# LOW-FREQUENCY RADIO-FIR CORRELATION IN NORMAL GALAXIES AT ∼1 kpc SCALES

@article{Basu2012LOWFREQUENCYRC,
title={LOW-FREQUENCY RADIO-FIR CORRELATION IN NORMAL GALAXIES AT ∼1 kpc SCALES},
author={Aritra Basu and Subhashis Roy and Dipanjan Mitra},
journal={The Astrophysical Journal},
year={2012},
volume={756},
pages={141}
}
• Published 2012
• Physics
• The Astrophysical Journal
We study the radio-FIR correlation between the nonthermal (synchrotron) radio continuum emission at λ90 cm (333 MHz) and the far-infrared emission due to cool (~20 K) dust at λ70 μm in spatially resolved normal galaxies at scales of ~1 kpc. The slope of the radio-FIR correlation significantly differs between the arm and interarm regions. However, this change is not evident at a lower wavelength of λ20 cm (1.4 GHz). We find the slope of the correlation in the arm to be 0.8 ± 0.12 and we use this… Expand

#### Figures and Tables from this paper

A new interpretation of the far-infrared – radio correlation and the expected breakdown at high redshift
• Physics
• 2013
Context. Observations of galaxies up to z � 2 show a tight correlation between far-infrared and radio continuum emission, suggesting a relation between star formation activity and magnetic fields inExpand
Tracing cool molecular gas and star formation on ∼100 pc scales within a z ∼ 2.3 galaxy
• Physics
• 2015
We present new, high-angular resolution interferometric observations with the Karl G. Jansky Very Large Array of 12CO J = 1−0 line emission and 4–8 GHz continuum emission in the strongly lensed, z =Expand
The LOFAR window on star-forming galaxies and AGNs - curved radio SEDs and IR-radio correlation at 0
We present a study of the low-frequency radio properties of star-forming (SF) galaxies and active galactic nuclei (AGNs) up to redshift z = 2.5. The new spectral window probed by the Low FrequencyExpand
Radio--Far infrared correlation in "blue cloud" galaxies with 0
We study the radio--far infrared (FIR) correlation in "blue cloud" galaxies chosen from the PRism MUltiobject Survey (PRIMUS) up to redshift ($z$) of 1.2 in the XMM-LSS field. We use rest-frameExpand
How cosmic ray electron propagation affects radio-far-infrared correlations in M 31 and M 33
• Physics
• 2013
We investigate the effect of propagation of cosmic-ray electrons (CRE) on the nonthermal (synchrotron) - far-infrared correlations in M31 and M33. The thermal (TH) and nonthermal (NTH) emissionExpand
CHANG-ES X: Spatially-resolved Separation of Thermal Contribution from Radio Continuum Emission in Edge-on Galaxies
We analyze the application of star formation rate (SFR) calibrations using H$\alpha$ and 22 micron infrared imaging data in predicting the thermal radio component for a test sample of 3 edge-onExpand
Magnetic fields in the nearby spiral galaxy IC 342: A multi-frequency radio polarization study
The total and polarized radio continuum emission of IC 342 was observed in four wavelength bands with the Effelsberg and VLA telescopes. The frequency dependence of the radial scalelength ofExpand
The nature of the low-frequency emission of M 51 First observations of a nearby galaxy with LOFAR
Context. Low frequency radio continuum observations (<300 MHz) can provide valuable information propagation loss energy cosmic ray electrons (CRE). Nearby spiral galaxies have hardly been studied inExpand
New insights into the interstellar medium of the dwarf galaxy IC 10 : connection between magnetic fields, the radio--infrared correlation and star formation
We present the highest sensitivity and angular resolution study at 0.32 GHz of the dwarf irregular galaxy IC\,10, observed using the Giant Metrewave Radio Telescope, probing $\sim45$ pc spatialExpand
Tracking Galaxy Evolution Through Low-Frequency Radio Continuum Observations using SKA and Citizen-Science Research using Multi-Wavelength Data
We present a brief review of progress in the understanding of general spiral and elliptical galaxies, through merger, star formation and AGN activities. With reference to case studies performed withExpand

#### References

SHOWING 1-10 OF 45 REFERENCES
A multiresolution analysis of the radio-FIR correlation in the Large Magellanic Cloud
We investigate the local correlation between the 1.4-GHz radio continuum and 60-μm far-infrared (FIR) emission within the Large Magellanic Cloud (LMC) on spatial scales between 0.05 and 1.5 kpc. OnExpand
Thermal and non-thermal components of the interstellar medium at sub-kiloparsec scales in galaxies
Aims. We present new radio continuum observations of ten BIMA SONG galaxies, taken at 1.4 GHz with the Very Large Array. These observations allow us to extend the study of the relationships betweenExpand
New results on the radio-far-infrared relation for galaxies
• Physics
• 1992
The radio-FIR relation has been decomposed into thermal bremsstrahlung-FIR and synchrotron-FIR relation for a sample of 31 galaxies. Both radio emission components are tightly correlated with the FIRExpand
High-resolution radio continuum survey of M 33 - II. Thermal and nonthermal emission
Context. Constraints on the origin and propagation of cosmic rays can be achieved by studying the variation in the spectral index of the synchrotron emission across external galaxies. Aims. WeExpand
The Local Radio-IR Relation in M51
• Physics
• 2011
We observed M51 at three frequencies, 1.4 GHz (20 cm), 4.9 GHz (6 cm), and 8.4 GHz (3.6 cm), with the Very Large Array and the Effelsberg 100 m telescope to obtain the highest quality radio continuumExpand
A physical model of the infrared-to-radio correlation in galaxies
• Physics
• 1993
We explore the implications of the IR-radio correlation in star-forming galaxies, using a simple physical model constrained by the constant global ratio q of IR to radio emission and by the radialExpand
Thermal infrared and nonthermal radio: remarkable correlation in disks of galaxies
• Physics
• 1985
A tight, linear correlation is established between the far-infrared flux measured by IRAS and the nonthermal radio flux density (at 1.4 GHz) from disks of spiral galaxies. This correlation defines aExpand
Magnetic Fields in Starburst Galaxies and the Origin of the FIR-Radio Correlation
We estimate minimum energy magnetic fields (Bmin) for a sample of galaxies with measured gas surface densities, spanning more than four orders of magnitude in surface density, from normal spirals toExpand
GMRT 333‐MHz observations of six nearby normal galaxies
• Physics
• 2011
We report Giant Metrewave Radio Telescope (GMRT) continuum observations of six nearby normal galaxies at 333 MHz. The galaxies are observed with angular resolutions better than ∼20  arcsecExpand
A multi-scale study of infrared and radio emission from Scd galaxy M 33
Aims. We investigate the energy sources of the infrared (IR) emission and their relation to the radio continuum emission at various spatial scales within the Scd galaxy M 33. Methods. We use the dataExpand