Kuehnel: Kuehnel moved page Sct X-1 to Scutum X-1

2018-04-18T09:48:47Z

Kuehnel moved page Sct X-1 to Scutum X-1

Kuehnel: Created page with "Also known as: 3A 1833-078 [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Sct+X-1+&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Simbad] '''Monitoring Data''': [ht..."

2018-04-18T09:48:30Z

Created page with "Also known as: 3A 1833-078 [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Sct+X-1+&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Simbad] '''Monitoring Data''': [ht..."

New page

Also known as: 3A 1833-078 [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Sct+X-1+&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Simbad]

'''Monitoring Data''': [http://xte.mit.edu/asmlc/srcs/sctx1.html|RXTE/ASM]], [[http://swift.gsfc.nasa.gov/docs/swift/results/transients/weak/SctX-1/ Swift/BAT]

= Coordinates =
[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Sct+X-1+&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Simbad]

{| class="wikitable"
| RA
| 18h 35' 25.83"
| DEC
| -07° 36' 50.1"
|}

= Binary system =

== Distance ==
Determined by <ref name="Koyama90" />: ~10 kpc

== Orbit ==

''' Period: ''' known upper limits (<ref name="Kaplan07" />): 
For Mcomp = 13 M⊙ and Rcomp = 500 R⊙ : Porb > 2 yr 
For Mcomp = 1.2 M⊙ and Rcomp = 100 R⊙ : Porb > 0.8 yr 

== Optical Companion ==

''' Names :''' 2MASS J18352582-0736501 (<ref name="Kaplan07" />) 
''' Type :''' Red giant '''or''' red supergiant (<ref name="Kaplan07" />) 

The figure below was obtained from <ref name="Kaplan07" />. 
[[File:sctx-1_ircounterpart_kaplan07.png|300px|1193]]

= Available data =

* '''XMM-Newton''': 30 ksec observation of close by radio pulsar (Oct 2005)
* '''Chandra''': HRC-I image of AX J183518-0754 (3 ksec)
* '''RXTE''': < 20 ksec observations (Aug 1997); part of Galactic Bulge Monitoring (C. Markwardt)
* '''ASCA''': 20" off-axis obsevartions <30ksec in Galactic Ridge Monitoring (Apr 1994, Oct 1997)
* '''BeppoSAX''': GRB observations close by

= Description =

Sct X-1 is symbiotic X-ray binary discovered by a sounding rocket (<ref name="Hill74" />). 
It is an eclipsing system at a distance of ~10 kpc (<ref name="Koyama90" />), composed of an accreting pulsar (<ref name="YamauchiKoyama93" />) and a near-IR counterpart, a late type giant or a supergiant. 
The position of the x-ray source was found with ''XMM-Newton'' data (<ref name="Kaplan07" />). 
The X-rays are most likely due to wind-fed accretion or due to an elliptical orbit (<ref name="Kaplan07" />).

== Flux ==

Between 0.5 and 10 keV, Sct X-1 has a luminosity of 1.4 x 1033 d2''kpc'' (<ref name="Kaplan07" />).

== Spectrum ==

The source has a hard spectrum with a low-energy cutoff and an photon index ranging between 1.5 (<ref name="Koyama91" />) and 2.0 (<ref name="Kaplan07" />), and a variable absorption from 0.8 x 1022 cm-2 (<ref name="Koyama91" />) to (2 - 4) x 1023 cm-2 (<ref name="Kaplan07" />) in the low energy band. These variations in absorbtion are associated with the stellar wind accretion (<ref name="Kaplan07" />). It is not clear yet if there is an iron K fluorescence line at 6.4 keV (<ref name="Koyama91" />, <ref name="Kaplan07" />). 
The figure below was obtained from <ref name="Kaplan07" />. 
[[File:sctx-1_xray_spec_kaplan07.png|400px|2999]]

== Pulse Profile ==

Sct X-1 shows a pulse period of: 112.86 ± 0.08 sec (<ref name="Kaplan07" />).

The figure below (obtained from <ref name="Kaplan07" />), shows the double-peaked pulse profile. 
[[File:sctx-1_pulse_period_kaplan07.png|400px|3267]]

== Pulse Period Evolution ==

The source has had a steady spin down rate of 3.9 x 10-9 s s-1 averaged over 17 yr (see figure below obtained from <ref name="Kaplan07" />).

[[File:sctx-1_pulse_per_evol_kaplan07.png|400px|3522]]

'''References'''

← Older revision	Revision as of 09:48, 18 April 2018
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Scutum X-1 - Revision history

Kuehnel: Kuehnel moved page Sct X-1 to Scutum X-1

Kuehnel: Created page with "Also known as: 3A 1833-078 [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Sct+X-1+&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Simbad] '''Monitoring Data''': [ht..."