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The BoRG-JWST Survey: Program Overview and First Confirmations of Luminous Reionization-Era Galaxies from Pure-Parallel Observations

We present the BoRG-JWST survey, a combination of two JWST Cycle 1 programs aimed at obtaining NIRSpec spectroscopy of representative, UV-bright $7<z<10$ galaxy candidates across 22 independent sight lines selected from Hubble/WFC3…

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Study of Integrated Far-ultraviolet Emissions from Galactic Globular Clusters using AstroSat/UVIT observations

We used observations obtained with the Ultraviolet Imaging Telescope on board the AstroSat satellite to measure the integrated far-ultraviolet (FUV) and optical (V) magnitudes of 30 Galactic globular clusters (GCs). We classified the…

Astrophysics of Galaxies · Physics 2026-03-31 Sonika Piridi , Ranjan Kumar , Divya Pandey , Ananta C. Pradhan

Identifying New $\gamma$-Ray Sources in All-Sky Surveys Based on Fermipy's Advanced Algorithm

We employ an efficient method for identifying gamma-ray sources across the entire sky, leveraging advanced algorithms from Fermi p y, and cleverly utilizing the Galactic diffuse background emission model to partition the entire sky into 72…

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Optical spectroscopic observations of gamma-ray blazar candidates III. The 2013/2014 campaign in the Southern Hemisphere

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High Energy Astrophysical Phenomena · Physics 2015-06-24 M. Landoni , F. Massaro , A. Paggi , R. D'Abrusco , D. Milisavljevic , N. Masetti , Howard. A. Smith , G. Tosti , L. Chomiuk , J. Strader , C. C. Cheung

A spatially resolved analysis of star-formation burstiness by comparing UV and H$\alpha$ in galaxies at z$\sim$1 with UVCANDELS

The UltraViolet imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) program provides HST/UVIS F275W imaging for four CANDELS fields. We combine this UV imaging with existing HST/near-IR grism…

Astrophysics of Galaxies · Physics 2023-08-02 Vihang Mehta , Harry I. Teplitz , Claudia Scarlata , Xin Wang , Anahita Alavi , James Colbert , Marc Rafelski , Norman Grogin , Anton Koekemoer , Laura Prichard , Rogier Windhorst , Justin M. Barber , Christopher J. Conselice , Y. Sophia Dai , Jonathan P. Gardner , Eric Gawiser , Yicheng Guo , Nimish Hathi , Pablo Arrabal Haro , Matthew Hayes , Kartheik G. Iyer , Rolf A. Jansen , Zhiyuan Ji , Peter Kurczynski , Maxwell Kuschel , Ray A. Lucas , Kameswara Mantha , Robert W. O'Connell , Swara Ravindranath , Brant E. Robertson , Michael Rutkowski , Brian Siana , L. Y. Aaron Yung

Faint far-infrared sources: Galaxies, clusters, or cluster galaxies

We present results from an on-going follow-up campaign of far-infrared sources detected as part of our ISOPHOT Cosmic IR Background project. Fields have been imaged in the optical and near-infrared, and we find at least a third of the FIR…

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The Unidentified Galactic EGRET Sources

The nature of the unidentified gamma-ray point sources in the galactic plane is a long standing puzzle of gamma-ray astronomy. Kaaret and Cottam (1996) showed that 16 of the 25 unidentified gamma-ray point sources near the galactic plane…

Astrophysics · Physics 2007-05-23 Philip Kaaret

A Targeted Search for Point Sources of EeV Neutrons

A flux of neutrons from an astrophysical source in the Galaxy can be detected in the Pierre Auger Observatory as an excess of cosmic-ray air showers arriving from the direction of the source. To avoid the statistical penalty for making many…

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A GALEX Ultraviolet Imaging Survey of Galaxies in the Local Volume

We present results from a GALEX ultraviolet (UV) survey of a complete sample of 390 galaxies within ~11 Mpc of the Milky Way. The UV data are a key component of the composite Local Volume Legacy (LVL), an ultraviolet-to-infrared imaging…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Janice C. Lee , Armando Gil de Paz , Robert C. Kennicutt, , Matthew Bothwell , Julianne Dalcanton , José G. Funes , S. J. , Benjamin Johnson , Shoko Sakai , Evan Skillman , Christy Tremonti , Liese van Zee

Using the Rosat Catalogue to find Counterparts for Unidentified Objects in the 1st Fermi/LAT Catalogue

There are a total of 1451 gamma-ray emitting objects in the Fermi Large Area Telescope First Source Catalogue. The point source location accuracy of typically a few arcminutes has allowed the counterparts for many of these sources to be…

High Energy Astrophysical Phenomena · Physics 2015-05-18 J. B. Stephen , L. Bassani , R. Landi , A. Malizia , V. Sguera , A. Bazzano , N. Masetti

A Multiwavelength Machine-learning Approach to Classifying X-ray Sources in the Fields of Unidentified 4FGL-DR4 sources

A large fraction of Fermi-Large Area Telescope (LAT) sources in the fourth Fermi-LAT 14 yr catalog (4FGL) still remain unidentified (unIDed). We continued to improve our machine-learning pipeline and used it to classify 1206 X-ray sources…

High Energy Astrophysical Phenomena · Physics 2024-08-20 Hui Yang , Jeremy Hare , Oleg Kargaltsev

A New Mask for An Old Suspect: Testing the Sensitivity of the Galactic Center Excess to the Point Source Mask

The Fermi-LAT collaboration has recently released a new point source catalog, referred to as 4FGL. For the first time, we perform a template fit using information from this new catalog and find that the Galactic center excess is still…

High Energy Astrophysical Phenomena · Physics 2020-07-01 Yi-Ming Zhong , Samuel D. McDermott , Ilias Cholis , Patrick J. Fox

Discovery of a New Quadruple Lens HST 1411+5211

Gravitational lensing is an important tool for probing the mass distribution of galaxies. In this letter we report the discovery of a new quadruple lens HST 1411+5211 found in archived WFPC2 images of the galaxy cluster CL140933+5226. If…

Astrophysics · Physics 2009-10-30 Philippe Fischer , David Schade , Felipe Barientos

Far infrared extragalactic background radiation: I. Source counts with ISOPHOT

As a part of the ISOPHOT CIRB (Cosmic Infrared Background Radiation) project we have searched for point-like sources in eight fields mapped at two or three wavelengths between 90 and 180um. Most sources are previously unknown and based on…

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Ultraviolet variability in Radio-Loud Active Galactic Nuclei observed by UVIT onboard AstroSat

Radio-loud active galactic nuclei (AGN) are among the most luminous objects in the Universe, emitting radiation from low-energy radio waves to high energy $\gamma$-rays. They are well known to exhibit flux variations at nearly all…

Astrophysics of Galaxies · Physics 2026-03-19 M. Reshma , C. S. Stalin , Amit Kumar Mandal , S. B. Gudennavar , Senorita Benedict , Prajwel Joseph

The Ultraviolet Deep Imaging Survey of Galaxies in the Bootes Void I: catalog, color-magnitude relations and star formation

We present a deep far and near-ultraviolet (FUV and NUV) wide-field imaging survey of galaxies in the Bootes Void using Ultra-Violet Imaging Telescope onboard {\em AstroSat}. Our data reach $5\sigma$ limiting magnitudes for point sources at…

Astrophysics of Galaxies · Physics 2021-10-04 Divya Pandey , Kanak Saha , Ananta C. Pradhan

The Far Ultraviolet Background

The diffuse far-ultraviolet (FUV) background has received considerable attention from astronomers since the 1970's. The initial impetus came from the hope of detecting UV radiation from the hot intergalactic medium. The central importance…

Astrophysics of Galaxies · Physics 2022-08-31 S. R. Kulkarni

GALEX Ultraviolet Photometry of Globular Clusters in M31

We present ultraviolet photometry for globular clusters (GCs) in M31 from 15 square deg of imaging using the Galaxy Evolution Explorer (GALEX). We detect 200 and 94 GCs with certainty in the near-ultraviolet (NUV; 1750 - 2750 Angstroms) and…

Astrophysics · Physics 2009-11-10 S. -C. Rey , R. M. Rich , Y. -W. Lee , S. -J. Yoon , S. K. Yi , L. Bianchi , Y. -J. Sohn , P. G. Friedman , T. A. Barlow , Y. -I. Byun , J. Donas , K. Forster , T. M. Heckman , M. J. Jee , P. N. Jelinsky , S. -W. Kim , J. -W. Lee , B. F. Madore , R. F. Malina , D. C. Martin , B. Milliard , P. Morrissey , S. G. Neff , J. Rhee , D. Schiminovich , O. H. W. Siegmund , T. Small , A. S. Szalay , B. Y. Welsh , T. K. Wyder

Unveiling a Population of Strong Galaxy-Galaxy Lensed Faint Dusty Star-Forming Galaxies

The measurements of the number density of galaxy-galaxy strong lenses can be used to put statistical constraints on the foreground mass distributions. Dusty galaxies uncovered in submillimeter surveys are particularly useful in this regard…

Astrophysics of Galaxies · Physics 2025-06-16 Ting-Kai Yang , Chian-Chou Chen , Zhen-Kai Gao , Bovornpratch Vijarnwannaluk , Adarsh Ranjan , Wei-Hao Wang , Caitlin M. Casey , Tomotsugu Goto , Jeyhan S. Kartaltepe , Chayan Mondal , James Pearson , Chris Sedgwick , Stephen Serjeant

Finding the brightest cosmic beacons in the Southern Hemisphere

The study of absorptions along the lines of sight to bright high-$z$ QSOs is an invaluable cosmological tool that provides a wealth of information on the inter-/circum-galactic medium, Dark Matter, primordial elements, reionization,…

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