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A Multivariate Statistical Analysis of Spiral Galaxy Luminosities. I. Data and Results
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by CERN Document Server A Multivariate Statistical Analysis of Spiral Galaxy Luminosities. I. Data and Results Alice Shapley California Institute of Technology, Pasadena CA, 91125, USA G. Fabbiano Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 P. B. Eskridge Ohio State University, Dept. of Astronomy, 140 W 18th Ave, Columbus, OH 43210 ABSTRACT We have performed a multiparametric analysis of luminosity data for a sample of 234 normal spiral and irregular galaxies observed in X-rays with the Einstein Observatory. This sample is representative of S and Irr galaxies, with a good coverage of morphological types and absolute magnitudes. In addition to X-ray and optical data, we have compiled H-band magnitudes, IRAS near- and far-infrared, and 6cm radio continuum observations for the sample from the literature. We have also performed a careful compilation of distance estimates. We have explored the effect of morphology by dividing the sample into early (S0/a-Sab), intermediate (Sb-Sbc), and late-type (Sc-Irr) subsamples. The data were analysed with bivariate and multivariate survival analysis techniques that make full use of all the information available in both detections and limits. We find that most pairs of luminosities are correlated when considered individually, and this is not due to a distance bias. Different luminosity-luminosity correlations follow different power-law relations. Contrary to previous reports, the LX LB correlation follows a power-law with exponent − larger than 1. Both the significances of some correlations and their power-law relations are morphology dependent. -
Dark Matter Thermonuclear Supernova Ignition
MNRAS 000,1{21 (2019) Preprint 1 January 2020 Compiled using MNRAS LATEX style file v3.0 Dark Matter Thermonuclear Supernova Ignition Heinrich Steigerwald,1? Stefano Profumo,2 Davi Rodrigues,1 Valerio Marra1 1Center for Astrophysics and Cosmology (Cosmo-ufes) & Department of Physics, Federal University of Esp´ırito Santo, Vit´oria, ES, Brazil 2Department of Physics and Santa Cruz Institute for Particle Physics, 1156 High St, University of California, Santa Cruz, CA 95064, USA Accepted XXX. Received YYY; in original form ZZZ ABSTRACT We investigate local environmental effects from dark matter (DM) on thermonuclear supernovae (SNe Ia) using publicly available archival data of 224 low-redshift events, in an attempt to shed light on the SN Ia progenitor systems. SNe Ia are explosions of carbon-oxygen (CO) white dwarfs (WDs) that have recently been shown to explode at sub-Chandrasekhar masses; the ignition mechanism remains, however, unknown. Recently, it has been shown that both weakly interacting massive particles (WIMPs) and macroscopic DM candidates such as primordial black holes (PBHs) are capable of triggering the ignition. Here, we present a method to estimate the DM density and velocity dispersion in the vicinity of SN Ia events and nearby WDs; we argue that (i) WIMP ignition is highly unlikely, and that (ii) DM in the form of PBHs distributed according to a (quasi-) log-normal mass distribution with peak log10¹m0/1gº = 24:9±0:9 and width σ = 3:3 ± 1:0 is consistent with SN Ia data, the nearby population of WDs and roughly consistent with other constraints from the literature. -
Star Formation in Three Nearby Galaxy Systems 3 Order to Analyse Their Luminosity Functions (Lfs) and Size Distributions
STAR FORMATION IN THREE NEARBY GALAXY SYSTEMS S. Temporin,1 S. Ciroi,2 A. Iovino,3 E. Pompei,4 M. Radovich,5, and P. Rafanelli2 1 2 Institute of Astrophysics, University of Innsbruck, Astronomy Department, University of 3 4 5 Padova, INAF-Brera Astronomical Observatory, ESO-La Silla, INAF-Capodimonte As- tronomical Observatory Abstract We present an analysis of the distribution and strength of star formation in three nearby small galaxy systems, which are undergoing a weak interaction, a strong interaction, and a merging process, respectively. The galaxies in all systems present widespread star formation enhancements, as well as, in some cases, nu- clear activity. In particular, for the two closest systems, we study the number- count, size, and luminosity distribution of H ii regions within the interacting galaxies, while for the more distant, merging system we analyze the general distribution of the Hα emission across the system and its velocity field. Keywords: Galaxies: interactions – Galaxies: star formation 1. Introduction Galaxy interactions have been known for a long time to trigger star forma- tion, although both observations and numerical simulations have shown that the enhancement of star formation depends, among other factors, on the or- arXiv:astro-ph/0411405v1 15 Nov 2004 bital geometry of the encounter. In some situations interactions might even suppress star formation. Hence, the star formation properties of interacting systems may serve as a clue to their interaction history. Here we analyse the star formation properties of three nearby galaxy sys- tems in differing evolutionary phases: the weakly interacting triplet AM 1238- 362 (Temporin et al. -
Lopsided Spiral Galaxies: Evidence for Gas Accretion
A&A 438, 507–520 (2005) Astronomy DOI: 10.1051/0004-6361:20052631 & c ESO 2005 Astrophysics Lopsided spiral galaxies: evidence for gas accretion F. Bournaud1, F. Combes1,C.J.Jog2, and I. Puerari3 1 Observatoire de Paris, LERMA, 61 Av. de l’Observatoire, 75014 Paris, France e-mail: [email protected] 2 Department of Physics, Indian Institute of Science, Bangalore 560012, India 3 Instituto Nacional de Astrofísica, Optica y Electrónica, Calle Luis Enrique Erro 1, 72840 Tonantzintla, Puebla, Mexico Received 3 January 2005 / Accepted 15 March 2005 Abstract. We quantify the degree of lopsidedness for a sample of 149 galaxies observed in the near-infrared from the OSUBGS sample, and try to explain the physical origin of the observed disk lopsidedness. We confirm previous studies, but for a larger sample, that a large fraction of galaxies have significant lopsidedness in their stellar disks, measured as the Fourier amplitude of the m = 1 component normalised to the average or m = 0 component in the surface density. Late-type galaxies are found to be more lopsided, while the presence of m = 2 spiral arms and bars is correlated with disk lopsidedness. We also show that the m = 1 amplitude is uncorrelated with the presence of companions. Numerical simulations were carried out to study the generation of m = 1viadifferent processes: galaxy tidal encounters, galaxy mergers, and external gas accretion with subsequent star formation. These simulations show that galaxy interactions and mergers can trigger strong lopsidedness, but do not explain several independent statistical properties of observed galaxies. To explain all the observational results, it is required that a large fraction of lopsidedness results from cosmological accretion of gas on galactic disks, which can create strongly lopsided disks when this accretion is asymmetrical enough. -
7.5 X 11.5.Threelines.P65
Cambridge University Press 978-0-521-19267-5 - Observing and Cataloguing Nebulae and Star Clusters: From Herschel to Dreyer’s New General Catalogue Wolfgang Steinicke Index More information Name index The dates of birth and death, if available, for all 545 people (astronomers, telescope makers etc.) listed here are given. The data are mainly taken from the standard work Biographischer Index der Astronomie (Dick, Brüggenthies 2005). Some information has been added by the author (this especially concerns living twentieth-century astronomers). Members of the families of Dreyer, Lord Rosse and other astronomers (as mentioned in the text) are not listed. For obituaries see the references; compare also the compilations presented by Newcomb–Engelmann (Kempf 1911), Mädler (1873), Bode (1813) and Rudolf Wolf (1890). Markings: bold = portrait; underline = short biography. Abbe, Cleveland (1838–1916), 222–23, As-Sufi, Abd-al-Rahman (903–986), 164, 183, 229, 256, 271, 295, 338–42, 466 15–16, 167, 441–42, 446, 449–50, 455, 344, 346, 348, 360, 364, 367, 369, 393, Abell, George Ogden (1927–1983), 47, 475, 516 395, 395, 396–404, 406, 410, 415, 248 Austin, Edward P. (1843–1906), 6, 82, 423–24, 436, 441, 446, 448, 450, 455, Abbott, Francis Preserved (1799–1883), 335, 337, 446, 450 458–59, 461–63, 470, 477, 481, 483, 517–19 Auwers, Georg Friedrich Julius Arthur v. 505–11, 513–14, 517, 520, 526, 533, Abney, William (1843–1920), 360 (1838–1915), 7, 10, 12, 14–15, 26–27, 540–42, 548–61 Adams, John Couch (1819–1892), 122, 47, 50–51, 61, 65, 68–69, 88, 92–93, -
Cfa4: Light Curves for 94 Type Ia Supernovae
CfA4: Light Curves for 94 Type Ia Supernovae Malcolm Hicken1, Peter Challis1, Robert P. Kirshner1, Armin Rest2, Claire E. Cramer3, W. Michael Wood-Vasey4, Gaspar Bakos1,5, Perry Berlind1, Warren R. Brown1, Nelson Caldwell1, Mike Calkins1, Thayne Currie6, Kathy de Kleer7, Gil Esquerdo8, Mark Everett8, Emilio Falco1, Jose Fernandez1, Andrew S. Friedman1, Ted Groner1, Joel Hartman1,5, Matthew J. Holman1, Robert Hutchins1, Sonia Keys1, David Kipping1, Dave Latham1, George H. Marion1, Gautham Narayan1, Michael Pahre1, Andras Pal1, Wayne Peters1, Gopakumar Perumpilly9, Ben Ripman1, Brigitta Sipocz1, Andrew Szentgyorgyi1, Sumin Tang1, Manuel A. P. Torres1, Amali Vaz10, Scott Wolk1, Andreas Zezas1 ABSTRACT We present multi-band optical photometry of 94 spectroscopically-confirmed Type Ia supernovae (SN Ia) in the redshift range 0.0055 to 0.073, obtained be- tween 2006 and 2011. There are a total of 5522 light curve points. We show that our natural system SN photometry has a precision of . 0.03 mag in BVr’i’, . 0.06 mag in u′, and . 0.07 mag in U for points brighter than 17.5 mag and estimate that it has a systematic uncertainty of 0.014, 0.010, 0.012, 0.014, 0.046, and 0.073 mag in BVr’i’u’U, respectively. Comparisons of our standard system photometry with published SN Ia light curves and comparison stars reveal mean agreement across samples in the range of ∼0.00-0.03 mag. We discuss the recent mea- surements of our telescope-plus-detector throughput by direct monochromatic illumination by Cramer et al. (in prep.). This technique measures the -
The Anti-Christian Roots of Nazism
THE ANTI-CHRISTIAN ROOTS OF NAZISM THE ANTI-CHRISTIAN ROOTS OF NAZISM BY DENNIS BARTON The ChurchinHistory Information Centre www.churchinhistory.org CONTENTS Page Chapter 2. 1. SEVERAL ROOTS 2. a. Introduction 2. b. Eugenics 3. c. The Volkischer and Pan-German Movements 4. d. The Occult 9. e. German Anti-Semitism 10. f. Russian Anti-Semitism 13. g. The Wagnerian Bayreuth Cult 14. h. The Thurle Society 17. 2. ADOLF HITLER 20. 3. HITLER'S MEIN KAMPF 22. 4. SYMBOLISM 24. 5. BAVARIAN CATHOLICS 26. 6. SUPPORTERS OF EUGENICS 26. A. Introduction 26. B. America 29. C. Britain 32. D. Marxism 33. COMMENT AND CONCLUSION 34. REFERENCES ‘CHURCHinHISTORY’ endeavours to make information regarding the involvement of the Church in history more easily available. 1 CHAPTER 1 SEVERAL ROOTS a. Introduction For over half a century, Communists asserted that the Catholic Church was a supporter of Hitler. This intense and slanderous propaganda was not without some success. It established in many minds a vague feeling that Catholic culture provided a fertile soil for Nazism and that the Church did little to prevent its development. Some may even believe that the Church encouraged Hitler's movement, and various anti-Catholic sects are trying to keep this myth alive. In order to refute these accusations it is necessary to examine the roots of this evil creed. Nazism did not appear suddenly from the pen of Adolf Hitler. It was preceded by several philosophical, political and cultural movements, which had been growing for many years. They were: eugenics, occultism, the Volkischer Movement, Pan-Germanism, anti-Catholicism, German anti-Semitism, Russian anti-Semitism, Wagnerian drama and the Thurle Society. -
Making a Sky Atlas
Appendix A Making a Sky Atlas Although a number of very advanced sky atlases are now available in print, none is likely to be ideal for any given task. Published atlases will probably have too few or too many guide stars, too few or too many deep-sky objects plotted in them, wrong- size charts, etc. I found that with MegaStar I could design and make, specifically for my survey, a “just right” personalized atlas. My atlas consists of 108 charts, each about twenty square degrees in size, with guide stars down to magnitude 8.9. I used only the northernmost 78 charts, since I observed the sky only down to –35°. On the charts I plotted only the objects I wanted to observe. In addition I made enlargements of small, overcrowded areas (“quad charts”) as well as separate large-scale charts for the Virgo Galaxy Cluster, the latter with guide stars down to magnitude 11.4. I put the charts in plastic sheet protectors in a three-ring binder, taking them out and plac- ing them on my telescope mount’s clipboard as needed. To find an object I would use the 35 mm finder (except in the Virgo Cluster, where I used the 60 mm as the finder) to point the ensemble of telescopes at the indicated spot among the guide stars. If the object was not seen in the 35 mm, as it usually was not, I would then look in the larger telescopes. If the object was not immediately visible even in the primary telescope – a not uncommon occur- rence due to inexact initial pointing – I would then scan around for it. -
Ngc Catalogue Ngc Catalogue
NGC CATALOGUE NGC CATALOGUE 1 NGC CATALOGUE Object # Common Name Type Constellation Magnitude RA Dec NGC 1 - Galaxy Pegasus 12.9 00:07:16 27:42:32 NGC 2 - Galaxy Pegasus 14.2 00:07:17 27:40:43 NGC 3 - Galaxy Pisces 13.3 00:07:17 08:18:05 NGC 4 - Galaxy Pisces 15.8 00:07:24 08:22:26 NGC 5 - Galaxy Andromeda 13.3 00:07:49 35:21:46 NGC 6 NGC 20 Galaxy Andromeda 13.1 00:09:33 33:18:32 NGC 7 - Galaxy Sculptor 13.9 00:08:21 -29:54:59 NGC 8 - Double Star Pegasus - 00:08:45 23:50:19 NGC 9 - Galaxy Pegasus 13.5 00:08:54 23:49:04 NGC 10 - Galaxy Sculptor 12.5 00:08:34 -33:51:28 NGC 11 - Galaxy Andromeda 13.7 00:08:42 37:26:53 NGC 12 - Galaxy Pisces 13.1 00:08:45 04:36:44 NGC 13 - Galaxy Andromeda 13.2 00:08:48 33:25:59 NGC 14 - Galaxy Pegasus 12.1 00:08:46 15:48:57 NGC 15 - Galaxy Pegasus 13.8 00:09:02 21:37:30 NGC 16 - Galaxy Pegasus 12.0 00:09:04 27:43:48 NGC 17 NGC 34 Galaxy Cetus 14.4 00:11:07 -12:06:28 NGC 18 - Double Star Pegasus - 00:09:23 27:43:56 NGC 19 - Galaxy Andromeda 13.3 00:10:41 32:58:58 NGC 20 See NGC 6 Galaxy Andromeda 13.1 00:09:33 33:18:32 NGC 21 NGC 29 Galaxy Andromeda 12.7 00:10:47 33:21:07 NGC 22 - Galaxy Pegasus 13.6 00:09:48 27:49:58 NGC 23 - Galaxy Pegasus 12.0 00:09:53 25:55:26 NGC 24 - Galaxy Sculptor 11.6 00:09:56 -24:57:52 NGC 25 - Galaxy Phoenix 13.0 00:09:59 -57:01:13 NGC 26 - Galaxy Pegasus 12.9 00:10:26 25:49:56 NGC 27 - Galaxy Andromeda 13.5 00:10:33 28:59:49 NGC 28 - Galaxy Phoenix 13.8 00:10:25 -56:59:20 NGC 29 See NGC 21 Galaxy Andromeda 12.7 00:10:47 33:21:07 NGC 30 - Double Star Pegasus - 00:10:51 21:58:39 -
Arxiv:1408.6413V1 [Astro-Ph.GA] 27 Aug 2014 Ot Africa
The Abundance Properties of Nearby Late-Type Galaxies. II. The Relation between Abundance Distributions and Surface Brightness Profiles L. S. Pilyugin1 and E. K. Grebel and I. A. Zinchenko1 Astronomisches Rechen-Institut, Zentrum f¨ur Astronomie der Universit¨at Heidelberg, M¨onchhofstr. 12–14, 69120 Heidelberg, Germany [email protected], [email protected], [email protected] A. Y. Kniazev2,3 South African Astronomical Observatory, PO Box 9, 7935 Observatory, Cape Town, South Africa [email protected] Received ; accepted arXiv:1408.6413v1 [astro-ph.GA] 27 Aug 2014 1Visiting Astronomer, Main Astronomical Observatory of National Academy of Sciences of Ukraine, 27 Zabolotnogo str., 03680 Kiev, Ukraine. 2Southern African Large Telescope Foundation, PO Box 9, 7935 Observatory, Cape Town, South Africa. 3Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow 119992, Russia –2– ABSTRACT The relations between oxygen abundance and disk surface brightness (OH–SB relation) in the infrared W 1 band are examined for a nearby late-type galaxies. The oxygen abundances were presented in Paper I. The photometric character- istics of the disks are inferred here using photometric maps from the literature through bulge-disk decomposition. We find evidence that the OH – SB relation is not unique but depends on the galactocentric distance r (taken as a fraction of the optical radius R25) and on the properties of a galaxy: the disk scale length h and the morphological T -type. We suggest a general, four-dimensional OH – SB relation with the values r, h, and T as parameters. The parametric OH – SB relation reproduces the observed data better than a simple, one-parameter relation; the deviations resulting when using our parametric relation are smaller by a factor of ∼1.4 than that the simple relation. -
Annual Report 1995 1996
ISAAC NEWTON GROUP OF TELESCOPES La Palma Annual Report 1995 1996 Published in Spain by the Isaac Newton Group of Telescopes (ING) Legal License: Apartado de Correos 321 E38700 Santa Cruz de La Palma Spain Phone: +34 922 405655, 425400 Fax: +34 922 425401 URL: http://www.ing.iac.es/ Editor and Designer: J Méndez ([email protected]) Preprinting: Palmedición, S. L. Printing: Litografía La Palma, S.L. Front Cover: Photo-composition made by Nik Szymanek (of the amateur UK Deep Sky CCD imaging team of Nik Szymanek and Ian King) in summer 1997. The telescope shown here is the William Herschel Telescope. Note: Pictures on page 4 are courtesy of Javier Méndez, and pictures on page 34 are courtesy of Neil OMahoney (top) and Steve Unger (bottom). ISAAC NEWTON GROUP OF TELESCOPES Annual Report of the PPARC-NWO Joint Steering Committee 1995-1996 Isaac Newton Group William Herschel Telescope Isaac Newton Telescope Jacobus Kapteyn Telescope 4 ING ANNUAL R EPORT 1995-1996 of Telescopes The Isaac Newton Group of telescopes (ING) consists of the 4.2m William Herschel Telescope (WHT), the 2.5m Isaac Newton Telescope (INT) and the 1.0m Jacobus Kapteyn Telescope (JKT), and is located 2350m above sea level at the Roque de Los Muchachos Observatory (ORM) on the island of La Palma, Canary Islands. The WHT is the largest telescope in Western Europe. The construction, operation, and development of the ING telescopes is the result of a collaboration between the UK, Netherlands and Eire. The site is provided by Spain, and in return Spanish astronomers receive 20 per cent of the observing time on the telescopes. -
Constraining Dark Matter Halo Profiles and Galaxy Formation Models Using
Draft version January 8, 2018 A Preprint typeset using LTEX style emulateapj v. 5/2/11 CONSTRAINING DARK MATTER HALO PROFILES AND GALAXY FORMATION MODELS USING SPIRAL ARM MORPHOLOGY. II. DARK AND STELLAR MASS CONCENTRATIONS FOR 13 NEARBY FACE-ON GALAXIES Marc S. Seigar1,2, Benjamin L. Davis3, Joel Berrier3,4,5, and Daniel Kennefick3,4 Draft version January 8, 2018 ABSTRACT We investigate the use of spiral arm pitch angles as a probe of disk galaxy mass profiles. We confirm our previous result that spiral arm pitch angles (P) are well correlated with the rate of shear (S) in disk galaxy rotation curves. We use this correlation to argue that imaging data alone can provide a powerful probe of galactic mass distributions out to large look-back times. We then use a sample of 13 galaxies, with Spitzer 3.6-µm imaging data and observed Hα rotation curves, to demonstrate how an inferred shear rate coupled with a bulge-disk decomposition model and a Tully-Fisher-derived velocity normalization can be used to place constraints on a galaxy’s baryon fraction and dark matter halo profile. Finally we show that there appears to be a trend (albeit a weak correlation) between spiral arm pitch angle and halo concentration. We discuss implications for the suggested link between supermassive black hole (SMBH) mass and dark halo concentration, using pitch angle as a proxy for SMBH mass. Subject headings: dark matter — galaxies: fundamental parameters — galaxies: halos — galaxies: kinematics and dynamics — galaxies: spiral — galaxies: structure 1. INTRODUCTION of most spiral density wave models (e.g.