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2881. Planck-ATCA Co-eval Observations project
ID:
ivo://CDS.VizieR/J/MNRAS/455/3249
Title:
Planck-ATCA Co-eval Observations project
Short Name:
J/MNRAS/455/3249
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Planck-ATCA Co-eval Observations (PACO) project has yielded observations of 464 sources with the Australia Telescope Compact Array (ATCA) between 4.5 and 40GHz. The main purpose of the project was to investigate the spectral properties of mm-selected radio sources at frequencies below and overlapping with the ESA's Planck satellite frequency bands, minimizing the variability effects by observing almost simultaneously with the first two Planck all-sky surveys. In this paper we present the whole catalogue of observations in total intensity. By comparing PACO with the various measures of Planck Catalog of Compact Sources (PCCS) flux densities we found the best consistency with the PCCS 'detection pipeline' photometry (DETFLUX) that we used to investigate the spectral properties of sources from 5 to 217GHz. Of our sources, 91 percent have remarkably smooth spectrum, well described by a double power-law over the full range. This suggests a single emitting region, at variance with the notion that `flat' spectra result from the superposition of the emissions from different compact regions, self-absorbed up to different frequencies. Most of the objects show a spectral steepening above =~30GHz, consistent with synchrotron emission becoming optically thin. Thus, the classical dichotomy between flat-spectrum/compact and steep-spectrum/extended radio sources, well established at cm wavelengths, breaks down at mm wavelengths. The mm-wave spectra do not show indications of the spectral break expected as the effect of `electron ageing', suggesting young source ages.
2882. Planck high-z source candidates catalog (PHZ)
ID:
ivo://CDS.VizieR/J/A+A/596/A100
Title:
Planck high-z source candidates catalog (PHZ)
Short Name:
J/A+A/596/A100
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Planck mission, thanks to its large frequency range and all-sky coverage, has a unique potential for systematically detecting the brightest, and rarest, submillimetre sources on the sky, including distant objects in the high-redshift Universe traced by their dust emission. A novel method, based on a component-separation procedure using a combination of Planck and IRAS data, has been validated and characterized on numerous simulations, and applied to select the most luminous cold submillimetre sources with spectral energy distributions peaking between 353 and 857GHz at 5' resolution. A total of 2151 Planck high-z source candidates (the PHZ) have been detected in the cleanest 26% of the sky, with flux density at 545GHz above 500mJy. Embedded in the cosmic infrared background close to the confusion limit, these high-z candidates exhibit colder colours than their surroundings, consistent with redshifts z>2, assuming a dust temperature of Txgal=35K and a spectral index of {beta}xgal=1.5. Exhibiting extremely high luminosities, larger than 10^14^L_{sun}_, the PHZ objects may be made of multiple galaxies or clumps at high redshift, as suggested by a first statistical analysis based on a comparison with number count models. Furthermore, first follow-up observations obtained from optical to submillimetre wavelengths, which can be found in companion papers, have confirmed that this list consists of two distinct populations. A small fraction (around 3%) of the sources have been identified as strongly gravitationally lensed star-forming galaxies at redshift 2 to 4, while the vast majority of the PHZ sources appear as overdensities of dusty star-forming galaxies, having colours consistent with being at z>2, and may be considered as proto-cluster candidates. The PHZ provides an original sample, which is complementary to the Planck Sunyaev-Zeldovich Catalogue (PSZ2); by extending the population of virialized massive galaxy clusters detected below z<1.5 through their SZ signal to a population of sources at z>1.5, the PHZ may contain the progenitors of today's clusters. Hence the Planck list of high-redshift source candidates opens a new window on the study of the early stages of structure formation, particularly understanding the intensively star-forming phase at high-z.
2883. Planck Multi-frequency Cat. of Non-thermal Sources
ID:
ivo://CDS.VizieR/J/A+A/619/A94
Title:
Planck Multi-frequency Cat. of Non-thermal Sources
Short Name:
J/A+A/619/A94
Date:
21 Oct 2021
Publisher:
CDS
Description:
This paper presents the Planck Multi-frequency Catalogue of Non-thermal (i.e. synchrotron-dominated) Sources (PCNT) observed between 30 and 857GHz by the ESA Planck mission. This catalogue was constructed by selecting objects detected in the full mission all-sky temperature maps at 30 and 143GHz, with a signal-to-noise ratio S/N>3 in at least one of the two channels after filtering with a particular Mexican hat wavelet. As a result, 29400 source candidates were selected. Then, a multi-frequency analysis was performed using the Matrix Filters methodology at the position of these objects, and flux densities and errors were calculated for all of them in the nine Planck channels. This catalogue was built using a different methodology than the one adopted for the Planck Catalogue of Compact Sources (PCCS) and the Second Planck Catalogue of Compact Sources (PCCS2), although the initial detection was done with the same pipeline that was used to produce them. The present catalogue is the first unbiased, full-sky catalogue of synchrotron-dominated sources published at millimetre and submillimetre wavelengths and constitutes a powerful database for statistical studies of non-thermal extragalactic sources, whose emission is dominated by the central active galactic nucleus. Together with the full multi-frequency catalogue, we also define the Bright Planck Multi-frequency Catalogue of Non-thermal Sources (PCNTb), where only those objects with a S/N>4 at both 30 and 143GHz were selected. In this catalogue 1146 compact sources are detected outside the adopted Planck GAL070 mask; thus, these sources constitute a highly reliable sample of extragalactic radio sources. We also flag the high-significance subsample (PCNThs), a subset of 151 sources that are detected with S/N>4 in all nine Planck channels, 75 of which are found outside the Planck mask adopted here. The remaining 76 sources inside the Galactic mask are very likely Galactic objects
2884. Planck submillimetre sources in Virgo Cluster
ID:
ivo://CDS.VizieR/J/A+A/562/A106
Title:
Planck submillimetre sources in Virgo Cluster
Short Name:
J/A+A/562/A106
Date:
21 Oct 2021
Publisher:
CDS
Description:
We cross-correlate the Planck Catalogue of Compact Sources (PCCS) with the fully sampled 84deg^2^ Herschel Virgo Cluster Survey (HeViCS) fields. We search for and identify the 857 and 545GHz PCCS sources in the HeViCS fields by studying their FIR/submm and optical counterparts. We find 84 and 48 compact Planck sources in the HeViCS fields at 857 and 545GHz, respectively. Almost all sources correspond to individual bright Virgo Cluster galaxies. The vast majority of the Planck detected galaxies are late-type spirals, with the Sc class dominating the numbers, while early-type galaxies are virtually absent from the sample, especially at 545GHz. We compare the HeViCS SPIRE flux densities for the detected galaxies with the four different PCCS flux density estimators and find an excellent correlation with the aperture photometry flux densities, even at the highest flux density levels. We find only seven PCCS sources in the HeViCS fields without a nearby galaxy as obvious counterpart, and conclude that all of these are dominated by Galactic cirrus features or are spurious detections. No Planck sources in the HeViCS fields seem to be associated to high-redshift proto-clusters of dusty galaxies or strongly lensed submm sources. Finally, our study is the first empirical confirmation of the simulation-based estimated completeness of the PCCS, and provides a strong support of the internal PCCS validation procedure.
2885. Planetary nebula candidates in 3 galaxies
ID:
ivo://CDS.VizieR/J/ApJ/657/76
Title:
Planetary nebula candidates in 3 galaxies
Short Name:
J/ApJ/657/76
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the results of an [OIII] {lambda}5007 survey for PNe in five galaxies that were hosts of well-observed SNe Ia: NGC 524, NGC 1316, NGC 1380, NGC 1448, and NGC 4526. The goals of this survey are to better quantify the zero point of the maximum magnitude-decline rate relation for SNe Ia and to validate the insensitivity of Type Ia luminosity to parent stellar population using the host galaxy Hubble type as a surrogate. We detected a total of 45 PN candidates in NGC 1316, 44 candidates in NGC 1380, and 94 candidates in NGC 4526.
2886. Planetary nebulae as standard candles. II.
ID:
ivo://CDS.VizieR/J/ApJ/339/53
Title:
Planetary nebulae as standard candles. II.
Short Name:
J/ApJ/339/53
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of a planetary nebula survey of M31's bulge performed with the Kitt Peak No. 1, 0.9m telescope and on-band off-band {lambda}5007 filters. We detected a total of 429 planetary nebulae (PNs), of which 104 are members of a statistically complete and homogeneous sample covering the top 2.5mag of the planetary nebula luminosity function (PNLF).
2887. Planetary nebulae as standard candles. III.
ID:
ivo://CDS.VizieR/J/ApJ/344/704
Title:
Planetary nebulae as standard candles. III.
Short Name:
J/ApJ/344/704
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of a survey for planetary nebulae in the nearby Sb galaxy M81 (NGC 3031). Using the Kitt Peak 4m telescope and a TI CCD, we identify 185 planetary nebula candidates. Photometry of the nebulae extends nearly 2.5mag below the brightest candidate, although the sample is statistically homogeneous and complete for only 88 nebulae representing the top 1.2mag of the luminosity function.
2888. Planetary nebulae as standard candles. IV.
ID:
ivo://CDS.VizieR/J/ApJ/344/715
Title:
Planetary nebulae as standard candles. IV.
Short Name:
J/ApJ/344/715
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of a planetary nebula survey of galaxies in the Leo I group performed with the Kitt Peak and Cerro Tololo 4m telescopes and on-band off-band {lambda}5007 interference filters. In all, we detected 249 PN candidates populating the top 1.5mag of the planetary nebula luminosity function (PNLF), including 93 in the E0 galaxy NGC 3379, 54 in the E6 galaxy NGC 3377, and 102 in the S0 spiral NGC 3384.
2889. Planetary nebulae as standard candles. IX.
ID:
ivo://CDS.VizieR/J/ApJ/416/62
Title:
Planetary nebulae as standard candles. IX.
Short Name:
J/ApJ/416/62
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of a planetary nebula (PN) survey of three galaxies in the Fornax Cluster performed with the Cerro Tololo 4m telescope and on-band off-band [O III] {lambda}5007 interference filters. In all, we detected 224 PN candidates : 105 in the peculiar SO/Sa galaxy NGC 1316 (Fornax A), 47 in the E2 galaxy NGC 1404, and 72 in the central cD of the cluster NGC 1399. Using statistically complete samples of planetaries and the procedures described in previous papers in the series, we derive distances to these galaxies from the planetary nebula luminosity function (PNLF).
2890. Planetary nebulae as standard candles. V.
ID:
ivo://CDS.VizieR/J/ApJ/356/332
Title:
Planetary nebulae as standard candles. V.
Short Name:
J/ApJ/356/332
Date:
21 Oct 2021
Publisher:
CDS
Description:
We identify and measure the [O III] {lambda}5007 fluxes of 486 planetary nebula candidates in six early-type galaxies (NGC 4374, 4382, 4406, 4472, 4486, and 4649) in the core of the Virgo Cluster. Following the procedures and calibrations outlined in previous papers in this series, we compare the observed planetary nebula luminosity functions to an empirical model based on the planetary nebulae in M31 and derive distances to the galaxies of 15.7, 14.4, 15.7, 13.9, 14.5, and 14.2Mpc.

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