67 research outputs found
The H-alpha and Infrared Star Formation Rates for the Nearby Field Galaxy Survey
We investigate the H-alpha and infrared star formation rate (SFR) diagnostics
for galaxies in the Nearby Field Galaxy Survey (NFGS). For the 81 galaxies in
our sample, we derive H-alpha fluxes (included here) from integrated spectra.
There is a strong correlation between the ratio of far-infrared to optical
luminosities L(FIR)/L(H-alpha) and the extinction E(B-V) measured with the
Balmer decrement. Before reddening correction, the SFR(IR) and SFR(H-alpha) are
related to each other by a power-law. Correction of the SFR(H-alpha) for
extinction using the Balmer decrement and a classical reddening curve both
reduces the scatter in the SFR(IR)-SFR(H-alpha) correlation and results in a
much closer agreement (within ~10%) between the two SFR indicators. This SFR
relationship spans 4 orders of magnitude and holds for all Hubble types with
IRAS detections in the NFGS. A constant ratio between the SFR(IR) and
SFR(H-alpha) for all Hubble types, including early types (S0-Sab), suggests
that the IR emission in all of these objects results from a young stellar
population.Comment: 23 pages, 5 figures, 1 table. Accepted for publication in the
Astronomical Journal. V2: Important changes: IRAS fluxes updated. Only
moderate and good quality IRAS FIR fluxes are now used, resulting in slight
changes to the equations and figures. The IR and H-alpha SFRs now agree to
within ~10%, rather than ~30% as quoted previousl
Detection of HD in the Orion molecular outflow
We report a detection in the interstellar medium of an infrared transition within the electronic ground state of the deuterated hydrogen molecule, HD. Through a deep integration with the Short-Wavelength-Spectrometer on ISO, the pure rotational v=0-0 R(5) line at 19.43um was detected toward the Orion (OMC-1) outflow at its brightest H_2 emission region, Peak 1. The ~20" beam-averaged observed flux of the line is (1.84 +- 0.4) 10^-5 erg cm^-2 s^-1 sr^-1. Upper flux limits were derived for sixteen other rotational and ro-vibrational HD lines in the wavelength range 2.5 to 38 um. We utilize the rich spectrum of H_2 lines observed at the same position to correct for extinction, and to derive a total warm HD column density under the assumption that similar excitation conditions apply to H_2 and HD. Accounting for non-LTE HD level populations in a partially dissociated gas, our best estimate for the total warm HD column density is N(HD)=(2.0+-0.75)10^16 cm^-2. The warm molecular hydrogen column density is (2.21+-0.24)10^21 cm^-2, so that the relative abundance is [HD]/[H_2]=(9.0+-3.5)10^{-6}. Accounting for HD depletion relative to H_2 in partially dissociative shocks we derive a deuterium abundance in the warm shocked gas, [D]/[H]= (7.6+-2.9)10^-6. Our implied deuterium abundance is low compared to previous determinations in the local interstellar medium, but it is consistent with two other recent observations toward Orion, suggesting that deuterium may be significantly depleted there
Comet C/2004 Q2 (MACHHOLZ): Parent Volatiles, a Search for Deuterated Methane, and Constraint on the CH4 Spin Temperature
High-dispersion (l/dl ~ 25,000) infrared spectra of Comet C/2004 Q2
(Machholz) were acquired on Nov. 28-29, 2004, and Jan. 19, 2005 (UT dates) with
NIRSPEC at the Keck-2 telescope on Mauna Kea. We detected H2O, CH4, C2H2, C2H6,
CO, H2CO, CH3OH, HCN, and NH3 and we conducted a sensitive search for CH3D. We
report rotational temperatures, production rates, and mixing ratios (with
respect to H2O) at heliocentric distances of 1.49 AU (Nov. 2004) and 1.21 AU
(Jan. 2005). We highlight three principal results: (1) The mixing ratios of
parent volatiles measured at 1.49 AU and 1.21 AU agree within confidence
limits, consistent with homogeneous composition in the mean volatile release
from the nucleus of C/2004 Q2. Notably, the relative abundance of C2H6/C2H2 is
substantially higher than those measured in other comets, while the mixing
ratios C2H6/H2O, CH3OH/H2O, and HCN/H2O are similar to those observed in
comets, referred to as "organics-normal". (2) The spin temperature of CH4 is >
35-38 K, an estimate consistent with the more robust spin temperature found for
H2O. (3) We obtained a 3s upper limit of CH3D/CH4 < 0.020 (D/H < 0.005). This
limit suggests that methane released from the nucleus of C/2004 Q2 is not
dominated by a component formed in extremely cold (near 10 K) environments.
Formation pathways of both interstellar and nebular origin consistent with the
measured D/H in methane are discussed. Evaluating the relative contributions of
these pathways requires further modeling of chemistry including both gas-phase
and gas-grain processes in the natal interstellar cloud and in the
protoplanetary disk.Comment: Accepted by The Astrophysical Journa
Dust detection by the wave instrument on STEREO: nanoparticles picked up by the solar wind?
The STEREO/WAVES instrument has detected a very large number of intense
voltage pulses. We suggest that these events are produced by impact ionisation
of nanoparticles striking the spacecraft at a velocity of the order of
magnitude of the solar wind speed. Nanoparticles, which are half-way between
micron-sized dust and atomic ions, have such a large charge-to-mass ratio that
the electric field induced by the solar wind magnetic field accelerates them
very efficiently. Since the voltage produced by dust impacts increases very
fast with speed, such nanoparticles produce signals as high as do much larger
grains of smaller speeds. The flux of 10-nm radius grains inferred in this way
is compatible with the interplanetary dust flux model. The present results may
represent the first detection of fast nanoparticles in interplanetary space
near Earth orbit.Comment: In press in Solar Physics, 13 pages, 5 figure
Evidence for methane and ammonia in the coma of comet P/Halley
Methane and ammonia abundances in the coma of Halley are derived from Giotto IMS data using an Eulerian model of chemical and physical processes inside the contact surface to simulate Giotto HIS ion mass spectral data for mass-to-charge ratios (m/q) from 15 to 19. The ratio m/q = 19/18 as a function of distance from the nucleus is not reproduced by a model for a pure water coma. It is necessary to include the presence of NH_3 , and uniquely NH_3 , in coma gases in order to explain the data. A ratio of production rates Q(NH_3)/Q(H20) = 0.01-Q.02 results in model values approximating the Giotto data. Methane is identified as the most probable source of the distinct peak at m/q = 15.
The observations are fit best with Q(CH_4)/Q(H_20) = 0.02. The chemical composition of the comet nucleus implied by these production rate ratios is unlike that of the outer planets. On the other hand, there are also significant differences from observations of gas phase interstellar material
Infrared Emission from Interstellar Dust. I. Stochastic Heating of Small Grains
We present a method for calculating the infrared emission from a population
of dust grains heated by starlight, including very small grains for which
stochastic heating by starlight photons results in high temperature transients.
Because state-to-state transition rates are generally unavailable for complex
molecules, we consider model PAH, graphitic, and silicate grains with realistic
vibrational mode spectra and realistic radiative properties. The vibrational
density of states is used in a statistical-mechanical description of the
emission process. Unlike previous treatments, our approach fully incorporates
multiphoton heating effects, important for large grains or strong radiation
fields. We discuss how the "temperature" of the grain is related to its
vibrational energy. By comparing with an "exact" statistical calculation of the
emission process, we determine the conditions under which the "thermal" and the
"continuous cooling" approximations can be used to calculate the emission
spectrum.
We present results for the infrared emission spectra of PAH grains of various
sizes heated by starlight. We show how the relative strengths of the 6.2, 7.7,
and 11.3um features depend on grain size, starlight spectrum and intensity, and
grain charging conditions. We show results for grains in the "cold neutral
medium", "warm ionized medium", and representative conditions in
photodissociation regions. Our model results are compared to observed ratios of
emission features for reflection nebulae and photodissociation regions, the
Milky Way, normal spiral galaxies, and starburst galaxies.Comment: Submitted to ApJ. 42 pages, 18 figures, Late
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