Star Formation in NGC5194 (M51a): The Panchromatic View from GALEX to Spitzer

Abstract

(Abridged) Far ultraviolet to far infrared images of the nearby galaxy NGC5194, from Spitzer, GALEX, Hubble Space Telescope and ground--based data, are used to investigate local and global star formation, and the impact of dust extinction in HII-emitting knots. In the IR/UV-UV color plane, the NGC5194 HII knots show the same trend observed for normal star-forming galaxies, having a much larger dispersion than starburst galaxies. We identify the dispersion as due to the UV emission predominantly tracing the evolved, non-ionizing stellar population, up to ages 50-100 Myr. While in starbursts the UV light traces the current SFR, in NGC5194 it traces a combination of current and recent-past SFR. Unlike the UV emission, the monochromatic 24 micron luminosity is an accurate local SFR tracer for the HII knots in NGC5194; this suggests that the 24 micron emission carriers are mainly heated by the young, ionizing stars. However, preliminary results show that the ratio of the 24 micron emission to the SFR varies by a factor of a few from galaxy to galaxy. While also correlated with star formation, the 8 micron emission is not directly proportional to the number of ionizing photons. This confirms earlier suggestions that the carriers of the 8 micron emission are heated by more than one mechanism.

66 pages, 20 figures (Figures 1-4 are in JPEG format, figures 5-20 are embedded postscript files). Accepted for publication on the Astrophysical Journal

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• The JCMT Nearby Galaxies Legacy Survey VI: The distribution of gas and star formation in M81
• A Method to Extract Spatially Resolved Polycyclic Aromatic Hydrocarbon Emission from Spitzer Spectra: Application to M51
• A study of the star forming regions in the spiral galaxy NGC 2336 using the Ultraviolet Imaging Telescope (UVIT)
• Molecular Gas and Star Formation Properties in the Central and Bar Regions of NGC 6946
• Ages and Masses of Star Clusters in M33: a Multi-wavelength Study
• ACA CO($J=2-1$) Mapping of the Nearest Spiral Galaxy M33. I. Initial Results and Identification of Molecular Clouds
• Near-identical star formation rate densities from H$\alpha$ and FUV at redshift zero
• A Cautionary Tale of Attenuation in Star Forming Regions
• High-Mass X-ray Binaries and the Spiral Structure of the Host Galaxy
• Study of star formation in NGC 1084
• Investigating the ultraviolet and infrared radiation through the turbulent life of molecular clouds
• Mid and Far-Infrared Color-Color Relations within Local Galaxies
• Mapping the Spatial Distribution of Dust Extinction in NGC 959 Using Broadband Visible and mid-IR Filters
• Infrared dust emission in the outer disk of M51
• An X-ray View of Star Formation in the Central 3 kpc of NGC 2403
• The spatially-resolved correlation between [NII] 205 μm line emission and the 24 μm continuum in nearby galaxies
• Panchromatic Spectral Energy Distributions of simulated galaxies: results at redshift $z=0$
• Molecular Line Ratio Diagnostics Along the Radial Cut and Dusty UV-bright Clumps in a Spiral Galaxy NGC 0628
• The Opacity of Spiral Galaxy Disks IX; Dust and Gas Surface Densities
• Polycyclic aromatic hydrocarbon excitation in nearby spiral galaxies
• Physical Properties of H II Regions in M51 from Spectroscopic Observations
• Gas-dust correlations in nearby galaxies: a case study of NGC 3184 and NGC 7793
• Probing the magnetic field of the nearby galaxy pair Arp 269
• Large Misalignment between Stellar Bar and Dust Pattern in NGC 3488 Revealed by Spitzer and SDSS
• Spectral Modeling of Charge Exchange in the Central Region of M51
• Star formation in the centre of NGC 1808 as observed by ALMA
• Discovery of a radio nebula around PSR J0855-4644
• Scaling Relations between Gas and Star Formation in Nearby Galaxies
• Kinematics of M51-type interacting galaxies
• Far-Infrared and submillimeter properties of SDSS galaxies in the Herschel ATLAS science demonstration phase field
• Water Masers in the Andromeda Galaxy: II. Where Do Masers Arise?
• HI in Arp72 and similarities with M51-type systems
• Environmental Dependence of Star Formation Law in the Disk and Center of IC 342
• Comparing Infrared Star-Formation Rate Indicators with Optically-Derived Quantities
• X-ray Spectroscopic Evidence of Charge Exchange Emission in the Disk of M51
• Deriving the intrinsic properties of M51 with radiative transfer models
• Disentangling emission from star-forming regions in the Magellanic Clouds: Linking [OIII]88 micron and 24 micron
• Star Formation Rate Indicators in Wide-Field Infrared Survey Preliminary Release
• A Cosmic Relation between Extinction and Star Formation
• Dust Properties of Clumpy Disc Galaxies at z~1.3 with Herschel-SPIRE
• The HI dominated Low Surface Brightness Galaxy KKR17
• UV/Optical/IR Color Sequences Along the Tidal Ring/Arm of Arp 107
• The discrepancy in the mid-infrared continuum and the features of polycyclic aromatic hydrocarbons for Spitzer and Herschel SWIRE-field galaxies
• Analysis of the Intrinsic Mid-Infrared L-band to Visible--Near-Infrared Flux Ratios in Spectral Synthesis Models of Composite Stellar Populations
• The Star Formation History of Redshift z~2 Galaxies: The Role of The Infrared Prior
• Comparison of Diffuse Infrared and Far-Ultraviolet emission in the Large Magellanic Cloud: The Data
• Density effect on multi-wavelength luminosities on star formation regions in NGC 3184 and NGC 3938
• Dust properties and distribution in dwarf galaxies
• Telescopes versus Microscopes: the puzzle of Iron-60
• Correlations of gas, dust and young stellar populations in the spiral galaxy NGC 7331
• Pa$\beta$, H$\alpha$, and Attenuation in NGC 5194 and NGC 6946
• Star Formation Properties in Barred Galaxies (SFB). II. NGC 2903 and NGC 7080