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3611. Deep infrared photometry of {sigma} Ori cluster
ID:
ivo://CDS.VizieR/J/ApJ/743/64
Title:
Deep infrared photometry of {sigma} Ori cluster
Short Name:
J/ApJ/743/64
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a deep I, Z photometric survey covering a total area of 1.12deg^2^ of the {sigma} Orionis cluster and reaching completeness magnitudes of I=22 and Z=21.5mag. From I, I-Z color-magnitude diagrams we have selected 153 candidates that fit the previously known sequence of the cluster. They have magnitudes in the range I=16-23mag, which corresponds to a mass interval from 0.1 down to 0.008M_{sun}_ at the most probable age of {sigma} Orionis (2-4Myr). Using J-band photometry, we find that 124 of the 151 candidates within the completeness of the optical survey (82%) follow the previously known infrared photometric sequence of the cluster and are probably members. We have studied the spatial distribution of the very low mass stars and brown dwarf population of the cluster and found that there are objects located at distances greater than 30 arcmin to the north and west of {sigma} Orionis that probably belong to different populations of the Orion's Belt. For the 102 bona fide {sigma} Orionis cluster member candidates, we find that the radial surface density can be represented by a decreasing exponential function ({sigma}={sigma}_0_e^-r/r_0_^) with a central density of {sigma}_0_=0.23+/-0.03 objects arcmin^-2^ and a characteristic radius of r_0_=9.5+/-0.7 arcmin. Using near-infrared JHK-band data from Two Micron All Sky Survey and UKIRT Deep Infrared Sky Survey and mid-infrared data from Infrared Array Camera/Spitzer, we find that about 5%-9% of the brown dwarf candidates in the {sigma} Orionis cluster have K-band excesses and 30%+/-7% of them show mid-infrared excesses at wavelengths longer than 5.8um. These are probably related to the presence of disks, most of which are "transition disks".
3612. Deep JVLA imaging of GOODS-N at 20cm
ID:
ivo://CDS.VizieR/J/ApJS/235/34
Title:
Deep JVLA imaging of GOODS-N at 20cm
Short Name:
J/ApJS/235/34
Date:
08 Mar 2022 13:27:20
Publisher:
CDS
Description:
New wideband continuum observations in the 1-2GHz band of the GOODS-N field using NSF's Karl G. Jansky Very Large Array (VLA) are presented. The best image with an effective frequency of 1525MHz reaches an rms noise in the field center of 2.2{mu}Jy, with 1.6" resolution. A catalog of 795 sources is presented covering a radius of 9 arcminutes centered near the nominal center for the GOODS-N field, very near the nominal VLA pointing center for the observations. Optical/NIR identifications and redshift estimates both from ground-based and HST observations are discussed. Using these optical/NIR data, it is most likely that fewer than 2% of the sources without confusion problems do not have a correct identification. A large subset of the detected sources have radio sizes >1". It is shown that the radio orientations for such sources correlate well with the HST source orientations, especially for z<1. This suggests that a least a large subset of the 10kpc-scale disks of luminous infrared/ultraluminous infrared galaxies (LIRG/ULIRG) have strong star formation, not just in the nucleus. For the half of the objects with z>1, the sample must be some mixture of very high star formation rates, typically 300M_{sun}_/yr, assuming pure star formation, and an active galactic nucleus (AGN) or a mixed AGN/star formation population.
3613. Deep learning classification in asteroseismology
ID:
ivo://CDS.VizieR/J/MNRAS/469/4578
Title:
Deep learning classification in asteroseismology
Short Name:
J/MNRAS/469/4578
Date:
21 Oct 2021
Publisher:
CDS
Description:
In the power spectra of oscillating red giants, there are visually distinct features defining stars ascending the red giant branch from those that have commenced helium core burning. We train a 1D convolutional neural network by supervised learning to automatically learn these visual features from images of folded oscillation spectra. By training and testing on Kepler red giants, we achieve an accuracy of up to 99 per cent in separating helium-burning red giants from those ascending the red giant branch. The convolutional neural network additionally shows capability in accurately predicting the evolutionary states of 5379 previously unclassified Kepler red giants, by which we now have greatly increased the number of classified stars.
3614. Deep Magellan/Megacam obs. of 4 MW satellites
ID:
ivo://CDS.VizieR/J/ApJ/863/25
Title:
Deep Magellan/Megacam obs. of 4 MW satellites
Short Name:
J/ApJ/863/25
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present deep Magellan/Megacam stellar photometry of four recently discovered faint Milky Way satellites: Sagittarius II (Sgr II), Reticulum II (Ret II), Phoenix II (Phe II), and Tucana III (Tuc III). Our photometry reaches ~2-3 magnitudes deeper than the discovery data, allowing us to revisit the properties of these new objects (e.g., distance, structural properties, luminosity measurements, and signs of tidal disturbance). The satellite color-magnitude diagrams show that they are all old (~13.5Gyr) and metal poor ([Fe/H]<~-2.2). Sgr II is particularly interesting, as it sits in an intermediate position between the loci of dwarf galaxies and globular clusters in the size-luminosity plane. The ensemble of its structural parameters is more consistent with a globular cluster classification, indicating that Sgr II is the most extended globular cluster in its luminosity range. The other three satellites land directly on the locus defined by Milky Way ultra-faint dwarf galaxies of similar luminosity. Ret II is the most elongated nearby dwarf galaxy currently known for its luminosity range. Our structural parameters for Phe II and Tuc III suggest that they are both dwarf galaxies. Tuc III is known to be associated with a stellar stream, which is clearly visible in our matched-filter stellar density map. The other satellites do not show any clear evidence of tidal stripping in the form of extensions or distortions. Finally, we also use archival HI data to place limits on the gas content of each object.
3615. Deep MERLIN 5GHz radio sources in M82
ID:
ivo://CDS.VizieR/J/MNRAS/391/1384
Title:
Deep MERLIN 5GHz radio sources in M82
Short Name:
J/MNRAS/391/1384
Date:
21 Oct 2021
Publisher:
CDS
Description:
The results of an extremely deep, 8-d long observation of the central kpc of the nearby starburst galaxy M82 using Multi-Element Radio Linked Interferometer Network (MERLIN) at 5GHz are presented. The 17{mu}Jy/beam rms noise level in the naturally weighted image makes it the most sensitive high-resolution radio image of M82 made to date. Over 50 discrete sources are detected, the majority of which are supernova remnants, but with 13 identified as H ii regions. Sizes, flux densities and radio brightnesses are given for all of the detected sources, which are all well resolved with a majority showing shell or partial shell structures. Those sources within the sample which are supernova remnants have diameters ranging from 0.3 to 6.7pc, with a mean size of 2.9pc.
3616. Deep 610MHz survey of ELAIS-N1 sources
ID:
ivo://CDS.VizieR/J/MNRAS/383/75
Title:
Deep 610MHz survey of ELAIS-N1 sources
Short Name:
J/MNRAS/383/75
Date:
21 Oct 2021
Publisher:
CDS
Description:
Observations of the ELAIS-N1 field taken at 610MHz with the Giant Metrewave Radio Telescope are presented. Nineteen pointings were observed, covering a total area of 9 square degrees with a resolution of 6x5arcsec^2^, PA=45deg. Four of the pointings were deep observations with an rms of ~40uJy before primary beam correction, with the remaining fifteen pointings having an rms of ~70uJy. The techniques used for data reduction and production of a mosaicked image of the region are described, and the final mosaic, along with a catalogue of 2500 sources detected above 6{sigma}, are presented. This work complements the large amount of optical and infrared data already available on the region. For further details of the surveys and data analysis procedures please refer to the published paper.
3617. Deep MIPS observations of IC 348 nebula
ID:
ivo://CDS.VizieR/J/AJ/138/703
Title:
Deep MIPS observations of IC 348 nebula
Short Name:
J/AJ/138/703
Date:
21 Oct 2021
Publisher:
CDS
Description:
We describe new, deep MIPS photometry and new high signal-to-noise optical spectroscopy of the 2.5Myr old IC 348 Nebula. To probe the properties of the IC 348 disk population, we combine these data with previous optical/infrared photometry and spectroscopy to identify stars with gas accretion, to examine their mid-IR colors, and to model their spectral energy distributions.
3618. Deep Multicolor Survey. IV.
ID:
ivo://CDS.VizieR/J/ApJS/119/189
Title:
Deep Multicolor Survey. IV.
Short Name:
J/ApJS/119/189
Date:
21 Oct 2021
Publisher:
CDS
Description:
This stellar catalog contains 19,494 objects from the Deep Multicolor Survey (DMS) and results from follow-up spectroscopic observations of 234 objects in the catalog. The DMS is based on CCD imaging with the Mayall 4 m telescope in U, B, V, R', I75, and I86 and covers 0.83 deg^2 in six fields at high Galactic latitude. The survey reached 5 sigma limiting magnitudes of 22.1 in I86 to 23.8 in B. The catalog gives positions, magnitudes and error estimates, and classification codes in the six filter bands for all the objects. In addition, the survey is useful for the study of faint field galaxies and of faint stars at high Galactic latitude. Presented are tables that summarize the spectroscopic results for the 55 quasars, 44 compact narrow emission-line galaxies, and 135 stars in the DMS that we have confirmed to date. Also included are illustrations of all the spectra.
3619. Deep Near Infrared Survey of the Southern Sky (DENIS)
ID:
ivo://wfau.roe.ac.uk/denis-dsa
Title:
Deep Near Infrared Survey of the Southern Sky (DENIS)
Date:
04 Dec 2019 13:34:37
Publisher:
WFAU, Institute for Astronomy, University of Edinburgh
Description:
Catalog of astrometry and photometry of detected point sources in the Far red optical (0.82-micron I-band) and near-infrared (1.25-micron J- and 2.15-micron Ks bands). ~16,700 square degrees of the southern sky
3620. Deep Near-Infrared Survey of the Southern Sky (DENIS) Catalog
ID:
ivo://irsa.ipac/DENIS/Catalog
Title:
Deep Near-Infrared Survey of the Southern Sky (DENIS) Catalog
Short Name:
DENIS
Date:
04 Dec 2017 21:44:08
Publisher:
NASA/IPAC Infrared Science Archive
Description:
This data release, from 2005 September, consists of 355,220,325 point sources detected by DENIS. The release contains 3662 strips, each of which is 30 degrees long in Declination and 12 arcmin wide in Right Ascension (with an overlap of 2 arcminutes between consecutive strips), and covers approximately 16,700 square degrees of the southern sky. The northernmost declination covered is ~+02d07m and the southernmost is ~-87d37m. Multiple detections of single point sources have been merged in image overlaps within individual strips, but sources can have multiple detections in overlapping strips. DENIS observations began at the end of 1995 and were completed on 09 September 2001. The survey was conducted simultaneously in three bands: one optical band (Gunn-i at 0.82um, hereafter referred to as "I") and two near-infrared bands (J at 1.25um and Ks at 2.15um), with limiting magnitudes of 18.5 mag, 16.5 mag, and 14.0 mag and saturation magnitudes of 9.8 mag, 7.5 mag, and 6 mag at I, J, and Ks, respectively. Documentation at CDS states that the astrometric accuracy of a typical point source is better than 1 arcsec and photometric accuracy is better than 0.1 mag, although the range of SNR over which these apply is not specified. DENIS was conducted by a European consortium using the 1m telescope at the European Southern Observatory in La Silla, Chile.

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