An IRAS survey of star-forming regions toward Cygnus

Odenwald, Sten; Schwartz, P.R.

doi:10.1086/172398

Cited by 57 publications

(57 citation statements)

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“…DR 6 is located between IC 1318b and c (Campbell et al 1981). The region appears extended in the IRAS bands (Odenwald & Schwartz 1993), but its far-infrared emission (Odenwald et al 1986) roughly coincides with the radio continuum size, 3 7 × 2 9 (Wendker et al 1991). The latter matches well the size of the nebulosity seen in our images.…”

Section: Ecx6-15supporting

confidence: 83%

“…The inventory includes the OB associations of the Cygnus arm (including the massive association Cygnus OB2; e.g. Knödlseder 2000 and references therein), the X-ray emitting Cygnus Superbubble, and several other star forming regions revealed by IRAS (Odenwald & Schwartz 1993). A vast amount of observations of Cygnus X, mostly at radio, far, Send offprint requests to: F. Comerón, e-mail: fcomeron@eso.org Based on observations collected at the Observatorio del Teide (Tenerife, Spain).…”

Section: Introductionmentioning

confidence: 99%

“…They also make up an appropriate sample showing the variety of morphologies that can arise from the interaction of small-and medium-sized aggregates of massive stars with the interstellar medium, while the fact that many of them may be physically related to a single, large complex allows one to study them at a similar spatial resolution using a single instrumental setup. Besides providing flux-limited complete samples of compact HII regions in Cygnus X, observations published to date at radio wavelengths have yielded insights on the morphological and kinematical properties of the ionized gas, while IRAS observations in the mid-infrared (Odenwald 1989;Odenwald & Schwartz 1993) have allowed the determination of some bulk properties of their embedded populations. Unfortunately, detailed studies of their stellar components have been hampered so far by the heavy obscuration towards most of these regions, rendering both the ionized gas and the stars ionizing it unobservable at visible wavelengths.…”

Section: Introductionmentioning

confidence: 99%

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Near-infrared imaging of compact HII regions in Cygnus X

Comerón

Torra

2001

A&A

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Abstract. We present a near-infrared imaging survey of compact HII regions in the direction of the Cygnus X complex, for which no previous observations at those wavelengths have been published so far. The targets have been selected from a catalog of sources in that region having a thermal spectral energy distribution between 408 and 4800 MHz (Wendker et al. 1991), and an inferred angular size smaller than 5 arcmin across. We present images in the JHK filters, color-magnitude, and color-color diagrams for each region. We also suggest and apply a method for estimating the distance by comparing the dereddened H-band flux from all the stars in the area of the HII region and the radio-continuum flux. Many of the regions imaged are clearly associated with stellar aggregates with different degrees of concentration, whose components show varying amounts of extinction. Some objects are often found in the region of the (J − H), (H − K) diagram indicating excess emission of circumstellar nature. A detailed discussion on each object is provided in the context of existing published observations at different wavelengths, in particular regarding the existence of ultracompact components. A number of ultracompact HII regions are found to have clearly visible unresolved or nearly unresolved K-band counterparts characterized by very red H − K colors, suggesting that the extinction may be low enough in their direction so as to allow the direct observation of the star ionizing the ultracompact component.

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Section: Ecx6-15supporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Near-infrared imaging of compact HII regions in Cygnus X

Comerón

Torra

2001

A&A

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“…Observations of magnetic fields in a range of environments are critical to provide useful inputs to theory (see, e.g., Crutcher 2012, and references therein). DR21(OH) is a massive star formation region located in the Cygnus-X molecular cloud complex (see, e.g., Odenwald & Schwartz 1993;Motte et al 2007). Recent astrometric maser measurements put it at a distance of 1.50 kpc (Rygl et al 2012).…”

Section: Introductionmentioning

confidence: 99%

The Zeeman Effect in the 44 GHZ Class I Methanol Maser Line Toward Dr21(oh)

Momjian¹,

Sarma²

2017

ApJ

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We report detection of the Zeeman effect in the 44 GHz Class I methanol maser line, toward the star-forming region DR21(OH). In a 219 Jy beam −1 maser centered at an LSR velocity of 0.83 km s −1 , we find a 20-σ detection of zB los =53.5±2.7 Hz. If 44 GHz methanol masers are excited at n∼10 7-8 cm −3 , then the Bversusn 1/2 relation would imply, from comparison with Zeeman effect detections in the CN(1−0) line toward DR21(OH), that magnetic fields traced by 44 GHz methanol masers in DR21(OH) should be ∼10 mG. Combined with our detected zB los =53.5 Hz, this would imply that the value of the 44 GHz methanol Zeeman splitting factor z is ∼5 Hz mG −1 . Such small values of z would not be a surprise, as the methanol molecule is non-paramagnetic, like H 2 O. Empirical attempts to determine z, as demonstrated, are important because there currently are no laboratory measurements or theoretically calculated values of z for the 44 GHz CH 3 OH transition. Data from observations of a larger number of sources are needed to make such empirical determinations robust.

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“…Dickel et al 1969;Wendker 1970;Odenwald & Schwartz 1993). It encompasses one of the richest concentrations of star forming regions in the Galaxy as a result of the Local Arm plunge into Cygnus and/or the existence of a coherent structure with enhanced star formation.…”

Section: Introductionmentioning

confidence: 99%

Does Cyg OB2 harbour any open cluster?

Bica

Bonatto

Dutra

2003

A&A

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Abstract.We report the detection of three new open cluster candidates located in Cygnus. Two of them are projected near the center of the rich compact association Cyg OB2. These two objects have been found during an optical inspection of that region with Digitized Sky Survey images. Using 2MASS photometry we determined their fundamental parameters. We assumed an age of 1-4 Myr and obtained a distance from the Sun d = 1.8 ± 0.2 kpc for both objects. Reddening values for Objects 1 and 2 are E(B− V) = 2.12± 0.06 and E(B− V) = 1.82± 0.06, respectively. A normal luminosity function is observed down to A0 stars, similar to that of NGC 6910. The two open cluster candidates may form a physical pair in Cyg OB2, similar to Tr 14/Tr 16 in Car OB1. Subsequently, we carried out a systematic search with 2MASS in a region 3 • × 3 • encompassing Cyg OB2. A third uncatalogued object resulted from this search which is projected just outside Cyg OB2.

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An IRAS survey of star-forming regions toward Cygnus

Cited by 57 publications

References 0 publications

Near-infrared imaging of compact HII regions in Cygnus X

Near-infrared imaging of compact HII regions in Cygnus X

The Zeeman Effect in the 44 GHZ Class I Methanol Maser Line Toward Dr21(oh)

Does Cyg OB2 harbour any open cluster?

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