Catalogue of far-infrared loops in the Galaxy

Könyves, V.; Kiss, Cs.; Moór, A.; Kiss, Zoltán; Tóth, L. V.

doi:10.1051/0004-6361:20065438

Cited by 41 publications

(48 citation statements)

References 48 publications

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“…About 50 percent of the clumps are located on FIR loops (Könyves et al 2007) that are boundary regions (shells) around the voids in the galactic ISM. A preliminary analysis of a sample of sources and their AKARI FIR photometry showed that the clumps located on the shells have ∼20% higher probability of being associated with YSO candidates (Marton 2012).…”

Section: Connection With Star Formationmentioning

confidence: 99%

Galactic cold cores

Juvela

Ristorcelli

Pagani

et al. 2012

A&A

Self Cite

143

221

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Context. In the project galactic cold cores we are carrying out Herschel photometric observations of cold regions of the interstellar clouds as previously identified with the Planck satellite. The aim of the project is to derive the physical properties of the population of cold clumps and to study its connection to ongoing and future star formation. Aims. We examine the cloud structure around the Planck detections in 71 fields observed with the Herschel SPIRE instrument by the summer of 2011. We wish to determine the general physical characteristics of the fields and to examine the morphology of the clouds where the cold high column density clumps are found. Methods. Using the Herschel SPIRE data, we derive colour temperature and column density maps of the fields. Together with ancillary data, we examine the infrared spectral energy distributions of the main clumps. The clouds are categorised according to their large scale morphology. With the help of recently released WISE satellite data, we look for signs of enhanced mid-infrared scattering ("coreshine"), an indication of growth of the dust grains, and have a first look at the star formation activity associated with the cold clumps. Results. The mapped clouds have distances ranging from ∼100 pc to several kiloparsecs and cover a range of sizes and masses from cores of less than 10 M to clouds with masses in excess of 10 000 M . Most fields contain some filamentary structures and in about half of the cases a filament or a few filaments dominate the morphology. In one case out of ten, the clouds show a cometary shape or have sharp boundaries indicative of compression by an external force. The width of the filaments is typically ∼0.2-0.3 pc. However, there is significant variation from 0.1 pc to 1 pc and the estimates are sensitive to the methods used and the very definition of a filament. Enhanced mid-infrared scattering, coreshine, was detected in four clouds with six additional tentative detections. The cloud LDN 183 is included in our sample and remains the best example of this phenomenon. About half of the fields are associated with active star formation as indicated by the presence of mid-infrared point sources. The mid-infrared sources often coincide with structures whose sub-millimetre spectra are still dominated by the cold dust.

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Section: Connection With Star Formationmentioning

confidence: 99%

Galactic cold cores

Juvela

Ristorcelli

Pagani

et al. 2012

A&A

Self Cite

143

221

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“…IRAS loops were identified by Könyves et al (2006) in the framework of an investigation of the large-scale structure of the diffuse ISM, started by Kiss et al (2004) using the 60 and 100 μm ISSA data (IRAS Sky Survey Atlas, Wheelock et al 1994). Galactic infrared loops (GIRLs, Könyves et al 2006) by definition must show an excess far-IR intensity confined to an arc-like feature extending to at least 60% of a complete ellipseshaped ring.…”

Section: Iras Loopsmentioning

confidence: 99%

“…Galactic infrared loops (GIRLs, Könyves et al 2006) by definition must show an excess far-IR intensity confined to an arc-like feature extending to at least 60% of a complete ellipseshaped ring. The thicknesses of the rings are given in the catalogue for all GIRLs.…”

Section: Iras Loopsmentioning

confidence: 99%

Planckearly results. XXIII. The first all-sky survey of Galactic cold clumps

Ade¹,

Aghanim²,

Arnaud³

et al. 2011

A&A

155

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We present the statistical properties of the Cold Clump Catalogue of Planck Objects (C3PO), the first all-sky catalogue of cold objects, in terms of their spatial distribution, dust temperature, distance, mass, and morphology. We have combined Planck and IRAS data to extract 10 342 cold sources that stand out against a warmer environment. The sources are distributed over the whole sky, including in the Galactic plane, despite the confusion, and up to high latitudes (>30 • ). We find a strong spatial correlation of these sources with ancillary data tracing Galactic molecular structures and infrared dark clouds where the latter have been catalogued. These cold clumps are not isolated but clustered in groups. Dust temperature and emissivity spectral index values are derived from their spectral energy distributions using both Planck and IRAS data. The temperatures range from 7 K to 19 K, with a distribution peaking around 13 K. The data are inconsistent with a constant value of the associated spectral index β over the whole temperature range: β varies from 1.4 to 2.8, with a mean value around 2.1. Distances are obtained for approximately one third of the objects. Most of the detections lie within 2 kpc of the Sun, but more distant sources are also detected, out to 7 kpc. The mass estimates inferred from dust emission range from 0.4 M to 2.4 × 10 5 M . Their physical properties show that these cold sources trace a broad range of objects, from low-mass dense cores to giant molecular clouds, hence the "cold clump" terminology. This first statistical analysis of the C3PO reveals at least two colder populations of special interest with temperatures in the range 7 to 12 K: cores that mostly lie close to the Sun; and massive cold clumps located in the inner Galaxy. We also describe the statistics of the early cold core (ECC) sample that is a subset of the C3PO, containing only the 915 most reliable detections. The ECC is delivered as a part of the Planck Early Release Compact Source Catalogue (ERCSC).

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“…The evolution of bubbles and super bubbles produced by supernovae explosions and stellar winds of association are the primary processes that determine the structure and energetic of all components of the diffused interstellar medium. [4,5] identified 462 Far infrared loops using 100 and 60 µm IRAS maps. They studied their size, luminosity, distributions and concluded that these structures are formed and governed by supernovae and stellar winds at the low galactic latitude.…”

Section: Introductionmentioning

confidence: 99%

A study of far infrared loop at -5o galactic latitude around pulsar J1627-5547

Jha

Aryal

2017

BIBECHANA

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We present physical properties of the core region of infrared loop G329-05 which is found to be located within 1 o from the pulsar PSR J1627-5547. The loop has 3-fold reduced flux density than its surroundings. In the 100 micron infrared map, a new cavity-like isolated far infrared dust structure of core region (size ~0.75 0 x 0.23 0 ) is found at R.A. (J2000)= 16 h 27 m 19.9 s & Dec. (J2000) = -56 0 35'14". This loop is believed to be formed because of high pressure events occurred in the past. The dust color temperature of the core region is found to lie in the range 25.26 ± 0.09 K to 27.91 ± 0.09 K, whereas the value of dust color temperature increased to 36.72 ± 0.18 K for the outer region. The dust color temperature and dust mass distribution maps showed that the low temperature region has greater density as expected. The dust mass of the core region of the loop is found to be 1.67 x 10 27 kg i.e. about 0.00835 Mʘ. The core region of the loop is found to be edge-on (i ˃78 0 ) whereas the larger structure is faced-on (i =0 0 ). Possible explanation of results will be presented.

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Catalogue of far-infrared loops in the Galaxy

Cited by 41 publications

References 48 publications

Galactic cold cores

Galactic cold cores

Planckearly results. XXIII. The first all-sky survey of Galactic cold clumps

A study of far infrared loop at -5o galactic latitude around pulsar J1627-5547

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