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3451. C stars in Pegasus, DDO 210 and Tucana
ID:
ivo://CDS.VizieR/J/AJ/120/1801
Title:
C stars in Pegasus, DDO 210 and Tucana
Short Name:
J/AJ/120/1801
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the latest results of our ongoing four-filter photometric survey of C stars in Local Group dwarf irregular galaxies. Observations of the two low-luminosity dwarf irregular galaxies, Pegasus and DDO 210, revealed 40 and three C stars, respectively, assuming that the reddening of Pegasus is negligible. No C stars were identified in Tucana. Our observations permit the estimation of the color-magnitude diagram contamination by foreground M dwarfs thus yielding reliable C/M ratios. Our R and I photometry of the C stars cannot be used to solve the extinction controversy toward Pegasus. The three C stars in DDO 210 are quite bright when compared with C star populations in other dwarf galaxies. A larger, fainter population in that galaxy seems improbable, however. The statistics of C stars currently on hand for dwarf galaxies show a well-defined trend with the absolute magnitude of dwarf galaxies.
3452. C stars in SMC
ID:
ivo://CDS.VizieR/J/A+AS/97/603
Title:
C stars in SMC
Short Name:
J/A+AS/97/603
Date:
21 Oct 2021
Publisher:
CDS
Description:
Accurate positions and charts for 1707 carbon stars in the Small Magellanic Cloud identified on GRISM plates are presented. The catalog provides data on magnitudes, colors, and carbon-abundance measurements and can be used for selecting carbon stars with special characteristics.
3453. C stars in Wolf-Lundmark-Melotte galaxy
ID:
ivo://CDS.VizieR/J/A+A/416/111
Title:
C stars in Wolf-Lundmark-Melotte galaxy
Short Name:
J/A+A/416/111
Date:
21 Oct 2021
Publisher:
CDS
Description:
We used the CFH12K wide field camera to survey the carbon star population of the Wolf-Lundmark-Melotte system using the CN-TiO technique. 149 C stars are identified with a mean <I>=20.28, corresponding to <M_I_>=-4.65, a mean luminosity similar to what we found in other irregular galaxies. Star counts in and around the main body of WLM reveal that its stellar distribution is quite elliptical ({epsilon}=0.58) with major and minor axes of 26' and 11'. Comparison of the density profile of C stars and old red giants shows that their scale lengths differ by only 15% pointing to mixed populations. Wolf-Lundmark-Melotte is found to be unique among dwarf irregular galaxies by having essentially a handful of early-type AGB M stars thus leading to an extreme C/M ratio.
3454. 9C survey at 15GHz
ID:
ivo://CDS.VizieR/J/MNRAS/342/915
Title:
9C survey at 15GHz
Short Name:
J/MNRAS/342/915
Date:
21 Oct 2021
Publisher:
CDS
Description:
The fields chosen for the first observations of the cosmic microwave background with the Very Small Array have been surveyed with the Ryle Telescope at 15GHz. We have covered three regions around RA=00h20m DE=+30{deg}, RA=09h40m DE=+32{deg} and RA=15h40m DE=+43{deg} (J2000.0), an area of 520{deg}^2^. There are 242 sources above the estimated completeness limit of ~25mJy, although a total of ~760 sources have been detected, some as faint as 10mJy.
3455. 10C Survey at 15.7 GHz Radio Source Catalog
ID:
ivo://nasa.heasarc/ami10c15gz
Title:
10C Survey at 15.7 GHz Radio Source Catalog
Short Name:
AMI10C15GZ
Date:
09 May 2025
Publisher:
NASA/GSFC HEASARC
Description:
In a previous paper (AMI Consortium 2011, MNRAS, 415, 2699: Paper I), the observational, mapping and source-extraction techniques used for the Tenth Cambridge (10C) Survey of Radio Sources were described. Here, the first results from the survey, carried out using the Arcminute Microkelvin Imager (AMI) Large Array (LA) at an observing frequency of 15.7 GHz, are presented. The survey fields cover an area of ~ 27 deg&lt;sup&gt;2&lt;/sup&gt; to a flux-density completeness of 1 mJy. Results for some deeper areas, covering ~ 12 deg&lt;sup&gt;2&lt;/sup&gt;, which are wholly contained within the total areas and complete to 0.5 mJy, are also presented. The completeness for both areas is estimated to be at least 93 per cent. The 10C survey is the deepest radio survey of any significant extent (&gt;~ 0.2 deg&lt;sup&gt;2&lt;/sup&gt;) above 1.4 GHz. The 10C source catalogue contains 1897 entries detected above a flux density threshold of &gt; 4.62 sigma, and is available here and at the authors&#39; web site &lt;a href="http://www.mrao.cam.ac.uk/surveys/10C"&gt;http://www.mrao.cam.ac.uk/surveys/10C&lt;/a&gt;. The source catalog has been combined with that of the Ninth Cambridge Survey to calculate the 15.7-GHz source counts. A broken power law is found to provide a good parametrization of the differential count between 0.5 mJy and 1 Jy. The measured source count has been compared with that predicted by de Zotti et al. (2005, A&amp;A, 431, 893, and the model is found to display good agreement with the data at the highest flux densities. However, over the entire flux-density range of the measured count (0.5 mJy to 1 Jy), the model is found to underpredict the integrated count by ~ 30 per cent. Entries from the source catalog have been matched with those contained in the catalogues of the NRAO VLA Sky Survey and the Faint Images of the Radio Sky at Twenty-cm survey (both of which have observing frequencies of 1.4 GHz). This matching provides evidence for a shift in the typical 1.4-GHz spectral index to 15.7-GHz spectral index of the 15.7-GHz-selected source population with decreasing flux density towards sub-mJy levels - the spectra tend to become less steep. Automated methods for detecting extended sources, developed in Paper I, have been applied to the data; ~ 5 per cent of the sources are found to be extended relative to the LA-synthesized beam of ~ 30 arcsec. Investigations using higher resolution data showed that most of the genuinely extended sources at 15.7 GHz are classical doubles, although some nearby galaxies and twin-jet sources were also identified. This table was created by the HEASARC in August 2011 based on an electronic version of Table 1 of the reference paper which was obtained from the 10C Survey web site &lt;a href="http://www.mrao.cam.ac.uk/surveys/10C/"&gt;http://www.mrao.cam.ac.uk/surveys/10C/&lt;/a&gt;. This is a service provided by NASA HEASARC .
3456. 5C12: survey near the North Galactic Pole
ID:
ivo://CDS.VizieR/J/MNRAS/200/747
Title:
5C12: survey near the North Galactic Pole
Short Name:
J/MNRAS/200/747
Date:
21 Oct 2021
Publisher:
CDS
Description:
This catalog contains a deep survey (5C12) of a region close to the North Galactic Pole carried out with the Cambridge One-Mile Telescope at 408 MHz (HPBW 80"x139") and at 1407 MHz (HPBW 23"x40"). The flux densities are on the KPW scale (Kellermann et al. 1969ApJ...157....1K), and were based on 3C48, 3C147 and 3C295. This part of the survey contains 321 sources with apparent flux densities brighter than 9 mJy at 408 MHz or 1.4 mJy at 1407 MHz.
3457. 7C: survey of radio sources
ID:
ivo://CDS.VizieR/J/A+AS/110/419
Title:
7C: survey of radio sources
Short Name:
J/A+AS/110/419
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Cambridge Low Frequency Synthesis Telescope has been used at 151MHz to survey a region of 418 square degrees centred at RA=17h, DE=65deg, which includes the North Ecliptic Cap. The resolution is 70x70"cosec{delta} and the rms noise on the maps is 25mJy/beam. We present positions and flux densities for 2702 sources which have a signal to noise ratio >5.5 and radio maps of 37 selected extended sources.
3458. 10C survey of radio sources at 15.7GHz
ID:
ivo://CDS.VizieR/J/MNRAS/415/2708
Title:
10C survey of radio sources at 15.7GHz
Short Name:
J/MNRAS/415/2708
Date:
21 Oct 2021
Publisher:
CDS
Description:
In a previous paper (Paper I, Franzen et al., 2011MNRAS.415.2699F), the observational, mapping and source-extraction techniques used for the Tenth Cambridge (10C) Survey of Radio Sources were described. Here, the first results from the survey, carried out using the Arcminute Microkelvin Imager Large Array (LA) at an observing frequency of 15.7GHz, are presented. The survey fields cover an area of ~27deg^2^ to a flux-density completeness of 1mJy. Results for some deeper areas, covering ~12deg^2^, wholly contained within the total areas and complete to 0.5mJy, are also presented. The completeness for both areas is estimated to be at least 93 per cent. The 10C survey is the deepest radio survey of any significant extent (>~0.2deg^2^) above 1.4GHz.
3459. 7C survey of radio sources at 151 MHz
ID:
ivo://CDS.VizieR/J/MNRAS/246/110
Title:
7C survey of radio sources at 151 MHz
Short Name:
J/MNRAS/246/110
Date:
21 Oct 2021
Publisher:
CDS
Description:
The 7C survey of radio sources is being made with the Cambridge Low-Frequency Synthesis Telescope at 151MHz, with an angular resolution of 70x70cosec{delta}.arcsec^2^. We present the results from one part of of this survey covering 0.144sr in two areas of sky centred at RA=10h28min, DE=41{deg} and RA=06h28min, DE=45{deg} and reaching a limiting flux density of 50mJy. A list of the positions, flux densities and angular sizes of 4723 sources is presented; the position errors are in the range 1-3arcsec for sources with flux densities greater than 500mJy, and the flux density errors are typically 18mJy. About 10 per cent of the sources have apparent angular sizes greater than 60arcsec. The derived source counts are as accurate as those presently available at 405 and 1400MHz and show similar behaviour; in particular the convergence slopes are the same. The median spectral index between 151 and 408MHz remains constant at ~0.9 between 10 and 0.5Jy at 151MHz.
3460. 6C Survey of radio sources I.
ID:
ivo://CDS.VizieR/VIII/18
Title:
6C Survey of radio sources I.
Short Name:
VIII/18
Date:
21 Oct 2021
Publisher:
CDS
Description:
The 6th Cambridge Survey of radio sources covers most of the sky north of Dec>30{deg} with an angular resolution of 4.2x4.2cosec{delta} arcmin^2^ and a limiting flux density of 120mJy at 151MHz. This paper, the first of a series, describes the telescope and the methods used to produce the survey maps and source list, and presents maps of a circular area of radius 10{deg} centered on the North Celestial Pole and a list of 1761 sources north of {delta}>+80{deg}.

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