scholarly journals Analysis of Multiple Shell Planetary Nebulae Based on HST/WFPC2 Extended 2D Diagnostic Diagrams

Galaxies ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 84 ◽  
Author(s):  
Daniela Barría ◽  
Stefan Kimeswenger
Keyword(s):  
Ionizing Radiation ◽  
Electron Temperature ◽  
Thermodynamic Parameters ◽  
Narrow Band ◽  
Hubble Space Telescope ◽  
Planetary Nebulae ◽  
Wide Field ◽  
Spatially Resolved ◽  
Gaseous Nebulae ◽  
Hα Emission

The investigation of gaseous nebulae, emitting in forbidden lines, is often based extensively on diagnostic diagrams. The special physics of these lines often allows for disentangling with a few line ratios normally coupled thermodynamic parameters like electron temperature, density and properties of the photo-ionizing radiation field. Diagnostic diagrams are usually used for the investigation of planetary nebulae as a total. We investigated the extension of such integrated properties towards spatially resolved 2D diagnostics, using Hubble Space Telescope/Wide Field Planetary Camera 2 (HST/WFPC2) narrow band images. For this purpose, we also derived a method to isolate pure Hα emission from the [N ii] contamination as normally suffering in the F656N HST/WFPC2 filter.

scholarly journals Orientation of galactic bulge planetary nebulae toward the Galactic center

2014 ◽  
Vol 10 (S312) ◽  
pp. 128-130
Author(s):  
Ashkbiz Danehkar ◽  
Quentin A. Parker
Keyword(s):  
Emission Line ◽  
Galactic Center ◽  
Planetary Nebulae ◽  
Wide Field ◽  
Spatially Resolved ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
National University ◽  
Hα Emission ◽  
Integral Field

AbstractWe have used the Wide Field Spectrograph on the Australian National University 2.3-m telescope to perform the integral field spectroscopy for a sample of the Galactic planetary nebulae. The spatially resolved velocity distributions of the Hα emission line were used to determine the kinematic features and nebular orientations. Our findings show that some bulge planetary nebulae toward the Galactic center have a particular orientation.

scholarly journals Electron Temperature and Density Mapping in Planetary Nebulae

1978 ◽  
Vol 76 ◽  
pp. 163-164
Author(s):  
N.K. Reay ◽  
S.P. Worswick
Keyword(s):  
Electron Temperature ◽  
Relative Intensity ◽  
Linear Response ◽  
Narrow Band ◽  
Planetary Nebulae ◽  
Emission Lines ◽  
Simple Method ◽  
Density Mapping ◽  
Intensity Ratios

The linear response of the electronographic process provides a simple method for producing relative intensity ratios of emission lines across a complete nebula. Using narrow-band filters to isolate those lines which are sensitive to electron temperature and density changes, it is possible to map the gross variation of these quantities across the object.

scholarly journals First Results from a Panchromatic HST/WFC3 Imaging Study of the Young, Rapidly Evolving Planetary Nebulae NGC 7027 and NGC 6302

Galaxies ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 49
Author(s):  
Joel H. Kastner ◽  
Jesse Bublitz ◽  
Bruce Balick ◽  
Rodolfo Montez ◽  
Adam Frank ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Imaging Study ◽  
Planetary Nebulae ◽  
Wide Field ◽  
Space Telescope ◽  
Near Ir ◽  
Ngc 7027 ◽  
First Results ◽  
Initial Color ◽  
Line Imaging

We present the first results from comprehensive, near-UV-to-near-IR Hubble Space Telescope Wide Field Camera 3 (WFC3) emission-line imaging studies of two young planetary nebulae (PNe), NGC 7027 and NGC 6302. These two objects represent key sources for purposes of understanding PNe shaping processes. Both nebulae feature axisymmetric and point-symmetric (bipolar) structures and, despite hot central stars and high nebular excitation states, both harbor large masses of molecular gas and dust. The sweeping wavelength coverage of our Cycle 27 Hubble Space Telescope (HST)/WFC3 imaging surveys targeting these two rapidly evolving PNe will provide a battery of essential tests for theories describing the structural and chemical evolution of evolved star ejecta. Here, we present initial color overlays for selected images, and we highlight some of the first results gleaned from the surveys.

scholarly journals HST/WFC3 Grism Observations of z ∼ 1 Clusters: Evidence for Rapid Outside-in Environmental Quenching from Spatially Resolved Hα Maps

2021 ◽  
Vol 923 (2) ◽  
pp. 222
Author(s):  
Jasleen Matharu ◽  
Adam Muzzin ◽  
Gabriel B. Brammer ◽  
Erica J. Nelson ◽  
Matthew W. Auger ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Stellar Mass ◽  
Wide Field ◽  
Cluster Galaxy ◽  
Cluster Galaxies ◽  
Star Forming ◽  
Spatially Resolved ◽  
Field Environment ◽  
Ram Pressure ◽  
Quenching Process

Abstract We present and publicly release (www.gclasshst.com) the first spatially resolved Hα maps of star-forming cluster galaxies at z ∼ 1, made possible with the Wide Field Camera 3 (WFC3) G141 grism on the Hubble Space Telescope (HST). Using a similar but updated method to 3D-HST in the field environment, we stack the Hα maps in bins of stellar mass, measure the half-light radius of the Hα distribution, and compare it to the stellar continuum. The ratio of the Hα to stellar continuum half-light radius, R [ H α / C ] = R eff , H α R eff , Cont , is smaller in the clusters by (6 ± 9)%, but statistically consistent within 1σ uncertainties. A negligible difference in R[Hα/C] with environment is surprising, given the higher quenched fractions in the clusters relative to the field. We postulate that the combination of high quenched fractions and no change in R[Hα/C] with environment can be reconciled if environmental quenching proceeds rapidly. We investigate this hypothesis by performing similar analysis on the spectroscopically confirmed, recently quenched cluster galaxies. 87% have Hα detections, with star formation rates 8 ± 1 times lower than star-forming cluster galaxies of similar stellar mass. Importantly, these galaxies have an R[Hα/C] that is (81 ± 8)% smaller than coeval star-forming field galaxies at fixed stellar mass. This suggests the environmental quenching process occurred outside-in. We conclude that disk truncation due to ram pressure stripping is occurring in cluster galaxies at z ∼ 1, but more rapidly and/or efficiently than in z ≲ 0.5 clusters, such that the effects on R[Hα/C] become observable just after the cluster galaxy has recently quenched.

scholarly journals Searching for planetary nebulae at the Galactic halo via J-PAS

2015 ◽  
Vol 11 (S317) ◽  
pp. 304-305
Author(s):  
Denise R. Gonçalves ◽  
T. Aparício-Villegas ◽  
S. Akras ◽  
A. Cortesi ◽  
M. Borges-Fernandes ◽  
...  
Keyword(s):  
Galactic Halo ◽  
Narrow Band ◽  
Narrow Band Imaging ◽  
Broad Band ◽  
Planetary Nebulae ◽  
Accelerating Universe ◽  
Wide Field ◽  
The Galaxy ◽  
First Results ◽  
Chemical Conditions

AbstractThe Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS) is a narrow-band imaging, very wide field cosmological survey. It will last 5 years and will observe 8500 sq. deg. of the sky. There will be 54 contiguous narrow-band filters of 145Å FWHM, from 3,500 to 10,000Å. Two broad-band filters will be added at the extremes, UV and IR, plus the 3–g, r, and i– SDSS filters. Thus, J-PAS can be an important tool to search for new planetary nebulae (PNe) at the halo, increasing their numbers, because only 14 of them have been convincingly identified in the literature. Halo PNe are able to reveal precious information for the study of stellar evolution and the early chemical conditions of the Galaxy. The characteristic low continuum and intense emission lines of PNe make them good objects to be searched by J-PAS. Though covering a significantly smaller sky area, data from the ALHAMBRA survey were used to test our J-PAS strategy to search for PNe. Our first results are shown in this contribution.

scholarly journals Spectrophotometry of 14 southern planetary nebulae

1964 ◽  
Vol 20 ◽  
pp. 45-50 ◽  
Author(s):  
L. H. Aller ◽  
D. J. Faulkner
Keyword(s):  
Electron Temperature ◽  
Line Intensity ◽  
Planetary Nebulae ◽  
Balmer Series ◽  
Degree Of Ionization ◽  
Astrophysical Interest ◽  
Intensity Measurements ◽  
Gaseous Nebulae ◽  
Balmer Decrement

The theory of radiative and collisional processes in gaseous nebulae makes possible precise predictions of line and continuum intensities as functions of density, electron temperature, and degree of ionization of the emitting gases. It predicts, for example, the relative intensities of successive members of the Balmer series (Balmer decrement), and of corresponding transitions in the Balmer and Paschen series. Hence accurate line intensity measurements are not only of astrophysical interest; they also serve to assess the amount of space absorption.

scholarly journals CCD Imaging of Nearby Aged Planetary Nebulae

1994 ◽  
Vol 161 ◽  
pp. 484-486
Author(s):  
J. Papamastorakis ◽  
K.M. Xilouris ◽  
E.V. Paleologou
Keyword(s):  
Narrow Band ◽  
Planetary Nebulae ◽  
Central Star ◽  
Wide Field ◽  
Ccd Imaging ◽  
Evolutionary Scenario ◽  
Angular Extent ◽  
Red Giant ◽  
Set Up ◽  
Stellar Motion

We present results from narrow band CCD images in Hα + [N II] and [O III] of very faint, nearby (less than 0.5 kpc) planetary nebulae (PNe), of large angular extent. The instrumental set up used (Mount Skinakas Wide Field Camera) is capable of detecting structures of large angular extent as faint as 10−17 ergs sec−1 cm−2 arcsec−2. New faint structures are revealed mostly at large distances from the suspected central star of the PNe studied. These structures are atypical of the PNe population and hard to reconcile with the interacting stellar wind evolutionary scenario. They are rather reminiscent of the interaction of the former Red Giant Envelope with the ambient Interstellar Medium. The characteristics of this aged sample are asymmetric emission distribution, displacement of the central star, extremely low expansion velocities, concentrations along the stellar motion, with the [O III] emission amorphous and confined close to the center of the PN while the Hα + [N II] emission is structured and more extended.

scholarly journals Hα imaging for BeXRBs in the Small Magellanic Cloud

2016 ◽  
Vol 12 (S329) ◽  
pp. 373-375 ◽  
Author(s):  
G. Maravelias ◽  
A. Zezas ◽  
V. Antoniou ◽  
D. Hatzidimitriou ◽  
F. Haberl
Keyword(s):  
Narrow Band ◽  
Formation Rate ◽  
Broad Band ◽  
Magellanic Cloud ◽  
High Mass ◽  
Wide Field ◽  
Small Magellanic Cloud ◽  
X Ray ◽  
Hα Emission ◽  
X Ray Binaries

AbstractThe Small Magellanic Cloud (SMC) hosts a large number of high-mass X-ray binaries, and in particular of Be/X-ray Binaries (BeXRBs; neutron stars orbiting OBe-type stars), offering a unique laboratory to address the effect of metalicity. One key property of their optical companion is Hα in emission, which makes them bright sources when observed through a narrow-band Hα filter. We performed a survey of the SMC Bar and Wing regions using wide-field cameras (WFI@MPG/ESO and MOSAIC@CTIO/Blanco) in order to identify the counterparts of the sources detected in our XMM-Newton survey of the same area. We obtained broad-band R and narrow-band Hα photometry, and identified ~10000 Hα emission sources down to a sensitivity limit of 18.7 mag (equivalent to ~B8 type Main Sequence stars). We find the fraction of OBe/OB stars to be 13% down to this limit, and by investigating this fraction as a function of the brightness of the stars we deduce that Hα excess peaks at the O9-B2 spectral range. Using the most up-to-date numbers of SMC BeXRBs we find their fraction over their parent population to be ~0.002 − 0.025 BeXRBs/OBe, a direct measurement of their formation rate.

scholarly journals Testing the evolution of correlations between supermassive black holes and their host galaxies using eight strongly lensed quasars

2020 ◽  
Vol 501 (1) ◽  
pp. 269-280
Author(s):  
Xuheng Ding ◽  
Tommaso Treu ◽  
Simon Birrer ◽  
Adriano Agnello ◽  
Dominique Sluse ◽  
...  
Keyword(s):  
Black Holes ◽  
Hubble Space Telescope ◽  
High Redshift ◽  
Galactic Nuclei ◽  
Host Galaxy ◽  
Wide Field ◽  
Host Galaxies ◽  
Field Surveys ◽  
Instrumental Resolution ◽  
The Moment

ABSTRACT One of the main challenges in using high-redshift active galactic nuclei (AGNs) to study the correlations between the mass of a supermassive black hole ($\mathcal {M}_{\rm BH}$) and the properties of its active host galaxy is instrumental resolution. Strong lensing magnification effectively increases instrumental resolution and thus helps to address this challenge. In this work, we study eight strongly lensed AGNs with deep Hubble Space Telescope imaging, using the lens modelling code lenstronomy to reconstruct the image of the source. Using the reconstructed brightness of the host galaxy, we infer the host galaxy stellar mass based on stellar population models. $\mathcal {M}_{\rm BH}$ are estimated from broad emission lines using standard methods. Our results are in good agreement with recent work based on non-lensed AGNs, demonstrating the potential of using strongly lensed AGNs to extend the study of the correlations to higher redshifts. At the moment, the sample size of lensed AGNs is small and thus they provide mostly a consistency check on systematic errors related to resolution for non-lensed AGNs. However, the number of known lensed AGNs is expected to increase dramatically in the next few years, through dedicated searches in ground- and space-based wide-field surveys, and they may become a key diagnostic of black holes and galaxy co-evolution.

Narrow-band photometry of Wolf-Rayet stars and planetary nebulae

1990 ◽  
Vol 171 (1-2) ◽  
pp. 157-160
Author(s):  
Eugenio E. Mendoza V.
Keyword(s):  
Narrow Band ◽  
Planetary Nebulae
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