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281. 90cm observations of the deep SWIRE field
ID:
ivo://CDS.VizieR/J/AJ/137/4846
Title:
90cm observations of the deep SWIRE field
Short Name:
J/AJ/137/4846
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present one of the deepest radio continuum surveys to date at a wavelength >~1m. The observations were taken with the VLA at 324.5MHz covering a region of the SWIRE Spitzer Legacy survey, centered at 10:46:00, +59:01:00 (J2000). The data reduction and analysis are described and an electronic catalog of the sources detected above 5{sigma} is presented. We also discuss the observed angular size distribution for the sample. Using our deeper 20cm survey of the same field, we calculate spectral indices for sources detected in both surveys.
282. 18-cm OH lines in comets
ID:
ivo://CDS.VizieR/J/A+A/393/1053
Title:
18-cm OH lines in comets
Short Name:
J/A+A/393/1053
Date:
21 Oct 2021
Publisher:
CDS
Description:
Since the apparition of comet Kohoutek 1973 XII, the 18-cm lines of the OH radical have been systematically observed in a number of comets with the Nancay radio telescope. Between 1973 and 1999, 52 comets have been successfully detected. This allowed an evaluation of the cometary water production rates and their evolution with time, as well as a study of several physical processes such as the excitation mechanisms of the OH radio lines, the expansion of cometary atmospheres, their anisotropy in relation to non-gravitational forces, and the Zeeman effect in relation to the cometary magnetic field. Part of these observations and their analysis have already been published. The bulk of the results are now organized in a data base. The present paper is a general presentation of the Nancay cometary data base and a more specific description of the observations of 53 cometary apparitions between 1982 and 1999. Comets observed before 1982 are only partly incorporated in the data base. Observations of comets since 2000 have benefited from a major upgrade of the telescope; they will be presented in forthcoming publications.
283. 5cm OH masers survey
ID:
ivo://CDS.VizieR/J/A+A/325/255
Title:
5cm OH masers survey
Short Name:
J/A+A/325/255
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have undertaken a comprehensive search for 5 cm OH masers in regions visible from Effelsberg with the 100-m telescope (i.e., those with declinations above -29^o^). Our sample is based on bright sources taken from the IRAS Point Source Catalog and/or from previous 18cm OH and H_ 2_O surveys. Among the 165 sources observed, 16 are new (15 exhibit emission and one source shows both absorption and emission). Two new absorption line sources have been tentatively detected. The general properties of the 5cm OH sources are presented and discussed. The 6035MHz line is more often detected than the 6031MHz line. Nevertheless, the latter line is frequently present, a fact that is not explained by present OH excitation models. Simple calculations tend to show that there are enough FIR photons to pump the 6035 and 6031MHz masers, and we found that the statistics of the ratio S_ radio_/S_ IR_ at 18, 5 and 6cm suggest that the maser pumping efficiency decreases with increasing OH excitation. Variability on short (months) or long (years) time-scales is a common feature in many 5 cm OH sources. We also present observations of the 6 GHz satellite lines and report, besides W3(OH), on two certain and perhaps two newly detected weak sources. Some implications on the excitation of OH are briefly discussed.
284. 21cm radio continuum survey. I.
ID:
ivo://CDS.VizieR/J/A+AS/83/539
Title:
21cm radio continuum survey. I.
Short Name:
J/A+AS/83/539
Date:
21 Oct 2021
Publisher:
CDS
Description:
The 21 cm Galactic Plane survey was carried out with the Effelsberg 100-m radio telescope (HPBW = 9.4'). It contains sources from l=357{deg} to l=95.5{deg} and from -4{deg}<b<4{deg}. The data were absolutely calibrated by using the Stockert Northern Sky survey at the same wavelength. Included are 884 compact objects with peak flux densities greater than 98 mJy (or 200 mK Tb) and apparent sizes less than 16'. This survey is especially useful for studying extended emission complexes in the Galactic plane and complements the Effelsberg 11 cm survey of the Galactic plane (Reich et al., Cat. <J/A+AS/85/805>)
285. 21cm radio continuum survey. II.
ID:
ivo://CDS.VizieR/J/A+AS/126/413
Title:
21cm radio continuum survey. II.
Short Name:
J/A+AS/126/413
Date:
21 Oct 2021
Publisher:
CDS
Description:
We analysed the 21cm Galactic Plane survey carried out with the Effelsberg 100-m telescope for small diameter sources. We present a list of 1830 radio sources with a maximum apparent size of 16' and peak flux densities >160mK or >79mJy/beam area, and a list of 884 radio sources with a maximum apparent size of 16' and peak flux densities >200mK or >98mJy/beam area.
286. 11cm radio continuum survey. IV.
ID:
ivo://CDS.VizieR/J/A+AS/85/805
Title:
11cm radio continuum survey. IV.
Short Name:
J/A+AS/85/805
Date:
21 Oct 2021
Publisher:
CDS
Description:
We analysed the 11cm Galactic Plane survey carried out with the Effelsberg 100-m telescope for small diameter sources. We present a list of 6483 radio sources with a maximum apparent size of 12' and peak flux densities >40mJy/beam area. Point-like sources are almost evenly distributed over the surveyed area, except that we miss some sources in the highly confused inner part of the Galaxy and the Cygnus X complex. At Galactic longitudes l>100deg the list of compact sources is almost complete above an integrated flux density limit of 70mJy. Most of them are extragalactic. Extended sources show a concentration towards the Galactic Plane. At longitudes l<100deg the scale height is about 0.6deg. An excess of about 900 extended sources is most likely of Galactic structure.
287. 22-cm radio survey of A3528
ID:
ivo://CDS.VizieR/J/MNRAS/324/1131
Title:
22-cm radio survey of A3528
Short Name:
J/MNRAS/324/1131
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report and discuss the results of a 22-cm radio survey carried out with the Australia Telescope Compact Array (ATCA) covering the A3528 complex, a chain formed by the merging ACO clusters A3528-A3530-A3532, located in the central region of the Shapley Concentration. Simultaneous 13-cm observations are also presented. Our final catalogue includes a total of 106 radio sources above the flux density limit of 0.8mJy. By cross-correlation with optical and spectroscopic catalogues we found 32 optical counterparts, nine of them belonging to the A3528 complex.
288. 11cm survey, 357.4<=l<=76, -1.5<=b<=1.5
ID:
ivo://CDS.VizieR/J/A+AS/58/197
Title:
11cm survey, 357.4<=l<=76, -1.5<=b<=1.5
Short Name:
J/A+AS/58/197
Date:
21 Oct 2021
Publisher:
CDS
Description:
The 11 cm radio continuum radiation of the Galactic Plane is shown in the form of an atlas of contour maps covering the range l=357.4 to 76{deg}, |b|=1.5{deg} or less. The angular resolution is about 4.3arcmin and the sensitivity is 50mK T_B_ (or 20mJy/beam area). Additionally a catalog of 1212 small diameter radio sources has been compiled.
289. 20cm survey of the AKARI SEP (ATCA-ADFS)
ID:
ivo://CDS.VizieR/J/MNRAS/427/1830
Title:
20cm survey of the AKARI SEP (ATCA-ADFS)
Short Name:
J/MNRAS/427/1830
Date:
21 Oct 2021
Publisher:
CDS
Description:
The results of a deep radio survey at 20cm wavelength are reported for a region containing the AKARI Deep Field South (ADF-S) near the South Ecliptic Pole (SEP), using the Australia Telescope Compact Array (ATCA). The survey (hereafter referred to as the ATCA-ADFS survey) has 1{sigma} detection limits ranging from 18.7 to 50{mu}Jy/beam over an area of ~1.1deg^2^, and ~ 2.5deg^2^ to lower sensitivity. The observations, data reduction and source count analysis are presented along with a description of the overall scientific objectives, and a catalogue containing 530 radio sources detected with a resolution of 6.2x4.9arcsec.
290. CN and CO observations toward AGB stars
ID:
ivo://CDS.VizieR/J/ApJ/690/837
Title:
CN and CO observations toward AGB stars
Short Name:
J/ApJ/690/837
Date:
21 Oct 2021
Publisher:
CDS
Description:
A survey of the ^12^C/^13^C ratio toward circumstellar envelopes has been conducted at millimeter wavelengths using the facilities of the Arizona Radio Observatory (ARO). The ratios were obtained for a sample of 18 local C- and O-rich asymptotic giant branch and supergiant stars from observations of the ^12^C and ^13^C isotopologues of CO and CN, respectively. The J=1->0 transitions of both molecules were observed at {lambda}=3mm using the ARO 12m telescope, while the J=2->1 lines of the two species were measured using the ARO Sub-Millimeter Telescope (SMT) at {lambda}=1mm. The ^12^C/^13^C ratios were determined from the CO data by modeling both transitions simultaneously with a circumstellar radiative transfer code, which can account for the high opacities present in the emission from this species. In the case of CN, the hyperfine structure was used to evaluate opacity effects. Ratios obtained independently from CO and CN are in good agreement.