The covering factor of warm dust in quasars: a view from the Wide-field Infrared Survey Explorer All-Sky Data Release

Abstract I have used high-precision photometry and astrometry from the early installment of the third data release of Gaia (EDR3) to perform a survey for members of the stellar populations within the Sco-Cen complex, which consist of Upper Sco, UCL/LCC, the V1062 Sco group, Ophiuchus, and Lupus. Among Gaia sources with σ π < 1 mas, I have identified 10,509 candidate members of those populations. I have compiled previous measurements of spectral types, Li equivalent widths, and radial velocities for the candidates, which are available for 3169, 1420, and 1740 objects, respectively. In a subset of candidates selected to minimize field star contamination, I estimate that the contamination is ≲1% and the completeness is ∼90% at spectral types of ≲M6–M7 for the populations with low extinction (Upper Sco, V1062 Sco, UCL/LCC). I have used that cleaner sample to characterize the stellar populations in Sco-Cen in terms of their initial mass functions, ages, and space velocities. For instance, all of the populations in Sco-Cen have histograms of spectral types that peak near M4–M5, which indicates that they share similar characteristic masses for their initial mass functions (∼0.15–0.2 M ⊙). After accounting for incompleteness, I estimate that the Sco-Cen complex contains nearly 10,000 members with masses above ∼0.01 M ⊙. Finally, I also present new estimates for the intrinsic colors of young stars and brown dwarfs (≲20 Myr) in bands from Gaia EDR3, the Two Micron All Sky Survey, the Wide-field Infrared Survey Explorer, and the Spitzer Space Telescope.

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Extinction-free Census of AGNs in the AKARI/IRC North Ecliptic Pole Field from 23-band infrared photometry from Space Telescopes

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/staa2988 ◽

2020 ◽

Vol 499 (3) ◽

pp. 4068-4081 ◽

Cited By ~ 1

Author(s):

Ting-Wen Wang ◽

Tomotsugu Goto ◽

Seong Jin Kim ◽

Tetsuya Hashimoto ◽

Denis Burgarella ◽

...

Keyword(s):

Spectral Energy Distribution ◽

Cosmic Time ◽

Spectral Energy ◽

Wide Field ◽

Space Telescopes ◽

Distribution Modelling ◽

Star Forming ◽

The North ◽

Band Filter ◽

Infrared Survey

ABSTRACT In order to understand the interaction between the central black hole and the whole galaxy or their co-evolution history along with cosmic time, a complete census of active galactic nucleus (AGN) is crucial. However, AGNs are often missed in optical, UV, and soft X-ray observations since they could be obscured by gas and dust. A mid-infrared (MIR) survey supported by multiwavelength data is one of the best ways to find obscured AGN activities because it suffers less from extinction. Previous large IR photometric surveys, e.g. Wide field Infrared Survey Explorer and Spitzer, have gaps between the MIR filters. Therefore, star-forming galaxy-AGN diagnostics in the MIR were limited. The AKARI satellite has a unique continuous nine-band filter coverage in the near to MIR wavelengths. In this work, we take advantage of the state-of-the-art spectral energy distribution modelling software, cigale, to find AGNs in MIR. We found 126 AGNs in the North Ecliptic Pole-Wide field with this method. We also investigate the energy released from the AGN as a fraction of the total IR luminosity of a galaxy. We found that the AGN contribution is larger at higher redshifts for a given IR luminosity. With the upcoming deep IR surveys, e.g. JWST, we expect to find more AGNs with our method.

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Detection and correlation of geosynchronous objects in NASA’s Wide-field Infrared Survey Explorer images

Acta Astronautica ◽

10.1016/j.actaastro.2021.03.009 ◽

2021 ◽

Author(s):

Joshua Fitzmaurice ◽

Donald Bédard ◽

Chris H. Lee ◽

Patrick Seitzer

Keyword(s):

Wide Field ◽

Infrared Survey

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Wide-Field InfraRed Survey Telescope (WFIRST) Mission and Synergies with LISA and LIGO-Virgo

Journal of Physics Conference Series ◽

10.1088/1742-6596/610/1/012007 ◽

2015 ◽

Vol 610 ◽

pp. 012007 ◽

Cited By ~ 16

Author(s):

N Gehrels ◽

D Spergel ◽

Keyword(s):

Wide Field ◽

Infrared Survey

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Challenges in Timeseries Analysis from Microlensing

Proceedings of the International Astronomical Union ◽

10.1017/s1743921316012886 ◽

2016 ◽

Vol 12 (S325) ◽

pp. 253-258

Author(s):

R. A. Street

Keyword(s):

Data Analysis ◽

Software Development ◽

Formation Mechanisms ◽

Wide Field ◽

Detection Techniques ◽

Timeseries Analysis ◽

Modeling Software ◽

New Software Development ◽

Host Stars ◽

Infrared Survey

AbstractDespite a flood of discoveries over the last ~ 20 years, our knowledge of the exoplanet population is incomplete owing to a gap between the sensitivities of different detection techniques. However, a census of exoplanets at all separations from their host stars is essential to fully understand planet formation mechanisms. Microlensing offers an effective way to bridge the gap around 1–10 AU and is therefore one of the major science goals of the Wide Field Infrared Survey Telescope (WFIRST) mission. WFIRST’s survey of the Galactic Bulge is expected to discover ~ 20,000 microlensing events, including ~ 3000 planets, which represents a substantial data analysis challenge with the modeling software currently available. This paper highlights areas where further work is needed. The community is encouraged to join new software development efforts aimed at making the modeling of microlensing events both more accessible and rigorous.

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H i galaxies with little star formation: an abundance of LIERs

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/stz593 ◽

2019 ◽

Vol 485 (3) ◽

pp. 3169-3184 ◽

Cited By ~ 6

Author(s):

Vaishali Parkash ◽

Michael J I Brown ◽

T H Jarrett ◽

A Fraser-McKelvie ◽

M E Cluver

Keyword(s):

Star Formation ◽

Emission Line ◽

Central Star ◽

Wide Field ◽

Dark Energy Survey ◽

Sky Survey ◽

Low Levels ◽

Field Unit ◽

Energy Survey ◽

Infrared Survey

Abstract We present a sample of 91 H i galaxies with little or no star formation, and discuss the analysis of the integral field unit (IFU) spectra of 28 of these galaxies. We identified H i galaxies from the H i Parkes All-Sky Survey Catalog (HICAT) with Wide-field Infrared Survey Explorer (WISE) colours consistent with low specific star formation (<10−10.4 yr−1), and obtained optical IFU spectra with the Wide-Field Spectrograph (WiFeS). Visual inspection of the PanSTARRS, Dark Energy Survey, and Carnegie-Irvine imaging of 62 galaxies reveals that at least 32 galaxies in the sample have low levels of star formation, primarily in arms/rings. New IFU spectra of 28 of these galaxies reveals 3 galaxies with central star formation, 1 galaxy with low-ionization nuclear emission-line regions (LINERs), 20 with extended low-ionization emission-line regions (LIERs), and 4 with high excitation Seyfert (Sy) emission. From the spectroscopic analysis of H i selected galaxies with little star formation, we conclude that 75 per cent of this population are LINERs/LIERs.

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Optical characterization of WISE selected blazar candidates

Astronomy and Astrophysics ◽

10.1051/0004-6361/201936195 ◽

2019 ◽

Vol 630 ◽

pp. A55 ◽

Cited By ~ 8

Author(s):

Raniere de Menezes ◽

Harold A. Peña-Herazo ◽

Ezequiel J. Marchesini ◽

Raffaele D’Abrusco ◽

Nicola Masetti ◽

...

Keyword(s):

Gamma Ray ◽

Optical Spectra ◽

Sloan Digital Sky Survey ◽

Wide Field ◽

Large Area ◽

Bl Lac Objects ◽

True Nature ◽

Normal Galaxies ◽

Data Release ◽

The Impact

Context. Over the last decade more than five thousand γ-ray sources have been detected by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope. Given the positional uncertainty of the telescope, nearly 30% of these sources remain without an obvious counterpart at lower energies. This has motivated the release of new catalogs of γ-ray counterpart candidates and several follow up campaigns in the last decade. Aims. Recently, two new catalogs of blazar candidates were released. These are the improved and expanded version of the WISE Blazar-Like Radio-Loud Sources (WIBRaLS2) catalog and the Kernel Density Estimation selected candidate BL Lacs (KDEBLLACS) catalog, both selecting blazar-like sources based on their infrared colors from the Wide-field Infrared Survey Explorer (WISE). In this work we characterize these two catalogs, clarifying the true nature of their sources based on their optical spectra from SDSS data release 15, thus testing their efficiency in selecting true blazars. Methods. We first selected all WIBRaLS2 and KDEBLLACS sources with available optical spectra in the footprint of Sloan Digital Sky Survey data release 15. We then analyzed these spectra to verify the nature of each selected candidate and to measure the fraction of the catalogs composed by spectroscopically confirmed blazars. Finally, we evaluated the impact of selection effects, especially those related to optical colors of WIBRaLS2/KDEBLLACS sources and their optical magnitude distributions. Results. We found that at least ∼30% of each catalog is made up of confirmed blazars, with quasars being the major contaminants in the case of WIBRaLS2 (≈58%) and normal galaxies in the case of KDEBLLACS (≈38.2%). The spectral analysis also allowed us to identify the nature of 11 blazar candidates of uncertain type (BCUs) from the Fermi-LAT fourth Point Source Catalog (4FGL) and to find 25 new BL Lac objects.

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Cryogenic telescope, scanner, and imaging optics for the wide-field infrared survey explorer (WISE)

10.1117/12.617653 ◽

2005 ◽

Author(s):

Mark Schwalm ◽

Mark Barry ◽

Gerry Perron ◽

Deepak Sampath ◽

Fran LaMalva ◽

...

Keyword(s):

Wide Field ◽

Infrared Survey ◽

Imaging Optics

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WISE data and sparse photometry used for shape reconstruction of asteroids

Proceedings of the International Astronomical Union ◽

10.1017/s1743921315008492 ◽

2015 ◽

Vol 10 (S318) ◽

pp. 170-176 ◽

Cited By ~ 1

Author(s):

Josef Ďurech ◽

Josef Hanuš ◽

Victor M. Alí-Lagoa ◽

Marco Delbo ◽

Dagmara A. Oszkiewicz

Keyword(s):

Rotation Period ◽

Shape Reconstruction ◽

Physical Models ◽

Inversion Method ◽

Wide Field ◽

Reflected Light ◽

Space Data ◽

Spin Determination ◽

Infrared Survey

AbstractAsteroid disk-integrated sparse-in-time photometry can be used for determination of shapes and spin states of asteroids by the lightcurve inversion method. To clearly distinguish the correct solution of the rotation period from other minima in the parameter space, data with good photometric accuracy are needed. We show that if the low-quality sparse photometry obtained from ground-based astrometric surveys is combined with data from the Wide-field Infrared Survey Explorer (WISE) satellite, the correct rotation period can be successfully derived. Although WISE observed in mid-IR wavelengths, we show that for the period and spin determination, these data can be modelled as reflected light. The absolute fluxes are not required since only relative variation of the flux over the rotation is sufficient to determine the period. We also discuss the potential of combining all WISE data with the Lowell photometric database to create physical models of thousands of asteroids.

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