Second Data Release of the All-sky NOIRLab Source Catalog

Nidever, David L.; Dey, Arjun; Fasbender, K. M.; Juneau, Stéphanie; Meisner, Aaron M.; Wishart, Joseph; Scott, A.; Matt, Kyle; Nikutta, Robert; Pucha, Ragadeepika

doi:10.3847/1538-3881/abd6e1

Cited by 41 publications

(21 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To derive stellar masses for the associated galaxies, we supplement the HST F814W magnitudes with additional photometry from surveys hosted on NOIRLab's Astro Data Lab. 19 Specifically, we use these catalogs: Legacy Survey data release 8 (g, r, z, W1, W2 filters; Dey et al 2019), NOIRLab Source Catalog data release 2 (g, r, i, z filters; Nidever et al 2018Nidever et al , 2021, 2MASS point source catalog (J, H, K s filters; Skrutskie et al 2006), and unWISE (W1, W2 filters; Schlafly et al 2019). The NOIRLab Source Catalog also includes photometry in the Y and V R bands, but we do not use those filters for this analysis.…”

Section: Additional Propertiesmentioning

confidence: 99%

The Bimodal Absorption System Imaging Campaign (BASIC) I. A Dual Population of Low-metallicity Absorbers at z $<1$

Berg¹,

Lehner²,

Howk³

et al. 2022

Preprint

View full text Add to dashboard Cite

The bimodal absorption system imaging campaign (BASIC) aims to characterize the galaxy environments of a sample of 36 H I-selected partial Lyman limit systems (pLLSs) and Lyman limit systems (LLSs) in 23 QSO fields at z 1. These pLLSs/LLSs provide a unique sample of absorbers with unbiased and well-constrained metallicities, allowing us to explore the origins of metal-rich and low-metallicity circumgalactic medium (CGM) at z < 1. Here we present Keck/KCWI and VLT/MUSE observations of 11 of these QSO fields (19 pLLSs) that we combine with HST/ACS imaging to identify and characterize the absorber-associated galaxies at 0.16 z 0.84. We find 23 unique absorberassociated galaxies, with an average of one associated galaxy per absorber. For seven absorbers, all with < 10% solar metallicities, we find no associated galaxies with log M 9.0 within ρ/R vir and |∆v|/v esc ≤ 1.5 with respect to the absorber. We do not find any strong correlations between the metallicities or H I column densities of the gas and most of the galaxy properties, except for the stellar mass of the galaxies: the low-metallicity ([X/H] ≤ −1.4) systems have a probability of 0.39 +0.16 −0.15 for having a host galaxy with log M ≥ 9.0 within ρ/R vir ≤ 1.5, while the higher metallicity absorbers have a probability of 0.78 +0.10 −0.13 . This implies metal-enriched pLLSs/LLSs at z < 1 are typically associated with the CGM of galaxies with log M > 9.0, whereas low-metallicity pLLSs/LLSs are found in more diverse locations, with one population arising in the CGM of galaxies and another more broadly distributed in overdense regions of the universe. Using absorbers not associated with galaxies, we estimate the unweighted geometric mean metallicity of the intergalactic medium to be [X/H] −2.1 at z < 1, which is lower than previously estimated.

show abstract

Section: Additional Propertiesmentioning

confidence: 99%

The Bimodal Absorption System Imaging Campaign (BASIC) I. A Dual Population of Low-metallicity Absorbers at z $<1$

Berg¹,

Lehner²,

Howk³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…NSC DR2 (Nidever et al 2021) is based on public image data from the NOIRLab Astro Data Archive. These images come from telescopes in both hemispheres (CTIO − 4 m + DECam, KPNO − 4 m + Mosaic3, and Bok − 2.3 m + 90″) and cover ∼35,000 square degrees of the sky.…”

Section: Noirlab Source Catalog Dr2mentioning

confidence: 99%

“…Identifying comoving companions has become easier through the use of large, multiepoch surveys such as the Wide-field Infrared Survey Explorer (WISE; Wright et al 2010), the Gaia Mission (Gaia Collaboration et al 2016), or the DESI Legacy Imaging Surveys (Dey et al 2019). Resulting catalogs like CatWISE2020 (Marocco et al 2021), Gaia DR2 (Gaia Collaboration et al 2018), Gaia EDR3 (Gaia Collaboration et al 2021 or NSC DR2 (Nidever et al 2021) are excellent resources for finding late-type moving objects and their potential companions by using the provided proper motions. Two objects sufficiently close to each other on the sky and having comparable proper motions can provide a basis for inferring a common origin.…”

Section: Introductionmentioning

confidence: 99%

Discovery of 34 Low-mass Comoving Systems Using NOIRLab Source Catalog DR2

Kiwy

Faherty

Meisner

et al. 2022

Self Cite

View full text Add to dashboard Cite

We present the discovery of 34 comoving systems containing an ultracool dwarf found by means of the NOIRLab Source Catalog (NSC) DR2. NSC’s angular resolution of ∼ 1″ allows for the detection of small separation binaries with significant proper motions. We used the catalog’s accurate proper motion measurements to identify the companions by cross-matching a previously compiled list of brown dwarf candidates with NSC DR2. The comoving pairs consist of either a very low-mass star and an ultracool companion, or a white dwarf and an ultracool companion. The estimated spectral types of the primaries are in the K and M dwarf regimes, those of the secondaries in the M, L, and T dwarf regimes. We calculated angular separations between ∼2″ and ∼ 56″, parallactic distances between ∼43 and ∼261 pc, and projected physical separations between ∼169 and ∼8487 au. The lowest measured total proper motion is 97 mas yr−1, with the highest 314 mas yr−1. Tangential velocities range from ∼23 to ∼187 km s−1. We also determined comoving probabilities, estimated mass ratios, and calculated binding energies for each system. We found no indication of possible binarity for any component of the 34 systems in the published literature. The discovered systems can contribute to the further study of the formation and evolution of low-mass systems as well as to the characterization of cool substellar objects.

show abstract

“…As introduced above, although the identifications of astrophysically variable stars using the the variability indices has a low true positive rate (TPR), they can be used to identify stars of constant luminosity at a very high TPR since the light variations caused by image quality will not increase the FPR of non-variable sources. The setting of the thresholds for variability indices is usually arbitrary (see Bellm et al 2019;Nidever et al 2021;Kupfer et al 2021). In the photometric calibration process (shown in Section 3), a fixed threshold 1/𝜂 ≤ 0.8 is empirically set to identify non-variable sources.…”

Section: Variability Detectionmentioning

confidence: 99%

Minute-cadence Observations of the LAMOST Fields with the TMTS: I. Methodology of Detecting Short-period Variables and Results from the first-year Survey

Lin,

Wang,

et al. 2021

Preprint

View full text Add to dashboard Cite

Tsinghua University-Ma Huateng Telescopes for Survey (TMTS), located at Xinglong Station of NAOC, has a field of view up to 18 deg 2 . The TMTS has started to monitor the LAMOST sky areas since 2020, with the uninterrupted observations lasting for about 6 hours on average for each sky area and a cadence of about 1 minute. Here we introduce the data analysis and preliminary scientific results for the first-year observations, which covered 188 LAMOST plates (≈ 1970 deg 2 ). These observations have generated over 4.9 million uninterrupted light curves, with at least 100 epochs for each of them. These light curves correspond to 4.26 million Gaia-DR2 sources, among which 285 thousand sources are found to have multi-epoch spectra from the LAMOST. By analysing these light curves with the Lomb-Scargle periodograms, we identify more than 3700 periodic variable star candidates with periods below ≈ 7.5 hours, primarily consisting of eclipsing binaries and 𝛿 Scuti stars. Those short-period binaries will provide important constraints on theories of binary evolution and possible sources for space gravitational wave experiments in the future. Moreover, we also identified 42 flare stars by searching rapidly-evolving signals in the light curves. The densely-sampled light curves from the TMTS allow us to better quantify the shapes and durations for these flares.

show abstract

Second Data Release of the All-sky NOIRLab Source Catalog

Cited by 41 publications

References 65 publications

The Bimodal Absorption System Imaging Campaign (BASIC) I. A Dual Population of Low-metallicity Absorbers at z $<1$

The Bimodal Absorption System Imaging Campaign (BASIC) I. A Dual Population of Low-metallicity Absorbers at z $<1$

Discovery of 34 Low-mass Comoving Systems Using NOIRLab Source Catalog DR2

Minute-cadence Observations of the LAMOST Fields with the TMTS: I. Methodology of Detecting Short-period Variables and Results from the first-year Survey

Contact Info

Product

Resources

About