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We introduce a new Bayesian HI spectral line fitting technique capable of obtaining spectroscopic redshifts for millions of galaxies in radio surveys with the Square Kilometere Array (SKA). This technique is especially well-suited to the…

宇宙学与河外天体物理 · 物理学 2017-04-28 Ian Harrison , Michelle Lochner , Michael L. Brown

We have developed a general data reduction technique for ISOCAM data coming from various deep surveys of faint galaxies. In order to reach the fundamental limits of the camera (due to the background photon noise and the readout noise), we…

天体物理学 · 物理学 2007-05-23 F. -X. Desert , J. -L. Puget , D. L. Clements , M. Perault , A. Abergel , J-P. Bernard , C. J. Cesarsky

Cosmological applications of HII galaxies (HIIGx) and giant extragalactic HII regions (GEHR) to construct the Hubble diagram at higher redshifts require knowledge of the "$L$--$\sigma$" relation of the standard candles used. In this paper,…

宇宙学与河外天体物理 · 物理学 2020-01-29 Yan Wu , Shuo Cao , Jia Zhang , Tonghua Liu , Yuting Liu , Shuaibo Geng , Yujie Lian

We stack Spitzer 24 micron images for ~7000 galaxies with 0.1<z<1 in the Chandra Deep Field South to probe the thermal dust emission in low-luminosity galaxies over this redshift range. Through stacking, we can detect mean 24 micron fluxes…

天体物理学 · 物理学 2009-11-13 X. Z. Zheng , E. F. Bell , H. -W. Rix , C. Papovich , E. Le Floc'h , G. H. Rieke , P. G. Pérez-González

We present STARRED, a Point Spread Function (PSF) reconstruction, two-channel deconvolution, and light curve extraction method designed for high-precision photometric measurements in imaging time series. An improved resolution of the data…

天体物理仪器与方法 · 物理学 2024-07-25 Martin Millon , Kevin Michalewicz , Frédéric Dux , Frédéric Courbin , Philip J. Marshall

We describe a new approach to studying the intergalactic and circumgalactic medium in the local Universe: direct detection through narrow-band imaging of ultra-low surface brightness visible-wavelength line emission. We use the…

星系天体物理 · 物理学 2019-05-29 Deborah Lokhorst , Roberto Abraham , Pieter van Dokkum , Nastasha Wijers , Joop Schaye

Understanding the properties of interstellar turbulence is a great intellectual challenge and the urge to solve this problem is partially motivated by a necessity to explain the star formation mystery. This review deals with a recently…

天体物理学 · 物理学 2007-05-23 A. Lazarian

Obtaining accurately calibrated redshift distributions of photometric samples is one of the great challenges in photometric surveys like LSST, Euclid, HSC, KiDS, and DES. We present an inference methodology that combines the redshift…

宇宙学与河外天体物理 · 物理学 2021-12-09 M. M. Rau , C. B. Morrison , S. J. Schmidt , S. Wilson , R. Mandelbaum , Y. Y. Mao

We present a Bayesian Stacking technique to directly measure the HI mass function (HIMF) and its evolution with redshift using galaxies formally below the nominal detection threshold. We generate galaxy samples over several sky areas given…

We present the first results from the Faint Infra-Red Extragalactic Survey (FIRES) of the Hubble Deep Field South. Using a combination of deep near infrared data obtained with ISAAC at the VLT with the WFPC2 HST data, we construct a K-band…

We provide measurements of the integrated galaxy light at 70, 160, 250, 350 and 500 micron using deep far-infrared and submillimeter data from space (Spitzer) and balloon platform (BLAST) extragalactic surveys. We use the technique of…

宇宙学与河外天体物理 · 物理学 2010-03-10 Ranga-Ram Chary , Alexandra Pope

We present HI 21 cm spectroscopy from the GBT for the host galaxies of 31 nearby AGNs with direct M$_{\textrm{BH}}$ measurements from reverberation mapping. These are the first published HI detections for 12 galaxies, and the spectral…

星系天体物理 · 物理学 2019-07-31 Justin H. Robinson , Misty C. Bentz , Megan C. Johnson , Hélène M. Courtois , Benjamin Ou-Yang

Reverberation mapping offers one of the best techniques for studying the inner regions of QSOs. It is based on cross-correlating continuum and emission-line light curves. New time-resolved optical surveys will produce well sampled light…

宇宙学与河外天体物理 · 物理学 2015-06-05 S. Fine , T. Shanks , S. M. Croom , P. Green , B. C. Kelly , E. Berge , R. Chornock , W. S. Burgett , E. A. Magnier , P. A. Price

We present the results of a set of mock experiments aimed at quantifying the accuracy of results derived from HI spectral line stacking experiments. We focus on the effects of spatial and spectral aperture sizes and redshift uncertainties…

星系天体物理 · 物理学 2019-05-08 E. C. Elson , A. J. Baker , S. L. Blyth

Bolton and Schlegel presented a promising deconvolution method to extract 1D spectra from a 2D optical fiber spectral CCD image. The method could eliminate the PSF difference between fibers, extract spectra to the photo noise level, as well…

天体物理仪器与方法 · 物理学 2015-06-24 Guangwei Li , Haotong Zhang , Zhongrui Bai

We explore the relationship between dust-emission derived reddening \EBV\ and atomic hydrogen column density N(H I) derived from 21 cm emission surveys. We consider measurements at galactic latitude $|b| \ga 20$\degr\ and \EBV\ $\la$ 0.1…

星系天体物理 · 物理学 2015-06-17 H. S. Liszt

We present a Bayesian reconstruction method which maps a galaxy distribution from redshift-space to real-space inferring the distances of the individual galaxies. The method is based on sampling density fields assuming a lognormal prior…

We introduce a new stacking method in Keplerian disks that (1) enhances signal-to-noise ratios (S/N) of detected molecular lines and (2) that makes visible otherwise undetectable weak lines. Our technique takes advantage of the Keplerian…

太阳与恒星天体物理 · 物理学 2016-12-14 Hsi-Wei Yen , Patrick M. Koch , Hauyu Baobab Liu , Evaria Puspitaningrum , Naomi Hirano , Chin-Fei Lee , Shigehisa Takakuwa

The distribution of atomic hydrogen in the Galactic plane is usually mapped using the Doppler shift of 21cm emission line. We calculate the emission spectrum in velocity slices of data (channel maps) and derive its dependence on the…

天体物理学 · 物理学 2009-10-31 A. Lazarian , D. Pogosyan

This paper introduces the data cubes from GHIGLS, deep Green Bank Telescope surveys of the 21-cm line emission of HI in 37 targeted fields at intermediate Galactic latitude. The GHIGLS fields together cover over 1000 square degrees at 9.55'…