Revealing the Nature of the Ulx and X-Ray Population of the Spiral Galaxy NGC 4088

Mezcua, Mar; Fabbiano, G.; Gladstone, Jeanette C.; Farrell, Sean; Soria, Roberto

doi:10.1088/0004-637x/785/2/121

Cited by 6 publications

(4 citation statements)

References 101 publications

(142 reference statements)

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“…We did an independent reanalysis of the EVN data and failed to confirm the detection. Mezcua et al (2014) observed another ULX, NGC 4088 X1, while, they were unsuccessful in achieving a reliable (SNR≥6) detection and identifying it as a synchrotron emission jet (T b ≥ 10 6 K).…”

Section: Dual Radio-emitting Agnmentioning

confidence: 99%

NGC 5252: a pair of radio-emitting active galactic nuclei?

Yang

Paragi

et al. 2016

Monthly Notices of the Royal Astronomical Society: Letters

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The X-ray source CXO J133815.6+043255 has counterparts in the UV, optical, and radio bands. Based on the multi-band investigations, it has been recently proposed by Kim et al. (2015) as a rarely-seen off-nucleus ultraluminous X-ray (ULX) source with a black hole mass of ≥ 10 4 M ⊙ in the nearby Seyfert galaxy NGC 5252. To explore its radio properties at very high angular resolution, we performed very longbaseline interferometry (VLBI) observations with the European VLBI Network (EVN) at 1.7 GHz. We find that the radio counterpart is remarkably compact among the known ULXs. It does not show a resolved structure with a resolution of a few milliarcsecond (mas), and the total recovered flux density is comparable to that measured in earlier sub-arcsecond-resolution images. The compact radio structure, the relatively flat spectrum, and the high radio luminosity are consistent with a weakly accreting supermassive black hole in a low-luminosity active galactic nucleus. The nucleus of NGC 5252 itself has similar radio properties. We argue that the system represents a relatively rare pair of active galactic nuclei, where both components emit in the radio.

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Section: Dual Radio-emitting Agnmentioning

confidence: 99%

NGC 5252: a pair of radio-emitting active galactic nuclei?

Yang

Paragi

et al. 2016

Monthly Notices of the Royal Astronomical Society: Letters

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“…The radio to X-ray flux follows roughly a linear correlation, albeit with a large scatter, similar to that derived for interacting supernovae (Chevalier, 2003), but the difference in L R supports the hypothesis the most ULXs are not supernovae. Furthermore, ULX bubbles do not resemble SNR: they carry at least two orders of magnitude more total energy, reach a size of hundreds of pc, have a different spectral shape, predominantly described by synchrotron emission (Pakull & Mirioni, 2002;Cseh et al, 2012;Mezcua et al, 2013bMezcua et al, , 2014.…”

Section: Ulxs In the Radio Bandmentioning

confidence: 99%

Radio investigation of Ultra-Luminous X-ray (ULX) Sources in the SKA Era

Wolter

Rushton²,

Mezcua³

et al. 2015

Proceedings of Advancing Astrophysics With the Square Kilometre Array — PoS(AASKA14)

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A puzzling class of exotic objects, which have been known about for more than 30 years, is reaching a new era of understanding. We have discovered hundreds of Ultra Luminous X-ray sources (ULXs) -non-nuclear sources with X-ray luminosity in excess of the Eddington luminosity for "normal" size stellar Black Holes (BH) -and we are making progresses towards understanding their emission mechanisms. The current explanations imply either a peculiar state of accretion onto a stellar size BH or the presence of an intermediate mass BH, the long-sought link between stellar and supermassive BHs. Both models might co-exist and therefore studying this class of object will give insight into the realm of accretion in a variety of environments and at the same time find look-alikes of the primordial seed BHs that are thought to be at the origin of todays supermassive BHs at the centre of galaxies. The radio band has been exploited only scantily due to the relative faint fluxes of the sources, but we know a number of interesting sources exhibiting both extended emission (like bubbles and possibly jets) and cores, as well as observed transient behaviour. The new eras of the SKA will lead us to a major improvement of our insight of the extreme accretion within ULXs. We will both investigate in detail known sources and research new and fainter ones. When we have reached a thorough understanding of radio emission in ULX we could also use the SKA as a discovery instrument for new ULX candidates. The new array will give an enormous space to discovery: sources like the ones currently known will be detected in a snapshot up to 50 Mpc instead of at 5 Mpc with long, pointed observations.Advancing Astrophysics with the Square Kilometre Array

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“…They can be classified into high mass XRBs and low mass XRBs, depending on the mass of the companion stars; i.e., ∼8 M ⊙ for high mass XRBs and ∼2 M ⊙ for low mass XRBs. XRBs can be found in both early and late-type galaxies (Mezcua et al 2014). However, early-type galaxies are usually dominated by low mass XRBs (Boroson et al 2011 andZhang et al 2012), while late-type star forming galaxies are typically dominated by high mass XRBs (Mezcua et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…XRBs can be found in both early and late-type galaxies (Mezcua et al 2014). However, early-type galaxies are usually dominated by low mass XRBs (Boroson et al 2011 andZhang et al 2012), while late-type star forming galaxies are typically dominated by high mass XRBs (Mezcua et al 2014).…”

Section: Introductionmentioning

confidence: 99%

X-ray Sources Population in NGC 1559

Nazri

Annuar

2019

2019 6th International Conference on Space Science and Communication (IconSpace)

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We present Chandra observation of the nearby spiral galaxy NGC 1559 to study the X-ray sources population in the galaxy. Based on our analysis, we detect twenty-four X-ray sources in the galaxy, of which six have 0.5-8 keV luminosities exceeding 10 39 erg s -1 , suggesting that they are possibly ultra-luminous X-ray source (ULX) candidates. The remaining eighteen sources have 0.5-8 keV luminosities below this threshold value, suggesting that they are likely to be X-ray binary candidates. We perform X-ray spectral analysis for the six ULX candidates and found that in general, their properties are broadly consistent with that found for other ULXs. The number of X-ray sources found in this galaxy is relatively high as compared to other galaxies with similar star formation rate of ~2.8 Myr -1 . This however could be attributed to the relatively high number of supernova occurrence (four) in the galaxy observed in the past years. We did not detect any X-ray nuclear point source in the galaxy, suggesting that NGC 1559 does not host an active galactic nucleus. This is supported by its HII optical spectral classification and our infrared analysis using WISE.

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Revealing the Nature of the Ulx and X-Ray Population of the Spiral Galaxy NGC 4088

Cited by 6 publications

References 101 publications

NGC 5252: a pair of radio-emitting active galactic nuclei?

NGC 5252: a pair of radio-emitting active galactic nuclei?

Radio investigation of Ultra-Luminous X-ray (ULX) Sources in the SKA Era

X-ray Sources Population in NGC 1559

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