- ID:
- ivo://CDS.VizieR/J/A+A/505/29
- Title:
- HI observations of 2MASS galaxies in ZoA
- Short Name:
- J/A+A/505/29
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A pilot survey has been made to obtain 21cm HI emission line profiles for 197 objects in the zone of avoidance (ZoA) that were classified as galaxies in the 2MASS all-sky near-infrared Extended Source Catalog (2MASX), as well as a further 16 2MASS pre-release working database sources that did not make it into 2MASX. One hundred sixteen of the 2MASX sources and the 16 working database sources were observed using the Nancay radio telescope, usually in the 325 to 11825km/s range, and the other 81 2MASX sources were observed with the Arecibo radio telescope in the -500 to 11000km/s range, and for 9 also in the 9500 to 21000km/s range.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/366/428
- Title:
- HI observations of nearby dwarf galaxies
- Short Name:
- J/A+A/366/428
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We carried out a systematic search for nearby dwarf galaxies in the northern sky based on POSS-II film copies. As a result we present a list of 101 nearby dwarf galaxy candidates mainly of low surface brightness which have angular diameters a>0.5'. About two thirds of the objects are new discoveries. This sample is considered as a supplement to the 163 northern dwarf galaxy candidates (1998, Cat., <J/A+AS/127/409>) which have been detected in the same declination range around the known Local Volume galaxies and to the 78 dwarf galaxy candidates (1999A&AS..135..221K) in the Local Void region. All the galaxies were observed in HI with the 100-m Effelsberg radio telescope with a detection rate of 46%. The sample of detected galaxies has the following median parameters: radial velocity V_LG_=+770km/s, HI line width W_50_=46km/s, absolute blue magnitude M_B_=-13.8mag, linear diameter A_0_=2.7kpc, hydrogen mass-to-luminosity ratio M_HI_/L_B_=1.2M_{sun}_/L_{sun}_, and the HI mass-to-total mass ratio M_HI_/M_t_=0.28.
- 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/J/MNRAS/352/478
- Title:
- HI obs. of low surface brightness dwarf gal.
- Short Name:
- J/MNRAS/352/478
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- According to the cold dark matter (CDM) hierarchical clustering theory of galaxy and large-scale structure formation, there should be numerous low-mass dark matter haloes present in the Universe today. If these haloes contain sufficient stars, they should be detectable as low-luminosity stellar systems or dwarf galaxies. We have previously described a new detection method for faint low surface brightness objects and we have shown that there are relatively large numbers of very faint dwarf galaxies in the nearby Virgo cluster. In this paper, we present results from a similar survey carried out on the Millennium Galaxy strip (MGS, cat. <VII/240>), which runs along the celestial equator and samples a very different galaxy environment.
- 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/MNRAS/361/34
- Title:
- HIPASS catalogue. III.
- Short Name:
- J/MNRAS/361/34
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the largest catalogue to date of optical counterparts for H i radio-selected galaxies, HOPCAT. Of the 4315 H i radio-detected sources from the HI Parkes All Sky Survey (HIPASS) catalogue, we find optical counterparts for 3618 (84 per cent) galaxies. Of these, 1798 (42 per cent) have confirmed optical velocities and 848 (20 per cent) are single matches without confirmed velocities. Some galaxy matches are members of galaxy groups. From these multiple galaxy matches, 714 (16 per cent) have confirmed optical velocities and a further 258 (6 per cent) galaxies are without confirmed velocities. For 481 (11 per cent), multiple galaxies are present but no single optical counterpart can be chosen and 216 (5 per cent) have no obvious optical galaxy present. Most of these "blank fields" are in crowded fields along the Galactic plane or have high extinctions. Isolated "dark galaxy" candidates are investigated using an extinction cut of A_Bj_<1mag and the blank-fields category. Of the 3692 galaxies with an A+Bj_ extinction <1mag, only 13 are also blank fields. Of these, 12 are eliminated either with follow-up Parkes observations or are in crowded fields. The remaining one has a low surface brightness optical counterpart. Hence, no isolated optically dark galaxies have been found within the limits of the HIPASS survey.
- ID:
- ivo://CDS.VizieR/J/AJ/123/873
- Title:
- HIPASS high-velocity clouds
- Short Name:
- J/AJ/123/873
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A catalog of southern anomalous-velocity HI clouds at {delta}<+2{deg} is presented. This catalog is based on data from the HI Parkes All-Sky Survey (HIPASS) reprocessed with the MINMED5 procedure and searched with a new high-velocity cloud-finding algorithm. The improved sensitivity (5{sigma}: {Delta}T_B_=0.04K), resolution (15.5'), and velocity range (-500km/s<V_LSR_<+500km/s) of the HIPASS data result in a substantial increase in the number of individual clouds (1956, as well as 41 galaxies) compared with what was known from earlier southern data. The method of cataloging the anomalous-velocity objects is described, and a catalog of key cloud parameters, including velocity, angular size, peak column density, total flux, position angle, and degree of isolation, is presented.
149. HIPASS in Fornax
- ID:
- ivo://CDS.VizieR/J/MNRAS/337/641
- Title:
- HIPASS in Fornax
- Short Name:
- J/MNRAS/337/641
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using data from the HI Parkes All Sky Survey (HIPASS), we have searched for neutral hydrogen in galaxies in a region <25x25{deg}^2^ centred on NGC 1399, the nominal centre of the Fornax cluster. Within a velocity search range of 300-3700km/s and to a 3 lower flux limit of ~40mJy, 110 galaxies with HI emission were detected, one of which is previously uncatalogued. None of the detections has early-type morphology. Previously unknown velocities for 14 galaxies have been determined, with a further four velocity measurements being significantly dissimilar to published values. Identification of an optical counterpart is relatively unambiguous for more than ~90 per cent of our HI galaxies. The galaxies appear to be embedded in a sheet at the cluster velocity which extends for more than 30across the search area. At the nominal cluster distance of ~20Mpc, this corresponds to an elongated structure more than 10Mpc in extent. A velocity gradient across the structure is detected, with radial velocities increasing by ~500km/s from south-east to north-west. The clustering of galaxies evident in optical surveys is only weakly suggested in the spatial distribution of our HI detections. Of 62 HI detections within a 10{deg} projected radius of the cluster centre, only two are within the core region (projected radius <1{deg}) and less than 30 per cent are within 3.5{deg}, suggesting a considerable deficit of HI-rich galaxies in the centre of the cluster. However, relative to the field, there is a 3(+/-1)-fold excess of HI-rich galaxies in the outer parts of the cluster where galaxies may be infalling towards the cluster for the first time.
- ID:
- ivo://CDS.VizieR/J/MNRAS/467/3172
- Title:
- HI photoionization rate at z<0.5 for 79 QSOs
- Short Name:
- J/MNRAS/467/3172
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have developed a parallel code called the VoIgt profile Parameter Estimation Routine (VIPER) for automatically fitting the HI Ly{alpha} forest seen in the spectra of quasi-stellar objects (QSOs). We obtained the HI column density distribution function (CDDF) and linewidth (b) parameter distribution for z<0.45 using spectra of 82 QSOs obtained using the Cosmic Origins Spectrograph and VIPER. The consistency of these with existing measurements in the literature validates our code. By comparing this CDDF with those obtained from hydrodynamical simulations, we constrain the H I photoionization rate ({Gamma}_HI_) at z<0.45 in four redshift bins. VIPER, together with the Code for Ionization and Temperature Evolution (CITE), which we developed for GADGET-2, allows us to explore parameter space and perform {chi}^2^ minimization to obtain {Gamma}_HI_. We notice that the b parameters from the simulations are smaller than those derived from observations. We show that the observed b parameter distribution and b versus logNHI scatter can be reproduced in simulations by introducing subgrid-scale turbulence. However, it has very little influence on the derived {Gamma}_HI_. The {Gamma}_HI_(z) obtained here, (3.9+/-0.1)x10^-14^(1+z)^4.98+/-0.11^s^-1^, is in good agreement with the values derived by us using flux-based statistics in a previous article. These values are consistent with the hydrogen ionizing ultraviolet (UV) background being dominated mainly by QSOs, without needing any contribution from non-standard sources of UV photons.
