Astronomy and Astrophysics ,Bipolar nebula ,Dumbbell ,Astrophysics ,Planetary nebula ,Protoplanetary nebula - Published
- 2015
36. On the integrated continuum radio spectrum of supernova remnant W44 (G34.7-0.4): New insights from Planck
- Author
-
D. Onić
- Subjects
lcsh:Astronomy ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Radio spectrum ,law.invention ,lcsh:QB1-991 ,symbols.namesake ,Emission nebula ,Spitzer Space Telescope ,law ,0103 physical sciences ,Planck ,Supernova remnant ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,ISM: supernova remnants ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Physics ,ISM: individual (W44) ,Continuum (measurement) ,010308 nuclear & particles physics ,Spinning dust ,Astronomy and Astrophysics ,Synchrotron ,radio continuum: ISM ,symbols ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
In this paper, the integrated continuum radio spectrum of supernova remnant (SNR) W44 was analyzed up to 70 GHz, testing the different emission models that can be responsible for its particular shape. The observations by the Planck space telescope made possible to analyze the high frequency part of radio emission from SNRs. Although the quality of radio continuum spectrum (a high scatter of data points at same frequencies) prevents us to make definite conclusions, the possibility of spinning dust emission detection towards this remnant is emphasized. In addition, a concave-down feature, due to synchrotron losses, can not be definitely dismissed by the present knowledge of the integrated radio continuum spectrum of this SNR., submitted to Serb. Astron. J.; minor revision
- Published
- 2015
37. Echelle spectroscopy and photoionization modelling of the entire planetary nebula NGC 6210
- Author
-
V. Escalante, Reginald J. Dufour, Mónica Rodríguez, and Joaquín Bohigas
- Subjects
Physics ,Emission nebula ,Space and Planetary Science ,Astronomy ,Astronomy and Astrophysics ,Astrophysics ,Photoionization ,Spectroscopy ,Planetary nebula - Published
- 2014
38. Ionization structure of the nebula NGC 6857
- Author
-
E. K. Aimuratov, F. K. Rspaev, and L. N. Kondrat’eva
- Subjects
Physics ,Nebula ,Star formation ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Central region ,Emission nebula ,Space and Planetary Science ,Ionization ,Astrophysics::Solar and Stellar Astrophysics ,Angular resolution ,Emission spectrum ,Surface brightness ,Astrophysics::Galaxy Astrophysics - Abstract
We present the results of our spectroscopic studies of the nebula NGC 6857 located in a region of current star formation. Data on the surface brightness distribution in the central region of the nebula (∼60″ × 60″) in the Hα, Hβ, [OIII], 5007 A, [N II], 6548, 6583 A, [S II], 6717, 6731 A, and He I, 6678 A lines have been obtained with an angular resolution of ∼4.″5 × 4.″5. The zones of maximum surface brightness and the region of maximum gas ionization ratio are located 12″ south of the central star, which may suggest the existence of a second gas ionization source.
- Published
- 2014
39. Brightening event seen in observations of Jupiter’s extended sodium nebula
- Author
-
Mizuki Yoneda, Takeshi Sakanoi, S. Okano, Masato Kagitani, and Fuminori Tsuchiya
- Subjects
Physics ,geography ,Brightness ,Nebula ,geography.geographical_feature_category ,Astrophysics::High Energy Astrophysical Phenomena ,Sodium ,Conjunction (astronomy) ,Astronomy ,chemistry.chemical_element ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Protoplanetary nebula ,Jupiter ,Emission nebula ,Volcano ,chemistry ,Space and Planetary Science ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
Jupiter’s sodium nebula, which originates from Io’s volcanic gas, shows variations in its brightness due to the volcanic activity on Io. Imaging observation of D-line brightness in the sodium nebula was performed from 2013 through 2015 in a conjunction with the HISAKI mission. The D-line brightness of the sodium nebula had been stably faint and dim until January 2015, but it showed a distinct enhancement from February through March, 2015. The brightness increased by three times during this enhancement. Details in variations of Jupiter’s sodium nebula are shown in this paper.
- Published
- 2015
40. New ATCA, ALMA and VISIR observations of the candidate LBV SK -67 266 (S61): the nebular mass from modelling 3D density distributions
- Author
-
Corrado Trigilio, Paolo Leto, Roberta Paladini, A. Ingallinera, R. Nikutta, G. Umana, F. Cavallaro, N. Phillips, C. Agliozzo, Alberto Noriega-Crespo, Carla Buemi, F. Bufano, G. Pignata, ITA, USA, and CHL
- Subjects
statistical [Methods] ,individual: (SK -67 266) [Stars] ,Reflection nebula ,Astrophysics::High Energy Astrophysical Phenomena ,Extinction (astronomy) ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,law.invention ,Protoplanetary nebula ,Telescope ,Emission nebula ,law ,0103 physical sciences ,massive [Stars] ,Astrophysics::Solar and Stellar Astrophysics ,010306 general physics ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics ,Physics ,Very Large Telescope ,Nebula ,mass-loss [Stars] ,Astronomy ,Astronomy and Astrophysics ,Circumstellar matter ,Astrophysics - Astrophysics of Galaxies ,Planetary nebula ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,stars [Radio continuum] ,Astrophysics::Earth and Planetary Astrophysics - Abstract
We present new observations of the nebula around the Magellanic candidate Luminous Blue Variable S61. These comprise high-resolution data acquired with the Australia Telescope Compact Array (ATCA), the Atacama Large Millimetre/Submillimetre Array (ALMA), and VISIR at the Very Large Telescope (VLT). The nebula was detected only in the radio, up to 17 GHz. The 17 GHz ATCA map, with 0.8 arcsec resolution, allowed a morphological comparison with the H$\alpha$ Hubble Space Telescope image. The radio nebula resembles a spherical shell, as in the optical. The spectral index map indicates that the radio emission is due to free-free transitions in the ionised, optically thin gas, but there are hints of inhomogeneities. We present our new public code RHOCUBE to model 3D density distributions, and determine via Bayesian inference the nebula's geometric parameters. We applied the code to model the electron density distribution in the S61 nebula. We found that different distributions fit the data, but all of them converge to the same ionised mass, ~0.1 $\rm M\odot$, which is an order of magnitude smaller than previous estimates. We show how the nebula models can be used to derive the mass-loss history with high-temporal resolution. The nebula was probably formed through stellar winds, rather than eruptions. From the ALMA and VISIR non-detections, plus the derived extinction map, we deduce that the infrared emission observed by space telescopes must arise from extended, diffuse dust within the ionised region., Comment: 17 pages, 9 figures. Authors list corrected. In press in MNRAS. RHOCUBE code available online ( https://github.com/rnikutta/rhocube )
- Published
- 2017
41. Bursts of the Crab Nebula gamma-ray emission at high and ultra-high energies
- Author
-
A. S. Lidvansky
- Subjects
Physics ,Astrophysics::High Energy Astrophysical Phenomena ,QC1-999 ,Gamma ray ,Astrophysics::Instrumentation and Methods for Astrophysics ,Astronomy ,Astrophysics ,01 natural sciences ,Spectral line ,Emission nebula ,Air shower ,Crab Nebula ,0103 physical sciences ,Gamma ray detectors ,Satellite ,010306 general physics ,Gamma-ray burst ,010303 astronomy & astrophysics - Abstract
Characteristics of the flares of gamma rays detected from the Crab Nebula by the AGILE and Fermi-LAT satellite instruments are compared with those of a gamma ray burst recorded by several air shower arrays on February 23, 1989 and with one recent observation made by the ARGO-YBJ array. It is demonstrated that though pulsar-periodicity and energy spectra of emissions at 100 MeV (satellite gamma ray telescopes) and 100 TeV (EAS arrays) are different, their time structures seem to be similar. Moreover, maybe the difference between “flares” and “waves” recently found in the Crab Nebula emission by the AGILE team also exists at ultra-high energies.
- Published
- 2017
42. The Crab nebula energy origin and its high frequency radiation spectra
- Author
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Zaza Osmanov, David Shapakidze, N. Chkheidze, George Machabeli, and Andria Rogava
- Subjects
Physics ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,Astrophysics ,Condensed Matter Physics ,01 natural sciences ,Spectral line ,Emission nebula ,Crab Nebula ,0103 physical sciences ,Physics::Accelerator Physics ,010306 general physics ,High frequency radiation ,010303 astronomy & astrophysics ,Energy (signal processing) - Abstract
In the present work there is presented a model describing transfer of the Crab pulsar’s spin-down energy into the powerful synchrotron emission of the nebula. The process of the energy transfer consists of several consecutive stages. The physical processes underlying the theoretical model provide us with the synchrotron emission spectrum, which fits well with the observed one.
- Published
- 2016
43. Deciphering the bipolar planetary nebula Abell 14 with 3D ionization and morphological studies
- Author
-
Hektor Monteiro, Matt Redman, N. Clyne, Denise R. Gonçalves, Steven Williams, Stavros Akras, and P. Boumis
- Subjects
catalog ,010504 meteorology & atmospheric sciences ,Astrophysics::High Energy Astrophysical Phenomena ,distances ,binary ,FOS: Physical sciences ,Bipolar nebula ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Luminosity ,Emission nebula ,intermediate-mass stars ,0103 physical sciences ,evolution ,agb stars ,Astrophysics::Solar and Stellar Astrophysics ,Emission spectrum ,010303 astronomy & astrophysics ,photoionization ,Astrophysics::Galaxy Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,0105 earth and related environmental sciences ,Physics ,Nebula ,abundances ,ism: abundances ,suwt 2 ,Astronomy ,White dwarf ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Planetary nebula ,galactic bulge region ,Stars ,ism: kinematics and dynamics ,Astrophysics - Solar and Stellar Astrophysics ,binaries: general ,Space and Planetary Science ,planetary nebulae: individual: abell 14 ,Astrophysics of Galaxies (astro-ph.GA) ,Astrophysics::Earth and Planetary Astrophysics - Abstract
Abell 14 is a poorly studied object despite being considered a born again planetary nebula. We performed a detailed study of its 3D morphology and ionization structure using the SHAPE and MOCASSIN codes. We found that Abell 14 is a highly evolved, bipolar nebula with a kinematical age of $\sim$19,400 yr for a distance of 4 kpc. The high He abundance, and N/O ratio indicate a progenitor of 5 $M_{\odot}$ that has experienced the third dredge-up and hot bottom burning phases. The stellar parameters of the central source reveal a star at a highly evolved stage near to the white dwarf cooling track, being inconsistent with the born again scenario. The nebula shows unexpectedly strong [N I] $\lambda 5200$ and [O I] $\lambda 6300$ emission lines indicating possible shock interactions. Abell 14 appears to be a member of a small group of highly evolved, extreme Type-I PNe. The members of this group lie at the lower-left corner of the PNe regime on the [N II]/H$\alpha$ vs. [S II]/H$\alpha$ diagnostic diagram, where shock--excited regions/objects are also placed. The low luminosity of their central stars, in conjunction with the large physical size of the nebulae, result in a very low photo-ionization rate, which can make any contribution of shock interaction easily perceptible, even for small velocities., Comment: 12 pages, 9 figures and 4 tables, accepted for publication in MNRAS
- Published
- 2016
- Full Text
- View/download PDF
44. PAH and H_2 emission in the Ring Nebula
- Author
-
José Cernicharo, Olivier Berné, P. Pilleri, Nick L. J. Cox, Christine Joblin, Los Alamos National Laboratory (LANL), Centre d'étude spatiale des rayonnements (CESR), Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Spanish National Research Council [Madrid] (CSIC), Univ Toulouse UPS, Ctr Etud Spatiale Rayonnements, F-31062 Toulouse 9, France, and Centre Etud Spatiale Rayonnements Toulouse
- Subjects
History ,010504 meteorology & atmospheric sciences ,Infrared ,Polycyclic aromatic hydrocarbon ,Context (language use) ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Ring (chemistry) ,01 natural sciences ,Education ,Emission nebula ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,010303 astronomy & astrophysics ,Spectrograph ,Astrophysics::Galaxy Astrophysics ,ComputingMilieux_MISCELLANEOUS ,0105 earth and related environmental sciences ,Physics ,chemistry.chemical_classification ,Nebula ,Astronomy ,Planetary nebula ,Computer Science Applications ,chemistry ,13. Climate action ,Astrophysics::Earth and Planetary Astrophysics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
This paper presents the Spitzer IRS (Infra Red Spectrograph) detection of mid-infrared polycyclic aromatic hydrocarbon (PAH) emission features and H2 associated with dense knots in the ring of the "oxygen-rich" (C/O~0.6-0.8) planetary nebula (PN) NGC6720 (Ring Nebula). We explored a further three oxygen-rich extended PNe with similar dataset available. These turned out to be non-detection of PAHs, although two of these do contain H2 emission knots. The presence of PAHs is discussed in the context of a bottom-up formation mechanism, in which first small hydrocarbons, and later PAHs, are formed in warm dense knots inside the ionised regions of PNe.
- Published
- 2016
45. Observations of the planetary nebula RWT 152 with OSIRIS/GTC
- Author
-
Luis F. Miranda, Enrique Solano, A. Ulla, A. Aller, Lorenzo Olguín, Ministerio de Economía y Competitividad (España), European Commission, Xunta de Galicia, Ministerio de Educación, Cultura y Deporte (España), and Universidad de Vigo
- Subjects
Astrophysics::High Energy Astrophysical Phenomena ,Subdwarfs ,FOS: Physical sciences ,Bipolar nebula ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,ISM: abundances ,Spectral line ,Emission nebula ,individual: RWT 152 [Planetary nebulae] ,0103 physical sciences ,Peculiar velocity ,Planetary nebulae: individual: RWT 152 ,Astrophysics::Solar and Stellar Astrophysics ,Emission spectrum ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics ,Physics ,abundances [ISM] ,Nebula ,010308 nuclear & particles physics ,Astronomy ,Astronomy and Astrophysics ,Planetary nebula ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Halo ,Astrophysics::Earth and Planetary Astrophysics - Abstract
10 pages, 6 figures, RWT 152 is one of the few known planetary nebulae with an sdO central star. We present subarcsecond red tunable filterHa imaging and intermediate-resolution, long-slit spectroscopy of RWT 152 obtained with OSIRIS/GTC (Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy/Gran Telescopio Canarias) with the goal of analysing its properties. The Ha image reveals a bipolar nebula with a bright equatorial region and multiple bubbles in the main lobes. A faint circular halo surrounds the main nebula. The nebular spectra reveal a very low excitation nebula with weak emission lines from H+, He+ and double-ionized metals, and absence of emission lines from neutral and single-ionized metals, except for an extremely faint [NII] lambda 6584 emission line. These spectra may be explained if RWT 152 is a density-bounded planetary nebula. Low nebular chemical abundances of S, O, Ar, N and Ne are obtained in RWT 152, which, together with the derived high peculiar velocity (similar to 92-131 km s(-1)), indicate that this object is a halo planetary nebula. The available data are consistent with RWT 152 evolving from a low-mass progenitor (similar to 1 M-circle dot) formed in a metal-poor environment., This paper has been partially supported by grant AYA 2011-24052 (AA, ES), AYA 2011-30228-C3-01 (LFM), ESP2014-55996-C2-2-R (AU) and AYA2014-57369-C3-3-P (LFM) of the Spanish MINECO (all them co-funded by FEDER funds). We also acknowledge support from grant IN-CITE09 312191PR (AU, LFM, AA) of Xunta de Galicia, partially funded by FEDER funds, from grant PRX15/00511 (AU) of the Spanish MECD, and from grant 12VI20 (AU, LFM, AA) of the University of Vigo. AA also acknowledges support from FONDECYT through postdoctoral grant 3160364. This research has made use of the SIMBAD data base, operated at the CDS, Strasbourg (France), Aladin, NASA's Astrophysics Data System Bibliographic Services and the Spanish Virtual Observatory supported from the Spanish MINECO through grant AYA2011-24052.
- Published
- 2016
46. What Are All These Different Types of Nebulae, and What Details Can I See in Them with My Telescope?
- Author
-
Steven R. Coe
- Subjects
Physics ,Nebula ,Reflection nebula ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Double star ,Planetary nebula ,Supernova ,Emission nebula ,Dark nebula ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Supernova remnant ,Astrophysics::Galaxy Astrophysics - Abstract
There are five types of cloudy or nebulous objects in the sky: planetary nebulae, emission nebulae, reflection nebulae, dark nebulae and supernova remnants. I will cover the planetaries in the next chapter and discuss the other four types here. Even though all these objects appear as fuzzy and diffuse in the telescope, there are different mechanisms at work among the differing types of nebulae. So, let’s see what makes each type of nebula glow in the dark (except dark nebulae, of course).
- Published
- 2016
47. NGC 6778: Strengthening the link between extreme abundance discrepancy factors and central star binarity in planetary nebulae
- Author
-
Jorge García-Rojas, Henri M. J. Boffin, Romano L. M. Corradi, David Jones, and Roger Wesson
- Subjects
Physics ,Nebula ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Star (graph theory) ,01 natural sciences ,Planetary nebula ,Optical spectra ,Spectral line ,Emission nebula ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Abundance (ecology) ,Excited state ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics - Abstract
We present new optical spectra of the nearby, bright, planetary nebula NGC 6778. The nebula has been known to emit strong recombination lines for more than 40 years but this is the first detailed study of its abundances. Heavy element abundances derived from recombination lines are found to exceed those from collisionally excited lines by a factor of ~20 in an integrated spectrum of the nebula, which is among the largest known abundance discrepancy factors. Spatial analysis of the spectra shows that the abundance discrepancy factor is strongly, centrally peaked, reaching ~40 close to the central star. The central star of NGC 6778 is known to be a short period binary, further strengthening the link between high nebular abundance discrepancy factors and central star binarity., 11 pages, 5 figures, 6 tables. Accepted for publication in the main journal of MNRAS
- Published
- 2015
48. Evidence for Reduced, Carbon-rich Regions in the Solar Nebula from an Unusual Cometary Dust Particle
- Author
-
Larry R. Nittler, A. L. David Kilcoyne, Bradley T. De Gregorio, and Rhonda M. Stroud
- Subjects
Physics ,Solar System ,Astrochemistry ,Comet ,Astronomy and Astrophysics ,engineering.material ,010502 geochemistry & geophysics ,01 natural sciences ,Astrobiology ,Interplanetary dust cloud ,Emission nebula ,Space and Planetary Science ,Chondrite ,0103 physical sciences ,Enstatite ,engineering ,Formation and evolution of the Solar System ,010303 astronomy & astrophysics ,0105 earth and related environmental sciences - Abstract
Author(s): De Gregorio, BT; Stroud, RM; Nittler, LR; Kilcoyne, ALD | Abstract: Geochemical indicators in meteorites imply that most formed under relatively oxidizing conditions. However, some planetary materials, such as the enstatite chondrites, aubrite achondrites, and Mercury, were produced in reduced nebular environments. Because of large-scale radial nebular mixing, comets and other Kuiper Belt objects likely contain some primitive material related to these reduced planetary bodies. Here, we describe an unusual assemblage in a dust particle from comet 81P/Wild 2 captured in silica aerogel by the NASA Stardust spacecraft. The bulk of this ∼20 μm particle is comprised of an aggregate of nanoparticulate Cr-rich magnetite, containing opaque sub-domains composed of poorly graphitized carbon (PGC). The PGC forms conformal shells around tiny 5-15 nm core grains of Fe carbide. The C, N, and O isotopic compositions of these components are identical within errors to terrestrial standards, indicating a formation inside the solar system. Magnetite compositions are consistent with oxidation of reduced metal, similar to that seen in enstatite chondrites. Similarly, the core-shell structure of the carbide + PGC inclusions suggests a formation via FTT reactions on the surface of metal or carbide grains in warm, reduced regions of the solar nebula. Together, the nanoscale assemblage in the cometary particle is most consistent with the alteration of primary solids condensed from a C-rich, reduced nebular gas. The nanoparticulate components in the cometary particle provide the first direct evidence from comets of reduced, carbon-rich regions that were present in the solar nebula.
- Published
- 2017
49. New expansion rate measurements of the Crab Nebula in radio and optical
- Author
-
Michael Bietenholz and R. L. Nugent
- Subjects
High Energy Astrophysical Phenomena (astro-ph.HE) ,Physics ,Nebula ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astronomy ,Astronomy and Astrophysics ,Astrophysics ,Synchrotron ,law.invention ,Protoplanetary nebula ,Supernova ,Crab Nebula ,Emission nebula ,Pulsar ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,law ,Physics::Accelerator Physics ,Astrophysics::Solar and Stellar Astrophysics ,Ejecta ,Astrophysics - High Energy Astrophysical Phenomena ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics - Abstract
We present new radio measurements of the expansion rate of the Crab nebula's synchrotron nebula over a ~30-yr period. We find a convergence date for the radio synchrotron nebula of CE 1255 +- 27. We also re-evaluated the expansion rate of the optical line emitting filaments, and we show that the traditional estimates of their convergence dates are slightly biased. Using an un-biased Bayesian analysis, we find a convergence date for the filaments of CE 1091 +- 34 (~40 yr earlier than previous estimates). Our results show that both the synchrotron nebula and the optical line-emitting filaments have been accelerated since the explosion in CE 1054, but that the synchrotron nebula has been relatively strongly accelerated, while the optical filaments have been only slightly accelerated. The finding that the synchrotron emission expands more rapidly than the filaments supports the picture that the latter are the result of the Rayleigh-Taylor instability at the interface between the pulsar-wind nebula and the surrounding freely-expanding supernova ejecta, and rules out models where the pulsar wind bubble is interacting directly with the pre-supernova wind of the Crab's progenitor., Accepted for publication in MNRAS; 8 pages
- Published
- 2015
50. The blue supergiant MN18 and its bipolar circumstellar nebula
- Author
-
Jochen Greiner, Eva K. Grebel, A. Y. Kniazev, Vasilii V. Gvaramadze, Joachim M. Bestenlehner, J. Bodensteiner, Norbert Langer, Yuri Beletsky, and L. N. Berdnikov
- Subjects
Reflection nebula ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Bipolar nebula ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,circumstellar matter ,individual: [GKF2010] MN109 [stars] ,Emission nebula ,Blue supergiant ,Astrophysics::Solar and Stellar Astrophysics ,individual: [GKF2010] MN56 [stars] ,winds, outflows [stars] ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics ,Physics ,Nebula ,OB star ,Astronomy ,supergiants ,Astronomy and Astrophysics ,individual: Lynga 3 [open clusters and associations] ,Star cluster ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,individual: [GKF2010] MN18 [stars] ,Astrophysics::Earth and Planetary Astrophysics ,Supergiant - Abstract
We report the results of spectrophotometric observations of the massive star MN18 revealed via discovery of a bipolar nebula around it with the Spitzer Space Telescope. Using the optical spectrum obtained with the Southern African Large Telescope, we classify this star as B1 Ia. The evolved status of MN18 is supported by the detection of nitrogen overabundance in the nebula, which implies that it is composed of processed material ejected by the star. We analysed the spectrum of MN18 by using the code CMFGEN, obtaining a stellar effective temperature of \approx 21 kK. The star is highly reddened, E(B-V)\approx 2 mag. Adopting an absolute visual magnitude of M_V=-6.8\pm0.5 (typical of B1 supergiants), MN18 has a luminosity of log L/Lsun \approx 5.42\pm0.30, a mass-loss rate of \approx (2.8-4.5)\times10^{-7} Msun/yr, and resides at a distance of \approx 5.6^{+1.5} _{-1.2} kpc. We discuss the origin of the nebula around MN18 and compare it with similar nebulae produced by other blue supergiants in the Galaxy (Sher 25, HD 168625, [SBW2007] 1) and the Large Magellanic Cloud (Sk-69 202). The nitrogen abundances in these nebulae imply that blue supergiants can produce them from the main sequence stage up to the pre-supernova stage. We also present a K-band spectrum of the candidate luminous blue variable MN56 (encircled by a ring-like nebula) and report the discovery of an OB star at \approx 17 arcsec from MN18. The possible membership of MN18 and the OB star of the star cluster Lynga 3 is discussed., 21 pages, 14 figures, accepted for publication in MNRAS
- Published
- 2015
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