1. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
PSR B1749-28 - Observations & Properties
Experiment during POS - 2013
Poruri Sai Rahul
Department of Physics
IIT Madras

2. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Pulsar Properties
Some properties of the pulsar, from ATNF Pulsar Catalogue1
and VizieR are2
1
http://goo.gl/Xuo4c
2
http://goo.gl/maeGC

3. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Pulsar Properties
Some properties of the pulsar, from ATNF Pulsar Catalogue1
and VizieR are2
• Strength S400 = 1.1Jy
• Dispersion Measure - DM = 50.88000kpc/cm3
• Highly Polarized Flux
• Barycentric period of Pulsar
P = 562.5578578340000ms
• Profile Width at 50% of peak
W 50 = 9.1ms
1
http://goo.gl/Xuo4c
2
http://goo.gl/maeGC

4. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Pulsar Spectrum
The spectrum of a pulsar can be modelled using a power law
spectrum -
fν = να
3
arXiv:1302.2053

5. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Pulsar Spectrum
The spectrum of a pulsar can be modelled using a power law
spectrum -
fν = να
where the average spectral index is −1.6 ± 0.3 3
3
arXiv:1302.2053

6. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Pulsar Spectrum
the strength of the pulsar is known at 3 different frequencies -

7. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Pulsar Spectrum
the strength of the pulsar is known at 3 different frequencies -
• S400 = 1100.00 mJy
• S600 = 335.00 mJy
• S1400 = 36.00 mJy

8. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Pulsar Spectrum
the strength of the pulsar is known at 3 different frequencies -
• S400 = 1100.00 mJy
• S600 = 335.00 mJy
• S1400 = 36.00 mJy
from these values, the spectral index of PSR B1749-28 is
estimated to be −2.676 and by extrapolating this, we estimate
that
• S326.5 = 1894 mJy

9. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Calibrator - 2053-201
The Calibrator - 2053-201 is a galaxy at a redshift of 0.1566224
The strength of the calibrator is known at 6 different
frequencies5 -
4
http://goo.gl/l3qoR
5
http://goo.gl/1d6OZ

10. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Calibrator - 2053-201
The Calibrator - 2053-201 is a galaxy at a redshift of 0.1566224
The strength of the calibrator is known at 6 different
frequencies5 -
• S80 = 16Jy
• S408 = 6.2Jy
• S1410 = 2.6Jy
• S2700 = 1.6Jy
• S5000 = 0.99Jy
• S8400 = 0.6Jy
4
http://goo.gl/l3qoR
5
http://goo.gl/1d6OZ

11. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Calibrator - 2053-201
The Calibrator - 2053-201 is a galaxy at a redshift of 0.1566224
The strength of the calibrator is known at 6 different
frequencies5 -
• S80 = 16Jy
• S408 = 6.2Jy
• S1410 = 2.6Jy
• S2700 = 1.6Jy
• S5000 = 0.99Jy
• S8400 = 0.6Jy
from these values, we estimate that
• S326.5 = 7.058Jy
4
http://goo.gl/l3qoR
5
http://goo.gl/1d6OZ

12. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Observations
• Observations of the pulsar took place on Jul 13 from
23:28:27 to 23:49:59 IST for a total of 1200s.

13. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Observations
• Observations of the pulsar took place on Jul 13 from
23:28:27 to 23:49:59 IST for a total of 1200s.
• The calibrator source for this specific pulsar is 2053-201,
observed for 300s.

14. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Observations
• Observations of the pulsar took place on Jul 13 from
23:28:27 to 23:49:59 IST for a total of 1200s.
• The calibrator source for this specific pulsar is 2053-201,
observed for 300s.
• the off source RA is 20 minutes east from the calibrator
and was observed for 300s.

15. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Data Analysis Pipeline

16. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Data Analysis Pipeline
The pulsar’s properties studied are

17. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Data Analysis Pipeline
The pulsar’s properties studied are
• Dispersion Measure
• Period of Pulsar
• Flux Density

18. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Data Analysis Pipeline
The pulsar’s properties studied are
• Dispersion Measure
• Period of Pulsar
• Flux Density
in that particular order.

19. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Results
The pulsar’s properties have been determined to be
6
http://adsabs.harvard.edu/abs/1969ApJ...157.1137J

20. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Results
The pulsar’s properties have been determined to be
• Dispersion Measure - 50.733 ± 1.764pc/cm3 against the
actual value of 50.88pc/cm3
6
http://adsabs.harvard.edu/abs/1969ApJ...157.1137J

21. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Results
The pulsar’s properties have been determined to be
• Dispersion Measure - 50.733 ± 1.764pc/cm3 against the
actual value of 50.88pc/cm3
• Period of Pulsar - 562.587ms against the actual value of
562.55785783400ms
6
http://adsabs.harvard.edu/abs/1969ApJ...157.1137J

22. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Results
The pulsar’s properties have been determined to be
• Dispersion Measure - 50.733 ± 1.764pc/cm3 against the
actual value of 50.88pc/cm3
• Period of Pulsar - 562.587ms against the actual value of
562.55785783400ms
• Distance - 1.2683 ± 0.0441kpc against the actual value of
1.53kpc - estimated from the DM and an average galactic
electron density n(e)6 of 4 × 10−2cm−3
6
http://adsabs.harvard.edu/abs/1969ApJ...157.1137J

23. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Results
The pulsar’s properties have been determined to be
• Dispersion Measure - 50.733 ± 1.764pc/cm3 against the
actual value of 50.88pc/cm3
• Period of Pulsar - 562.587ms against the actual value of
562.55785783400ms
• Distance - 1.2683 ± 0.0441kpc against the actual value of
1.53kpc - estimated from the DM and an average galactic
electron density n(e)6 of 4 × 10−2cm−3
• Flux Density - 1827.7 ± 59.8mJy against an estimated
value of 1894mJy
6
http://adsabs.harvard.edu/abs/1969ApJ...157.1137J

24. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Band response - Offsource

25. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Band response - Calibrator

26. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Band response - Offsource

27. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Band response - Calibrator

28. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Resources
Information regarding the pulsar and the calibrator were
obtained from the following sources -
7
http://goo.gl/Xuo4c
8
http://goo.gl/CAjoH
9
http://goo.gl/jw2Sg
10
http://goo.gl/maeGC

29. PSR
B1749-28 -
POS 2013
Poruri Sai
Rahul
Resources
Information regarding the pulsar and the calibrator were
obtained from the following sources -
• Australia Telescope National Facility
- ATNF Pulsar Catalogue7,
• NASA/IPAC Extra Galactic Database - NED8,
• SIMBAD9,
• VizieR10.
7
http://goo.gl/Xuo4c
8
http://goo.gl/CAjoH
9
http://goo.gl/jw2Sg
10
http://goo.gl/maeGC