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831. HET Massive Galaxy Survey (HETMGS)
ID:
ivo://CDS.VizieR/J/ApJS/218/10
Title:
HET Massive Galaxy Survey (HETMGS)
Short Name:
J/ApJS/218/10
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have conducted an optical long-slit spectroscopic survey of 1022 galaxies using the 10m Hobby-Eberly Telescope (HET) at McDonald Observatory. The main goal of the HET Massive Galaxy Survey (HETMGS) is to find nearby galaxies that are suitable for black hole mass measurements. In order to measure accurately the black hole mass, one should kinematically resolve the region where the black hole dominates the gravitational potential. For most galaxies, this region is much less than an arcsecond. Thus, black hole masses are best measured in nearby galaxies with telescopes that obtain high spatial resolution. The HETMGS focuses on those galaxies predicted to have the largest sphere-of-influence, based on published stellar velocity dispersions or the galaxy fundamental plane. To ensure coverage over galaxy types, the survey targets those galaxies across a face-on projection of the fundamental plane. We present the sample selection and resulting data products from the long-slit observations, including central stellar kinematics and emission line ratios. The full data set, including spectra and resolved kinematics, is available online. Additionally, we show that the current crop of black hole masses are highly biased toward dense galaxies and that especially large disks and low dispersion galaxies are under-represented. This survey provides the necessary groundwork for future systematic black hole mass measurement campaigns.
832. HI All-Sky Continuum Survey
ID:
ivo://nasa.heasarc/skyview/408mhz
Title:
HI All-Sky Continuum Survey
Short Name:
408MHz
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
This survey is a mosaic of data taken at Jodrell Bank, Effelsberg and Parkes telescopes. The data was distributed in the NRAO <i>Images from the Radio Sky</i> CD ROM. Provenance: Max Planck Institute for Radio Astronomy, generated by Glyn Haslam. This is a service of NASA HEASARC.
833. HI clouds around the Galactic Center
ID:
ivo://CDS.VizieR/J/ApJ/770/L4
Title:
HI clouds around the Galactic Center
Short Name:
J/ApJ/770/L4
Date:
21 Oct 2021
Publisher:
CDS
Description:
We describe a population of small, high-velocity, atomic hydrogen clouds, loops, and filaments found above and below the disk near the Galactic center. The objects have a mean radius of 15pc, velocity widths of ~14km/s, and are observed at |z| heights up to 700pc. The velocity distribution of the clouds shows no signature of Galactic rotation. We propose a scenario where the clouds are associated with an outflow from a central star-forming region at the Galactic center. We discuss the clouds as entrained material traveling at ~200km/s in a Galactic wind.
834. HI clouds in Quadrant I of the Milky Way
ID:
ivo://CDS.VizieR/J/ApJ/722/367
Title:
HI clouds in Quadrant I of the Milky Way
Short Name:
J/ApJ/722/367
Date:
21 Oct 2021
Publisher:
CDS
Description:
Using 21cm HI observations from the Parkes Radio Telescope's Galactic All-Sky Survey, we measure 255 HI clouds in the lower Galactic halo that are located near the tangent points at 16.9<=l<=35.3{deg} and |b|<~20{deg}. The clouds have a median mass of 700M_{sun}_ and a median distance from the Galactic plane of 660pc.
835. Hidden population of AM CVns in the SDSS
ID:
ivo://CDS.VizieR/J/MNRAS/429/2143
Title:
Hidden population of AM CVns in the SDSS
Short Name:
J/MNRAS/429/2143
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the latest results from a spectroscopic survey designed to uncover the hidden population of AM Canum Venaticorum (AM CVn) binaries in the photometric database of the Sloan Digital Sky Survey (SDSS). We selected ~2000 candidates based on their photometric colours, a relatively small sample which is expected to contain the majority of all AM CVn binaries in the SDSS (expected to be ~50). We present two new candidate AM CVn binaries discovered using this strategy: SDSS J104325.08+563258.1 and SDSS J173047.59+554518.5. We also present spectra of 29 new cataclysmic variables, 23 DQ white dwarfs and 21 DZ white dwarfs discovered in this survey. The survey is now approximately 70 per cent complete, and the discovery of seven new AM CVn binaries indicates a lower space density than previously predicted. From the essentially complete g~19 sample, we derive an observed space density of (5+/-3)*10^-7^pc^-3^; this is lower than previous estimates by a factor of 3. The sample has been cross-matched with the GALEX All-Sky Imaging Survey database, and with Data Release 9 of the UKIRT (United Kingdom Infrared Telescope) Infrared Deep Sky Survey (UKIDSS). The addition of UV photometry allows new colour cuts to be applied, reducing the size of our sample to ~1100 objects. Optimising our followup should allow us to uncover the remaining AM CVn binaries present in the SDSS, providing the larger homogeneous sample required to more reliably estimate their space density.
836. HIDEEP survey
ID:
ivo://CDS.VizieR/J/MNRAS/346/787
Title:
HIDEEP survey
Short Name:
J/MNRAS/346/787
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have carried out an extremely long integration time (9000s/beam) 21-cm blind survey of 60deg^2^ in Centaurus using the Parkes multibeam system. We find that the noise continues to fall as sqrt(t_obs_) throughout, enabling us to reach an H I column-density limit of 4.2x10^18^cm^-2^ for galaxies with a velocity width of 200km/s in the central 32deg^2^ region, making this the deepest survey to date in terms of column density sensitivity. The H I data are complemented by very deep optical observations from digital stacking of multi-exposure UK Schmidt Telescope R-band films, which reach an isophotal level of 26.5Rmag/arcsec^2^ (27.5Bmag/arcsec^2^). 173 H I sources have been found, 96 of which have been uniquely identified with optical counterparts in the overlap area.
837. Hi-GAL compact source catalog. -71.0<l<67.0
ID:
ivo://CDS.VizieR/J/MNRAS/471/100
Title:
Hi-GAL compact source catalog. -71.0<l<67.0
Short Name:
J/MNRAS/471/100
Date:
21 Oct 2021
Publisher:
CDS
Description:
Hi-GAL (Herschel InfraRed Galactic Plane Survey) is a large-scale survey of the Galactic plane, performed with Herschelin five infrared continuum bands between 70 and 500{mu}m. We present a band-merged catalogue of spatially matched sources and their properties derived from fits to the spectral energy distributions (SEDs) and heliocentric distances, based on the photometric catalogues presented in Molinari et al., covering the portion of Galactic plane -71.0{deg}<l<67.0{deg}. The band-merged catalogue contains 100 922 sources with a regular SED, 24584 of which show a 70-{mu}m counterpart and are thus considered protostellar, while the remainder are considered starless. Thanks to this huge number of sources, we are able to carry out a preliminary analysis of early stages of star formation, identifying the conditions that characterize different evolutionary phases on a statistically significant basis. We calculate surface densities to investigate the gravitational stability of clumps and their potential to form massive stars. We also explore evolutionary status metrics such as the dust temperature, luminosity and bolometric temperature, finding that these are higher in protostellar sources compared to pre-stellar ones. The surface density of sources follows an increasing trend as they evolve from pre-stellar to protostellar, but then it is found to decrease again in the majority of the most evolved clumps. Finally, we study the physical parameters of sources with respect to Galactic longitude and the association with spiral arms, finding only minor or no differences between the average evolutionary status of sources in the fourth and first Galactic quadrants, or between 'on-arm' and 'interarm' positions.
838. Hi-GAL. inner Milky Way: +68>=l>=70
ID:
ivo://CDS.VizieR/J/A+A/591/A149
Title:
Hi-GAL. inner Milky Way: +68>=l>=70
Short Name:
J/A+A/591/A149
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the first public release of high-quality data products (DR1) from Hi-GAL, the Herschel infrared Galactic Plane Survey. Hi-GAL is the keystone of a suite of continuum Galactic plane surveys from the near-IR to the radio and covers five wavebands at 70, 160, 250, 350 and 500{mu}m, encompassing the peak of the spectral energy distribution of cold dust for 8<~T<~50K. This first Hi-GAL data release covers the inner Milky Way in the longitude range 68{deg}>~l>~-70{deg} in a |b|<=1{deg} latitude strip. Photometric maps have been produced with the ROMAGAL pipeline, which optimally capitalizes on the excellent sensitivity and stability of the bolometer arrays of the Herschel PACS and SPIRE photometric cameras. It delivers images of exquisite quality and dynamical range, absolutely calibrated with Planck and IRAS, and recovers extended emission at all wavelengths and all spatial scales, from the point-spread function to the size of an entire 2{deg}x2{deg} "tile" that is the unit observing block of the survey. The compact source catalogues were generated with the CuTEx algorithm, which was specifically developed to optimise source detection and extraction in the extreme conditions of intense and spatially varying background that are found in the Galactic plane in the thermal infrared. Hi-GAL DR1 images are cirrus noise limited and reach the 1{sigma}-rms predicted by the Herschel Time Estimators for parallel-mode observations at 60"/s scanning speed in relatively low cirrus emission regions. Hi-GAL DR1 images will be accessible through a dedicated web-based image cutout service. The DR1 Compact Source Catalogues are delivered as single-band photometric lists containing, in addition to source position, peak, and integrated flux and source sizes, a variety of parameters useful to assess the quality and reliability of the extracted sources. Caveats and hints to help in this assessment are provided. Flux completeness limits in all bands are determined from extensive synthetic source experiments and greatly depend on the specific line of sight along the Galactic plane because the background strongly varies as a function of Galactic longitude. Hi-GAL DR1 catalogues contain 120581, 291858, 280143, 161946, and 85811 compact sources in the five bands.
839. High energy peaked BL Lacs optical spectros.
ID:
ivo://CDS.VizieR/J/A+A/470/787
Title:
High energy peaked BL Lacs optical spectros.
Short Name:
J/A+A/470/787
Date:
21 Oct 2021
Publisher:
CDS
Description:
The multi-frequency sedentary survey is a flux-limited, statistically well-defined sample of highly X-ray dominated (i.e., with a very high X-ray to radio flux ratio) BL Lacertae objects, which includes 150 sources. In this paper, the third of the series, we report the results of a dedicated optical spectroscopy campaign that, together with results from other independent optical follow-up programs, led to the spectroscopic identification of all sources in the sample. We carried out a systematic spectroscopic campaign for the observation of all unidentified objects of the sample using the ESO 3.6m, the KPNO 4m, and the TNG optical telescopes.
840. High-latitude H-alpha emission stars
ID:
ivo://CDS.VizieR/J/ApJ/300/779
Title:
High-latitude H-alpha emission stars
Short Name:
J/ApJ/300/779
Date:
21 Oct 2021
Publisher:
CDS
Description:
Approximately 1300 5.2x5.2deg^2^ red-sensitive objective prism plates have been searched for H{alpha}-emission stars in order to complete the search of the entire sky. The survey here reported represents 59% of the whole sky, defined by the region north of declination -25{deg} and mostly further than 10{deg} from the Galactic plane; the omitted portions had already been surveyed, in part at Warner and Swasey, in part elsewhere. Two hundred and six stars have been newly found, mostly of unknown spectral type. The stars' latitude distribution suggest that they are mainly moderately high luminosity disk population stars. There are new finds especially in Orion and the Taurus dark clouds (limiting mag ~13).

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