Optical spectroscopy of microquasar candidates at low Galactic latitudes

Martı́, Josep; Paredes, J. M.; Bloom, J.; Casares, J.; Ribó, M.; Falco, E.

doi:10.1051/0004-6361:20031511

Cited by 16 publications

(13 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They did not find any new MCQ and came to the conclusion that the number of MCQ in the Galaxy is probably very small (Marti et al 2004). Our data seem to confirm such a conclusion.…”

Section: Introductionsupporting

confidence: 82%

See 1 more Smart Citation

A search for very active stars in the Galaxy

Tsarevsky¹,

Pacheco²,

Кардашев³

et al. 2005

A&A

View full text Add to dashboard Cite

Abstract. We report the first results of a systematic search near the plane of the Galaxy for so-called very active stars (VAS), which are characterized by a hard X-ray spectrum and activity in the radio domain. Candidates with hard X-ray binary-like spectra have been selected from the Bright ROSAT Source Catalogue in the Zone of Avoidance (|b| < 20• ) and were tentatively identified in GB6/PMM/NVSS radio surveys. Most of them were observed with the ATCA and VLA. Precise radio coordinates have led to unambiguous optical identification for 60 candidates, and a sub-sample of five of them has been observed with the VLT. Also some discovery and confirmatory spectra were obtained with the AAT (4-m) and BTA (6-m). Spectroscopy with moderate dispersion, made with the FORS1 spectrograph of the VLT has revealed two stellar objects (one of them, VASC J1628-41, is definitively a binary VAS), one new AGN and two featureless spectrum sources. One of these objects, VASC J1353-66, shows marginal evidence of proper motion, which, if confirmed, would imply the discovery of a new type of galactic source.

show abstract

“…They did not find any new MCQ and came to the conclusion that the number of MCQ in the Galaxy is probably very small (Marti et al 2004). Our data seem to confirm such a conclusion.…”

Section: Introductionsupporting

confidence: 82%

“…Two other objects show featureless spectra, suggesting that they are probably new BL Lac type objects in the ZOA (like another two objects discovered in a similar way by Marti et al 2004). Surprisingly, for one of these objects, VASC J1353-66, the NOMAD catalog indicates a small proper motion.…”

Section: Discussionmentioning

confidence: 74%

A search for very active stars in the Galaxy

Tsarevsky¹,

Pacheco²,

Кардашев³

et al. 2005

A&A

View full text Add to dashboard Cite

show abstract

“…The source has also been reported as a radio‐loud AGN both by Brinkman et al (1997) and by Laurent‐Muehleisen et al (1997). The optical spectrum displays a featureless continuum heavily absorbed at shorter wavelengths (Marti et al 2004). All this observational evidence points to a blazar interpretation for this source, most likely of the BL Lac class.…”

Section: The Individual Sourcesmentioning

confidence: 77%

Using the ROSAT catalogue to find counterparts for unidentified objects in the first Fermi/LAT catalogue

Stephen

Bassani

Landi

et al. 2010

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

There are a total of 1451 gamma‐ray emitting objects in the Fermi Large Area Telescope First Source Catalogue. The point source location accuracy of typically a few arcmin has allowed the counterparts for many of these sources to be found at other wavelengths, but even so there are 630 which are described as having no plausible counterpart at 80 per cent confidence. In order to help identify the unknown objects, we have cross‐correlated the positions of these sources with the ROSAT All Sky Survey Bright Source Catalogue. In this way, for Fermi sources which have a possible counterpart in soft X‐rays, we can use the much smaller ROSAT error box to search for identifications. We find a strong correlation between the two samples and calculate that there are about 60 sources with a ROSAT counterpart. Using the ROSAT error boxes we provide tentative associations for half of them, demonstrate that the majority of these are either blazars or blazar candidates, and give evidence that most belong to the BL Lac class. Given that they are X‐ray selected and most are high synchrotron peaked objects, which indicates the presence of high‐energy electrons, these sources are also good candidates for TeV emission, and therefore good probes of the extragalactic background light.

show abstract

“…In any case, it is desirable to enlarge the MQ sample to allow meaningful statistical studies. To this end, Paredes et al (2002) have recently carried out a search for new REXBs at galactic latitudes of |b| < 5 • , and although the first results were promising (Ribó et al 2002a), recent optical spectroscopic observations (Martí et al 2004) reveal that most of the studied sources, if not all, are extragalactic quasars.…”

Section: Introductionmentioning

confidence: 99%

The dust-enshrouded microquasar candidate AX J1639.0-4642 = IGR J16393-4643

Combi

Ribó

Mirabel

et al. 2004

A&A

Self Cite

View full text Add to dashboard Cite

Abstract. We present a multiwavelength study of the field containing the unidentified X-ray source AX J1639.0−4642, discovered with the ASCA observatory and recently detected with the IBIS telescope, onboard the INTEGRAL satellite, dubbed IGR J16393−4643. The huge hydrogen column density towards the source, the hard spectral index in the 0.7-10 keV band and its flux variability suggest that the source is a High Mass X-ray Binary (HMXB) enshrouded by dust. Our search reveals the presence of a non-thermal radio counterpart within the X-ray error box. After a study of the broadband emission from X-rays to the radio domain, we propose that AX J1639.0−4642 is a dust-enshrouded Microquasar (MQ) candidate. In addition, the X-ray source is well within the 95% location contour of the unidentified γ-ray source 3EG J1639−4702. The main properties of AX J1639.0−4642/3EG J1639−4702 are consistent with those of two other MQs previously proposed to display high-energy γ-ray emission.

show abstract

Optical spectroscopy of microquasar candidates at low Galactic latitudes

Cited by 16 publications

References 14 publications

A search for very active stars in the Galaxy

A search for very active stars in the Galaxy

Using the ROSAT catalogue to find counterparts for unidentified objects in the first Fermi/LAT catalogue

The dust-enshrouded microquasar candidate AX J1639.0-4642 = IGR J16393-4643

Contact Info

Product

Resources

About