- ID:
- ivo://CDS.VizieR/J/ApJ/703/894
- Title:
- PNe in 5 nearby galaxies
- Short Name:
- J/ApJ/703/894
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- As the second step in our investigation of the mass-to-light ratio of spiral disks, we present the results of a spectroscopic survey of planetary nebulae (PNe) in five nearby, low-inclination galaxies: IC 342, M74 (NGC 628), M83 (NGC 5236), M94 (NGC 4736), and M101 (NGC 5457). Using 50 setups of the WIYN/Hydra and Blanco/Hydra spectrographs, and 25 observations with the Hobby-Eberly Telescope's Medium Resolution Spectrograph, we determine the radial velocities of 99, 102, 162, 127, and 48 PNe, respectively, to a precision better than 15km/s. Although the main purpose of this data set is to facilitate dynamical mass measurements throughout the inner and outer disks of large spiral galaxies, our spectroscopy has other uses as well. Here, we co-add these spectra to show that, to first order, the [OIII] and Balmer line ratios of PNe vary little over the top ~1.5mag of the PN luminosity function.
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162. PNe in NGC 5128
- ID:
- ivo://CDS.VizieR/J/ApJS/88/423
- Title:
- PNe in NGC 5128
- Short Name:
- J/ApJS/88/423
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a catalog of planetary nebulae in the nearest giant elliptical galaxy NGC 5128. The catalog consists of positions and [O III]{lambda}5007 magnitudes for 785 planetary nebulae. This is the second largest catalog of planetaries, next only to that of the Milky Way. We also list the coordinates of 32 bright stars from the Guide Star Catalog and 80 additional reference stars in the survey fields for astrometric reference during future observations. The positions of the planetary nebulae are accurate to 0.2" with respect to the Guide Star Catalog in right ascension or declination.
- ID:
- ivo://CDS.VizieR/J/ApJS/117/361
- Title:
- PNe in NRAO VLA Sky Survey
- Short Name:
- J/ApJS/117/361
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The 1.4GHz NRAO VLA Sky Survey (NVSS) images and source catalog were used to detect radio emission from the 885 planetary nebulae north of J2000 declination {delta}=-40{deg} in the Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Cat. <V/84>). We identified 680 radio sources brighter than about S=2.5mJy/beam (equivalent to T~0.8K in the 45" FWHM NVSS beam) with planetary nebulae by coincidence with accurate optical positions measured from Digitized Sky Survey (DSS) images. Total extinction coefficients c at {lambda}=4861{AA} were calculated for the 429 planetary nebulae with available H{beta} fluxes and low free-free optical depths at 1.4GHz. The variation of c with Galactic latitude and longitude is consistent with the extinction being primarily interstellar and not intrinsic.
164. PNe in six galaxies
- ID:
- ivo://CDS.VizieR/J/ApJ/577/31
- Title:
- PNe in six galaxies
- Short Name:
- J/ApJ/577/31
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the results of [O III] {lambda}5007 surveys for planetary nebulae (PNe) in six galaxies: NGC 2403, NGC 3115, NGC 3351, NGC 3627, NGC 4258, and NGC 5866. Using on-band/off-band [O III] {lambda}5007 images, as well as images taken in H{alpha}, we identify samples of PNe in these galaxies and derive their distances using the planetary nebula luminosity function (PNLF).
- ID:
- ivo://CDS.VizieR/J/ApJ/462/1
- Title:
- PNe in the Coma I region
- Short Name:
- J/ApJ/462/1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the result of an [OIII]500.7nm survey for planetary nebulae (PNe) in three galaxies of the Coma I group: NGC 4278 (Hubble type E1), NGC 4494 (E1), and NGC 4565 (edge-on Sb). Using the planetary nebula luminosity function (PNLF), we derived distances to NGC 4494 (12.8+/-0.9Mpc), NGC 4564 (10.5^+0.8^_-1.0_Mpc), and NGC 4278 (10.2^+0.7^_-1.0_Mpc). The larger distance for NGC 4494 is significant beyond the 99% confidence level when the common systematic errors in all three distances are removed. This agrees with the results of the globular cluster luminosity function and surface brightness fluctuation methods, both of which place NGC 4565 in front of NGC 4494. The large separation is also consistent with the results of Virgocentric flow models, which predict triple-valued solutions to the Hubble flow in that direction.
- ID:
- ivo://CDS.VizieR/J/ApJ/721/369
- Title:
- PNe in the elliptical galaxy NGC 821
- Short Name:
- J/ApJ/721/369
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using a slitless spectroscopy method with the 8.2m Subaru telescope and its FOCAS Cassegrain spectrograph, we have increased the number of planetary nebula (PN) detections and PN velocity measurements in the flattened elliptical galaxy NGC 821. A comparison with the detections reported previously by the Planetary Nebulae Spectrograph group indicates that we have confirmed most of their detections. The velocities measured by the two groups, using different telescopes, spectrographs, and slitless techniques, are in good agreement. We have built a combined sample of 167 PNs and have confirmed the Keplerian decline of the line-of-sight velocity dispersion reported previously. We also confirm misaligned rotation from the combined sample. A dark matter halo may exist around this galaxy, but it is not needed to keep the PN velocities below the local escape velocity as calculated from the visible mass. We have measured the m(5007) magnitudes of 145 PNs and produced a statistically complete sample of 40 PNs in NGC 821. The resulting PN luminosity function (PNLF) was used to estimate a distance modulus of 31.4mag, equivalent to 19Mpc.
- ID:
- ivo://CDS.VizieR/J/ApJ/736/65
- Title:
- PNe in the Virgo elliptical galaxy NGC 4649
- Short Name:
- J/ApJ/736/65
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using a slitless spectroscopy method with (1) the 8.2m Subaru telescope and its FOCAS Cassegrain spectrograph and (2) the ESO Very Large Telescope unit 1 (Antu) and its FORS2 Cassegrain spectrograph, we have detected 326 planetary nebulae (PNs) in the giant Virgo elliptical galaxy NGC 4649 (M60) and measured their radial velocities. After rejecting some PNs more likely to belong to the companion galaxy NGC 4647, we have built a catalog with kinematic information for 298 PNs in M60. Using these radial velocities, we have concluded that they support the presence of a dark matter halo around M60. Based on an isotropic, two-component Hernquist model, we estimate the dark matter halo mass within 3R_e_ to be 4x10^11^M_{sun}_, which is almost one-half of the total mass of about 10^12^M_{sun}_ within 3R_e_. This total mass is similar to that estimated from globular cluster, XMM-Newton, and Chandra observations. The dark matter becomes dominant outside. More detailed dynamical modeling of the PN data is being published in a companion paper. We have also measured the m(5007) magnitudes of many of these PNs and built a statistically complete sample of 218 PNs. The resulting PN luminosity function (PNLF) was used to estimate a distance modulus of 30.7+/-0.2mag, equivalent to 14+/-1Mpc. This confirms an earlier PNLF distance measurement based on a much smaller sample. The PNLF distance modulus remains smaller than the surface brightness fluctuation distance modulus by 0.4mag.
- ID:
- ivo://CDS.VizieR/J/ApJS/124/195
- Title:
- PN medium-resolution spectra
- Short Name:
- J/ApJS/124/195
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present medium-resolution (R~700) near-infrared (lambda=1-2.5m) spectra of a sample of planetary nebulae (PNe). A narrow slit was used which sampled discrete locations within the nebulae; observations were obtained at one or more positions in the 41 objects included in the survey. The PN spectra fall into one of four general categories: HI emission line-dominated PNe, HI and H_2_ emission line PNe, H_2_ emission line-dominated PNe, and continuum-dominated PNe. These categories correlate with morphological type, with the elliptical PNe falling into the first group, and the bipolar PNe primarily in the H_2_ and continuum emission groups. The categories also correlate with C/O ratio, with the O-rich objects generally falling into the first group and the C-rich objects in the other groups. Other spectral features were observed in all categories, such as continuum emission from the central star, C_2_, CN, and CO emission, and warm dust continuum emission toward the long wavelength end of the spectra. Molecular hydrogen was detected for the first time in four PNe. An excitation analysis was performed using the H_2_ line ratios for all of the PN spectra in the survey where a sufficient number of lines were observed.
- ID:
- ivo://CDS.VizieR/J/MNRAS/414/860
- Title:
- PN towards Galactic bulge. [OIII] fluxes
- Short Name:
- J/MNRAS/414/860
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present [OIII]{lambda}5007 fluxes and angular diametres for 435 Planetary Nebulae (PNe) in the central 10{deg}x10{deg} region towards the Galactic bulge. Our sample is taken from the new discoveries of the MASH PN surveys as well as previously known PN. This sample accounts for 80 per cent of known PN in this region. Fluxes and diametres are measured from narrow-band imaging with the MOSAIC-II camera on the 4-m Blanco Telescope at the Cerro-Tololo Inter-American Observatory. This is the largest (~60deg^2^), uniform [OIII]{lambda}5007 survey of the inner Galactic bulge ever undertaken. 104 of the objects have measured [OIII]{lambda}5007, [OIII]{lambda}4959, H{alpha} or H{beta} fluxes from the literature, which we use to undertake a detailed comparison to demonstrate the integrity of our new fluxes. Our independent measurements are in excellent agreement with the very best literature sources over two orders of magnitude, while maintaining good consistency over five orders of magnitude. The excellent resolution and sensitivity of our data allows not only for a robust set of homogenous PN fluxes, but provides greater detail into their intricate, otherwise undetermined [OIII]{lambda}5007 morphologies. These new, extensive measurements significantly increase the sample of reliable [OIII]{lambda}5007 fluxes for Galactic bulge PN making it a valuable resource and a prelude to the construction of our new Galactic bulge PN luminosity function (Paper II, Kovacevic et al., in prep.).
- ID:
- ivo://CDS.VizieR/J/A+AS/76/317
- Title:
- Possible new planetary nebulae in IRAS PSC
- Short Name:
- J/A+AS/76/317
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A method for searching new possible planetary nebulae among the unidentified sources of the IRAS Point Source Catalog is described. Sources were selected according to their far infrared colours, proximity to galactic equator, and quality of the IRAS detection. A catalog of 388 new possible planetary nebulae is presented and the properties of the selected sample are discussed.
