Radio Properties of Infrared‐Selected Galaxies in the<i>IRAS</i>2 Jy Sample

Yun, Min S.; Reddy, Naveen A.; Condon, J. J.

doi:10.1086/323145

Cited by 908 publications

(1,740 citation statements)

References 107 publications

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“…This is consistent with values found in much larger local galaxy samples, e.g. q FIR = 2.34 ± 0.1 (Yun et al 2001).…”

Section: Determining K-corrected Values Of Q For Theĝ Subsamplesupporting

confidence: 92%

Application of the mid-IR radio correlation to the Ĝ sample and the search for advanced extraterrestrial civilisations

Garrett

2015

A&A

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Wright et al. (2014, ApJ, 792, 26) have embarked on a search for advanced Karadashev Type III civilisations via the compilation of a sample of sources with extreme mid-IR emission and colours. The aim is to furnish a list of candidate galaxies that might harbour an advanced Kardashev Type III civilisation; in this scenario, the mid-IR emission is then primarily associated with waste heat energy byproducts. I apply the mid-IR radio correlation to this Glimpsing Heat from Alien Technology (Ĝ) sample, a catalogue of 93 candidate galaxies compiled by Griffith et al. (2015, ApJS, 217, 25). I demonstrate that the mid-IR and radio luminosities are correlated for the sample, determining a k-corrected value of q 22 = 1.35 ± 0.42. By comparison, a similar measurement for 124 galaxies drawn from the First Look Survey (FLS) has q 22 = 0.87 ± 0.27. The statistically significant difference of the mean value of q 22 for these two samples, taken together with their more comparable far-IR properties, suggests that theĜ sample shows excessive emission in the mid-IR. The fact that theĜ sample largely follows the mid-IR radio correlation strongly suggests that the vast majority of these sources are associated with galaxies in which natural astrophysical processes are dominant. This simple application of the mid-IR radio correlation can substantially reduce the number of false positives in theĜ catalogue since galaxies occupied by advanced Kardashev Type III civilisations would be expected to exhibit very high values of q. I identify nine outliers in the sample with q 22 > 2 of which at least three have properties that are relatively well explained via standard astrophysical interpretations e.g. dust emission associated with nascent star formation and/or nuclear activity from a heavily obscured AGN. The other outliers have not been studied in any great detail, and are deserving of further observation. I also note that the comparison of resolved mid-IR and radio images of galaxies on sub-galactic (kpc) scales can also be useful in identifying and recognising artificial mid-IR emission from less advanced intermediate Type II/III civilisations. Nevertheless, from the bulk properties of theĜ sample, I conclude that Kardashev Type III civilisations are either very rare or do not exist in the local Universe.

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“…This is consistent with values found in much larger local galaxy samples, e.g. q FIR = 2.34 ± 0.1 (Yun et al 2001).…”

Section: Determining K-corrected Values Of Q For Theĝ Subsamplesupporting

confidence: 92%

Application of the mid-IR radio correlation to the Ĝ sample and the search for advanced extraterrestrial civilisations

Garrett

2015

A&A

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“…If radio flux density is observed in some other frequency ν which is not 1.4 GHz, it can be converted to observed-frame 1.4 GHz via S 1.4GHz = S ν (1.4GHz/ν * (1 + z)) α−1 . Yun et al (2001) show that the value of q IR in local starburst galaxies is constrained at q IR = 2.34 ± 0.72 with only a handful of outliers.…”

Section: The Fir/radio Correlationmentioning

confidence: 86%

Dusty star-forming galaxies at high redshift

2014

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Far-infrared and submillimeter wavelength surveys have now established the important role of dusty, star-forming galaxies (DSFGs) in the assembly of stellar mass and the evolution of massive galaxies in the Universe. The brightest of these galaxies have infrared luminosities in excess of 10 13 L with implied star-formation rates of thousands of solar masses per year. They represent the most intense starbursts in the Universe, yet many are completely optically obscured. Their easy detection at submm wavelengths is due to dust heated by ultraviolet radiation of newly forming stars. When summed up, all of the dusty, star-forming galaxies in the Universe produce an infrared radiation field that has an equal energy density as the direct starlight emission from all galaxies visible at ultraviolet and optical wavelengths. The bulk of this infrared extragalactic background light emanates from galaxies as diverse as gas-rich disks to mergers of intense starbursting galaxies. Major advances in far-infrared instrumentation in recent years, both spacebased and ground-based, has led to the detection of nearly a million DSFGs, yet our understanding of the underlying astrophysics that govern the start and end of the dusty starburst phase is still in nascent stage. This review is aimed at summarizing the current status of DSFG studies, focusing especially on the detailed characterization of the bestunderstood subset (submillimeter galaxies, who were summarized in the last review of this field over a decade ago, Blain et al. 2002), but also the selection and characterization of more recently discovered DSFG populations. We review DSFG population statistics, their physical properties including dust, gas and stellar contents, their environments, and current theoretical models related to the formation and evolution of these galaxies.

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“…Also the radio continuum emission can be used as a tracer of recent star formation in SFGs since it is nearly all due to synchrotron emission from relativistic electrons associated to SN remnants (Condon 1992). The empirical conversion between the radio power at 1.4 GHz and the SFR of the galaxy according to Yun et al (2001) is:…”

Section: Star Formation Rate Estimatementioning

confidence: 99%

Star formation properties of sub-mJy radio sources

Bonzini

Mainieri

Padovani

et al. 2015

Mon. Not. R. Astron. Soc.

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We investigate the star formation properties of ∼ 800 sources detected in one of the deepest radio surveys at 1.4 GHz. Our sample spans a wide redshift range (∼ 0.1 − 4) and about four orders of magnitude in star formation rate (SFR). It includes both star forming galaxies (SFGs) and active galactic nuclei (AGNs), further divided into radio-quiet and radio-loud objects. We compare the SFR derived from the far infrared luminosity, as traced by Herschel, with the SFR computed from their radio emission. We find that the radio power is a good SFR tracer not only for pure SFGs but also in the host galaxies of RQ AGNs, with no significant deviation with redshift or specific SFR. Moreover, we quantify the contribution of the starburst activity in the SFGs population and the occurrence of AGNs in sources with different level of star formation. Finally we discuss the possibility of using deep radio survey as a tool to study the cosmic star formation history.

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Radio Properties of Infrared‐Selected Galaxies in theIRAS2 Jy Sample

Cited by 908 publications

References 107 publications

Application of the mid-IR radio correlation to the Ĝ sample and the search for advanced extraterrestrial civilisations

Application of the mid-IR radio correlation to the Ĝ sample and the search for advanced extraterrestrial civilisations

Dusty star-forming galaxies at high redshift

Star formation properties of sub-mJy radio sources

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