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21. Secondary velocity standards at NGP
ID:
ivo://CDS.VizieR/J/PASP/118/1656
Title:
Secondary velocity standards at NGP
Short Name:
J/PASP/118/1656
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present mean radial velocities for 143 stars in Selected Area 57 at the north Galactic pole that are suitable for use as secondary velocity standards. The stars were drawn from a magnitude-limited sample and are mostly fainter than 11th magnitude in V. They span a wide range of effective temperatures and surface gravities and thus provide a suitable source of targets for observed templates. The mean radial velocities are based on at least 10 observations spanning at least 8200 days, and are accurate typically to 0.2km/s, with no obvious signs of variable velocity or composite spectra.
22. Stars earlier than F2 in a NGP region
ID:
ivo://CDS.VizieR/III/14
Title:
Stars earlier than F2 in a NGP region
Short Name:
III/14
Date:
21 Oct 2021
Publisher:
CDS
Description:
An objective prism survey for stars of spectral type F2 and earlier in a North Galactic Pole region was made with the Hamburg 80-120cm Schmidt telescope (dispersion 590{AA}/mm at H{gamma}). The accurate positions of these stars were recovered from the finding charts for stars without BD identification (table II) by B. Skiff (Lowell Obs.) in 2009.
23. The SSRS2 Sample
ID:
ivo://CDS.VizieR/J/AJ/108/1987
Title:
The SSRS2 Sample
Short Name:
J/AJ/108/1987
Date:
21 Oct 2021
Publisher:
CDS
Description:
In this paper we continue our investigation on the isophotal nature, accuracy, and uniformity of the magnitude system adopted in the Southern Sky Redshift Survey extension (SSRS2). Extending our earlier work, we examine galaxies in the equatorial region, primarily in the declination range -17.5 deg <= Dec. <= 0 deg, over a large range of right ascension, covering the southern and northern Galactic caps. For this purpose, we have obtained CCD isophotal magnitudes in the B and R bands for 265 galaxies of different morphological types. Using this larger sample we confirm our earlier claim that the m(SSRS2) magnitudes are very nearly the magnitude measured within the isophote mu_B = 26 mag/arcsec^2, with a dispersion of about 0.30 mag. The relative zero-point offset between our m(SSRS2) magnitudes and CCD photometry is -0.02 mag from all data we have obtained. However, we detect a variation of the zero-point across different regions of the sky of +/- 0.10 mag for regions at large angular separations. We also estimate that the zero-point offset between the m(SSRS2) and Zwicky systems is relatively small (~0.10 mag), which should allow us to combine the data from the SSRS2 and the CfA2 Redshift Survey.
24. Vertical distribution of galactic disk stars
ID:
ivo://CDS.VizieR/J/A+A/398/141
Title:
Vertical distribution of galactic disk stars
Short Name:
J/A+A/398/141
Date:
21 Oct 2021
Publisher:
CDS
Description:
Nearly 400 Tycho-2 (Cat. <I/259>) stars have been observed in a 720 square degree field in the direction of the North Galactic Pole with the high resolution echelle spectrograph ELODIE. Absolute magnitudes, effective temperatures, gravities and metallicities have been estimated, as well as distances and 3D velocities. Most of these stars are clump giants and span typical distances from 200pc to 800pc to the galactic mid-plane. This new sample, free of any kinematical and metallicity bias, is used to investigate the vertical distribution of disk stars.
25. Vilnius photometry in North Ecliptic Pole
ID:
ivo://CDS.VizieR/J/A+A/544/A49
Title:
Vilnius photometry in North Ecliptic Pole
Short Name:
J/A+A/544/A49
Date:
21 Oct 2021
Publisher:
CDS
Description:
Table 2 contains the results of photometry of 948 stars down to V=16.2mag in the Vilnius seven-color system at the North Ecliptic Pole. Photometric data are used to classify about 500 stars in spectral and luminosity classes. For the remaining stars one-dimensional spectral classes are given. The results of photometry and classification can be used to supplement the catalog of Gaia standard stars near the Ecliptic poles. To facilitate this, Table 3 presents the magnitudes of the SDSS and Gaia systems transformed from the Vilnius seven-color photometry.
26. Vilnius photometry of stars near NGP
ID:
ivo://CDS.VizieR/J/BaltA/8/443
Title:
Vilnius photometry of stars near NGP
Short Name:
J/BaltA/8/443
Date:
21 Oct 2021
Publisher:
CDS
Description:
Photoelectric seven-color photometry in the Vilnius medium-band system has been obtained for 374 stars in four MEGA proper-motion fields, KA 112, KA 113, KA 118 and KA 119, each of about 1.4 square degree size, near the North Galactic Pole. The catalog of observations is complete down to nearly V=13.0mag, except for the one field, KA 118, for which the completeness is achieved down to only V=12.5mag. For a description of the Vilnius photometric system, see e.g. <GCPD/21>
27. X-ray sources in the AKARI NEP deep field
ID:
ivo://CDS.VizieR/J/MNRAS/446/911
Title:
X-ray sources in the AKARI NEP deep field
Short Name:
J/MNRAS/446/911
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present data products from the 300ks Chandra survey in the AKARI North Ecliptic Pole (NEP) deep field. This field has a unique set of 9-band infrared photometry covering 2-24 micron from the AKARI Infrared Camera, including mid-infrared (MIR) bands not covered by Spitzer. The survey is one of the deepest ever achieved at ~15 micron, and is by far the widest among those with similar depths in the MIR. This makes this field unique for the MIR-selection of AGN at z~1. We design a source detection procedure, which performs joint Maximum Likelihood PSF fits on all of our 15 mosaicked Chandra pointings covering an area of 0.34 square degree. The procedure has been highly optimized and tested by simulations. We provide a point source catalog with photometry and Bayesian-based 90 per cent confidence upper limits in the 0.5-7, 0.5-2, 2-7, 2-4, and 4-7keV bands. The catalog contains 457 X-ray sources and the spurious fraction is estimated to be ~1.7 per cent. Sensitivity and 90 per cent confidence upper flux limits maps in all bands are provided as well. We search for optical MIR counterparts in the central 0.25 square degree, where deep Subaru Suprime-Cam multiband images exist. Among the 377 X-ray sources detected there, ~80 per cent have optical counterparts and ~60 per cent also have AKARI mid-IR counterparts. We cross-match our X-ray sources with MIR-selected AGN from Hanami et al. Around 30 per cent of all AGN that have MID-IR SEDs purely explainable by AGN activity are strong Compton-thick AGN candidates.

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