Identification of selected sources from the ROSAT Galactic Plane
Survey. I.

Motch, C.; Guillout, P.; Haberl, F.; Krautter, J.; Pakull, M. W.; Pietsch, W.; Reinsch, K.; Voges, W.; Zickgraf, F. J.

doi:10.1051/aas:1998299

Cited by 114 publications

(129 citation statements)

References 21 publications

(37 reference statements)

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“…In order to characterise the nature of the secondary in RX J1914.4+2456, Ramsay et al (2000) Ramsay et al (2002b) where the magnitudes are with respect to Star 'B' of Motch et al (1996).…”

Section: Optical/ir Coloursmentioning

confidence: 99%

Ultra-Short Period Double-Degenerate Binaries

Cropper

Ramsay

et al. 2004

International Astronomical Union Colloquium

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Abstract. We review the current observational status of the ROSAT sources RX J1914.4+2456 and RX J0806.3+1527, and the evidence that these are ultra-short period (< 10 min) binary systems. We argue that an Intermediate Polar interpretation can be ruled out, that they are indeed compact binaries with a degenerate secondary, and that the period seen in the X-ray and optical is the orbital period. A white dwarf primary is preferred, but a neutron star cannot be excluded. We examine the capability of the three current double-degenerate models (Polar, Direct Accretor and Electric Star) to account for the observational characteristics of these systems. All models have difficulties with some aspects of the observations, but none can be excluded with confidence at present. The Electric Star model provides the best description, but the lifetime of this phase requires further investigation. These ultra-short period binaries will be strong gravitational wave emitters in the LISA bandpass, and because of their known source properties will be important early targets for gravitational wave studies.

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“…In order to characterise the nature of the secondary in RX J1914.4+2456, Ramsay et al (2000) Ramsay et al (2002b) where the magnitudes are with respect to Star 'B' of Motch et al (1996).…”

Section: Optical/ir Coloursmentioning

confidence: 99%

Ultra-Short Period Double-Degenerate Binaries

Cropper

Ramsay

et al. 2004

International Astronomical Union Colloquium

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“…The low fraction of AGN in the two high-galactic latitude identification programs might be due to the bias against fainter counterparts for which objective prism spectra were either not available or inconclusive -this would rise the fraction of bright-vs.-faint counterparts, and thus the ratio of stellar-vs.-extragalactic objects. The nearly complete lack of AGN in our low-galactic latitude field as compared to the nearly 20% fraction in Motch et al (1998) is most likely due to their survey covering galactic latitudes up to ±20 • , and our optical material not being deep enough to recover absorbed AGN behind the Milky Way disk. Figure 39 shows the histogram of the distances of the secure optical counterparts to their respective centroid ROSAT X-ray position for the Coma field.…”

Section: Identification Results and Global Statisticsmentioning

confidence: 73%

“…These authors find relative source class fractions of 42.1% AGN, 40.7% stars, 11.6% cluster of galaxies, and 3.9% galaxies. The ROSAT galactic plane survey (Motch et al 1998) achieved identification of 76 out of 93 sources, among them 40 bright/active stars, 25 AGN and 6 cataclysmic variables (this survey selected according to X-ray brightness and various hardness ratio criteria, so did not aim at completeness in a given area). These relative fractions of source types are largely consistent with our results (Table 12), though some differences show up.…”

Section: Identification Results and Global Statisticsmentioning

confidence: 99%

“…The X-ray light curve shows a bright (2.2 ± 0.3 cts/s) flare during one scan, with levels of 0.25 ± 0.13 cts/s and 0.31 ± 0.17 cts/s before and after (96 min apart). This GSC star has already been proposed as counterpart of this ROSAT source (Motch et al 1998), and is classified as high-proper motion star in Ivanov (2002). 17a,b: these objects are at no time brighter than the plate limit 17.5 mag.…”

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confidence: 86%

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Optical counterparts of ROSAT X-ray sources in two selected fields at low vs. high Galactic latitudes

Greiner

Richter

2015

A&A

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Context. The optical identification of large number of X-ray sources such as those from the ROSAT All-Sky Survey is challenging with conventional spectroscopic follow-up observations. Aims. We investigate two ROSAT All-Sky Survey fields of size 10 • × 10 • each, one at galactic latitude b = 83 • (26 Com), the other at b = −5 • (γ Sge), in order to optically identify the majority of sources. Methods. We used optical variability, among other more standard methods, as a means of identifying a large number of ROSAT All-Sky Survey sources. All objects fainter than about 12 mag and brighter than about 17 mag, in or near the error circle of the ROSAT positions, were tested for optical variability on hundreds of archival plates of the Sonneberg field patrol.Results. The present paper contains probable optical identifications of altogether 256 of the 370 ROSAT sources analysed. In particular, we found 126 active galactic nuclei (some of them may be misclassified cataclysmic variables, CVs), 17 likely clusters of galaxies, 16 eruptive double stars (mostly CVs), 43 chromospherically active stars, 65 stars brighter than about 13 mag, 7 UV Cet stars, 3 semiregular resp. slow irregular variable stars of late spectral type, 2 DA white dwarfs, 1 Am star, 1 supernova remnant and 1 planetary nebula. As expected, nearly all active galactic nuclei are found in the high-galactic latitude field, while the majority of CVs is located at low galactic latitudes. We identify in total 72 new variable objects. Conclusions. X-ray emission is, expectedly, tightly correlated with optical variability, and thus our new method for optically identifying X-ray sources is demonstrated to be feasible. Given the large number of optical plates used, this method was most likely not more efficient than e.g. optical spectroscopy. However, it required no telescope time, only access to archival data.

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“…Motch et al 1998;Véron-Cetty & Véron 2001;Kollatschny et al 2008). Mainly based on the detection of the high-ionisation line [Ne v] in the Spitzer/IRS spectra, the Seyfert 1.9 nucleus has been associated with the western galaxy of the system, coincident with 1SXPS J050819.8+172149 (Petric et al 2011;Alonso-Herrero et al 2012;Stierwalt et al 2013Stierwalt et al , 2014, see also the optical classification reported by Alonso-Herrero et al 2013).…”

Section: Sxps J0508198+172149mentioning

confidence: 93%

AGN feedback in action: a new powerful wind in 1SXPS J050819.8+172149?

Ballo

Severgnini

Braito

et al. 2015

A&A

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Context. Galaxy merging is widely accepted to be a driving factor in galaxy formation and evolution, while the feedback from actively accreting nuclei is thought to regulate the black hole-bulge coevolution and the star formation process. Aims. In this context, we focused on 1SXPS J050819.8+172149, a local (z = 0.0175) Seyfert 1.9 galaxy (L bol ∼ 4 × 10 43 erg s −1 ). The source belongs to an infrared-luminous interacting pair of galaxies, characterized by a luminosity for the whole system (due to the combination of star formation and accretion) of log(L IR /L ) = 11.2. We present here the first detailed description of the 0.3-10 keV spectrum of 1SXPS J050819.8+172149, monitored by Swift with nine pointings performed in less than one month. Methods. The X-ray emission of 1SXPS J050819.8+172149 is analysed by combining all the Swift pointings, for a total of ∼72 ks XRT net exposure. The averaged Swift-BAT spectrum from the 70-month survey is also analysed. Results. The slope of the continuum is Γ ∼ 1.8, with an intrinsic column density of ∼2.4 × 10 22 cm −2 , and a de-absorbed luminosity of ∼4 × 10 42 erg s −1 in the 2-10 keV band. Our observations provide a tentative (2.1σ) detection of a blueshifted Fe xxvi absorption line (rest-frame E ∼ 7.8 keV), thus suggesting the discovery of a new candidate powerful wind in 1SXPS J050819.8+172149. The physical properties of the outflow cannot be firmly assessed owing to the low statistics of the spectrum and to the observed energy of the line, too close to the higher boundary of the Swift-XRT bandpass. However, our analysis suggests that, if the detection is confirmed, the line could be associated with a high-velocity (v out ∼ 0.1c) outflow most likely launched within 80 r S . To our knowledge this is the first detection of a previously unknown ultrafast wind with Swift. The high column density suggested by the observed equivalent width of the line (EW ∼ −230 eV, although with large uncertainties) would imply a kinetic output strong enough to be comparable to the AGN bolometric luminosity.

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Identification of selected sources from the ROSAT Galactic Plane Survey. I.

Cited by 114 publications

References 21 publications

Ultra-Short Period Double-Degenerate Binaries

Ultra-Short Period Double-Degenerate Binaries

Optical counterparts of ROSAT X-ray sources in two selected fields at low vs. high Galactic latitudes

AGN feedback in action: a new powerful wind in 1SXPS J050819.8+172149?

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