scholarly journals Searching for New Be/X-ray Binaries in the Galactic Plane: the Case of GS 0834 – 43, 1WGA J1958.2+3232 and AXJ1820.5–1434

2000 ◽  
Vol 175 ◽  
pp. 739-742
Author(s):  
G.L. Israel ◽  
S. Covino ◽  
V.F. Polcaro ◽  
S. Campana ◽  
S. Mereghetti ◽  
...  
Keyword(s):  
Galactic Plane ◽  
Astronomical Observatory ◽  
Optical Counterpart ◽  
X Ray ◽  
Infra Red ◽  
X Ray Binaries

AbstractOver the last year we obtained X-ray (ROSAT, BeppoSAX and ASCA) and optical (at ESO and at the Astronomical Observatory of Loiano) to infra-red (AAO) observations of a sample of newly discovered X-ray pulsars. Among this sample we discovered the likely optical counterpart of three of them located in the Galactic plane: GS 0834–43, 1WGA J1958.2+3232 and AX J1820.5–1434.

scholarly journals Multiwavelength Temporal Behavior of GRS 1915+105

1998 ◽  
Vol 188 ◽  
pp. 396-397
Author(s):  
D. Hannikainen ◽  
Ph. Durouchoux
Keyword(s):  
Galactic Plane ◽  
Compact Object ◽  
Optical Counterpart ◽  
High Luminosity ◽  
Relativistic Jets ◽  
X Ray ◽  
Black Hole Candidate ◽  
Superluminal Motion ◽  
Extreme Variability ◽  
Sky Monitor

The transient X-ray source GRS 1915+105 was discovered in August 1992 with the GRANAT/WATCH all-sky monitor (Castro-Tirado et al. 1994). Subsequent VLA observations from March through April 1994 led to the discovery of apparent superluminal motion in a pair of radio condensations moving away from the compact radio core (Mirabel & Rodriguez 1994). These jet-like features are interpreted as a bipolar outflow with bulk velocity ~ 0.9c. Although no optical counterpart has been observed, due to the heavy extinction in the Galactic plane, and therefore not enabling measurements of the mass of the compact object, the hard X-ray spectrum and high luminosity (~ 1039 erg s−1), extreme variability in the X-ray light curve and the relativistic jets make GRS 1915+105 a strong black hole candidate.

scholarly journals Chemical abundances of secondary stars in low mass X-ray binaries

2006 ◽  
Vol 2 (S238) ◽  
pp. 43-48
Author(s):  
Jonay I. González Hernández ◽  
Rafael Rebolo ◽  
Garik Israelian
Keyword(s):  
Galactic Plane ◽  
Supernova Explosion ◽  
Compact Objects ◽  
Chemical Abundances ◽  
Mixing Processes ◽  
X Ray ◽  
Element Abundances ◽  
Supernova Explosions ◽  
Low Mass ◽  
X Ray Binaries

AbstractLow mass X-ray binaries (LMXBs) offer us an unique opportunity to study the formation processes of compact objects. Secondary stars orbiting around either a black hole or a neutron star could have captured a significant amount of the ejected matter in the supernova explosions that most likely originated the compact objects. The detailed chemical analysis of these companions can provide valuable information on the parameters involved in the supernova explosion such us the mass cut, the amount of fall-back matter, possible mixing processes, and the energy and the symmetry of the explosion. In addition, this analysis can help us to find out the birth place of the binary system. We have measured element abundances of secondary stars in the LMXBs A0620–00, Cen X-4, XTE J1118+480 and Nova Sco 94. We find solar or above solar metalicity for all these systems, what appears to be independent on their locations with respect to the Galactic plane. A comparison of the observed abundances with yields from different supernova explosion together with the kinematic properties of these systems suggest a supernova origin for the compact objects in all of them except for A0620–00, for which a direct collapse cannot be discarded.

scholarly journals X-Ray Binaries in M51 I: Catalog and Statistics

2021 ◽  
Vol 922 (2) ◽  
pp. 178
Author(s):  
Jared R. Rice ◽  
Blagoy Rangelov ◽  
Andrea Prestwich ◽  
Rupali Chandar ◽  
Luis Bichon ◽  
...  
Keyword(s):  
Optical Properties ◽  
Data Analysis ◽  
Luminosity Function ◽  
Binary Systems ◽  
Hubble Space Telescope ◽  
Archival Data ◽  
Optical Counterpart ◽  
Space Telescope ◽  
X Ray ◽  
X Ray Binaries

Abstract We used archival data from the Chandra X-ray Observatory (Chandra) and the Hubble Space Telescope, to identify 334 candidate X-ray binary systems and their potential optical counterparts in the interacting galaxy pair NGC 5194/5195 (M51). We present the catalog and data analysis of X-ray and optical properties for those sources, from the deep 892 ks Chandra observations, along with the magnitudes of candidate optical sources as measured in the 8.16 ks Hubble Space Telescope observations. The X-ray luminosity function of the X-ray sources above a few times 1036 erg s−1 follows a power law N ( > L X , b ) ∝ L X , b 1 − α with α = 1.65 ± 0.03. Approximately 80% of sources are variable over a 30 day window. Nearly half of the X-ray sources (173/334) have an optical counterpart within 0.″5.

Krzeminsky’s Optical Candidate for Cen X-3

1974 ◽  
Vol 2 (5) ◽  
pp. 289-290
Author(s):  
D. T. Wickramasinghe ◽  
N. V. Vidal ◽  
M. S. Bessell
Keyword(s):  
Wide Spread ◽  
Optical Counterpart ◽  
X Ray ◽  
X Ray Binaries

Cen X-3 and Her X-1 are the only two X-ray binaries which are known to pulsate periodically (at 4.8s and 1.2s respectively) in the X-ray region. The latter was identified with a fourteenth magnitude light and spectrum variable HZ Her, which was subsequently found to exhibit 1.24 second optical pulsations during certain phases. The possibility that Cen X-3 may prove to be as interesting an object optically has resulted in a wide spread search for its optical counterpart.

scholarly journals On obtaining neutron star mass and radius constraints from quiescent low-mass X-ray binaries in the Galactic plane

2018 ◽  
Vol 479 (3) ◽  
pp. 3634-3650 ◽  
Author(s):  
Alessio Marino ◽  
N Degenaar ◽  
T Di Salvo ◽  
R Wijnands ◽  
L Burderi ◽  
...  
Keyword(s):  
Neutron Star ◽  
Galactic Plane ◽  
X Ray ◽  
Star Mass ◽  
Neutron Star Mass ◽  
Low Mass ◽  
X Ray Binaries

scholarly journals A strange star scenario for the formation of isolated millisecond pulsars

2020 ◽  
Vol 633 ◽  
pp. A45 ◽  
Author(s):  
Long Jiang ◽  
Na Wang ◽  
Wen-Cong Chen ◽  
Xiang-Dong Li ◽  
Wei-Min Liu ◽  
...  
Keyword(s):  
Neutron Star ◽  
Galactic Plane ◽  
Critical Mass ◽  
Strange Star ◽  
Millisecond Pulsars ◽  
X Ray ◽  
Mass Distributions ◽  
The Galaxy ◽  
Low Mass ◽  
X Ray Binaries

According to the recycling model, neutron stars in low-mass X-ray binaries were spun up to millisecond pulsars (MSPs), which indicates that all MSPs in the Galactic plane ought to be harbored in binaries. However, about 20% Galactic field MSPs are found to be solitary. To interpret this problem, we assume that the accreting neutron star in binaries may collapse and become a strange star when it reaches some critical mass limit. Mass loss and a weak kick induced by asymmetric collapse during the phase transition (PT) from neutron star to strange star can result in isolated MSPs. In this work, we use a population-synthesis code to examine the PT model. The simulated results show that a kick velocity of ∼60 km s−1 can produce ∼6 × 103 isolated MSPs and birth rate of ∼6.6 × 10−7 yr−1 in the Galaxy, which is approximately in agreement with predictions from observations. For the purpose of comparisons with future observation, we also give the mass distributions of radio and X-ray binary MSPs, along with the delay time distribution.

scholarly journals Searching for New Be/X–ray Binaries in the SMC: the case of 1SAXJ0103–7209, XTEJ0055–724, RXJ0052–7319, XTEJ0111–7317 and 2E0050–7247

2000 ◽  
Vol 175 ◽  
pp. 681-684
Author(s):  
S. Covino ◽  
G.L. Israel ◽  
V.F. Polcaro ◽  
S. Campana ◽  
S. Mereghetti ◽  
...  
Keyword(s):  
Magellanic Cloud ◽  
Optical Observations ◽  
Small Magellanic Cloud ◽  
Optical Counterpart ◽  
X Ray ◽  
X Ray Binaries

AbstractWe obtained X–ray (ROSAT, BeppoSAX and ASCA) and optical observations of a sample of newly discovered X–ray pulsars. We here report on the discovery of the likely optical counterpart of five of them in the Small Magellanic Cloud: 1SAXJ0103–7209, XTEJ0055–724, RXJ0052–7319, XTEJ0111–7317 and 2E0050–7247.

Ultracompact X-Ray Binaries in Globular Clusters: Variability of the Optical Counterpart of X1832−330 in NGC 6652

2000 ◽  
Vol 530 (1) ◽  
pp. L21-L24 ◽  
Author(s):  
Eric W. Deutsch ◽  
Bruce Margon ◽  
Scott F. Anderson
Keyword(s):  
Globular Clusters ◽  
Optical Counterpart ◽  
X Ray ◽  
X Ray Binaries

scholarly journals The Local Low-Mass Binary Pulsar Population

1996 ◽  
Vol 165 ◽  
pp. 235-241
Author(s):  
D.R. Lorimer
Keyword(s):  
Birth Rate ◽  
Galactic Plane ◽  
Space Velocity ◽  
Scale Height ◽  
Selection Effects ◽  
X Ray ◽  
Order Of Magnitude ◽  
Low Mass ◽  
The Mean ◽  
X Ray Binaries

Using a fully self-consistent approach to account for known survey selection effects, we constrain the number and scale height of low-mass binary pulsars (LMBPs) in the local solar neighbourhood. Our results show that the local surface density of LMBPs with luminosities above 2.5 mJy kpc2 is ∼20 kpc−2. Assuming that these are long-lived (≲1010 yr) objects, their local birth rate is at least 2 10−9 kpc−2 yr−1. Whilst this is in excellent agreement with the birth rate of their proposed progenitors, the low-mass X-ray binaries, there are several uncertainties involved which could significantly increase our derived birth rate, perhaps by an order of magnitude. Models in which the scale height of LMBPs above the galactic plane exceeds 500 pc are found to be most consistent with the data. The mean space velocity at birth required to produce scale heights of this order in 1010 yr is found to be ≳ 80 km s−1.

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