Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Galaxies: spiral (3)
- Galaxies: stellar content (3)
- Infrared: galaxies (3)
- Galaxies: ISM (2)
- Galaxies: individual: M31 (2)
-
- Galaxies: star formation (2)
- X-rays: galaxies (2)
- Astronomy (1)
- Brown dwarfs (1)
- Catalogues (1)
- Galaxies: active (1)
- Galaxies: individual (M31) (1)
- ISM: molecules (1)
- Infrared: ISM (1)
- Methods: observational (1)
- Methods: statistical (1)
- NGC 224 (1)
- Physics (1)
- Quasars: general (1)
- Quasars: supermassive black holes (1)
- Stars: formation (1)
- Substellar mass limit (1)
- X-rays: binaries (1)
- X-rays: general (1)
Articles 1 - 9 of 9
Full-Text Articles in Entire DC Network
X-Rays Beware: The Deepest Chandra Catalogue Of Point Sources In M31, N. Vulic, S. C. Gallagher, P. Barmby
X-Rays Beware: The Deepest Chandra Catalogue Of Point Sources In M31, N. Vulic, S. C. Gallagher, P. Barmby
Physics and Astronomy Publications
This study represents the most sensitive Chandra X-ray point source catalogue of M31. Using 133 publicly available Chandra ACIS-I/S observations totalling ~1 Ms, we detected 795 X-ray sources in the bulge, north-east, and south-west fields of M31, covering an area of ≈0.6 deg2, to a limiting unabsorbed 0.5-8.0 keV luminosity of ~1034 erg s-1. In the inner bulge, where exposure is approximately constant, X-ray fluxes represent average values because they were determined from many observations over a long period of time. Similarly, our catalogue is more complete in the bulge fields since monitoring allowedmore transient sources to be detected. The …
Ten Simple Rules For Digital Data Storage, Edmund M. Hart, Pauline Barmby, David Lebauer, François Michonneau, Sarah Mount, Patrick Mulrooney, Timothée Poisot, Kara H. Woo, Naupaka B. Zimmerman, Jeffrey W. Hollister
Ten Simple Rules For Digital Data Storage, Edmund M. Hart, Pauline Barmby, David Lebauer, François Michonneau, Sarah Mount, Patrick Mulrooney, Timothée Poisot, Kara H. Woo, Naupaka B. Zimmerman, Jeffrey W. Hollister
Physics and Astronomy Publications
No abstract provided.
The Dustier Early-Type Galaxies Deviate From Late-Type Galaxies' Scaling Relations, S. Lianou, E. Xilouris, S. C. Madden, P. Barmby
The Dustier Early-Type Galaxies Deviate From Late-Type Galaxies' Scaling Relations, S. Lianou, E. Xilouris, S. C. Madden, P. Barmby
Physics and Astronomy Publications
Several dedicated surveys focusing on early-type galaxies (ETGs) reveal that significant fractions of them are detectable in all interstellar medium phases studied to date. We select ETGs from the Herschel Reference Survey that have both far-infrared Herschel and either H I or CO detection (or both).We derive their star formation rates (SFRs), stellar masses and dust masses viamodelling their spectral energy distributions.We combine these with literature information on their atomic and molecular gas properties, in order to relate their star formation, total gas mass and dust mass on global scales. The ETGs deviate from the dust mass-SFR relation and the …
The Extended Disc And Halo Of The Andromeda Galaxy Observed With Spitzer-Irac, Masoud Rafiei Ravandi, Pauline Barmby, Matthew L.N. Ashby, Seppo Laine, T. J. Davidge, Jenna Zhang, Luciana Bianchi, Arif Babul, S. C. Chapman
The Extended Disc And Halo Of The Andromeda Galaxy Observed With Spitzer-Irac, Masoud Rafiei Ravandi, Pauline Barmby, Matthew L.N. Ashby, Seppo Laine, T. J. Davidge, Jenna Zhang, Luciana Bianchi, Arif Babul, S. C. Chapman
Physics and Astronomy Publications
We present the first results from an extended survey of the Andromeda galaxy (M31) using 41.1 h of observations by Spitzer-IRAC at 3.6 and 4.5 μm. This survey extends previous observations to the outer disc and halo, covering total lengths of 4˙ 4 and 6˙6 along the minor and major axes, respectively. We have produced surface brightness profiles by combining the integrated light from background-corrected maps with stellar counts from a new catalogue of point sources. Using auxiliary catalogues, we have carried out a statistical analysis in colour-magnitude space to discriminate M31 objects from foreground Milky Way stars and background …
Analytic Models Of Brown Dwarfs And The Substellar Mass Limit, Sree Ram Valluri, Shantanu Basu, Sayantan Auddy
Analytic Models Of Brown Dwarfs And The Substellar Mass Limit, Sree Ram Valluri, Shantanu Basu, Sayantan Auddy
Physics and Astronomy Publications
We present the analytic theory of brown dwarf evolution and the lower mass limit of the hydrogen burning main-sequence stars and introduce some modifications to the existing models. We give an exact expression for the pressure of an ideal nonrelativistic Fermi gas at a finite temperature, therefore allowing for nonzero values of the degeneracy parameter. We review the derivation of surface luminosity using an entropy matching condition and the first-order phase transition between the molecular hydrogen in the outer envelope and the partially ionized hydrogen in the inner region.We also discuss the results of modern simulations of the plasma phase …
Stellar Populations In The Outskirts Of M31: The Mid-Infrared View, P. Barmby, M. Rafiei Ravandi
Stellar Populations In The Outskirts Of M31: The Mid-Infrared View, P. Barmby, M. Rafiei Ravandi
Physics and Astronomy Publications
The mid-infrared provides a unique view of galaxy stellar populations, sensitive to both the integrated light of old, low-mass stars and to individual dusty mass-losing stars. We present results from an extended Spitzer/IRAC survey of M31 with total lengths of 6.6 and 4.4 degrees along the major and minor axes, respectively. The integrated surface brightness profile proves to be surprisingly difficult to trace in the outskirts of the galaxy, but we can also investigate the disk/halo transition via a star count profile, with careful correction for foreground and background contamination. Our point-source catalog allows us to report on mid-infrared properties …
On R - W1 As A Diagnostic To Discover Obscured Active Galactic Nuclei In Wide-Area X-Ray Surveys, Stephanie M. Lamassa, Francesca Civano, Marcella Brusa, Daniel Stern, Eilat Glikman, Sarah Gallagher, C. Meg Urry, Sabrina Cales, Nico Cappelluti, Carolin Cardamone, Andrea Comastri, Duncan Farrah, Jenny E. Greene, S. Komossa, Andrea Merloni, Tony Mroczkowski, Priyamvada Natarajan, Gordon Richards, Mara Salvato, Kevin Schawinski, Ezequiel Treister
On R - W1 As A Diagnostic To Discover Obscured Active Galactic Nuclei In Wide-Area X-Ray Surveys, Stephanie M. Lamassa, Francesca Civano, Marcella Brusa, Daniel Stern, Eilat Glikman, Sarah Gallagher, C. Meg Urry, Sabrina Cales, Nico Cappelluti, Carolin Cardamone, Andrea Comastri, Duncan Farrah, Jenny E. Greene, S. Komossa, Andrea Merloni, Tony Mroczkowski, Priyamvada Natarajan, Gordon Richards, Mara Salvato, Kevin Schawinski, Ezequiel Treister
Physics and Astronomy Publications
Capitalizing on the all-sky coverage of WISE and the 35% and 50% sky coverage from Sloan Digital Sky Survey and Pan-STARRS, respectively, we explore the efficacy of mR (optical) - (mid-infrared), hereafter , as a color diagnostic to identify obscured supermassive black hole accretion in wide-area X-ray surveys. We use the ∼16.5 deg2 Stripe 82 X-ray survey data as a test bed to compare with R - K, an oft-used obscured active galactic nucleus (AGN) selection criterion, and examine where different classes of objects lie in this parameter space. Most stars follow a well-defined path in R - K versus …
The Jcmt Nearby Galaxies Legacy Survey-X. Environmental Effects On The Molecular Gas And Star Formation Properties Of Spiral Galaxies, Angus Mok, C. D. Wilson, J. Golding, B. E. Warren, F. P. Israel, S. Serjeant, J. H. Knapen, J. R. Sánchez-Gallego, P. Barmby, G. J. Bendo, E. Rosolowsky, P. Van Der Werf
The Jcmt Nearby Galaxies Legacy Survey-X. Environmental Effects On The Molecular Gas And Star Formation Properties Of Spiral Galaxies, Angus Mok, C. D. Wilson, J. Golding, B. E. Warren, F. P. Israel, S. Serjeant, J. H. Knapen, J. R. Sánchez-Gallego, P. Barmby, G. J. Bendo, E. Rosolowsky, P. Van Der Werf
Physics and Astronomy Publications
We present a study of the molecular gas properties in a sample of 98 H I - flux selected spiral galaxies within ~ 25 Mpc, using the CO J = 3 - 2 line observed with the James Clerk Maxwell Telescope. We use the technique of survival analysis to incorporate galaxies with CO upper limits into our results. Comparing the group and Virgo samples, we find a larger mean H2 mass in the Virgo galaxies, despite their lower mean H I mass. This leads to a significantly higher H2 to H I ratio for Virgo galaxies. Combining our data with …
Star Formation Laws In The Andromeda Galaxy: Gas, Stars, Metals And The Surface Density Of Star Formation, S. Rahmani, S. Lianou, P. Barmby
Star Formation Laws In The Andromeda Galaxy: Gas, Stars, Metals And The Surface Density Of Star Formation, S. Rahmani, S. Lianou, P. Barmby
Physics and Astronomy Publications
We use hierarchical Bayesian regression analysis to investigate star formation laws in the Andromeda galaxy (M31) in both local (30, 155 and 750 pc) and global cases. We study and compare the well-known Kennicutt-Schmidt law, the extended Schmidt law and the metallicity/star formation correlation. Using a combination of Hα and 24 μm emission, a combination of far-ultraviolet and 24 μm, and the total infrared emission, we estimate the total star formation rate (SFR) in M31 to be between 0.35 ± 0.04 and 0.4 ± 0.04 M⊙ yr-1. We produce a stellar mass surface density map using IRAC 3.6 μm emission …