- ID:
- ivo://CDS.VizieR/J/ApJS/209/12
- Title:
- High-velocity clouds from GASS. I.
- Short Name:
- J/ApJS/209/12
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a catalog of high-velocity clouds (HVCs) from the Galactic All Sky Survey (GASS) of southern sky neutral hydrogen, which has 57mK sensitivity and 1 km/s velocity resolution and was obtained with the Parkes Telescope. Our catalog has been derived from the stray-radiation-corrected second release of GASS. We describe the data and our method of identifying HVCs and analyze the overall properties of the GASS population. We catalog a total of 1693 HVCs at declinations <0{deg}, including 1111 positive velocity HVCs and 582 negative velocity HVCs. Our catalog also includes 295 anomalous velocity clouds (AVCs). The cloud line-widths of our HVC population have a median FWHM of ~19 km/s, which is lower than that found in previous surveys. The completeness of our catalog is above 95% based on comparison with the HIPASS catalog of HVCs upon which we improve by an order of magnitude in spectral resolution. We find 758 new HVCs and AVCs with no HIPASS counterpart. The GASS catalog will shed unprecedented light on the distribution and kinematic structure of southern sky HVCs, as well as delve further into the cloud populations that make up the anomalous velocity gas of the Milky Way.
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- ID:
- ivo://CDS.VizieR/J/ApJS/140/331
- Title:
- High-velocity HI observations at 21cm
- Short Name:
- J/ApJS/140/331
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Very sensitive HI 21cm observations have been made in 860 directions at {delta}>=-43{deg} in search of weak, Galactic, high-velocity HI emission lines at moderate and high Galactic latitudes.
- ID:
- ivo://CDS.VizieR/J/MNRAS/428/1790
- Title:
- HIJASS HI survey in the Ursa Major region
- Short Name:
- J/MNRAS/428/1790
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have conducted the first blind HI survey covering 480deg^2^ and a heliocentric velocity range from 300 to 1900km/s to investigate the HI content of the nearby spiral-rich Ursa Major region and to look for previously uncatalogued gas-rich objects. Here we present the catalogue of HI sources. The HI data were obtained with the four-beam receiver mounted on the 76.2-m Lovell telescope [full width at half-maximum (FWHM) 12-arcmin] at the Jodrell Bank Observatory (UK) as part of the HI Jodrell All Sky Survey (HIJASS). We use the automated source finder DUCHAMP and identify 166 HI sources in the data cubes with HI masses in the range of 107-1010.5M_{sun}_. Our Ursa Major HI catalogue includes 10 first-time detections in the 21-cm emission line. We identify optical counterparts for 165 HI sources (99%). For 54 HI sources (~33%) we find numerous optical counterparts in the HIJASS beam, indicating a high density of galaxies and likely tidal interactions. Four of these HI systems are discussed in detail. We find only one HI source (1%) without a visible optical counterpart out of the 166 HI detections. Green Bank Telescope (FWHM 9-arcmin) follow-up observations confirmed this HI source and its HI properties. The nature of this detection is discussed and compared to similar sources in other HI surveys.
- ID:
- ivo://CDS.VizieR/J/MNRAS/342/738
- Title:
- HI Jodrell All Sky Survey
- Short Name:
- J/MNRAS/342/738
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Details are presented of the H I Jodrell All Sky Survey (HIJASS). HIJASS is a blind neutral hydrogen (H I) survey of the northern sky ({delta}>22{deg}), being conducted using the multibeam receiver on the Lovell Telescope (full width at half-maximum beamwidth 12-arcmin) at Jodrell Bank. HIJASS covers the velocity range -3500 to 10000 km/s, with a velocity resolution of 18.1km/s and spatial positional accuracy of ~2.5arcmin. Thus far about 1115 deg^2^ of sky have been surveyed. The average rms noise during the early part of the survey was around 16mJy/beam Following the first phase of the Lovell Telescope upgrade (in 2001), the rms noise is now around 13mJy/beam. We describe the methods of detecting galaxies within the HIJASS data and of measuring their H I parameters. The properties of the resulting H I-selected sample of galaxies are described. Of the 222 sources so far confirmed, 170 (77 per cent) are clearly associated with a previously catalogued galaxy. A further 23 sources (10 per cent) lie close (within 6 arcmin) to a previously catalogued galaxy for which no previous redshift exists. A further 29 sources (13 per cent) do not appear to be associated with any previously catalogued galaxy.
- ID:
- ivo://CDS.VizieR/J/A+A/430/373
- Title:
- HI lines in 586 galaxies
- Short Name:
- J/A+A/430/373
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper presents 586 new 21-cm neutral hydrogen line measurements carried out with the FORT receiver of the meridian transit Nancay radiotelescope in the period July 2000 - March 2003. This observational programme is part of a larger project aiming at collecting an exhaustive and magnitude-complete HI extragalactic catalogue for Tully-Fisher applications. It is associated with the building of the MIGALE spectroscopic archive and database. http://klun.obs-nancay.fr, http://http://www.sai.msu.su/migale/
- ID:
- ivo://CDS.VizieR/J/A+A/442/137
- Title:
- HI observations of WHISP disk galaxies
- Short Name:
- J/A+A/442/137
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present HI observations of 68 early-type disk galaxies from the WHISP survey. They have morphological types between S0 and Sab and absolute B-band magnitudes between -14 and -22. These galaxies form the massive, high surface-brightness extreme of the disk galaxy population, few of which have been imaged in HI before. The HI properties of the galaxies in our sample span a large range; the average values of MHI/LB and DHI/D25 are comparable to the ones found in later-type spirals, but the dispersions around the mean are larger. No significant differences are found between the S0/S0a and the Sa/Sab galaxies.
- ID:
- ivo://CDS.VizieR/VIII/73
- Title:
- HI Parkes All Sky Survey Catalogue (HIPASS)
- Short Name:
- VIII/73
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The HI Parkes All-Sky Survey (HIPASS) Catalogue forms the largest uniform catalogue of HI sources compiled to date, with 4315 sources identified purely by their HI content. The catalogue data comprise the southern region DE<+2{deg} of HIPASS, the first blind HI survey to cover the entire southern sky. RMS noise for this survey is 13mJy/beam and the velocity range is -1280 to 12700km/s. Data search, verification and parametrization methods are discussed along with a description of measured quantities. Full catalogue data is made available to the astronomical community including positions, velocities, velocity widths, integrated fluxes and peak flux densities. Also available are on-sky moment maps, position- velocity moment maps and spectra of catalogue sources. A number of local large-scale features are observed in the space distribution of sources including the Super-Galactic plane and the Local Void. Notably, large-scale structure is seen at low Galactic latitudes, a region normally obscured at optical wavelengths.
- ID:
- ivo://CDS.VizieR/J/AJ/129/220
- Title:
- HI Parkes Zone of Avoidance Survey
- Short Name:
- J/AJ/129/220
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of the Northern extension of the HI Parkes Zone of Avoidance Survey, a blind HI survey utilizing the multibeam receiver on the Parkes 64m telescope. In the two regions studied here, l=36{deg}-52{deg} and l=196{deg}-212{deg}, |b|<=5{deg}, we have detected 77 HI galaxies, 20 of which have been previously detected in HI. The survey has a median rms noise of 6.0mJy/beam and is complete to a mean flux density of 22mJy. We have searched for multiwavelength counterparts to the 77 galaxies detected here: 19, 27, and 11 have a likely optical, 2MASS (Cat. <VII/233>), and IRAS (Cat. <II/125>) cataloged counterpart, respectively.
- ID:
- ivo://CDS.VizieR/J/AJ/128/16
- Title:
- HIPASS Bright Galaxy Catalog
- Short Name:
- J/AJ/128/16
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the HIPASS Bright Galaxy Catalog (BGC), which contains the 1000 HI brightest galaxies in the southern sky as obtained from the HI Parkes All-Sky Survey (HIPASS, Cat. <VIII/73>). The selection of the brightest sources is based on their HI peak flux density (S_peak_>~116mJy) as measured from the spatially integrated HIPASS spectrum. The derived HI masses range from ~10^7^ to 4x10^10^M_Sun_. While the BGC (z<0.03) is complete in S_peak_, only a subset of ~500 sources can be considered complete in integrated HI flux density (F_HI_>~25Jy.km/s). The HIPASS BGC contains a total of 158 new redshifts. These belong to 91 new sources for which no optical or infrared counterparts have previously been catalogued, an additional 51 galaxies for which no redshifts were previously known, and 16 galaxies for which the catalogued optical velocities disagree.
- ID:
- ivo://CDS.VizieR/J/A+A/594/A116
- Title:
- HI4PI spectra and column density maps
- Short Name:
- J/A+A/594/A116
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Measurement of the Galactic neutral atomic hydrogen (HI) column density, NHI, and brightness temperatures, Tb, is of high scientific value for a broad range of astrophysical disciplines. In the past two decades, one of the most-used legacy HI datasets has been the Leiden/Argentine/Bonn Survey (LAB). We release the HI 4-pi survey (HI4PI), an all-sky database of Galactic HI, which supersedes the LAB survey. The HI4PI survey is based on data from the recently completed first coverage of the Effelsberg-Bonn HI Survey (EBHIS) and from the third revision of the Galactic All-Sky Survey (GASS). EBHIS and GASS share similar angular resolution and match well in sensitivity. Combining both, they are ideally suited to be a successor to LAB. The new HI4PI survey outperforms the LAB in angular resolution (16.1', FWHM) and sensitivity (43mK RMS). Moreover, it has full spatial sampling and thus overcomes a major issue of LAB, which severely undersamples the sky. We publish all-sky column density maps of the neutral atomic hydrogen in the Milky Way, along with full spectroscopic data, in several map projections including HEALPix.
