97 research outputs found
Reducing LRIS longslit spectra in IRAF
The word IRAF scares me to date, though I am slowly getting used to using it. Here I am putting together my notes for reducing LRIS longslit spectra in IRAF. I will try to be general, but only to the extent that I expect my usage to vary. The document will often contain things which are pertinent to my current folders setup, gratings I use, etc.
The scripts referred to in this document are available on request. I might eventually upload a tarball containing all the codes
Neutron Stars and NuSTAR: A Systematic Survey of Neutron Star Masses in High Mass X-ray Binaries & Characterization of CdZnTe Detectors for NuSTAR
My thesis centers around the study of neutron stars, especially those in massive binary systems. To this end, it has two distinct components: the observational study of neutron stars in massive binaries with a goal of measuring neutron star masses and participation in NuSTAR, the first imaging hard X-ray mission, one that is extremely well suited to the study of massive binaries and compact objects in our Galaxy.
The Nuclear Spectroscopic Telescope Array (NuSTAR) is a NASA Small Explorer mission that will carry the first focusing high energy X-ray telescope to orbit. NuSTAR has an order-of-magnitude better angular resolution and has two orders of magnitude higher sensitivity than any currently orbiting hard X-ray telescope. I worked to develop, calibrate, and test CdZnTe detectors for NuSTAR. I describe the CdZnTe detectors in comprehensive detail here ā from readout procedures to data analysis. Detailed calibration of detectors is necessary for analyzing astrophysical source data obtained by the NuSTAR. I discuss the design and implementation of an automated setup for calibrating flight detectors, followed by calibration procedures and results.
Neutron stars are an excellent probe of fundamental physics. The maximum mass of a neutron star can put stringent constraints on the equation of state of matter at extreme pressures and densities. From an astrophysical perspective, there are several open questions in our understanding of neutron stars. What are the birth masses of neutron stars? How do they change in binary evolution? Are there multiple mechanisms for the formation of neutron stars? Measuring masses of neutron stars helps answer these questions. Neutron stars in high-mass X-ray binaries have masses close to their birth mass, providing an opportunity to disentangle the role of "nature" and "nurture" in the observed mass distributions. In 2006, masses had been measured for only six such objects, but this small sample showed the greatest diversity in masses among all classes of neutron star binaries. Intrigued by this diversity ā which points to diverse birth masses ā we undertook a systematic survey to measure the masses of neutron stars in nine high-mass X-ray binaries. In this thesis, I present results from this ongoing project.
While neutron stars formed the primary focus of my work, I also explored other topics in compact objects. Appendix A describes the discovery and complete characterization of a 1RXS J173006.4+033813, a polar cataclysmic variable. Appendix B describes the discovery of a diamond planet orbiting a millisecond pulsar, and our search for its optical counterpart.</p
An optimal method for scheduling observations of large sky error regions for finding optical counterparts to transients
The discovery and subsequent study of optical counterparts to transient
sources is crucial for their complete astrophysical understanding. Various
gamma ray burst (GRB) detectors, and more notably the ground--based
gravitational wave detectors, typically have large uncertainties in the sky
positions of detected sources. Searching these large sky regions spanning
hundreds of square degrees is a formidable challenge for most ground--based
optical telescopes, which can usually image less than tens of square degrees of
the sky in a single night. We present algorithms for optimal scheduling of such
follow--up observations in order to maximize the probability of imaging the
optical counterpart, based on the all--sky probability distribution of the
source position. We incorporate realistic observing constraints like the
diurnal cycle, telescope pointing limitations, available observing time, and
the rising/setting of the target at the observatory location. We use
simulations to demonstrate that our proposed algorithms outperform the default
greedy observing schedule used by many observatories. Our algorithms are
applicable for follow--up of other transient sources with large positional
uncertainties, like Fermi--detected GRBs, and can easily be adapted for
scheduling radio or space--based X--ray followup.Comment: Submitted to ApJ. 18 pages, 15 figure
Calcium-rich gap transients in the remote outskirts of galaxies
From the first two seasons of the Palomar Transient Factory, we identify three peculiar transients (PTF09dav, PTF10iuv, PTF11bij) with five distinguishing characteristics: peak luminosity in the gap between novae and supernovae (M_R ā - 15.5 to -16.5), rapid photometric evolution (t_(rise) ā12-15 days), large photospheric velocities (ā6000 to 11000 km s^(-1)), early spectroscopic evolution into nebular phase (ā1 to 3 months) and peculiar nebular spectra dominated by Calcium. We also culled the extensive decade-long Lick Observatory Supernova Search database and identified an additional member of this group, SN 2007ke. Our choice of photometric and spectroscopic properties was motivated by SN 2005E (Perets et al. 2010). To our surprise, as in the case of SN 2005E, all four members of this group are also clearly offset from the bulk of their host galaxy. Given the well-sampled early and late-time light curves, we derive ejecta masses in the range of 0.4--0.7 M_ā. Spectroscopically, we find that there may be a diversity in the photospheric phase, but the commonality is in the unusual nebular spectra. Our extensive follow-up observations rule out standard thermonuclear and standard core-collapse explosions for this class of "Calcium-rich gap" transients. If the progenitor is a white dwarf, we are likely seeing a detonation of the white dwarf core and perhaps, even shock-front interaction with a previously ejected nova shell. In the less likely scenario of a massive star progenitor, a very non-standard channel specific to a low-metallicity environment needs to be invoked (e.g., ejecta fallback leading to black hole formation). Detection (or lack thereof) of a faint underlying host (dwarf galaxy, cluster) will provide a crucial and decisive diagnostic to choose between these alternatives
Quantifying Period Uncertainty in X-ray Pulsars with Poisson-Limited Data
There have been significant developments in the period estimation tools and
methods for analysing high energy pulsars in the past few decades. However,
these tools lack well-standardised methods for calculating uncertainties in
period estimation and other recovered parameters for Poisson--dominated data.
Error estimation is important for assigning confidence intervals to the models
we study, but due to their high computational cost, errors in the pulsar
periods were largely ignored in the past. Furthermore, existing literature has
often employed semi-analytical techniques that lack rigorous mathematical
foundations or exhibit a predominant emphasis on the analysis of white noise
and time series data. We present results from our numerical and analytical
study of the error distribution of the recovered parameters of high energy
pulsar data using the method. We comprehensively formalise the measure
of error for the generic pulsar period with much higher reliability than some
common methods. Our error estimation method becomes more reliable and robust
when observing pulsars for few kilo-seconds, especially for typical pulsars
with periods ranging from a few milliseconds to a few seconds. We have verified
our results with observations of the \emph{Crab} pulsar, as well as a large set
of simulated pulsars. Our codes are publicly available for use.Comment: 18 pages, 23 figures, pre-prin
Explaining the asymmetric line profile in Cepheus X-4 with spectral variation across pulse phase
The high mass X-ray binary Cepheus X-4, during its 2014 outburst, showed evidence for an asymmetric cyclotron line in its hard X-ray spectrum. The 2014 spectrum provides one of the clearest cases of an asymmetric line profile among all studied sources with Cyclotron Resonance Scattering Features (CRSF). We present a phase-resolved analysis of NuSTAR and Suzaku data taken at the peak and during the decline phases of this outburst. We find that the pulse-phased resolved spectra are well-fit by a single, symmetric cyclotron feature. The fit parameters vary strongly with pulse phase: most notably the central energy and depth of the cyclotron feature, the slope of the power-law component, and the absorbing column density. We synthesise a āphase averagedā spectrum using the best-fitting parameters for these individual pulse phases, and find that this combined model spectrum has a similar asymmetry in the cyclotron features as discovered in phase-averaged data. We conclude that the pulse phase resolved analysis with simple symmetric line profiles when combined can explain the asymmetry detected in the phase-averaged data
A variable-frequency HFQPO in GRS 1915+105 as observed with Astrosat
From the analysis of more than 92 ks of data obtained with the laxpc
instrument on board Astrosat we have detected a clear high-frequency QPO whose
frequency varies between 67.4 and 72.3 Hz. In the classification of variability
classes of GRS 1915+105, at the start of the observation period the source was
in class omega and at the end the variability was that of class mu: both
classes are characterized by the absence of hard intervals and correspond to
disk-dominated spectra. After normalization to take into account time
variations of the spectral properties as measured by X-ray hardness, the QPO
centroid frequency is observed to vary along the hardness-intensity diagram,
increasing with hardness. We also measure phase lags that indicate that HFQPO
variability at high energies lags that at lower energies and detect systematic
variations with the position on the hardness-intensity diagram. This is the
first time that (small) variations of the HFQPO frequency and lags are observed
to correlate with other properties of the source. We discuss the results in the
framework of existing models, although the small (7%) variability observed is
too small to draw firm conclusions.Comment: 7 pages, 9 figures; Accepted in MNRAS. Some figures are at lower
resolution than journal versio
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