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UV observations in the local universe have uncovered a population of early-type galaxies with UV flux consistent with low-level recent or ongoing star formation. We present resolved UV-optical photometry of a sample of 19 SDSS early-type…

Cosmology and Nongalactic Astrophysics · Physics 2012-11-22 Jerome J. Fang , S. M. Faber , Samir Salim , Genevieve J. Graves , R. Michael Rich

We present the results of a 8.4 GHz Very Large Array radio survey of early-type galaxies extracted from the ACS Virgo Cluster Survey. The aim of this survey is to investigate the origin of radio emission in early-type galaxies and its link…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 Alessandro Capetti , Preeti Kharb , David J. Axon , David Merritt , Ranieri D. Baldi

The radio continuum spectra of 14 star-forming galaxies are investigated by fitting nonthermal (synchrotron) and thermal (free-free) radiation laws. The underlying radio continuum measurements cover a frequency range of ~325 MHz to 24.5 GHz…

Astrophysics of Galaxies · Physics 2018-03-28 Uli Klein , Ute Lisenfeld , Simon Verley

Measuring star formation rates (SFRs) in high-z galaxies with their rest-frame ultraviolet (UV) continuum can be uncertain because of dust obscuration. Prior studies had used the submillimeter emission at 850 um to determine the intrinsic…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 I-Ting Ho , Wei-Hao Wang , Glenn E. Morrison , Neal A. Miller

We measure the obscured star formation in z~1 early-type galaxies. This constrains the influence of star formation on their optical/near-IR colors, which, we found, are redder than predicted by the model by Bruzual & Charlot (2003). From…

Astrophysics · Physics 2009-06-23 A. van der Wel , M. Franx , G. D. Illingworth , P. G. van Dokkum

We study the radio - far-infrared (FIR) correlation in a sample of faint dwarf irregular galaxies using NVSS data for 1.4 GHz radio flux, Spitzer MIPS 70 um data for FIR flux, and GALEX FUV data to estimate the star formation rates (SFR).…

Cosmology and Nongalactic Astrophysics · Physics 2014-09-04 Sambit Roychowdhury , Jayaram N. Chengalur

Using the Alternative Data Release of the TIFR GMRT Sky Survey (TGSS), we studied the low-frequency properties of FR0 radio galaxies, the large population of compact radio sources associated with red massive early-type galaxies revealed by…

Astrophysics of Galaxies · Physics 2019-11-20 Alessandro Capetti , Ranieri D. Baldi , Marisa Brienza , Raffaella Morganti , Gabriele Giovannini

Radio wavelengths offer a unique possibility to trace the total star-formation rate (SFR) in galaxies, both obscured and unobscured. To probe the dust-unbiased star-formation history, an accurate measurement of the radio luminosity function…

Astrophysics of Galaxies · Physics 2024-01-23 Wenjie Wang , Zunli Yuan , Hongwei Yu , Jirong Mao

Radio observations provide a powerful tool to constrain the assembly of galaxies over cosmic time. Recent deep and wide radio continuum surveys have improved significantly our understanding on radio emission properties of AGNs and SFGs…

Astrophysics of Galaxies · Physics 2025-02-19 Fangyou Gao , Tao Wang , Yijun Wang

We studied the radio properties of very young massive regions of star formation in HII galaxies, with the aim of detecting episodes of recent star formation in an early phase of evolution where the first supernovae start to appear. The…

Cosmology and Nongalactic Astrophysics · Physics 2009-03-04 Daniel Rosa-Gonzalez , Henrique Schmitt , Elena Terlevich , Roberto Terlevich

We present a study of the star formation properties of a sample of emission line galaxies (ELGs) with respect to their environment. This study is part of a bigger project that aimed to find galaxies in voids and to investigate the large…

Astrophysics · Physics 2007-05-23 Cristina C. Popescu , Ulrich Hopp , Michael R. Rosa

Dwarf galaxies, due to their shallow gravitational potentials, provide critical environments for studying feedback mechanisms from star formation and its impacts on dwarf galaxy evolution. In particular, radio continuum (RC) observations…

We present results of our 1.4 GHz image stacking analysis of mass-selected galaxies in the COSMOS field. From the resulting median radio continuum flux density we have determined the evolution of the average star formation rate (SFR) of…

Cosmology and Nongalactic Astrophysics · Physics 2011-02-09 Alexander Karim , Eva Schinnerer , the VLA-COSMOS , COSMOS collaborations

We derive direct measurement gas-phase metallicities of $7.4 < 12 + \log(O/H) < 8.4$ for 14 low-mass Emission Line Galaxies (ELGs) at $0.3 < z < 0.8$ identified in the Faint Infrared Grism Survey (FIGS). We use deep slitless G102 grism…

We study the properties of star-forming galaxies selected at 610 MHz with the GMRT in a survey covering $\sim$1.86 deg$^2$ down to a noise of $\sim$7.1\,$\mu$Jy / beam. These were identified by combining multiple classification diagnostics:…

Astrophysics of Galaxies · Physics 2020-01-08 E. F. Ocran , A. R. Taylor , M. Vaccari , C. H. Ishwara-Chandra , I. Prandoni , M. Prescott , C. Mancuso

The evolution in the comoving space density of the global average galaxy star formation rate (SFR) out to a redshift around unity is well established. Beyond z~1 there is growing evidence that this evolution is flat or even increasing,…

Astrophysics · Physics 2008-11-26 A. M. Hopkins

We take advantage of gravitational lensing amplification by Abell 1689 (z=0.187) to undertake the first space-based census of emission line galaxies (ELGs) in the field of a massive lensing cluster. Forty-three ELGs are identified to a flux…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-05 Brenda L. Frye , Mairead Hurley , David. V. Bowen , Gerhardt Meurer , Keren Sharon , Amber Straughn , Dan Coe , Tom Broadhurst , Puragra Guhathakurta

We detect and study the properties of faint radio AGN in Luminous Red Galaxies (LRGs). The LRG sample comprises 760,000 objects from a catalog of LRG photometric redshifts constructed from the Sloan Digital Sky Survey (SDSS) imaging data,…

Astrophysics of Galaxies · Physics 2015-05-13 J. A. Hodge , G. R. Zeimann , R. H. Becker , R. L. White

We present a study of the submillimeter (submm) emission of Distant Red Galaxies (DRGs). The DRGs are selected by the criterion (J-K)>2.3, and are generally massive galaxies at redshifts higher than 2, with red rest-frame optical colors.…

We present the star formation rate (SFR) measurements based on the spectral energy distribution (SED) analysis with new sub-mm fluxes combined with archival multi-wavelength data for a sample of 52 AGN host galaxies at z $<0.2$. We carried…